There is only one reliable way to test the inverter – replacing it with another one and see if the screen lights up after that. Alternatively, you can connect a new backlight lamp and see if your presumably bad inverter lights it up. In most cases I go with the second method – using my test backlight lamp. Because the same backlight lamp will work with many different inverters as long as they have matching connectors. Usually the inverter is mounted inside the display panel below the screen. In most cases you can access it after you remove the display bezel.
The inverter has connectors on both ends. The left side connects to the LCD cable. The right side connects to the backlight lamp which is mounted inside the screen.
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Check out this. To make sure that inverter gets power from the motherboard (via the LCD cable), you can test it with a voltmeter. In my case I connected the “+” lead of the voltmeter to the pin 1 and the “-” lead to the ground trace around the screw hole. I got about 19.4V DC on that side of the board, so it’s getting power from the motherboard. If you accidentally short something on the inverter while testing, you can damage it. Proceed on your own risk! Don’t do that!
So far we know the inverter is getting power from the motherboard, but the screen still has no light. Apparently, it’s either bad inverter or failed backlight lamp. Now let’s test it with a known good backlight lamp. Unplug the screen backlight cable from the right side of the inverter. Connect a known good backlight lamp. Turn on the laptop. If the test backlight turns on, the lamp inside the screen is bad.
In this case you’ll have to replace the screen. Also, you can which is not easy and not recommended. If the test backlight doesn’t turn on, most likely we have inverter failure. Replace it and test the laptop again. There are two different types of backlight connector, you can see them on the picture below. The top one (big) is not as common as the bottom one (small).
I mostly use lamps with a small connector. When you buy a new lamp for test, make sure the connector fits your inverter. On the following picture you see how I’m testing the laptop with a new lamp.
Related articles:.. I love your blog, there’s a lot of tips that i’ve used to repair some laptop, thanks for that.
I have a problem with a laptop, when I turn it on, the screen is very dark, with one very very soft image, at first, I think it was the lcd inverter, I’ve changed it with no success, the screen keeps black, I’ve read your post and followed the steps to test the inverter with another backlight, when I do this nothing happens, the lamp doesn’t turn on, what this could be??, maybe the motherboard isn’t sending power to the inverter to turn on the lamp??please, I need your help. Note: When I plug an external monitor there’s no problem, video is ok. Sorry for my english •.
Hi, Thanks a zillion for this article. I had a dim LCD screen laptop. By following some of the instructions I could zero in on the problem. I tested out the DC part of the inverter board, I was getting around 15V, but I tested the AC section of the board (the other end feeding the backlight) on a multi-meter and I did not get a reading. So i could figure out that the inverter board was the problem. Replaced the inverter board and LCD screen lights up. Gave me a lot of satisfaction, kudos mate great job of writing up the article in a very lucid manner.
chakra, I tested out the DC part of the inverter board, I was getting around 15V That means the inverter is getting power from the motherboard. But I tested the AC section of the board (the other end feeding the backlight) on a multi-meter and I did not get a reading. I don’t think that you can test the AC output with a multimeter, at least it never worked for me.
I tried testing the AC output on a working laptop, just to find out what readings I should expect but as soon as I connect the multimeter, the backlight shuts off. That’s way I suggest testing a faulty laptop with another known good backlight lamp. So i could figure out that the inverter board was the problem. Replaced the inverter board and LCD screen lights up. I’m glad it worked for you.
Israelinkvm, I have a problem with a laptop, when I turn it on, the screen is very dark, with one very very soft image, at first, I think it was the lcd inverter, I’ve changed it with no success, the screen keeps black, I’ve read your post and followed the steps to test the inverter with another backlight, when I do this nothing happens, the lamp doesn’t turn on, what this could be?? If the screen has no backlight and replacing the inverter with backlight lamp doesn’t help, apparently there is a problem with the motherboard.
Also, this problem could be related to the video cable, but it’s not a common failure. If you have the lid close switch – a small button which turns off the light on the screen when you close the display, make sure this button moves freely.
A dirty lid close button might get stuck inside the case and the laptop “thinks” that the display is closed even when it’s open. Bodinator, You can also use a cheap electricians amp-meter that measures induction via the magnetic field to test these. The coil creates a pretty hefty magnetic field.
Yes you can but I believe you’ll get positive readings only if both the backlight lamp and inverter are in a good working condition. The magnetic field will be created only if the inverter is loaded, right? But what if one of the parts is faulty and there is no magnetic field around the inverter? How can you tell if it’s a bad inverter or backlight lamp? I have a Dell Inspiron 1501 laptop where the LCD goes black at apparently random times after being turned on. The computer remains on and apparently continuing whatever functions it was working on, but the monitor is dark. Sometimes it will only stay on for a minute after bootup and other times I can use it for 10-20 minutes before it goes dark.
I am pretty confident its not a battery issue and it shouldn’t be a hibernation or sleep issue, since I am always actively using the computer when this happens. I’ve seen other people on the internet with similar laptop complaints, but I can’t seem to pinpoint a common cause. Could this be a bad LCD inverter? To AJ Simkatu (comment 11), I have a Dell Inspiron 1501 laptop where the LCD goes black at apparently random times after being turned on. The computer remains on and apparently continuing whatever functions it was working on, but the monitor is dark.
If you still can see a very faint image on the screen even though the backlight is off, most likely your problem is related to the screen inverter. If you replae the inverter but the problem is still there, apparenlty it’s a faulty backlight lamp. Sometimes it will only stay on for a minute after bootup and other times I can use it for 10-20 minutes before it goes dark.
Again, sounds like either bad inverter or backlight. If you have to guess, I would try replacing the inverter first.
“”Yes you can but I believe you’ll get positive readings only if both the back light lamp and inverter are in a good working condition. The magnetic field will be created only if the inverter is loaded, right? But what if one of the parts is faulty and there is no magnetic field around the inverter? How can you tell if it’s a bad inverter or back light lamp?”” An inverter takes a (relatively) high amperage low voltage signal and turns it into an extremly high (KV range) low amperage (mA range) signal. There are 4 failure points; CCFL, Inverter, Cable, and Mobo. Couple of things to keep in mind: A: If the CCFL fails it will not load the inverter, so no mag field.
B: If the Cable fails (pretty much it can only fail one way), no voltage = no mag field. C: If the inverter fails, you may or may not get voltage; if the CCFL is loading the inverter and the inverter is not producing enough voltage you’d probably not get a mag field. D: If the mobo fails, no voltage or not enough. Say the unit is DOA and you *THINK* it has a backlight issue, the ampmeter is the 3-second solution to see if you’ve got a functioning inverter. Most laptops go through a power-post procedure similar to a desktop psu and will load the inverter if it passes even if the unit fails to post.
I like the idea of ordering a $15 CCFL and using that to test; I hadn’t thought of that before and come to think of it to test this properly you’d need an assortment of CCFL’s and cable converters. It’d be easy to build a professional soluton from epoxy, wood, 2×3’s, plexiglass, some screws and a label maker. I do keep a spare 12” LCD on hand, as well as a 20” chassis with an inverter hooked into it. You can load a high-end inverter with a low-end LCD ccfl. The problem with either is if you use a 12” LCD CCFL to test a 16” inverter anbd the 16” inverter is ok producing voltage for as 12” ccfl but not a 16” ccfl you wouldn’t know it until you plugged it into the 16” ccfl.
I have an issue with my laptop that I think is connected to the screen inverter. All the white colors (only true white, off white is fine) turns into this pink color with white lines and all the black (True black) turns into this green flashing color. If I move the screen about it some times gets better or worse but sadly my screen case is broken so I have to prop it up against pillows. Is this simply an issue with my screen inverter or with the wires, and is it fixable or not? Can you recommend a good repair shop is Boise, ID that won’t tell me to get a new laptop? Thank you for your time. Nathan P, all the white colors (only true white, off white is fine) turns into this pink color with white lines and all the black (True black) turns into this green flashing color.
If I move the screen about it some times gets better or worse but sadly my screen case is broken so I have to prop it up against pillows. Is this simply an issue with my screen inverter or with the wires, and is it fixable or not? Your problem is not connected to the inverter board. The screen is bright and you can see it, so the inverter works properly. I think it’s either bad video cable or LCD. You said, you can make it better or worse if you move the screen.
I think your problem is connected to the video cable. I would try replacing the cable first. I have a Fujitsu LifeBook C Series computer, and it is having intermittent problems, that I believe to be in the inverter. I’m looking for a opinion from more experienced folks.
Every once in awhile (usually after having been off for a while), the screen will go out, literally. It will freeze the image on the screen and warp it while it goes out. Simply moving the screen on its hinges fixes the problem and puts the LCD right back where it should be – in perfect looking condition. It may take up to 3 or 4 hinge movements before it finally comes back. I’ve never not been able to bring it back. The inverter is located directly under the LCD.
It’s got me beat and I hate that. Any ideas would be appreciated. Daughters laptop she says thinks her brother might have dropped it, no visible damage. Screen very dark. Changed power settings to never turn off screen when on mains. Then changed bios to default. Additional monitor works fine and is cloneing laptop screen.
Gets 15v from motherboard so changed inverter. Next changed backlight. Both backlights have 16k ohms resistance which seems reasonable.
Updated virus definitions and ran full scan. Can’t think of any logical reason why it doesn’t work? Can you help me be a good dad?
my notebook is toshiba L300-P502 got one problem, i cant think about what happen. When i pluged-in ac adapter while the battery full charged. The screen brightness might gone up and down flickers itself. Until i turn off the ac power, the problem gone. What is the problem? If i plug-in ac only sometime it may damn dark and bright dark and bright. The damn dark and bright dark and bright gone if i press Fn+F6 / F7, sometime i on for 4 hour without a problem.
Even the battery installed. Damn notebook just 1 month old, my birthday gift after saving for 2 month to buy it. hello CJ, I have a Toshiba m45 laptop.
The screen has a native resolution of 1280 X 800. When the laptop is powered on, it only displays a 1024 X 768 resolution. This also happens in setup screen also.
The image occupies the top left of the screen with the rest being black. I’ve tried connecting a known working lcd screen with same results. When an external monitor is hooked up it functions with a 1280 X 1024 resolution which is the native resolution of the external monitor. Therefor i presume that the on-board video works. Could this be a bad cable or bad on-board video? Any suggestions would be greatly appreciated.
Hello I have a PCG-K33 vaio that i need to repair, the problem is that when i turn on the laptop i can see the logo of vaio and even if I enter to the bios setup I can see everything as normal, but in the momemnt that windows starts the back light goes off. I tried to reinstall windows but same issue goes off int he middle of the installation. And the video card is working because if i connect the laptop to a monitor I can see everything and If i get closer to the screen i can see the images but really realy dark.
What can i do? Do you think that is the Inverter or the Lamp Light? Thanks for your help •.
This is great info. I’m a PC tech who does a lot of work for a lot of clients (sometimes I think too many). I often left the LCD repair up to guess-work (whether it was the inverter or the LCD itself). For the most part I guessed (or deduced it correctly), but those ones I guessed wrong on were costly and time consuming mistakes I know I could have avoided.
I used to work with a group of technicians who would hoard their knowledge and never share what they knew with other techs. Needless to say nothing got done very well in that shop, I’ve since struck out on my own and have been doing very well. Your little blog was very well written, informative and extremely helpful. I thank you for sharing your knowledge. PaulQ, I would be interested to know how i can test if the inverter is getting the required voltage from the motherboard? I am sure this must be possible but i am inexperienced in testing electronic components.
You can test the incoming voltage with a multimeter. When you take a look at the inverter side oriented to the cable (not LCD backlight), you’ll see a few a few connectors. One of them could be marked pin 1. You’ll have to measure voltage between pin 1 and ground. It could be somewhere between 10-20VDC. Be very careful, do not short the inverter with the voltmeter. cj2600 thanks for responding to my query it looks like i misread the article above as your advice seems to be the same as was mentioned.
I would also be interested to know how to trouble shoot problems with the incoming power i.e. I have seen laptops with faulty dc jacks which i have resoldered and still did not work is it possible to test the board at a given point and determine where the fault may lie or would you need a board schema?? Perhaps this could be a subject for a future article?? Regards Paul •. AL POE, here’s my story on a Dell 1501 the lcd screen won’t apprear until a couple of hand slaps on the left rear of the screen and will then only stay on with slight pressure supplied by my hand on the left bottom corner pulling towards me. This works in any postion of the screen and once the pressure is release it slowly fades to white and other colors. I’m discassing LCD failures in.
I think your failure is similar to the example 7. I would say you have a faulty LCD screen and it has to be replaced. Apparently there is a bad solder joint somewhere on the LCD controller board and when you apply some pressure on the screen you temporarily fix it. I have replaced the lcd and the inverter on a gateway mx8738. I am going to try the multimeter test later this evening to see if the inverter is getting power. My screen now will only show a faint image. I dont have a lid closed switch, but was wondering if this computer has a magnetic switch and if so how would I test it or find it?
I have also changed the lcd cable out but still nothing. When I boot the computer without an inverter connected at all it does the same thing as if it was connected and bad, dim screen.
Any other things I should check before parting out this laptop? waligi, really need help with my compaq MA8. When turned on,nothing appears on the screen and the touchpad lights up only for a few seconds and then goes back off.After that,nothing happens and any key combination given does not even give the usual beeps after. I would test the power adapter. Maybe the adapter is dead and the battery doesn’t have enough power to start the laptop. Check memory modules, make sure they are properly connected to the motherboard. Try reconnecting memory.
Try removing modules one by one and test the laptop with one module at a time. It’s possible that your problem is related to memory.
Jesse, Could the bulb and the inverter board go bad at the same time? I sent the new inverter board back and ordered a new LCD screen. When I put the new screen in it’s still dark!
I’m guessing they were both bad and now I’ve got to reorder the inverter board It’s possible but not very likely. There is a chance that one of the new parts is defective. You didn’t connect them properly.
Try reconnecting parts. If you replaced both but still experiencing the same problem, it could be related to the motherboard.
I cannot tell what is wrong without looking at the laptop. Stefan, The bottom half of my screen is dark and has light spots right at the bottom, whereas the top half works perfectly. I was considering buying a new screen which wud set me back $300 = =” but this site has given me hope, maybe i have a faulty backlight at the bottom. Any advice on what i should do? I believe desktop LCDs have two backlight lamps inside ( I could be wrong).
Apparently one of the backlight lamps in your monitor is bad and has to be replaced. Cannot help you with that. I work only with laptops. I have a Dell Inspiron E1705 with an WXUGA+ display. I accidently closed the laptop screen cover when a pen was still sitting on the keyboard. Since then, about 1/3 of the screen (on the left side) is dimmed. It never gets really dark, but it’s definitely dimmer (and harder to see) than the rest of the screen, which looks normal.
The transition in brightness is gradual – there’s not a clear “line” separating dim from normal. The image is otherwise fine – just dim in that left section of the screen. Is it a inventor problem? Or backlight problem?
Or do I need to get a new lcd screen to fix it? Hi,love this,it is so informative! I’m having a similar problem,but not quite the same as what I’ve been reading & I hope you can help me. I have a Dell Inspiron l6400 laptop.
Nothing has happened to it, one day I turned it on & the bottom 1/3 of the screen has gone white/gray. There still seems to be light, but can’t see anything. When it 1st started,I could tap the bottom of the laptop it would come back on, but nothing brings it back now. I took things apart to check for loose connection to lcd panel. Everything seems ok,no visible damage or anything. Checked the connection,unplugged & plugged the cable back in where it connects by the power button – nothing!
Hooked it up to another monitor & dispaly on that monitor is fine. Does that mean I need to replace the entire LCD, or could it be a bad cable or something else? I don’t want to spend a lot of $ to replace something & have it still not work!
I appreciate any advice/help you can give me. Hi, Great site! I have an IBM T30 and came home one day to the screen being dark. It lights up during reboot, logs on to windows and goes black again. I don’t see any faint image, but maybe I need to look harder with a flashlight.
The unit has a docking station. I setup an external CRT on the docking station and it works fine. Device manager says everything is fine. The properties tab for display shows two screens inclduing the CRT and LCD. It says the LCD is “not active” if I recall right. I’m wondering if this is a problem with the inverter? The docking station probably has a card in it that is operating the CRT?
Also, before ordering an inverter, I can’t determine which one it is. There are two different part numbers out there for my model and I don’t really want to take the laptop apart twice, once to find the number and one to install the part when I get my hands on one. I went to numerous sites, but they just identify with the T30 verus the full model which is a T30 236697U.
The two part numbers I am finding out there are: 26P8412 (150nit LCD) and 26P8411 (200nit LCD. What are the nits? I have gone to the Lenovo / IBM site.
It only lists an inverter / screen combo pack number for certain models and does not even list this model number. Tony, I have an IBM T30 and came home one day to the screen being dark. It lights up during reboot, logs on to windows and goes black again. I don’t see any faint image, but maybe I need to look harder with a flashlight. Instead of rebooting the laptop, try tapping on the lid close switch – a small button by the hinge. Can you light up the screen when tapping on the switch? On some IBM laptop it’s really hard to see anything on the screen when the backlight is off, so look very closely.
Your descriptions sounds like a problem with the inverter or backlight lamp. Try replacing the inverter board first, they are not expensive. Also, before ordering an inverter, I can’t determine which one it is. I would find the FRU part number on the existing inverter and use it for buying a new one.
It’s not difficult to removed the bezel, takes only 5 minutes. You don’t have to disassemble the entire display, simply lift up the lower part of the bezel, find the inverter part number and put it back together. Great site! I have a related problem with my 5 year old dell latitude d810. The screen is now dark and the image on the screen is barely visible but still working.
Everything else works fine. Shortly before this problem, the screen started to flash when I opened windows or was slightly pink. Your site (and others) seems to indicate that this may be the inverter or the back light of the lcd.
I have looked at your other post on the backlight, but does the way the problem occurred tell me something informative about its cause? I was given a laptop to check out since the monitor was not working. A month ago I concluded the monitor was just shot and needed to be replaced as I was able to get video to an external monitor but got no image on the LCD at all. TodayI decided to break it out again to use with an external monitor. But this time I noticed if I pulled the monitor from the top forward (i.e. I pull it as I might close the laptop, But only pull enough until I lose the “slack”) I was able to see the monitor display without the back light.
Once I let go, the image disappears. Then if it’s played around with in some other random fashion, I can get the display and back light to work.
I am wrong to assume that I may just have a wire problem and not an inverter or backlight issue? I took the laptop apart, but I just couldn’t figure out how to get the monitor off so I could take the bevel off it. Laptop is a Toshiba A205-S5871. Tamal, My notebook Samsung R50 has its some left portion of it more darker than the rest of the LCD screen. And overall I have also noticed that my 3 year old this notebook of mine had its overall brightness reduced. My question is: is it the CCFL needs to be replaced or is it the inverter gone bad? It’s hard to tell without testing the laptop with known good spare parts, but I think this is related to the CCFL.
From my experience, when inverter fails the entire screen goes dark. The inverter either works and provides power to the backlight lamp, or doesn’t work and the backlight gets no power at all. I think the backlight lamp goes bad.
I have an Acer Aspire 1710 which has gone Black Screen completely, can see no image on screen. All sounds and processes at startup seem OK activity HDD etc and startup, havent tried it on an external monitor but all keyboard Fn F5 ext to switch to int ext monitor have no effect. Also strangely on startup seems to be different the WiFi light sometimes not lighting so altho booting has a difference. Have checked manual and trouble shoot but to no avail. Beginning to think inverter or lamp but would screen show something? Currently bank/black.
Werd thing is only yesterday (when it was OK) I had been discussing inverters with a mate who’s Tosh had failed. Weird any help guys?
Thanks Steve •. Hi, my wife’s Gateway T-1625 laptop LCD is acting up. I’ve replaced it once already because my kids managed to crack it. It worked fine for about 2 months but now it’s beginning to flicker and twitch (I don’t know if that’s the right term for it haha!) There are horizontal lines at the bottom and top of the LCD that prevent you from seeing what’s behind them. Sometimes the screen dims and then gradually gets bright again. It repeats this sometimes.
It seems to be slowly getting worse by the week. I’ve tested it with an external LCD monitor and everything works fine that way. Do you think I just got a cheap LCD that’s going faulty already? I’ve read your article, which is great btw, and I don’t think it’s an inverter problem since the laptop is still usable other than its annoying. Any help would be appreciated. Thanks and keep up the great work! A customer left a Dell Inspiron 1520 for a replacement LCD.
She told me that she had dropped the computer and the screen in it was shattered. I received a replacement screen, and installed it, but the screen is very dim. The backlight IS working, but appears to be at the lowest possible setting. The function up/down buttons come up on the diplay when pressed, but I still have the exact same brightness whether this is set all the way up or down. I have flashed the BIOS to the latest version, checked the BIOS settings and the screen settings are turned all the way up. Even put them at the halfway point to see if that would allow the screen to change in brightness with the funtion keys. It is still the same no matter what settings I change.
I am leaning towards a bad inverter, but most of the inverters I have seen in the past are either bad or good, not in between such as this one. This computer has an offboard video card, Nvidia GeForce 8400 M. Could this card or something with the motherboard be causing this? One last thing worth mentioning, is it makes no difference if using battery, or AC power. Thank you for any help or suggestions that you might have. Will repost if I find a solution.
I tested the screen on a Toshiba that uses the same model screen, and there are no problems, so this IS a good screen. Also, and I find this interesting.
The screen from the Toshiba DOES NOT work in the Dell. The screen out of the Toshiba is a 154EW08, the original and replacement from the Dell are both 154EW02’s. These screens seem interchangeable in the Toshiba, but not the Dell. I will order a known good inverter today as I would like to keep one in stock for test purposes anyway. Will let everyone know how this turns out.
My three-year-old HP Pavilion DV6275US (RP284UA) shows distorted colors (not pinkish hue) on the Windows screen while booting up, keeps on flickering till the desktop comes up and soon after, with a series of horizontal black bands that go from bottom to top, widening all the time, goes blank. No image is visible after that, even with a flashlight. Moving the dislay panel back and forth does not make any difference. I hooked it to an external monitor and ran for hours without a hitch.
That seems to exonerate the video card (NVidia GeForce Go 7400, integrated to the mobo). Looks like there could be three culprits 1) the inverter 2) the CCFL lamp 3) the LCD cable (an outside chance) or a combination of two or all of them!
A local repair company of repute suggested replacement of the LCD screen that would set me back by Euro 195. I have read your articles with great interest and I think I can handle replacement of the the parts. Unfortunately, I have no way to test the unit with known good spares. Could you diagnose what is wrong and what I should order as replacement? Any help, comment, suggestions, posted on this page, would be appreciated.
Subrata, Looks like the video card is working properly, I agree with that. Bad inverter board? I don’t think so. When inverter goes bad, you still should see a very fain image on the screen. From your description is sounds like you have no image at all, so it’s not related to the inverter board. Bad backlight lamp?
I don’t think so. There is no image on laptop screen at all, so it’s not related to the backlight either. I think it’s either bad LCD screen (most likely) or faulty video cable (less likely). Before you replace anything, try reconnecting the video cable connector on the motherboard.
It’s located under the keyboard cover, close to the right hinge. Maybe the video cable is not making good connection with the motherboard. A local repair company of repute suggested replacement of the LCD screen that would set me back by Euro 195. You can buy a brand new LCD screen on eBay for less than $80 and replace it yourself. Henry, A customer left a Dell Inspiron 1520 for a replacement LCD. She told me that she had dropped the computer and the screen in it was shattered.
I received a replacement screen, and installed it, but the screen is very dim. The backlight IS working, but appears to be at the lowest possible setting. The function up/down buttons come up on the diplay when pressed, but I still have the exact same brightness whether this is set all the way up or down. Go to the device manager and uninstall display adapters.
Restart the laptop and let it redetect the adapter (and LCD screen). Doing that might fix the problem. I am leaning towards a bad inverter, but most of the inverters I have seen in the past are either bad or good, not in between such as this one.
From my experience (and I replaced hundreds of them), the inverter either work or not. I really doubt that your problem is related to the inverter board.
Lay V, There are horizontal lines at the bottom and top of the LCD that prevent you from seeing what’s behind them. Sometimes the screen dims and then gradually gets bright again.
It repeats this sometimes. It seems to be slowly getting worse by the week. I’ve tested it with an external LCD monitor and everything works fine that way. Do you think I just got a cheap LCD that’s going faulty already? I’ve read your article, which is great btw, and I don’t think it’s an inverter problem since the laptop is still usable other than its annoying. I don’t think this is problem with the inverter board. A faulty inverter board cannot cause lines on the screen.
I think you have a faulty LCD screen (most likely) or there is a problem with the video cable (less likely). Just in case, try reconnecting the video cable on both ends, on the motherboard and back of the LCD screen. Make sure both connectors are plugged correctly and secure. If reconnecting the cable doesn’t help, I guess you’ll have to replace the screen again. Steve Midwinter, I have an Acer Aspire 1710 which has gone Black Screen completely, can see no image on screen. All sounds and processes at startup seem OK activity HDD etc and startup, havent tried it on an external monitor but all keyboard Fn F5 ext to switch to int ext monitor have no effect. Also strangely on startup seems to be different the WiFi light sometimes not lighting so altho booting has a difference.
Have checked manual and trouble shoot but to no avail. Beginning to think inverter or lamp but would screen show something?
Currently bank/black. If the screen is BLACK and BLANK, the problem is not related to the inverter or backlight lamp. With failed inverter or backlight you still should see a very faint image on the screen. I would definitely test the laptop with an external monitor. If external video works fine but nothing appears on the screen, it’s possible you have a failed video cable OR the cable got disconnected from the motherboard. Try reconnecting the cable. Replace the cable.
If both, the internal and external screens do not work, it’s possible that you have a faulty memory module. Again, test the laptop with the external monitor before jumping to any conclusion. Looks like the video card is working properly, I agree with that. Bad inverter board? I don’t think so. When inverter goes bad, you still should see a very fain image on the screen.
From your description is sounds like you have no image at all, so it’s not related to the inverter board. Bad backlight lamp? I don’t think so. There is no image on laptop screen at all, so it’s not related to the backlight either. I think it’s either bad LCD screen (most likely) or faulty video cable (less likely). Before you replace anything, try reconnecting the video cable connector on the motherboard.
It’s located under the keyboard cover, close to the right hinge. Maybe the video cable is not making good connection with the motherboard.
Thanks for your well-thought opinion. Last weekend I dismantled the LCD screen, thanks to your and another website’s step-by-step guide and took out the CCFL bulb. I re-assembled the laptop and left the bezel cover out so as to be able to reach the inverter at will. After making sure that the computer is otherwise functioning normally and I did not mess it up in the process, I connected the CCFL bulb. It lit up immediately, but started making a metallic repeating sound like a key emits when it gets accidentally pressed and remains depressed for a while. After a while the light went off. I kept the computer that way (front bezel removed) and tried the CCFl again just now.
It did not light up. Incidentally, I noticed a very dim display on the screen while booting up the first time after removing the CCFL. I am not sure whether subsequent boots were also displaying the dimmed screen or the screen was entirely black. Please advise what you think from this development. I think I messed up my last post by trying to add your response to my original post.
So here it goes again. I have taken out the CCFL light from the display panel, reassembled the laptop and tested the light. The CCFL lit up but started emitting a metallic sound and after a while went off. I tried it later again (the laptop is working with an external monitor and I left the front bezel out to have access to the inverter at will) and found that the CCFL did not light up nor was there any sound.
Could you tell me what I should replace? The video cable has been unplugged from the system board and re-seated without any difference in the display; it remains blank. BTW, the first time I booted up the computer with the CCFL outside, a very dim screen appeared but not on subsequent boots.
Please advise. Dell inspiron 1000 screen blacks out when (even slightly) adjusting position of screen towards close or open. The HD LED and power LED stay lit. No HD spin or fan. 3-finger salute does nothing.
Can only do hard shut down and power up to revive. I have no problem if I just touch or squeeze the display; only problem when pivoting on hinges or when shaking the desk enough to adjust the display’s position. If it’s open at 90 degrees, for example, and I then open it to 91 degrees or close it to 89 degrees, display and fan shut off.
As if sleeping. I exposed the hinges and made sure the sleep switch is not being triggered.
Could it be a short in the cable running from the system board to the display? If so, where to get it and how to replace? I’d appreciate any thoughts before I send it to Dell hell (recycling center)? I had a Dell XPS 1210 for repair presenting following symptoms: when booting i could see the DELL logo but after the screen turn pitch black. After i’ve tried the laptop on an external monitor and the image was good, i opened the screen and tested the backlight(with an replacement inverter). It wasn’t working. I changed the backlight, it was working but ONLY WITH THE BATTERY.
When i was pluging the AC ADAPTER i was getting the same dim pitch black screenso i reached the conclusion that the inverter was badreplaced the inverter also and everything was working fine. Any ideea why the inverter was working only with battery and not with AC Adapter? please write me back. My fiance just sent me this laptop from japan and the box was damaged and now i turn it on and it goes black BUT i just realized along with this website that if i push on the part of the screen where you show the screen invertor is, i can get the screen to flicker and dim back on. One side is bright and the other is dark is it posible that this damage is done due to shipping? It wasnt wrapped or really protected.
I cant believe the postal service didnt do anything to protect it. Im going to take it in to be fixed, now that i know what is wrong and can help them out. I dont know much about computers, but i know how to figure it out and what to do. But i wont do it myself.
I dont want to ruin it even more but please write me back! my toshiba laptop problems: 1) once the ac adapter was plugged in, the laptop screen was frozen with horizontal lines.
Cant move, cant shut down, no response to alt crtl del. But, if only use the battery without ac adapter, the laptop wil operate normally. However, the battery only can use for 1 half hours.
Therefore, i hv to plug in the ac adapter. Once plugged the screen was frozen with horizontal lines. Cant move, cant shut down, no response to alt crtl del. Wat’s wrong with my toshiba laptop? I replaced a perfectly working, albeit cracked screen, with what I was told was a compatible replacement – the new screen does work but is stuck at about 40-50% brightness and will not change via hotkeys, hardware, software or bios settings.
It has 2 settings now and only toggles irratically between them instead of the proper 8 levels. I even transferred the new screen to my original backlight with no change – could the screen have damaged my inverter?
It was working fine with the cracked screen so I’m a bit baffled. When just the backlight is plugged in, can it’s brightness levels be controlled via hotkeys? My hp hdx16 1060es screen has gone to black few days before. Then i move the screen upwards and downwards, its come back. Daily i get my screen on with this manner.
But last two days before, i played the game “assassin creed” but next time when i powered on the laptop, my screen was totally black. I also tried many times to remove the battery and pushed the power button for a while, but now this trick is also not working for me. External monitor is working well. Please suggest me whats the problem with laptop’s screen.
My Toshiba P205_S6287 was knocked off a table. It is still working however the 9″ plastic hinge attaching the top (lid) and bottom (base)broke on one side.
The wires that go through that part are being pinched as small area of solid pixels appear on the display until I move the lid to a different position. I can’t determine which parts I’d need to fix the problem assuming it’s repairable. I’m concerned about further damaging the display wires opening and closing the lid. Parts suppliers are also unsure as one said I needed a LCD cover assembly but another thought I needed a base assembly. Your photos are most helpful and explanations clear but I’m stumped on this one. There’s a diagnostic test at startup on my laptop that tells you if the inverter and backlight are working fine. My backlight is out completely doesn’t come on at all but under a bright light i can see mostly it’s just faint.
I come across the test by accident i went to start in safe mode but clicked f12 instead and got a choice to do a diagnostics test so did it and it tested everything on the laptop including an heading for the LCD and the tests for it were inverter it passed, backlight passed and graphics passed. In fact nothig failed at all it took about an hour to check everything. The light went out without warning never did it before just went out and hasn’t come back on! Hello, I have an Acer Aspire 5516.
The screen was broken when we received the laptop, but we did not realize that was the problem until it was returned to the Acer repair center and the tech called to tell us it was not a covered item. I have since replaced the lcd screen following your excellent directions. When I turned on the Laptop, it came on great, screen looked good.
Yea.maybe 10 seconds, the screen dims out. Now I did some testing and it is NOT as dark as if the backlight is out. The screen is now the correct brightness, however if I move the mouse, it dims. I do not know how long it takes for the screen to brighten up, as I have not seen it brighten, I just look and it is OKThis occurs on battery or outlet. I am going to take the backlight out of the old cracked lcd screen, how do I go about that?
Thanks again •. Hello, I am having similar problem but with a little detail. I get the very dull image on the screen only when my laptop (DELL Inspiron 6000) is cold. After running under this condition about 20 minutes and several restarts it begins showing the normal bright picture with NO problems after. Initially I thought that it might be either inverter or back light. Yesterday I replaced the inverter with no results. I am ready to replace the CCFL but now I am thinking that the problem could be something else.
If it’s a backlight problem then why it is working right now without any failures even when I restart laptop (because it’s warm). If it’s a connection, wire or soldering problem then it should failure from time to time during the work when i bend the screen and even touch the wires. Does anybody have similar experience?
Please give me a piece of advise! I would really appreciate this because I do not want to go through the CCFL replacing procedure if I am not sure that this is the case. I have a Dell XPS Inspiron LaptopI have similar problem on my screen like some of the others here. The screen went black 6 months ago but, sometimes booth normally and then a few seconds laterthe screen with go black again. I can see very faint image. Through research and reading your adviceit sounds like a bad inverter. I replaced the inverter and it works for 9 hours straightthe next day when I boot the laptopit’s black again.
I can use the laptop using an external monitorso I know my video card is good. Any ideas/suggestion? This site is very informativeThank you so much in advance. Gerry, The screen went black 6 months ago but, sometimes booth normally and then a few seconds laterthe screen with go black again.
I can see very faint image. Through research and reading your adviceit sounds like a bad inverter. I replaced the inverter and it works for 9 hours straightthe next day when I boot the laptopit’s black again.
I can use the laptop using an external monitorso I know my video card is good. Any ideas/suggestion? Maybe you purchased a defective inverter? Did you buy it from a reputable seller? I would try replacing it again just in case. It worked for 9 hours, didn’t it?
cj2600, Thank you for your reply. Here is the second part of my story. I got the new CCFL for replacement.
I connected it to inverter and found it working when the original one did not. Being sure that the lamp was the problem I replaced it with the new one on my DELL Inspiron 6000. When I assembled everything back and turned the notebook on I saw the familiar dull image. The first thing in my ming was that I damaged the back light during the installation. I disassembled everything back and suddenly it started working again. I tried to find the problem and bended slightly the screen and rechecked all the connection. Sometimes during those tests the lamp did not glow but i could not find the problem.
I put everything back and now the laptop is working normally but already I had one situation when I had to restart the computer because of the dull image. I have no idea what to blame. It could be a electrical board on the screen, it could be the screen cable.
I do not know what to do to be sure. I do not want to buy the new screen thinking that it might be cable. Could anybody give me piece of advise please? I would like to know what I can do because the computer that I bought is having a failure, in LCD screen. When I start the computer the screen begins to sweep from the bottom to the top, this happens for about 3 minutes, and after that time (about) it gets still and looks normal, although on the bottom of the screen a single line of pixels continuous flickering and changing of color (rose, purple, blue). Sometimes also after a while or when starting a new program the failure starts again.
I updated the Nvdia drivers, tried to change the screen resolution, but nothing changed. I tested the computer with an external LCD and the problem disapeared. I need to find a solution because it seems to get worse. Yours sincerely.
*Product Type: Notebook *Product Model: X83Vm *Place of Purchase: USA *Date of Purchase: 2009/1/1 •. I replaced my Toshiba Satellite L305’s broken screen with a friend’s Toshiba screen. His inverter wasn’t working so I used mine (well, the same type as mine, my original inverter broke so I ordered one online). The screen back light would stop working randomly or anytime there’s a drastic resolution change, like when I hook it up to my television and unhook it or closing the lid then reopening it. I would open the lid and the screen would flash on for a second then the back light would turn off again. Also when ever the brightness goes down to a certain level, the inverter a loud noise. Is the problem the compatibility with the screen and the inverter?
Hi, i was looking for a advise because i made a mistake by fixing a cable between the inverter and the motherboard. I changed two of the four small cables. After i started up i stopped the laptop as soon as i can. But i think the damaged was already done. My question is, is only the inverter broken or is there a wider communication between the inverter and the motherboard so that a part of my motherboard is broken. Is starts whithout the inverter but not startup sound. Lights are up and a spinning cooler and harddrive.
Further no dark movement on the screen. Thank you for reading.
Greetings from Holland. I have a Toshiba Satellite M55-S135. I found information that led me to believe I was having a problem with my backlight inverter.
On startup the picture would flicker for a few seconds then go out. I ordered a backlight inverter for my laptop and it did not illuminate the screen. The old one did but continued to go out. I got another one and installed it. The backlight now seems to illuminate the screen but no images come up.
I can here the computer starting up and the sound of the windows screen sounds but nothing shows up on screen. Now when I tried reinstalling the old inverter it does the same thing as the new one. Any suggestions? Erick Clavijo, I have a Dell Latitude X1 with the described problem.
Screen comes on. Eventually goes very dim but screen is still visible. Works fine with external monitor. When I removed the bezel I saw that the inverter board had a burned out circular mark on the board itself and you could smell it. Seems like the inverter board could be my culprit but I’m wondering if the same thing will happen to the replacement inverter? Yep, sounds like the inverter board failure.
Will it happen again if you replace the inverter? I don’t know. Try replacing the inverter board. Omarey, I have a Toshiba Satellite M55-S135. I found information that led me to believe I was having a problem with my backlight inverter. On startup the picture would flicker for a few seconds then go out. I ordered a backlight inverter for my laptop and it did not illuminate the screen.
The old one did but continued to go out. I got another one and installed it. The backlight now seems to illuminate the screen but no images come up. I can here the computer starting up and the sound of the windows screen sounds but nothing shows up on screen. Now when I tried reinstalling the old inverter it does the same thing as the new one.
Any suggestions? I think you should check connection between the cable and LCD screen/motherboard. Try reconnecting the cable on both ends. It’s possible you accidentally disconnected the cable from the LCD screen (or motherboard) while replacing the inverter board. Check connection between the cable and LCD screen first, it’s on the back side of the screen. Sharma, I have a slightly different problem in my Dell laptop.
My screen back-light is working properly when running on a battery. But when i attach mains with that, lights turns off but i can still see display in a bright light area. So i need to charge laptop and detach power adapter before using it, that is very annoying. I’ve seen some people complaining about the same problem before but I don’t know the solution. Enter the BIOS setup menu and find the LCD screen brightness settings.
Reduce the screen brights for AC mode and test your laptop with AC adapter again. Does it help? Hi, great posting.
I have a toshiba laptop w/ ati radion 3100 card installed. Its lcd is 15.4″ wxga and manufactured by LG. I have a spare wsxga+ 15.4″ lcd screen pulled from a thinkpad t61, and is manufactured by samsung. I tried to install samsung lcd to my toshiba, but the screen would not light up.
I switched back to the LG and it works fine. What would be the problem? Does the samsung lcd needs different inverter? Or vga cable needs to be replaced. I checked the video cable and it fits. Tester, I have a toshiba A135. Everything works except that the LCD is mostly a green hue.
I replaced the converter and still same prob. Did you mean the inverter board? You were wrong, a green hue on the screen cannot be caused by the inverter failure. Only the LCD screen backlight could be affected by the inverter failure.
Then I purchased a broken A135 for parts and replaced the entire LCD screen and it is still doing the same thing. Output from the VGA connector is fine.
Did you replace just the LCD screen or you replaced LCD and video cable? I have to assume the problem is with something on the motherboard? If you replaced the LCD screen and video cable, then you are correct.
Most likely this is the motherboard failure. I just replaced a bad ccfl in my laptop. It went well. Next problem- when I turn it on with the lcd unplugged the whole screen lights up white but when i plug the lcd in and turn it on everything stays black.
Is this a common symptom of a bad inverter? I don’t know if this helps but when I opened up the lcd the old ccfl was in two pieces and all black where the pieces met.
The area over the inverter was getting really really hot. That makes me think that the inverter got too hot and broke the light.
Any ideas on where the problem might lie? kapil, I have LCD goes black problem with my Sony Vaio FZ11S, already tested inverter it is working fine. I suspect strongly it has CCFL backlight got faulty.
But here my question is, this 15.4 WXGA LCD screen has twin CCFL bulb so in case one CCFL bulb goes faulty other one should work Right? In that case I should get atleast some light on the screen? I don’t have a lot of experience with dual lamp screens, but it’s possible the dual inverter board works properly only when it’s loaded by two working backlight lamps, not just one lamp. Thus if one backlight lamp fails, the inverter board doesn’t get enough load and shuts off. Consequently the remaining working backlight lamp also stops working.
This is my guess. If you absolutely sure the inverter board is good, I guess you’ll have to replace the screen. Is it possible that both CCFL goes faulty at same time? I think it’s possible but very unlikely. Just installed a brand new screen in my Sony Vaio pcg-8v1l.
I have installed dozens of screens over the years and had no issues. On this install, it all went fine until I booted up. On boot the Windows Logo and Login Buttons are all set to the right. When logged in, the Start bar across the bottom is about 2 inches below the lip on the display. In other words, I can not see it. I can paly around with the mouse and get to the bottom and start it, but when it pops up, I can only see the top half of the pop up menu. Can’t get to programs, control panel nothing.
Not sure what to do here. I checked all of the drives and they are up to date. I ran the Nvidia wizard and it is all correct. Changing screen resolution does not help either.
All I did was replace the screen, nothing else. Could it be the Screen Inverter? Hello, I got Toshiba satellite_A215-S7413. All I got to see is its battery consumption is really heavy. This ages battery earlier.
The culprits are 1) Processor 2) Wireless Card 3) CCFL Backlite. I Working on processor means making bios upgrade for processor. Then finding low power equivalent for existing. The processor needs to match even the existing connector slot. Wireless card: for the moment very little can be done about this too. So I concentrated on Backlite which consumes nearly 11-12W ( I have seen some lappis need only 14W for complete function).I am thinking of replacing CCFL with LED and design the necessary control circuit for this. But my current obstacle is I dont know the protocol of communication with inverter card for brightness control and Pin configuration on inverter connector.
Is anybody here aware where will I find it? I hope u could help me. The problem is I have a thin blue line at the center(vertical) of the laptop’s screen. And beside the line(left) is about 1.5 to 2 inches of discoloration running vertically.
It’s a bit brown and yellow of color. If a black text is under that discoloration it turns blue. The problem is visible from the moment I turn on the laptop but it does not appear when I connect another lcd monitor. Could u please help me?
Oh and by the way how do I remove the inverter do i just pull the 2 cables out? I find it very tough to pull the one connected to the CCFL I’m afraid I might snap the connecting cables out. PLEASE, can you tell me your opinion. In case I have all the symptoms of the backlight or inverter not functioning.but when I turn laptop on/asus a6r/the screen is dim, I see the outline of the picture, but in windows.I am able to use fn+f7/lcd on/ key.and the lcd screen turns on.for a second or two.fully bright.then turns immediately off. So based on that.I can assume that backlight is ok, and inverter is ok as well? Since the displays always comes on.when pressed fn+lcd on, but then lcd turns automatically off. Now here is the tricky part.
When I tried to fiddle with brightness, I found out that if I drop the brightness all the way down, the lcd is able to stay on.and on.for long long time.but then when I turn brightness up a bit, it turns off.as if it was not able to sustain/support with enough power the lcd brightness.so it goes dim. Any chance you ve experienced it.or know what the problem is, Please?
Maros, I have all the symptoms of the backlight or inverter not functioning.but when I turn laptop on/asus a6r/the screen is dim, I see the outline of the picture, but in windows.I am able to use fn+f7/lcd on/ key.and the lcd screen turns on.for a second or two.fully bright.then turns immediately off. So based on that.I can assume that backlight is ok, and inverter is ok as well? Is it for switching video between internal and external monitors? If the screen light turns on for a while after you press Fn+F7, it confirms that most likely you have either bad inverter of failed LCD screen. Which one is failing?
Cannot tell without installing known good inverter OR backlight lamp. Now here is the tricky part. When I tried to fiddle with brightness, I found out that if I drop the brightness all the way down, the lcd is able to stay on.and on.for long long time.but then when I turn brightness up a bit, it turns off.as if it was not able to sustain/support with enough power the lcd brightness.so it goes dim. Again, this confirms the inverter board or backlight lamp failure. When you drop the brightness, you actually reduce voltage going from the inverter board to the backlight lamp and because of the the LCD screen brightness goes down.
And again, I cannot tell which one is failing. It’s possible the inverter board can work properly only when it’s not loaded by the backlight lamp. Or The backlight lamp can stay on only when the incoming voltage is low. It’s not possible to troubleshoot backlight/inverter failure without test equipment. If you don’t have another known good inverter or spare backlight lamp, you’ll have to guess. I would try replacing the inverter board first.
Thanks for this article. Replacing a failed (cracked) LCD, and after checking that it worked well we began assembling. On subsequent power up we found that the backup lamp was not working. New inverter did not fix and I was ready to order a new screen (or back lamp).
Your article on inverters assisted me in troubleshooting down to a lack of 19v power to the inverter, so my assumption was a motherboard issue likely caused by inattention to detail and a subsequent short during the repair. With nothing to lose I placed a jumper wire from another 19v source to the inverter input and all works well now. Thanks for the article and hope the donation helps to keep you going. Is there a more direct route to your information as I found this article by accident. Thanks again Rich •. I got some problem with my laptop lcd screen and not sure whether the problem occur related to the lcd inverter.
My problem is that my screen start to shaking for a couple of minute after i turn on my laptop. Then the display no shaking anymore but the display start to blink and creating a blur image resulting a mirror image like it shifting the blur image downward. This blinking image on my screen happen all the time and it only going back to normal for a couple of second. Any suggestion or help about the problem?thanks. Hello, Just wondering if anyone could point me in the right direction w/ a problem I’m having. The bottom 3rd of my LCD stopped working completely (wasn’t getting any light etc), so I just purchased and installed a replacement. Upon power up I can see that the backlight is working (the screen is lit up), but the entire screen remains black throughout startup and never changes.
I know the computer is working because I can hear the sounds from Window’s starting up etc. Is this a problem with the inverter then? Any information would be greatly appreciated; thanks! Mike, The bottom 3rd of my LCD stopped working completely (wasn’t getting any light etc) This part sounds like the LCD screen failure.
So I just purchased and installed a replacement. Upon power up I can see that the backlight is working (the screen is lit up), but the entire screen remains black throughout startup and never changes. Most likely it’s either not compatible OR defective LCD screen. Make sure you are using the right screen. Is this a problem with the inverter then? No, it’s not the inverter.
You get backlight on the new screen, so the inverter board works properly. Mike, The screens are the same in that they’re the same size, resolution, and they’re both WXGA. They are different in that the new one is the more “shiny” screen that you usually see today, whereas the original was the more dull type that was around more often when I bought the laptop (approximately 5 years ago). Would that make a difference or is it more likely that the new screen is simply defective? Apparently, the new screen is Glossy and the old one was Matte. If both screens are identical, it shouldn’t make a difference.
I cannot tell if your new screen is compatible. How did you find the screen?
By the way, didn’t you check connection between the LCD cable and new screen. It’s possible the cable not seated correctly and because of that you have no image. Try reseating the cable. I just found the screen by searching for Inspiron 6000 screen on Ebay, then made sure it matched up in terms of size, resolution, and WXGA. And of course the listing said it was compatible with my model.
Is there anything else that has to be the same? I will try reseating the cablesit was very difficult to get the video cable inserted at first. I realized after a few minutes that while the actual connection was the same, the new screen was not set up for a connector that had the little locking hinges on the sides, and once I took those off it slid in fairly easily. Anyway again thanks for the help; if I don’t get a picture after reconnecting the cables I guess I’ll try to get an exchange. Hey, So I have a similar story to what a bunch of people have posted here. Star Wars Battlefront 2 Psp Iso Torrent Download. My screen is extremely dark (basically can’t see a thing) but for some reason my VGA to my external is working so that’s what I’m currently working off of.
When I start the laptop up, I can see everything, even up until I log in. While the computer is loading all my programs, or maybe a bit longer, after a few minutes, the screen goes completely dark. If I put it to standby or hibernate and reactivate, the screen will reappear but will turn off in 3-10 minutes. Also, before this problem, I had opened my laptop off to clean out the fan with a compressed gas duster. After I put my laptop back together, this problem started to happen. Let me know what you think.
@ c0dehunter, I already bought a new one and THIS ONE is the new one I also bought a new CCFL and connected it to inverter but It doesn’t lit up. So I was guessing it must be something with cable coming from motherboard, right? When you test your laptop with new inverter and CCFL lamp, make sure the video cable still plugged into the LCD screen.
On some laptop models the backlight will light up ONLY when you have video cable plugged into the screen. I guess it needs some kind of feedback from the screen. I don’t know if this is required for your laptop but do it just in case. If the backlight still doesn’t work even with new inverter and CCFL lamp, most likely you are correct. It’s either bad cable or something wrong with the motherboard. That’s why I wanted to test Inverter to see if it gets electricity. I guess just test both pins.
I don’t think you’ll burn anything this way. @ Shaun, I have a issue that I’m just lost on. All of a sudden, my screen went dark. I could still faintly see the image, so I know the system was still booting up.
Where I’m lost is the fact that when running on battery, the screen is perfectly fine. When it’s plugged in, it’s dark. Does this mean the inverter is going bad or is there another issue with my laptop? It’s hard to tell what is causing the problem without testing the laptop with another known good inverter board or backlight lamp.
This could be either bad inverter or faulty backlight. Most likely the laptop works fine with battery because you have lower brightness settings for the battery mode and inverter/backlight can handle this mode. I got this black scren problem. Everytime I power on my computer, the backlight works for few seconds. Then, the screen starts making a crazy noise and the light turns off. I can still see my desktop icons under a very big light.
After all Ive red about the subhect, I still cant figure if its an inverter, backlight, lcd or video cable problem. I already ordered a new inverter on eBay, which I should receive shortly. But if it doesnt work, I wonder which new part I should get first (10$ video cable, 20$ backlight, 100$ lcd screen) Thanks for answering •. @ Jean-Philippe, Everytime I power on my computer, the backlight works for few seconds. Then, the screen starts making a crazy noise and the light turns off. I can still see my desktop icons under a very big light.
After all Ive red about the subhect, I still cant figure if its an inverter, backlight, lcd or video cable problem. I don’t think this is video cable related problem. Don’t order the video cable. Most likely it’s either bad inverter or failed backlight lamp. Hopefully your new inverter will fix the problem. If not, you can try replacing the backlight lamp or just replace the whole LCD screen. It’s possible to replace just the backlight lamp but it’s not easy.
Take a look at this guide. If it looks difficult, replace the screen. @ Kevin, I thought I had a bad inverter on my 6 year old dell Inspiron b130. So I ordered a new one and after replacing the old one my screen was working again and for a few hours that I worked on laptop, it was just great.
As I shut the laptop (just folded shut) as I always do, next morning I had black screen again. Any wisdom and or advice would be greatly appreciated. Does it go to sleep mode when you close the lid?
Unplug the AC adapter and remove the battery. Now try turning it on normally. Does it have backlight now? I’m having video problems with a Packard Bell Argo C2. There is a faint image on the screen. I replaced the inverter and there is still faint image.
I tested to see if the inverter was getting power and it was. I tried another inverter and I get the same dark image. I tried a known good backlight and that remained dark.
If I connect an external monitor the image is fine. If the inverter is getting power could it still be a faulty cable from the motherboard. I also thought it could be a stuck lid switch but I have yet to find one. @ R, After running for around 20 to 30 minutes, the display goes very dim.
If I then open and then close the display, it will come back on. Once the display goes out, it only lasts for about a minute. Does this even in CMOS / setup so does not appear to be a setting issue. Tested with an external monitor and works fine.
Sound more like an inverter or back light issue? No, it’s not settings related issue.
Sounds like either bad inverter or failing backlight lamp. You cannot tell which one is bad without testing the laptop with spare screen or inverter. If you have to guess, try replacing the inverter board first. @ dave, i have a compaq presario cq60 ive had just ova a year an now the screen wont show display all shows is blue square 3/4 of screen with white squares in an a 1/4 black with the same white squares bit if i connect to external display its fine any ideas please It would be easier if you can take a picture of your screen and upload somewhere. You said the external screen works fine. Did you test it thoroughly?
Does external screen work absolutely normal and there is go garbled image on it at all? @ Aijaz, When I power on my laptop, the screen shows very white, that means lcd inverter working fine, but displaying nothing, while the other process continues, such as H.D.D Reading,etc. Kindly solve my problem. Sounds like your laptop still works but the LCD screen not getting data signal from the LCD screen. Please test your laptop with an external monitor. Can you get normal image on the external screen? First, I would try reconnecting the video cable on the back or the LCD screen.
It’s possible this is just bad connection between the cable and the screen. Reseeating the connection might fix the video problem. I have one MSI CR700 notebook from 2years and half. Last year I had to replace his display because it got broken.
This year it began doing the following: Sometimes, when working on darker environments(especially games, but also black background web pages) the image brightness become intermittent darker, and black at all after a while. Sometimes it becomes white at all, this sometimes even after powering on the notebook, also happened after I reinstalled windows at all, Before I installed the graphic card drivers which makes me think it should not be the video card. Got it to the shop which replaced the display, and there they said my cable connecting motherboard to display got damaged and replaced it after one week it begun againafter that got it back to the technician that done that and he just plugged off and back in that video cable. It worked fine for other 2 weeks, when it begun again.
I also notice that it sometimes it reacts when I touch the screen (making problems disappear or making even worse) which makes me think there is somewhere, something making a bad connection to my display. What you think I should check? Is it possible that inverter or back light make the display both dark/black or white? And that not all the timeit may work fine for 3-4 days.
Hi My w700 was used more than 3 years. Last week, inverter was not working. I checked it by multimeter: power input was ok but no power output. Video cable and backlight were working well. I purchased a new inverter from IBM parts center, installed and then problem solved. But after a few days, the problem came back, checked by multimeter, the new one was broken again.
I checked the inverter board, and found ohm of a pair of small capacitors was zero (very quickly to zero and meter never changes). It seems the capacitors were damaged. The two boards have same capacitor problem. This pair of samll capacitors are located just on top of the coil. Video cable and backlight have no problem. I don’t know if it is the capacitors making the inverter malfunction?
Something must be wrong making the board broken again, and why? Please can you help me to solve this problem.
In most time this w700 uses external monitor only, and sometimes uses both screens. I have a laptop Asus A53SV-XE1. Last week when I turned it on the OS went up as usual, but a few seconds later the screen went very dim, at a point that you couldn’t see anything, but it wasn’t a black screen, just as I said; really dim. I immediately thought it was the screen inverter, but just to make sure I made a few tests to see if my video card was alright. Everything was fine.
I used it with an external monitor for the past week, but yesterday when I turned it on again, the screen went on perfectly, but it stayed on for about 10 minutes, then dim for 5 (or something like that). This happened for like half and hour. However I kept using it for a couple more hours and the intermittence stopped and now the screen hasn’t gone dim again, not even for a few minutes, it doesn’t matter if I try shaking it. I want to know what happened and see if I have to take some sort of precaution. I’m a laptop technician from DR, but I’m amazed by what happened and I want an explanation.
Hi there and welcome to Tom's Hardware, HP does not list component drivers for Vista or Win-7 for your model, Here is the HP link for your Compaq NX9010 for review: Might download and run the Win-7 Upgrade Compatability Advisor to see if your laptop will work satisfactorily with Win-7 Here is the link: If there are just minor incompatabilities like not working with Aero, you can live with that, but if there are no updated compaq drivers for the graphics card, modem, etc., then it can be problematic. The upgrade compatability advisor should point those out.