Fixing bad video on LCD screen

posted in: Screen, Troubleshooting | 894

Here I’m going to post some laptop screen photos showing bad video output. I’ll explain what was wrong with the screen and how I fixed it. I plan to ad more examples as soon as I get new pictures. If you have your own example (and know how to fix it) please let me know and I’ll post it too.

Example 1.

Here’s a picture of Satellite M55 LCD screen I made this morning. I got this video output as soon as I started the laptop. There were a lot of vertical lines, and they were changing color without any pattern. To me it looked like Northern Lights (never seen in real life) :). The external monitor worked fine.

LCD screen no image

As soon as I applied some tension to the screen it changed the pattern. Some horizontal lines appeared in the middle of the LCD.

LCD screen horizontal lines

Here’s the difference. When I torque the screen, the image appears but it’s distorted with some horizontal lines running across the screen.

Reseating the video cable didn’t make any change and the problem was fixed after I replaced the LCD screen.

Example 2.

I took this picture from Toshiba Satellite M65. I think that this example is very typical. One day you wake up, turn on the laptop and see one or a few hair-like vertical lines in different colors.

Laptop LCD vertical lines

When you move the LCD screen some lines might disappear or more lines appear on the screen. A video output on an external screen would be perfect, without any lines. Unfortunately, these lines indicate a screen problem. I’ve never seen this kind of video output caused by a bad video cable or bad FL inverter board. My laptop was fixed after I replaced the LCD screen.

Example 3.

The photo below comes from Toshiba Satellite 5205. The laptop displays identical vertical lines all over the LCD screen as soon as I turn it on. Sometimes these lines are red, sometimes they are blue, sometimes they become wider and change color to white.

Laptop screen vertical lines

The same pattern appears on the external monitor. It displays same vertical lines. When the same video defect appears on both monitors – internal LCD screen and external screen, then most likely it happens because of a bad video card. On some laptops the video card is integrated into the system board, on other models it’s a separate module.

External screen vertical lines

In this example, the vertical lines were caused by a failed video memory on the system board. I’ve tested the video memory with Microscope utility and it failed the test. In Toshiba Satellite 5205 the video memory is integrated into the system board. To fix the problem, I’ll have to replace the board. (We do not have equipment to replace the memory module itself).

Example 4.

Here’s another example of a bad LCD screen. My bad! It wasn’t the LCD screen problem.
Bad reddish laptop screen

As soon as I turned on the laptop, I was getting these reddish marks on the LCD screen but not on the external monitor. Reseating and replacing the video cable didn’t help. The problem disappeared when I installed my test LCD screen. Yes, for some reason I wasn’t able to reproduce the problem on my test LCD screen. But the reddish video appeared again as soon as I replaced the screen. I guess it happened because the system board had some kind of intermittent problem with onboard video or video connector. Long story short, I had to replace the system board and it fixed the problem. Yep, I misdiagnosed this laptop.

Example 5.

Here’s one more example of a faulty LCD screen. The left half of the screen works just fine but the right side is completely white.

Half LCD screen not working

Example 6.

Here’s another laptop with a bad LCD screen. This time it’s a tablet PC.

Vertical stripe on LCD

Example 7.

This screen looks like the screen on the example 1. I hooked up an external monitor and the external video works perfectly fine.

vertical lines

Here’s the difference. When I torque the screen, the image appears but it’s distorted with some horizontal lines running across the screen.

distorted image

After a few seconds the image washes away.

Image washes away

I had to replace the LCD screen.

Example 8.

This laptop displays inverted colors right from the startup. As you see, the Toshiba logo is light green instead of red. The background is light gray instead of black. The Intel logo should be blue on a white background but it is red on a black background.

Inverted colors

When your laptop displays inverted colors as on the picture above, this is an indication of a bad screen. You’ll have to replace the screen.

Example 9.

Here are two more screens. In both cases this problem is related to the LCD screen, witch means the screen has to be replaced.

On the image below you see a white band running from the top of the screen to the bottom. This band appears right from the laptop startup and runs through the logo too.

White band running from top to bottom

On the following image only the left side of the screen is working properly. This problem is caused by faulty LCD screen.

Only left side of the screen works

Other post related to troubleshooting laptop video problems:

How to troubleshoot and fix laptop video problems
Taking apart notebook LCD screen
Replacing LCD screen inverter
The newly installed screen is not working


894 Responses

  1. Geoffrey W.

    Bought a screen on ebay from ebay seller Laptopaid. Had example 8 problem, inverted colors, tested on another laptop, same model and same thing, inverted colors. Contacted them and now i need to pay out of my own pocket to ship it back to them!? i don’t see why i need to pay to ship it back? it’s their mistake not mine. I already lost money on time and now i’m losing money on shipping an item back to them because they sell defective items? Do not buy screens from “Laptopaid”

  2. Having issues with vertical lines om 1/3 of the screen. Occasionally I can get them to go away but the desktop is still not correct, I am trying to find a disassembly procedure for my HP Pavillion dv6 1245dx… can you help?

  3. Nak,

    I have a Dell Inspiron E1505 laptop with a bad screen. Example 5 and 6 in the pictures above. It was caused by voltage spikes. Can this be repaired without screen replacement? Or is replacement the ONLY solution?

    First of all, test your laptop with an external monitor, just to confirm that your problem is related to the LCD screen.
    If external image works fine, most likely this is LCD screen failure.
    No, you cannot fix that problem, you’ll have to replace the screen.

  4. I have a Dell Inspiron E1505 laptop with a bad screen. Example 5 and 6 in the pictures above. It was caused by voltage spikes. Can this be repaired without screen replacement? Or is replacement the ONLY solution? Thanks for your help.

  5. I have an Asus UL50V. There is a single, yellow line that runs down the exact center of my screen. It doesn’t flash or move. It simply sits there. Sometimes it’s there and sometimes it isn’t. Any idea what it is or what could have caused it?

  6. Hello!

    I have an old Toshiba Satellite M55-S3291.

    After some time, colorful vertical lines began appearing on the LCD, and now they’re covering the whole right side of the screen.

    They -used- to fade away after a bit of pressured was applied on the LCD, but now they stay and I’m left with a bit less than half of the screen.

    Please, help?

  7. Eric,

    I have an Acer Aspire 5000 laptop. The entire display is shifted to the right on the sceen so I cannot see the part being offset. The display quality seems ok.

    Hard to tell. Can you test the laptop with an external monitor?
    How the image appears on the external screen, is it normal?

  8. I have an Acer Aspire 5000 laptop. The entire display is shifted to the right on the sceen so I cannot see the part being offset. The display quality seems ok. Could someone tell me what is wrong

  9. Dave,

    I have a HP G7000 laptop. I have just bought and istalled a new screen but when I boot it up at first I get a completely white screen and after it has gone through the boot up process it ends up with half the screen white and half black/or dark grey. There is no text on the screen. Like I said this is a brand new screen. I have tried reseating the video cable but still no luck.

    Test your laptop with an external monitor. Can you get any image on the external screen?
    Why did you replace the screen? Was it broken?

  10. I have a HP G7000 laptop. I have just bought and istalled a new screen but when I boot it up at first I get a completely white screen and after it has gone through the boot up process it ends up with half the screen white and half black/or dark grey. There is no text on the screen. Like I said this is a brand new screen. I have tried reseating the video cable but still no luck. can you help?

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