Fixing bad video on LCD screen

posted in: Screen, Troubleshooting | 895

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



895 Responses

  1. @ David,

    I have a samsung np-n130 , the screen is like the first picture you have posted and I have replaced the cable and still the same

    If you screen looks like picture 1, this is LCD screen failure. You’ll have to replace the screen.

    I tried to project it to an external monitor but with no look but that could easily be the fn button not working due to it not being set up prior to this as I’ve experienced this with laptops before

    On some laptops you can project to the external monitor only after the laptop booted to Windows. It’s possible your laptop is like that.

    so I’m just wondering do you think it’s the video card or the LCD

    Probably the LCD but cannot tell for sure without testing the laptop.
    Here’s what you can try.
    Disconnect laptop video cable from the motherboard and try booting with an external monitor after that. When there is no internal screen connected, the laptop should start with the external monitor. If you get external image, probably the video card is fine.

  2. @ Salman,

    What is the solution of example 2?

    Replace the screen.

  3. Hi I have a samsung np-n130 , the screen is like the first picture you have posted and I have replaced the cable and still the same, I tried to project it to an external monitor but with no look but that could easily be the fn button not working due to it not being set up prior to this as I’ve experienced this with laptops before so I’m just wondering do you think it’s the video card or the LCD , the screen has coloured (northern lights) changing all the time and after 2 min of leaving it on the right part of the screen gets much worse ,

  4. What is the solution of example 2?

  5. @ sevoy,

    i had a crack in my screen and i replaced it.. new screen displays everything fine but the images are frozen untill i torque or put pressure along the edges of the screen. with pressure , it works ..with out the torqueing pressure the screen freezes on its last image displayed before letting off pressure..i triple checked all connections and dont wanna damage anything.. any help?

    Here’s something to try.
    Remove the screen from the display cover but keep everything connected. Test the laptop while the screen is removed. Does it work this way? If you still having the same issue, probably you got a defective scree.
    If the problem is gone when the screen is removed, make sure to assemble everything correctly.

  6. i had a crack in my screen and i replaced it.. new screen displays everything fine but the images are frozen untill i torque or put pressure along the edges of the screen. with pressure , it works ..with out the torqueing pressure the screen freezes on its last image displayed before letting off pressure..i triple checked all connections and dont wanna damage anything.. any help? its a lenovo t40 i think.

  7. @ Tedane,

    I have a hp dv6000 laptop with blank screen. It works perfect with an external monitor. I changed the screen and it is still blank..what else could wrong. please help?

    Did you change just the screen or the screen with video cable?

    This could be bad cable or loose connection between the video cable and motherboard. Try reseating the video cable connector on the motherboard. It’s located under the keyboard cover, close to the left hinge. Unplug the cable, plug it back into the motherboard and test the laptop.

  8. I have a hp dv6000 laptop with blank screen. It works perfect with an external monitor. I changed the screen and it is still blank..what else could wrong. please help?

  9. @ NAUMAN,

    LCD shows display up to Compaq logo
    then it goes off, with external monitor display is ok all the time.

    Take a closer look at the laptop screen after it goes off. Is it completely off? Maybe the faint image is still there? Look under bright light.

  10. sir i have
    COMPAQ Evo N610c
    when i turn it ON
    LCD Shows display normal upto bios screen {compaq}logo,
    after logo LCD goes off,
    display is normal with external monitor,
    when i restart it, then again LCD shows display up to Compaq logo
    then it goes off, with external monitor display is ok all the time.
    without hardisk and resetting rams problem is still same.

    i will b thankful to U.

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