LCD Failures
Hardware failure – LCD, inverter, cable or backlight
Symptoms:
- The laptop appears to start as usual but the screen is black, if you move it, it turns on and works properly. Failed cable.
- The laptop appears to start as usual but the screen is very dark, although it changes colour a little and you can see a very feint image. Failed inverter or cable 90%/10%.
- Immediately after starting the screen has dark pink/red tint and turns dark after a few seconds. Failed backlight.
- The screen flickers a few times but then turns dark, if you move it or tap it lightly on the sides, it flickers again. Failed cable or LCD 50%/50%.
- Screen is either black or white (no picture) and external monitor works. Failed cable or LCD 30%/70%.
- There are stripes on the screen (either vertical or horizontal) that change when you move the screen or tap it lightly on the sides. Failed cable or LCD 10%/90%.
In all above cases, if you plug in an external monitor, everything shows fine on it (you have to plug it in before starting the laptop and may need to press the “Fn” key together with one of the “F1″ – “F10″ keys to make the laptop recognize the external monitor).
Troubleshooting:
If the screen is black, look for the “lid closed” switch and try pushing it a few times. It’s usually a small switch near the hinges that is pressed when the lid(the screen) is closed. Sometimes these switches get stuck in the “lid closed” position that results in black screen(no backlight) or non-starting laptop. Also some laptops have a magnetic switch (newer Dells, most Macs, etc.) that doesn’t get stuck.
The most common failures are (in this order): inverter, “lid closed” switch, cable, LCD, backlight.
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This is what’s happening to my lcd screen: Immediately after starting the screen has dark pink/red tint and turns dark after a few seconds. Failed backlight. <– how do i fix this? what is the recovery process? thanks
Post NR 91,thanks a lot about your solution on the HP laptops.The white screen was due to a malfunction of the graphic card.Been struggling for 2 days……
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I have a HP DV6000 and my LCD has red and blue vertical lines. They started appearing last week and were not as prominent as they are now. Can anyone tell what is the cause ?
I’m having problem with my HP DV7, I took it apart to replace the DC harness and after that was done. I put it all back together and now the LCD won’t turn on. I have tested the LCD on another laptop and it works fine and has pictures. I have also tested another LCD on my DV7 and still the same results (blank) I tested the laptop with an external monitor and it boots up fine so I though it was the LCD inverter in which I went ahead and bought a new one. It arrived last week and when I installed it, it still won’t work. I bought a new LCD cable hoping this would solve it but still no good results.
I tried looking for a “Lid closed” button near or on the laptop but can’t find one..
Anyone knows what the problem could be? I tried ‘fn+f4′ and so on but only my external monitor is detected, and when I start up windows, it’s the same thing. no internal monitor detected.
Any help is appreciated.
Thanks.
I have a Dell Inspiron 1501. When I use the USB port for Web cams or Air cards for the internet, the screan is fine for ten to fifteen minuts then it turns into vertical stripes .
My HP laptop will work fine and then goes black. I shut the lid and then it comes back on. It is getting more frequent and sometimes it wont work at all! I have contacted HP and they want to charge me over $400 to fix the problem. Is it the motherboard? I dont think it is the backlight as it is working at the moment. It will work connected to an external monitor also. Any help would be appreciated.
I noticed that in some cases the laptop screen may turn white because of poor connection between the video cable and the LCD screen. I always check the video cable connection first. Reconnecting the video cable may fix your problem. If reconnecting the video cable doesn’t help, most likely you have a problem either with the LCD screen or with the motherboard. In my case the problem was related to the LCD screen and I had to buy new screen from ScreenCountry.com and replace it.
Also a blank screen or a dim screen could also mean graphic problem. Many HP laptops these days have that issue.