LCD showing White Screen on my HP Compaq 8710w Laptop

[lejonxa]

I've got an HP Compaq 8710w Workstation for a laptop.

Specs are:
Intel Core 2 Duo T9500 2.6 GHz
4GB DDR2 RAM
NVIDIA Quadro FX 1600M - 512 MB
LCD Display is LG Philips LP171WU3-TLB1
Windows 7 Ultimate

A couple of months back, the LCD started displaying multiple shades of colors (blue, green, pink etc). I could still see the desktop and was usable (but irritating). Recently, the LCD stopped working altogether and displays a plain white screen when I turn it on.

Stay with me while I try to figure out what's going on. This is a weird case.

1. The LCD displays a white screen, so I know that the inverter and the backlight is working fine.
2. I connected the Laptop to an external monitor and it worked fine. So I concluded my GPU is working fine.
3. I bought and replaced the cable that connects the LCD to the motherboard, no dice. Still shows the white screen
4. I concluded that the LCD board might have got damaged and went ahead and bought a new LCD Screen Assembly (this consisted of a the entire upper component of the laptop including a new inverter, backlight, LCD, cable - the whole shebang. Costed 60$, shipped in from the US). I replaced it, and the new LCD still displays the white screen!

I can only think of two possibilities:

a. The New LCD that I bought is damaged and have to be replaced (It might be even be a loose cable, but I can't open it up to check as I won't be able to return it if I do)

b. The motherboard or GPU is damaged - which doesn't make sense as it works great on an external Monitor. Even boots into Windows.

Any suggestions on how I might proceed?

 

[mcnumpty23]

check the motherboard connector for the lcd cable

had that happen once and there was something wrong with the motherboard connector

it will still work on an external monitor if that connector is faulty

 

[lejonxa]

check the motherboard connector for the lcd cable

had that happen once and there was something wrong with the motherboard connector

it will still work on an external monitor if that connector is faulty

I checked out the lvds connector, doesn't seem to be damaged - all pins intact. Anything I can look for or anyway to check if the connector is working okay?

 

[mcnumpty23]

if the motherboard socket for the cable doesnt look visually damaged then other than replace the motherboard i think youre

stuck

though some one else may come along with opinion or suggestion different from me

 

[farsin]

I'm also having a similar issue. when i switch on the computer all i get is a white screen and if i keep it for a minute or so i can get the image appearing and i can work on that for may be hours and i could restart and shut down and immediately switch it on again and without a problem. but if i keep it switched off for 2 or 3 hours when i switch on i can see the dell logo but it fades into white after 2 or 3 seconds. if i switch on after more than that time all i get is a white screen. external monitor works fine. btw my laptop is a dell inspiron n5110

 

[mcnumpty23]

I'm also having a similar issue. when i switch on the computer all i get is a white screen and if i keep it for a minute or so i can get the image appearing and i can work on that for may be hours and i could restart and shut down and immediately switch it on again and without a problem. but if i keep it switched off for 2 or 3 hours when i switch on i can see the dell logo but it fades into white after 2 or 3 seconds. if i switch on after more than that time all i get is a white screen. external monitor works fine. btw my laptop is a dell inspiron n5110

i would replace the lcd cable--those are usually the symptoms that theres a tiny break in the cable some where