2nd opinion on laptop screen

[Big Jim]

I'll try and be concise
booked in a laptop that had been dropped, screen broken, lid broken
customer approves replacement screen only. (current screen working at this point but broken)

new screen arrives, remove battery and discharge laptop, test screen before fitting, works ok.
re-assemble laptop now screen just displays a white image
check screen cable at both ends and it is fine.
test old screen again, now this just displays a white screen (can hear windows loading in background)
test on external monitor, internal screen turns off and external works fine

diagnosis ?
I am leaning towards the cable but it's weird how it has given up all of a sudden ?

 

[coffee]

I'll try and be concise
booked in a laptop that had been dropped, screen broken, lid broken
customer approves replacement screen only. (current screen working at this point but broken)

new screen arrives, remove battery and discharge laptop, test screen before fitting, works ok.
re-assemble laptop now screen just displays a white image
check screen cable at both ends and it is fine.
test old screen again, now this just displays a white screen (can hear windows loading in background)
test on external monitor, internal screen turns off and external works fine

diagnosis ?
I am leaning towards the cable but it's weird how it has given up all of a sudden ?

Cable or wrong screen, More damage not discovered on the MB.

coffee

 

[gatestechsol]

Just fixed a HP laptop with a white screen. Turns out it was the cable. If the cable isn't too expensive, you can buy it and switch it out. If that fixes the problem, I would bring it up with the customer and see if he/she will pay for it.

 

[HubCityPC]

Just had a screen replacement that gave me some problems as well. For the first time in about 60-70 screen replacements, I actually had a bad video cable.

 

[david248005]

Just had the very same problem with a Toshiba screen. Only booted to a white screen. Turned out the LCD cable had an internal break, with the lid opening and shutting it had put strain on the cable.
New cable and all was good

 

[NYJimbo]

What we need is a end-to-end 40 pin LVDS continuity tester. Something where you plug both ends of the cable into a box and all it does is send a volt through each line and light a LED on each line. The LCD end would be easy but the motherboard end would be more tricky. You would energize the unit and then wiggle it to see if you are getting all lines and if you wiggle and see a dead line or broken on/off you would know its a bad cable and you would be done with it. This wouldn't work for ALL screens but it would work for the majority of the screens we techs deal with.

Its gotta be something easy to make.

 

[CTech]

Almost certainly a cable issue... Maybe just an over-vigorous tug when removing or reinserting? Only takes one of those tiny wires to break to cause problems