Black Screen on a Toshiba Qosmio X505-Q877

Greetings,
I’m trying to resolve a problem I’m having with a Toshiba Qosmio X505-Q887 laptop.
The screen was black when the customer brought it worked with an external monitor.
I did have to replace the motherboard but it didn’t resolve the black screen issue.
I have tested and replaced the memory with a known good module but still no picture.
I have replaced the LCD screen and the inverter and still no picture.
I have upgraded the Bios and the Video Driver and still a black screen.
The only left I can think of is the LCD Video Flux screen Cable may be bad.
Does anyone know if there is a way to test the cable to see if it’s getting power from the motherboard?
I have searched the internet and can’t find one I need.

I have attached a picture of the one I'm trying to find.
Greetings,
I’m trying to resolve a problem I’m having with a Toshiba Qosmio X505-Q887 laptop.
The screen was black when the customer brought it worked with an external monitor.
I did have to replace the motherboard but it didn’t resolve the black screen issue.
I have tested and replaced the memory with a known good module but still no picture.
I have replaced the LCD screen and the inverter and still no picture.
I have upgraded the Bios and the Video Driver and still a black screen.
The only left I can think of is the LCD Video Flux screen Cable may be bad.
Does anyone know if there is a way to test the cable to see if it’s getting power from the motherboard?
I have searched the internet and can’t find one I need.
 
Greetings,
I’m trying to resolve a problem I’m having with a Toshiba Qosmio X505-Q887 laptop.
The screen was black when the customer brought it worked with an external monitor.
I did have to replace the motherboard but it didn’t resolve the black screen issue.
I have tested and replaced the memory with a known good module but still no picture.
I have replaced the LCD screen and the inverter and still no picture.
I have upgraded the Bios and the Video Driver and still a black screen.
The only left I can think of is the LCD Video Flux screen Cable may be bad.
Does anyone know if there is a way to test the cable to see if it’s getting power from the motherboard?
I have searched the internet and can’t find one I need.

A000051860 - LCD w/ CCD Harness

Thanks,
Larry
TplayerAsked:
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Natty GregIn Theory (IT)Commented:
LCD screen has a bulb seated at the bottom of the screen small tube like, fluorescent light did you replace that, no light no screen.
web_trackerComputer Service TechnicianCommented:
It looks like you tested everything else, I would replace the wiring harness. You almost replaced the whole laptop.
nobusCommented:
can you see a faint image on the screen? shine a light on it? that would mean it is the backlight failing
since you have 2x mobo and screen, it could be you have a bad replacement screen (bad backlight also?)

can you test the backlight of another working screen separately?
maybe this helps :  
https://www.youtube.com/watch?v=PfA280htj0k

https://www.youtube.com/watch?v=2Yi6GNFcP3w
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TplayerAuthor Commented:
I was sure it was the inverter so that was the first thing I replaced. There was absolutely no light or image coming from the screen so next I replaced the screen which didn't solve the problem either. The bulb would have been the next thing I should have checked before buying a new screen but since I did I will assume the bulb is good.
The only thing left from original monitor is the LCD video cable.

Does anyone know of any online shops that might carry them?
Regards,
Larry
nobusCommented:
did you see the image on the dark screen?
TplayerAuthor Commented:
No, there was no image on the dark screen.  I guess I'm going to keep looking for the harness, it's the only thing left to try.
nobusCommented:
if you did not see the faint image, then i must suppose the video does not come out to the screen
cable is a possibility; check also the plug for dust, or paper debris
web_trackerComputer Service TechnicianCommented:
also check for bent pins on the socket of the mobo.
MereteCommented:
It also sounds as if the default monitor was set to the secondary screen.
When the secondary screen was removed the main laptop screen is still stuck as a secondary screen Possibly?
Do you get a bios boot screen?
Safemode?
nobusCommented:
Tplayer - how about some feedback ?
TplayerAuthor Commented:
Thank you for all the ideas. In this case it was the flex lcd video cable that needed to be replaced. The constant opening and closing of the lid wore out the cable not visible from the outside. I had to order a new one all the way from China via ebay.
thanks again for your help.
Larry

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nobusCommented:
don't forget to close this out then !!
TplayerAuthor Commented:
Sorry but I never did get this fixed
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