Toshiba p100-327 white screen - but ok on external monitor

October 3, 2013 at 06:01:24
Specs: Windows 7, 2gb
Toshiba p100-327 displays white screen does not show post - when connected to external monitor boots to windows OK. Any advise welcome- could this be the video card?

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October 3, 2013 at 10:19:58
I think it's an integrated graphics chip on the P100, but no matter; if it displays ok on an external monitor, then the graphics are ok, as is the laptop apart from the screen.

Do you still get the initial POST screen when you first switch on or is the screen devoid of all life?

I'm guessing it could be the screen that's gone west, or maybe the plug connecting the motherboard to the screen has come adrift. It's common enough on some models.
Often the display can return briefly as you open and close the lid or flex the casings.
If it's just that, it would be easy enough to fix, but requires a partial strip down to reseat the plug/socket.

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October 3, 2013 at 11:28:11
Hi, thanks for the response. Tied a he 327 has a seperate video card. The plug is securely connected I have now tried a screen from another laptop on the end of the ribbon cable with the same response. I now suspect the ribbon cable but I am unsure as the video data still goes through the motherboard.

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October 4, 2013 at 00:47:46
When you tried another laptop screen did you also remember to plug in the feed for the backlight?

Assuming you did so, and assuming it was a good screen, then it seems logical the fault is between the display output socket on the motherboard and the screen - this being the ribbon cable.
However, I've not known of a ribbon cable failing, other than being damaged when attempting a repair.

It's certainly not the graphics output side of things, or else an external monitor wouldn't work - although..., is there an Fn-key function that toggles between the inbuilt and external monitor? It should auto-switch, but maybe worth a look.

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