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Fujitsu AMILO L7300 laptop - white display

Posted on 2007-10-11
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I have a Fujitsu Siemens AMILO L7300 laptop which was originally given me to fix because the power connector socket on the motherboard was non-functional. I replaced that and then discovered the power adapter is also non-functional. I've powered the laptop with a replacement adapter, but the screen displays white with an occasional faint yellow-brown line of colour. If Ilook really hard I can just make out the windows desktop when it finishes booting. I've attached an external disply which displays fine. I've opened the case and 'jiggled' the video signal and video power cables, but it doesn't alter the LCD display at all.
What is the likely source of the fault. As far as I know it hasn't been dropped, and the LCD panel is physically intact. So I'm suspecting some sort of power problem could have affected the display.
Any clues? How to diagnose?
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Question by:ComputerFundi
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Expert Comment

by:Mark
ID: 20056304
A white display usually means there is no video signal getting to the LCD. The white comes from the CCFL bulbs lighting up the display, but the lcd isn't active.
The video cable, or the LCD panel may be the issue as you are getting a signal to an external monitor proving the video system on the motherboard is working. The video cables can be quite sensitive to breakage even when none is apparent, just from opening and closing the laptop lid over time.
First replacement would be the video cable, then the LCD would be next.
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by:ComputerFundi
ID: 20061074
sparkmaker - do you know a good source of such cables?
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Mark earned 1000 total points
ID: 20061657
Searching for such a cable can be quite an adventure. The best method I have found is to use the product numbers that are on the cable itself or the LCD product number which is usually on the backside of the LCD. The identification of the LCD is the key, as the cable is particular to it, and cannot be replaced with another LCD models cable.
This model seems to be a European one and most of the North American sites I check do not have any reference to it. That doesn't mean it can't be found here, just need to know what model of LCD is in there in order to cross reference it..
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by:ComputerFundi
ID: 20231420
Hi Sparkmaker
Thanks for your suggestions. The owner of the laptop has taken it back, not requiring any further diagnosis. You can have the points anyway - it's useful information for me for future repairs.

ComputerFundi
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by:Mark
ID: 20232428
Thanks,
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