i had the same problem and came across a solution by Bob Allen and it worked!
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Re: Sony DSC-S40 white LCD screen problem Bob Allen - 25th Jul 2006 18:04
Quick update:
I fixed the camera myself as follows:
1. Hold camera firmly in left hand
2. Smartly rap front of camera with knuckles of right hand on the "Cyber-shot" logo.
It worked, now the LCD is working again for free.
Guess I don't need to pay Sony $111.00 for repair service.
Bob Allen
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