I dropped my Iphone 3GS on the floor and the display shows a white screen. Nothing appeared wrong with the display, no cracks, etc. I replaced with a new Iphone 3GS display assembly but still shows a white screen. Is the logic board the problem?
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Pull it apart again and make sure all connectors are tight and all the way clicked in. More often then not, they get loose when you put it back together.
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This is usually a sign of a bad lcd (the screen under the glass). If you do replace it, be very gentle with the front of the screen as the liquid contained inside will hold finger pressure and it will be noticeable when re-assembled
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Try a Reset, hold both Home and Power buttons until iPhone restarts on its own.
par Brad