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原帖由: Chuck ,

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I specifically buy 3gs iphones with DIM screens (no backlite) to repair.

In my opinion, here are the most common causes:

1.  Corrosion at #1 LCD connector on board and/or LCD

2.  Bad LCD

3.  6R8 coil & chip/curcuit problem

The quickest test of backlite curcuit is:

Power on phone, remove screen, and do lite test at pin 3 of #1 LCD connector on board.  If there is power...backlite curcuit is probably not broken.  If not, troubleshoot backlite curcuit.

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