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If this is the model I'm thinking of the 3.4V rail is quite critical. Bad caps in these are not always obvious and they don't always bulge. The 3.4V rail comes from a DC-DC converter IC fed from 6V rail. I've found bad SMD caps and resistors around this IC before.
Clean any gunk from the thermal transfer blocks off the back of the board if you haven't already. I suspect this may be what caused the SMD resistors/caps to fail.
If the power supply is known good then that only leaves the main board. If a used main board is cheap enough it's probably the way to go. Bad SMD caps can cause all kinds of strange problems, but I've also replaced loads of high ESR reading caps and the fault remained.
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03-25-2015, 04:58 AM
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