Originally Posted by Popup
I just checked, and they're still there.
So after the next recovery, don't pick it up.
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Seriously, I was looking at it but can not see how the board would be stressed by picking it up (or turning it over) at any point other than where the frame, board and battery are clamped together by the battery screws.
It almost had to be face up when it was running for you to report the changes in the screen.
It almost had to be face down to install the battery or to start putting the back on it.
The board is looks like it is held to the frame by at least nine screws, and the frame is just not that flexible.
That plus the two screws holding the light switch / serial port connector in place.
Did you remove the board from the frame during the inspection and attempts to clean?
Did all of the microscopic connectors get properly seated when reassembling?
Note: The screw next to the mini-PCIe connector also has one of those formed "ground clips" under it.
Check also in the area around those two light connectors (the top "tab" is the power, the bottom one is the sensor tabs and serial port connection).
That screw on lower port connection is in two parts, did it get opened and perhaps closed again with either the sensor contact or the Rx contact shorted to ground?
(Ground is in-between those two pads.)
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Mechanical error seems much more likely than a micro-crack in the board, at least not the way this board is fastened to the relatively ridged frame.