LVDS Connector replacement; still no display
I am attempting to repair the logic board from my mid-2010 iMac (820-2901). The LVDS connector was damaged and two pads were lifted (pins 1 and 2).
I have replaced the connector:
Pin 1 is a ground pin, so should not be required to make it work and while I have bridged pin 2 to the corresponding via, but according the the board schematics, this is only connected to an unpopulated resistor position (R9050) so should also be non-essential.
Unfortunately the display still fails to function (external display works fine and have tried two different GPU boards) and only 3 of the diagnostic LEDs are lit. I have tested all ground pins on the connector and all pins that have nearby uncoated vias (pins that go straight through the board are much more difficult to test; is there any advice as to how to do this?), as well as checking pin-to-pad continuity for all pins and confirming no pins are shorted to their neighbors (except for pins 23-26 and 26-30 which are groups of ground and power pins respectively). I have also tested all connections on the LVDS cable.
I’m really at a bit of a loss as to what else to check. I’ve even already purchased a replacement board, but annoyingly it was damaged in shipping and is being returned.
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Did you check for shorts of neighboring pins?
might want to try and clean up pins 23 - 24 they look like they might be shorting?