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820-3208 with corrosion only at u5010, r5000 and c5025. Changed them out, cleaned the area, turned on and display worked. Ran ASD with no issue. Suddenly the display stopped working. No more corrosion around the board, no BKLT voltage, no display... ideas?
So if the USB mouse does not light up and the is CPU Vcore then it can be anything. Throw it in the ultrasonic cleaner first, probably corrosion under SMC/PCH/CPU