820-3208 intermittent display

Rford

New member
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?
 

larossmann

Administrator
Staff member
What voltage is PPVCORE_S0_CPU when you have no screen?

What voltage do you measure on pin 1 of U9000 when you have no screen?

How does pin 2 of R7402 look?
 

dukefawks

Administrator
If it still turns on and chimes I think it will be SMC_LID, it should be high with the LCD open. Check IO board and cable for corrosion.
 

Rford

New member
I suppose that suggests vcore, but there is voltage and everything looks fine around the buck converter.
 

dukefawks

Administrator
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
 
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