a1278 2011 820-2936 missing CPU vcore

roy.ruan

New member
hi

got a 820-2936 board. board got liquid spilled.some or bit on u2800 q5030 r7551 ( those areas)

board power up but missing CPU VCORE.

checked on U7400 PIN1 VRON 3.3V PIN2 0.5 PIN 40,24, 15 are around 5v

should be good to go , but no CPU VCORE,replaced U 7400,Q7550 Q7520 already. same thing

one hint i found out was diode mode on pin 1 R7555 was "0" , i measured on another board is around 500-600.
so i think either u7400 or Q7520 is bad, i replaced both. then checked, back to normal around 500-600

but once i connect power, no CPU vcore, then disconnect charger. check again later, back to "0"

kind of confused with that and stuck now

any advice would be appreciated!
thank you!
 
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