820-3115 a1278,must hold power button for 5-6 seconds to power on with battery

roy.ruan

New member
Hi guys,
working on an a1278 820-3115 board, it got liquid spilled before, around SMC area, no power at all originally.
fixed the circuits then it can run with charger. but once battery inserted,it can't power on.

check the bat_low signal was not present, then replaced the SMC, status changed, it can power on even with battery inserted now, but only power on normally with charger connected as well.
if no charger, you must hold the power button for 5-6 seconds then the machine will power on.

it can charge battery,detects battery.

another SMC had been replaced too, same result. another battery,same result.

don't know where to start this now

any advice would be appreciated.

thank you
 
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