820-3462 No Green Light

awbower

New member
I am on my third SMC replacement and can't get green light back (I had green light prior to replacing SMC). I don't know if I just have a bunch of salvage boards with bad SMCs or if I caused a new problem during the replacement.

The following signals are present:
PP3V42_G3H
PPBUS_G3H reads a bit low (12.28V)
SMC_BC_ACOK
SYS_ONEWIRE
ADAPTER_SENSE
SMC_RESET_L
SMC_ONOFF_L

I do not have SMC_PM_G2_EN

I've replaced plenty of SMCs before but have never had this level of difficulty...
 

2informaticos

Administrator
Staff member
Looks like SMC doesn't work.
Check its voltages and signals at page 39; U4900 (2 OF 2).
Be sure to get SMC_XTAL frequency.
 
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