820-3462-A no green light

john

New member
I'm trying to figure out whats wrong with this board there's no green light
PPBUS_G3H - Present
PP3V42_G3H - Present
SMC_RESET_L - Present
SMC_DCIN_ISENSE - Missing
SMC_BC_ACOK - Present
PP5V_S5 - missing
 

john

New member
no corrosion around smc. how do i test it to be 100% sure that is the smc?
 
Last edited:

dukefawks

Administrator
To be 100% sure you replace it with a 100% new one. None of that is possible so just replace it with one from a scrap board and pray that it works.
 

john

New member
I replace the SMC and the fan is spinning I have a green light but there's no imagine and there's no chime. When I press the Shift+Control+Option I get a green light and then an orange one that means the SMC is resting. Is it something to do with CPU Vcore?
PPVCORE_S0_CPU is 0.95V
PPVCORE_S0_AXG is 0V
 

dukefawks

Administrator
It could be anything at this point. All power is there so it could be a bad SMC. It could be the termination resistors in the U6100 data lines. Did the SMC come from an identical board?
 
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