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820-00138 Powers and boots, but no green light.

2informaticos

2informaticos

Administrator
Staff member
Did you try known good DCIN board?
There is a small resistor/coil in serie with ADAPTER_SENSE signal.
And one TVS diode which can burnt it...
 
S

SMMRepair

Member
Yeah, tried about a dozen. No luck. Thinking this one might be a PCB fault, but no cracks or damage visible. Might go ahead and call it quits on this one in the interest of time.
 
S

SMMRepair

Member
Yes :(

Thinking a PCB issue at this point. Literally everything else works except charging and green light. Board runs from charger, and will run from charged battery. All functions normal, but no green light and no charging ("battery is not charging"). All signals present and normal; ONEWIRE, SMC_BC_ACOK, 3v42, all present and steady with no shorts and full-continuity from charger --> U7000/1 --> q7080/ISOL --> ISL --> SMC.
 
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S

SMMRepair

Member
Using genuine 85W magsafe2 charger, yeah; tried 3 different ones.

I just bridged pins 4/5 of U7000 and no change. :(

I will check system report and report back soon; I might throw another SMC on there to be sure. I did pull from a parts board, so who knows. Would be wild if it had the exact same fault as the original, though, so doubtful. Will report back soon. Thanks, Vali.
 
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