820-00165 fan spins once

[2informaticos]

Then even VCORE comes up 1s too.
If board starts in SMC bypass, all power supplies are good.
You have problems with some sensor.
Check pages 41-43...

 

[JohnB8812]

If you measure on pins 27/28 of the ISL and I mean the actual pins on the chip, do you get 21 ohms now?

 

[ielectron]

yes its 21 ohm now, but it was 21ohm before, that was the first thing i checked, than i reballed and replaced the SMC, than the resistor went out, i replaced it, sothat part is ok now.

what i found is L5001, the pin after it was corroded, so the 3.4V did not come trough, it looks like that is the main power for the SMC, but than how come i had green light on the charger? now i fixed that connection with a wire L5001 to C 5001, but its the same. IS the SMC getting the 3.4V trough another trace? maybe i will cut the trace on a donor board to measure this...

i will check the sensors...

 

[2informaticos]

SMC main power rail goes to VDD pins.
VDDA and AVREF should be used by some analog blocks and AD converters.
AD converters are related with your problem, dealing with the sensors above mentioned.

 

[ielectron]

C5125 was corroded, i just removed it and now it works