820-3437 ppbus @ 8.2v no light on the charger

[No-Clean]

Board had some corrosion around SMC (R5283 area) some traces were gone, I made them nice again with wire and tested for proper connection (R5283, R5296, R5185, R5021) all those pads were pretty bad, I gave the SMC a good reflow as it looked like the corrosion did not get under it, but still no light on the charger and ppbus is 8.2v, PP3V42_G3H is 3.42v at pin 12 of U7100, resistance to ground on ppbus is 0.143 measured in diode mode.

 

[JohnB8812]

SMC_RESET_L voltage? This sounds like bad SMC to me

 

[No-Clean]

SMC_RESET_L ​

is 3.39v

 

[JohnB8812]

Try new SMC. Must come from 3437 donor board

 

[No-Clean]

Will do, I have a donor

 

[2informaticos]

Reball SMC first, this could be good enough.

 

[No-Clean]

There was a little bit of corrosion under the SMC, so reballing it did the trick. Muchas gracias!