[SOLVED]820-3208 no light on charger

[arnonabuurs]

Hello I have an 820-3208 with no light on charger. Stable PPBUS at 8.16v and I get 3.42v on U6901 pin 5. I noticed SMC_BC_ACOK is swinging between 3.27 and 3.38v on pin 1/2 which seems not OK? Any suggestions on what could cause this, or is this normal?

Note there was liquid spill at L6995 area but it has stable 3.42 coming out

Some more values, i assume SMC might have crap under it

SMC_Adapter_EN = 0
SMC_LID = 3.41
SMC_RESET_L = 3.38

 

[TCRScircuit]

Does the ISL area look ok?

 

[larossmann]

the ISL6259 is doing its job if SMC_BC_ACOK is high and PPBUS_G3H is 8.1v. The SMC is going to tell the ISL6259 to take PPBUS_G3H from 8.1v to 8.4v when the SMC turns on. The SMC isn't turning on.

If SMC_RESET_L is 3.38v, the SMC is being told to turn on, but is not. So either the SMC is dead or there is some corrosion under it. I would give it a light reflow, if that doesn't fix replace SMC.

The spill around L6995 probably got to the PP3V42 regulator as well and caused it to send a spike of 8 or 16v to the SMC, which could've killed it.

 

[dukefawks]

Smc issue likely. Corrosion or dead

 

[arnonabuurs]

Thanks for the reply guys, this topic can be closed

 

[aprendiz]

So, where was the problem????

 

[arnonabuurs]

Reflow SMC solved it