820-4924 no fan spin and not recognizing battery

[tlough75]

Ok so I have two problems:

An 2015 A1502 13" Retina Pro came in with liquid spilled on the logic board. the computer still works and when I pulled the logic board I saw no signs of corrosion. I decided to UC the board and reassemble the computer. It boots to an OS just fine but the Fan does not spin and the battery is not recognized.

Any ideas? I checked the pins of the fan header and saw nothing to do with corrosion.

 

[tlough75]

Looks like the board connected to the battery suffered some corrosion.

 

[2informaticos]

Exact PPBUS_G3H voltage, w/ and w/o battery?
Also postn diode mode and voltage for SCL/SDA lines of battery bus.
Fan doesn't start untill CPU gets hot enough, as normal behaviour for 4924 board.
It should start at max in SMC bypass.

 

[tlough75]

PPBUS_G3H:

w/battery: 12.57v
w/o battery: 12.57V

SCL/SCA:

w/battery:
SCL: 3.40v Diode is .499
SDA: 3.40v Diode is .498

w/o battery:
SCL: 3.41v Diode is .532
SDA: 3.41v Diode is .530

 

[tlough75]

Oh yeah and you were correct that when started in SMC bypass the fan does in fact spin. So strange.

 

[2informaticos]

"the board connected to the battery suffered some corrosion"
Try known good battery.
Battery bus looks OK...

 

[tlough75]

Ok, gave back to customer. He said he put another battery in but it is showing 0%. It also says service battery. I asked if it was a new one so I am waiting to hear back

 

[tlough75]

Customer tried new battery and now it is charging. But says Camera not working

 

[tlough75]

This one is solved