820-00165 Does not charge battery but runs off and recognizes battery

[Therealkilometers]

Computer will run off battery and recognize battery percentage but not amperage in system profile. When plugged in it will change to charging but percentage will not increase. Current sensing resistors all check out fine. Battery works fine on another board. Is this a SMC or SMC data line issue?

 

[larossmann]

is ppbus_g3h 8.4v or 16v when charger is connected & battery is unplugged?

If PPBUS_G3H is 8.4v, I'd make sure known good battery is connected and replace Q7155. If PPBUS_G3H is 16v, Q7130 is shorted and battery is not charging as protection so it doesn't explode.

 

[dukefawks]

If it is not showing a current drain from the battery there must be something wrong with the sense resistors or traces. Resistance between pin 17/18 27/28 of the ISL6259?

 

[Therealkilometers]

17/18 2.7 Ohms, 27/28 20.1 Ohms. PPBUS_G3H 8.56V. Replaced Q7155 and still having the same issue with multiple known good batteries.

 

[dukefawks]

Check BMON circuit R5422 etc. Was this liquid?

 

[Therealkilometers]

BMON circuit checks out fine. It was liquid in the Battery, thunderbolt area of the board

 

[dukefawks]

U5430/40 check corrosion. Run onboard diagnostic.

 

[Therealkilometers]

No corrosion around the U5430/40 area. Diagnostics give error PPP007 (Power adapter was not tested).

 

[dukefawks]

Uhm, did you have a charger connected? Is the charger getting a green then orange light without battery connected?

 

[Therealkilometers]

Yes a original 85W Magsafe was connected. Charger light is always green with or without battery connected. While OS shows 21% battery life. This is why i was thinking SMC?

 

[dukefawks]

Charger is not recognized ti should turn orange even without battery. Replace IO board and cable first.

 

[Therealkilometers]

Tested with known good IO board and Cable still the same thing.

 

[dukefawks]

SMC_BC_ACOK present?

 

[Therealkilometers]

3.4V on SMC_BC_ACOK

 

[dukefawks]

Inspect J9500 for corrosion especially pin 19 and 21. This is a one-wire circuit issue. Not more to it then IO board/flatcable and connectors. Last thing would be SMC.