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

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

Administrator
Staff member
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.
 
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dukefawks

Administrator
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?
 

dukefawks

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

Administrator
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.
 
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