A1398 820-3332-A no charging

I have an A1398 820-3332-A that is not charging.
It has some signs of corrosion, but works fine on charger.
On battery doesn't work, and doesn't charge (but is recognized),.
Can you help?


Staff member
Post exact PPBUS_G3H voltage, w/ and w/o battery connected.
Check voltage and diode mode to ground at SCL/SDA lines of battery bus.


Staff member
"PPBUS_G3H = 1.2V (W baterry)"
I meant charger AND battery; not battery alone.

12.27V on charger alone, there is a communication problem between SMC and U7000.
Diode mode readings look good, post voltage on SCL/SDA too.
Be sure R7000 is good.
Try known good ISL6259 chip.
If still the same, change SMC.

Just in case, test removing D6950 first.