02020 w 12.00V on PPBUS_AON

[captainmac]

Need a clear mind on this, been spending way too much time on this board
PPBUS_AON on this board measures 12.00V
I thought this has to be 12.6V on this board, right?
What can cause PPBUS to be too low?

Strange thing is, the board boots and works fine (i only don't have trackpad connected right now, waiting on new flexes to come in tomorrow)

A little history:
Board came in with a burnt out JT400 and some liquid around U8100 area.
Checked PP3V8_AON and it had a low diodemode value to ground, which i traced back to a (partially) shorted PP3V8_AON_MPMU_ISNS_VIN in U8100.
Replaced U8100 from a donor
Replaced JT400 and traces around it fixed

 

[2informaticos]

Is the battery charging with just 12.0V on PPBUS_AON?

 

[captainmac]

pfff battery is at 100% right now, so no charging is going on. will have to drain the battery a bit to see if its charging, will get back here.
so far, everything seems to be working normally, just that low ppbus voltage is bothering me

 

[captainmac]

OK so it definitively charges the battery.
Customer wants it back now, so this one is going.
The board is working, but i don't understand how PPBUS can be 12.00V without the battery...