820-00163 PPBUS_G3H 1.54v

MUUK

Member
Pre worked and cleaned board. (sorry)


ppbus_Gg3h not shorted 0.45v diode mode.
(U7330/20/10 not shorted)

Liquid damage to U7100 area

Replaced
U7100
R7151
R7152
R8131 - ran wire for pp3v42 as pin 1 burnt




U7100
resistance pins 23/24 u7100 22ohm
pins 17/18 u7100 3.4ohm

pin 2 15.8v
pin3 3.9v
pin 12 3.4v
pin 13 3.2v
pin 19/20 5.4v
pin 24 CHGR_UGATE 1.54v

U7100 is getting power and enable so looking to Q7130

Q7130
pin 5 16.5v
pins 1,2,3 = 1.54v
pins 4 = 1.54v

So Q7130 is not opening.

Looks fine.
Am i going down the right path here replacing Q7130 please ?
 

dukefawks

Administrator
Could be bad q7130/35 but I am more suspecting bad soldering/dead U7100 or a corroded trace to Q7130/35.

"resistance pins 23/24 u7100 22ohm" I hope you mean 27/28
 

MUUK

Member
Thanks Duke. Yes pins 27/28 22ohm (sorry)

Replaced U7100 with another from a donor board.
Ran a wire for CHGR_UGATE as i was wary of the trace on pin 24 U7100

Now get 5v on PPBUS_G3H.

Checked all the resistors etc around U7100 but nothing springs out. Does 5v give any hints ? (thanks)
 

dukefawks

Administrator
Nope 5V is still wrong and points to nothing. Remove the fuse to be sure the system is not pulling it down. Besides that it must be a bad trace/resistor/solder in the U7100 area. I assume 3V42 is present of course!
 

MUUK

Member
Came back to this one.

Found that CHGR_CELL probe point had gone so ran a wire.

Briefly plugged in and now i got charger voltage on PPBUS (20v)

Q7130 / Q7135 likely targets here ?

Thanks.
 
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