820-2879 no ac

samiam

New member
get green light but won't power from ac
turns on from batt
tried replacing ISL already but same behavior




U7000
pin 2 = 16.5V
pin 27/28 resistance 20
pin 17/18 = 3 ohm




Q7085
chgr_agate
pin 4 = 15.5V
pin 1-3=16.5V

all measure ok for resistance
R7085
R7086
R7005
R7080
R7081

its Q7085 not opening right?
what would prevent it?
 

aprendiz

Moderator
This board does not power on by itself, you need to use power pads...

What is the voltage on PPBUS_G3H with only charger???
 

samiam

New member
nothing on PPBUS with AC
tried another Q7085 still doing same thing
power getting to there but not going thru
pin 4 supposed to be lower than PPBUS right?
maybe try another ISL?
 

samiam

New member
ok one side was a little up, got it flat now. powering on from ac, but still not charging batt. i see the green light flicker a little
 

samiam

New member
sorry should of noted in original post, was originally brought in not charging but i was able to run off batt before. so i tried changing ISL now its back to the original behavior, only difference is now you can see green light flicker a little like its trying
 

samiam

New member
ok its Q7055 not allowing it to charge, CHRG_BGATE is like 12V same as PPVBAT. I tried another mosfet and it is still doing the same thing. would have to be a bad trace to ISL or C7026 right?
 
Top