820-2850 No Green light . PPBUS_G3H stuck in 3.3v.

Don Anton

New member
Hi all,
THis is a liquid dmg board only near Q7030 ,Q7035, C7036,C7035,C7037. I replaced all these and still get 3.77v on R7021 & R7022 current sensing resistors.

Resistance between R7021 & 21 is 21ohms and R7051/R7052 is 2.9ohms.

I replaced U 7000 still the same.

q7080 all pins have 16.5v. Q7085 pin 1-4 I get 16.5v then the rest 3.7v

R7086 CHGR_AGATE both side 16.5v.

Well when the battery connected, I get 16V R7021/ R7022 and 10v on PPBUS_G3H and fan goes high.

this is what I get with our battery connected on U7000.

PIN 1 = 14.5V PIN 8 = 3.3V
PIN 2 = 13.9V PIN 9 = 3.7V
PIN 3 = 3.9V PIN 10 TO 18 = 3.3V
PIN 4 =3.3V PIN 19 = 8.9V
PIN 5 = 3.3V PIN 20 =7.8V
PIN 6= 3.3V PIN 21 =0V PIN 22 0V
PIN 7 = 3.3V PIN 23/24 = 3.3V , PIN 25 8.4V PIN 26 =15.V , PIN 27/28 3.7V

Appriciate your help.

Thank you
 

Don Anton

New member
Just add this. There is no short in PPBUS_G3H. How ever ISL chip getting hot with our the battery. When the battery connected no boiling on U7000.
 

2informaticos

Administrator
Staff member
Pins 19 & 20 should have 5V, generated by ISL6259.
You have higher voltage there.
Change U7000 again and check all solders.
Also change Q7085 and check if Q7030 is OK.
 

Don Anton

New member
Hi, THank you for your help. I get pin 19 20 5v when the battery connected. Replaced ISL 2 times.And also replaced Q7085
 

2informaticos

Administrator
Staff member
You must get 5V on charger too.
Pin 2 voltage makes me worry; is too low.
Post voltage on both pins of R7005; be sure it has correct value, 20 ohms.
 

Don Anton

New member
yes. but I dont get 5v on charger. R7005 was 40 ohms and pin 2 was 16v and pin 1 was 13v. I replaced the R7005 and C7005 now I get 15v on pin2 but still 3.7v on both side current snce resistors
 

2informaticos

Administrator
Staff member
Post again U7000 volatges; pins 1, 2, 3, 9, 12, 13, 14, 15, 17, 18, 19, 20, 26, 27, 28.

"check if Q7030 is OK"
???
 

Don Anton

New member
Hi THis is solved. I found R7005 again given me 13v. I replaced the ISL and R7005 both to gather. problem solved. Thank you so much for giving me advice where to check. You are a legend.
 
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