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

[Don Anton]

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.

 

[Don Anton]

I mean with out.

 

[JohnB8812]

If the ISL is getting boiling hot that would be a good suspect to replace...

 

[Don Anton]

hi John I did replace ISL twice ..

 

[2informaticos]

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]

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]

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]

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]

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]

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.