SMBUS_CHGR_SDA no pulse

[DavutAmana]

Hello,
I have this board 820-2879 that I persisted in repairing ...

It works on battery
On charger it supplies 2.6V on PPBUS_G3H

SMBUS_CHGR_SDA do not pulse
SMBUS_CHGR_SCL pulse

I replace R5280, U7000, D6950

I think it is a faulty SMC but I want to know your opinion before putting in the trash.

I'm not familiar with how these old board work ....

Thanks in advance for your help

 

[2informaticos]

Why bad SMC, if board works on battery???

Do you get 3V42_G3H with charger alone?
Post U7000 voltages in the same case; pins 1, 2, 3, 9, 12, 13, 14, 15, 17, 19, 20, 27.
Check resistance between pins 17/18 and 27/28.

 

[DavutAmana]

Thanks for your help
I think bad SMC because it does not provide the pulse of SMBUS_CHGR_SDA...

PP3V42_G3H 3,41 with charger & with battery
U7000 pin :
1 0v
2 0v
3 4,7v
9 3,8
12 3,41
13 3,41
14 2,26
15 0
17 2,6
19 5,06
20 5,06
27 20v

17/18 resistance : 2.8 ohm
27/28 resistance : 20.1 ohm

Thanks

 

[2informaticos]

"2 0v"
How do you get 5V at pins 19 & 20 then?
Check R/D7005, just in case.

"9 3,8"
Did you check resistance directly between pins 27/28???