820-2936-b not power

[tipoti]

hi,

I saw that the PP3V42_G3H line was short circuited. U7000 was short I changed it. There is now a green light but it does not turn orange and the battery is not charging. Device does not turn on

PP3V42_G3H :3.4 v
PPVRTC_G3H : 3.3 v
PP5V_S5 : 5v
PP5V_SUS : 5v

 

[2informaticos]

What is exact PPBUS_G3H voltage, w/ and w/o battery (charger connected)?
Check resistance (ohm scale) between pins 17/18 and 27/28 of U7000.

 

[tipoti]

PPBUS_G3H : witoutbattery 12.25v
only wity battery 11.25 voltage


17/18 : 3.4 ohm
27/28 : 20.7 ohm

 

[2informaticos]

"only wity battery"
I didn't asked that.
I expected the second reading with battery AND charger connected (as above mentioned).

Looks like no good communication through battery bus.
Check voltage and diode mode to ground on its SCL/SDA lines.

 

[tipoti]

same in both cases PPBUS_G3H : 12.25

SCL: 0.510
SDA : 0,526

SCL: 3.4 Voltage
SDA: 3.4 Voltage

 

[tipoti]

I cleared the u2800 zone and the device turned on. But it doesn't turn orange. The best known battery. the device continues to work after unplugging the charger

 

[2informaticos]

Battery percentage is showed correctly?

To charge the battery, you must get correct PPBUS_G3H first; 12.6V without battery.
Check R7000 first.

SCL/SDA difference in diode mode looks bad; should be less than 1% normally.
Remove D6950 and test again.