820-01958-A not coming up

Soji

Member
The board came in dead, no corrosion
The ammeter shows 5v and restarts
PPBUS_G3H=12.32 but pulsing
PP3V3_G3H=3.3v pulsing also
PP5V_g3s=not present
PP1V8_G3S is short sometimes it's not
I replaced Q8270 after I found out its getting hot on thermal camera still the ammeter shows 5v and restart
 

Soji

Member
The board did not enter DFU
L7670 pin1=0.419,pin2=0.418
0.019volts
L7690 pin1=0.386,pin2=0.386
3.3volts not stable
L7030 pin1=0.444,pin2=0.444
5.0volts not stable
 

2informaticos

Administrator
Staff member
What's the reason to check both pins of a coil?
Do you really expect to get different values???
Put some logic and save time on your job.

So no pulse at L7670?
 
Last edited:

Soji

Member
PPBUS_G3H is stable when battery is connected but restarts when the ammeter restart and
3v3_G3H_RTC is stable but restart when the ammeter restart and U7800 voltages too
 

2informaticos

Administrator
Staff member
Test the board alone on the desk; nothing connected apart of charger.

Check diode mode to ground and voltage pulse on ALL board's coils.
 
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