820-01987 dropped. Switches to 19v but pulls little current

The SOC U3900 is the only thing running. Soft glow in thermal.

L7690 3.3v is stable
L7670 5v comes on for a few seconds then fades away. Repeats.
L7030 12v comes on for a split second then fades away. Repeats.

None of the other rails appear to come up.
No rails shorts found.

What is SOC "system on a chip" I assume. what does it do?
 

2informaticos

Administrator
Staff member
SOC is the T2 chip in this case.

There are other G3S voltages; check if all come on at same time with 5V_G3S.
There should be some broken trace, or solders; maybe under BGA chips.

Did you test if enters DFU mode?
 
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