820-01521 A1932

[2informaticos]

Overvoltage through Q7660 damaged something on the 5V_G3S power rail.
Inject 5V there and check with IR camera if any components gets few degrees more than the others connected to the same rail.
You may need to wait several minutes, hoping this may help.
Resistance to ground is not too low, dificult to find the culprit; unless something enters into thermal avalanche.

 

[TBFix]

Hi thanks for your help, only thing that stands out is around U2120 ,the 4 resistors feeding it get to 30c with 5v injected at L7670. Strange thing is boardview shows the ic but pdf file will not find it. Is there a 820-01521-A version of schematic?

 

[2informaticos]

Inspect audio board/flex for corrosion.

 

[TBFix]

I made some progress. I changed u7650 now getting 100ma then goes to 900ma then cycles back down to 100ma . If I leave it then it starts charging the battery and goes to 2 amps. Another short somewhere ?.

Inspecting audio board now, again thanks for you input its greatly appreciated.