Switch doesn't power on : my repair journey

Nintendo Questions
1

Hi everyone.

Im new to microsoldering and reparing switches.

So, I’ve bought a switch that doesn’t power on : drawing 0.47A when battery is plugged in, 0.2A without it.

I checked for shorted caps on the VSYS line (around BQ) and I found nothing suspect.
Same for M92, same for P13.

So, I have few questions :

Is that normal that when I plug in the battery the CPU gets warm (not crazy hot, just warm), it seems like the battery is draining into it.

I removed the BQ chip and… 0.000A consumption and no CPU getting hot. Should I consider the problem as solved?

An other question, what diode reading indicates a short ? I have no beep on my multimeter. Is 0.171 considered as an acceptable value ?

Is it normal that I have 0.00v voltage drop on caps when battery is plugged in (so considered as shorted?).

It seems that I have a short on the cap bellow the M92 (0.075 diode reading), on this very cap :
tronicsfixforum. com /uploads/db3735/original/2X/a/a8aeb40300f3a17bc4a8073eee9527acd176327d.jpeg

Thanks everyone :slight_smile:

2

Sorry I couldn’t upload .

So the short is on this cap…

short
short1920×2706 357 KB

3

Newbie here to.

So that cap goes to the 1v8 line, from my understanding that line goes to a lot of places that could be causing the short.
the line is created by the PMIC on the back of the board, it goes by MAX77620.
if you look around the forums you’ll find the probe points for that chip.

I think the bq chip hands off the power from battery to the rest of the board so taking it off means that the board is no longer getting power anymore from usb or battery.

The gist is, find that 1v8 short, also i think warm SOC is considered normal from what ive read, but warm to you might be different to me if i touched it