Hardware Nintendo switch unpatched charges partially

[Aquarys]

Hello everyone

Motherboard bought 100% ok on e...Y turns out that in fact no so much...

Indeed the console docks, "charges" in both orientations, but i noticed the percentage of charge was staying at the same level for hours
I tried to drain the battery and recharge it overnight, but unfortunatly it stayed depleted. I had to replace the battery with a known good one

Same behaviour

Here are the amp values :

ON : 0.5A
SCREEN OFF (idle) : 0.38 A (then goes to 0, and somes sec later back to 0.3A and so on...)
OFF : 1A

My only solution now is to power off the console manually after being plugged to let it charge

Voltages


BQ chip pin 1 : 15V
M92
9 : 15v
21 : 21 v
22 : 15v
5 : 3.3v
6 : 3.3 v
38 : 1.5v
39 : 2.8 v
40 : 1.5 v

Any idea ?

Do you think it is the fuel gauge ? Any way to software reset it via RCM app ?

Just noticed under the RCM menu "battery" :

Battery temperature is 87°C !! I tried to measure the 2 resistors in circuit near BQ chip, values (battery removed are compliant 5.6k & 3.8k)



thanks !

 

[Aquarys]

I tried to replace the fuel gauge chip by another one (know good) now th console do not power on anymore

No shorted cap anywhere after analysis

Even trying to replace the 'original" fuel gauge, same beahivour, i might have burnt something

any lead on how to test ?

thank you