Charging problem NM F331 (KS485)

[tusz majster]

Hello.

I'm asking for help solving a battery charging problem.
There was a short circuit in the power supply section of the motherboard (a damaged PC5015 capacitor). After replacing it, the board boots correctly and the operating system runs.

Unfortunately, the battery isn't charging. The PQ 5402 gate voltage drops to 0.8V, and the same voltage is present on the PR 5435 coil.

SMB_SDA / SMB_SCL from the PU 5400 chip is 3.3V.

BOARDVIEWER is available on the forum.

https://www.badcaps.net/forum/troubl...rdview-nm-f331

[reformatt]

Main power rail shorts usually also damage the first input power MOSFET which will disable charging. Check PQ105 and PQ100. I uploaded the schematic for this board onto that same thread.

[tusz majster]

Thank you so much for your help. Of course, your suggestion was 100% accurate. It was specifically about the PQ 5400, which was punctured, but you guided me perfectly!