From my electronics knowledge i can suggest testing the following things:

If the PSU has TVS suppressor diodes somewhere on the output, they can become conductive because of an overvoltage event, and also emitt the classic burning smell, but don't go bang. So you can not visually see if they are damaged. The often somehow survive such events, tough significantly degrading their standoff voltage, so they will conduct even at or far below the rated voltage.
So i would suggest testing all the diodes on the board with the diode test-function of your multimeter. A caviat on the output...

Thanks for your answer.

Yeah, i wanted to avoid that. Because those capacitors will be underneath the huge heatpipe and cooler assembly. I tried removing all the screews of this assembly an trying to lift the cooler from the motherboard. No chance. Its somehow stuck. Maybe because of the huge area of thermal pads all over. But I also do not want to force it, maybe it is somewhere still mechnically fastened down, and destroy the whole thing for good.

So the easiest would be, if somebody has the same laptop and could have a look what HWInfo says on his machine.
...

The WLAN module is working again.
A Load Switch named KAN18 directly in the vicinity of the WLAN M.2 slot has gone high resistance.
I bridged the switch, suppying 3,3V to the M.2 Slot and the WLAN module. The WLAN and Bluetooth work now flawlessly.
I don't know how the fault on the display propagated to and killing Load switches all over the board.
But with this quick fix, the laptop is pretty much in complete working order.

The last question which remains, is the bus width of the Nvidia graphics card. It is still reporting to be x16 capable but only runs...

Booted a live Fedora image. The WLAN and BT are also not found under linux.
Therfore it leaves only the hardware as the source of the problem.
I'll investigate further this evening, maybe i find something. If so, I'll let you know...

I measured all the EC-Chip lines, and everything looks good i think. I Used the GM7MxxP schematic for that because for GM7Rxx that i have i found none. But i assumed that the EC-Chip pinout would be mostly the same regardless if an Intel or AMD system

Laptop was laying on its top to access the EC chip for measuring, so the Display was closed, so also all the backlight enable signals make sense. Battery was disconnected, BIOS battery was disconnected, laptop was only supplied by AC adaptor...

I'm interrested, if this behaviour is normal or there is a more severe fault/damage.
As i wrote, everything else works on this laptop. And it is working stable, no bluescreens or sudden shutdowns.
I also assume, that the shorted LCD Panel has not damaged any other components, like the chipset and GPU itself, because the new display panel works just fine without any signs of problems. Also the Webcam, which is on the same EDP cable as the display itself is working. So my thought is, that if there was high voltage feeding back from the shorted panel on the data lines of the display...

Hello everyone,

I am troubleshooting a Schenker XMG NEO 17 (M22), which is based on a Tongfang chassis (likely GMxRGxx series, 2022 model). Specs: AMD Ryzen 9 6900HX / NVIDIA RTX 3080 Ti (16GB).

The Incident: The original LCD panel developed an internal short circuit (measured shorts across almost all rails on the panel side). This caused a catastrophic failure in the backlight circuit on the motherboard:

• The backlight fuse was blown.
• The P-Channel MOSFET which switches the 19.5V backlight rail was destroyed. Measured nearly 0 Ohm between Source and Gate and 240 Ohm

...