2022 Asus ROG Flow Z13 I7-12700H dead troubleshooting

[elitebooker]

Hello everyone,

Im by no means an expert, just an electronics student and my tablet-laptop died. I got it in Oct. 2024., and was having slight issues with the device, not being able to get display to show on iGPU from sleep, or sometimes it wouldnt show sign of life for no reason, a fix would be to plug the original charger into another dell,hp,macbook, then plug into my device, it would boot, or by multiple times holding the power button. The power peoblems stopped, but then started issues where it wouldnt show a display even after a fresh boot (ALL THIS WHILE MUX SWITCH IS ON IGPU) if the MUX was on the RTX 3050, it works fine. i thought maybe the flex cable for lcd was cracked, checked it, and one time, after i unplugged the lcd flex *while battery was connected* it wouldnt show a sign of life. An LED is present near the USB-C charging port, never shined light after that. There is absolutely no sign of life. HOWEVER, when the motherboard was out, i noticed that when it has power, there is coil whine - WHEN I put a finger on the touchscreen, or the power button that has a fingerprint reader on it. I opened a .cad BoardView for the same model board, but with higher-spec I9 and 3050 Ti, but i dont know what to do with it, i wanted to check stuff with multimeter but dont know where to start... Can anyone help diagnose?

[Sephir0th]

I don't really like to be the one who tells you what has likely happened, but someome need to be the one who says what everyone else thinks:

With the "bad move" of playing with the display connector while the battery was still connected you have most likely fried the Chipset. If so, the board can not (easily) recovered from this mistake anymore... but one step after another.

We need a detailed overview of all easy accessible power supplies (coils), present voltages (while pressing the power button) and resistance to GND of each single power supply (without power). And then we will most likely know more.

[DeXXter]

Yeah I've heard that "coil whine" noise you're talking about, usually when they got the pch (chipset) shorted/burnt. As the other user say, you probably shorted the B+ (battery voltage) onto a pch data line burning the fhck out of it while yanking the fpc connector. The only solution here is to replace the pch and since this is a 12th cpu, you will need the entire thing cpu+pch together (more expensive). As for the previous failure, that might have been an issue with the igpu power supply itself.