AsRock B560 Pro4 Possible Short on +1.8VSB

[zklgfs]

Hi,

I have an AsRock B560 Pro4 (boardview: https://www.badcaps.net/forum/troubl...pro4-schematic) that's completely dead (it doesn't even turn on the power supply when the power button is pressed or the power button pins are shorted). I do get about 3.4V on the power button pin, but 1.8VSB isn't there. The resistance to ground on the inductor PL53 is only about 0.1-0.4 Ohms. Am I correct in assuming that there must be a short to ground on 1.8VSB, or is there a different reason why the resistance could be so low? I don't have a thermal camera, but I do have a power supply I could use to inject voltage if needed, so I could maybe use the trick with watching alcohol evaporate more quickly on hot components, I just wouldn't know where to even start looking. Does anyone have suggestions what I should try first?

Thanks in advance for any help!

[zklgfs]

Hmm, after looking around a bit more, I have a suspicion that the PCH is shorted, in which case I unfortunately won't be able to fix anything. I guess I need to inject voltage to see if it heats up. According to some videos I saw, if I put isopropyl alcohol on the PCH while injecting voltage, and it evaporates more quickly in one spot, that probably means there's a short. Should I start with a voltage of 0.8V or so to be on the safe side, or can I just go straight to 1.8V?