I was wondering if anyone could advise if I have gone the right route for diagnosing my laptop (Acer Helios).
I have attached the schematic.
The laptop was not turning on and there was no signs of power.
I injected voltage at the power input and measured the motherboard under a thermal camera. PU4501 was getting hot. I gather that PU4501 is the converter creating the 3.3v and 5v power rail.
I removed PU4501 and noticed a short on the 100K resistor on pin 7.
I injected voltage at the resistor and measured heat coming from U3801 and U3802 which I believe are the USB controllers.
From there I measured a short on resistors C3812 and C3801. When injecting voltage there, the chipset got hot.
I therefore gathered that the chipset is kaput.
Am I right? What would your approach be?
Thanks in advance.
bios-fix.com_WistronGhibli_CFSrsc0328_18803 scheamtics (1).pdf (6.1 MB)