ASUS G14 GA401QM No CPU Fan RPM

[ResoluteHawk]

Re: ASUS G14 GA401QM No CPU Fan RPM

Does anyone have any other ideas?

[ResoluteHawk]

Re: ASUS G14 GA401QM No CPU Fan RPM

I may have found the culprit of the problem.

There is a straight short between two of the pins on the fan connector for the CPU, specifically the 12VS_5VS_FAN0 (Pin #4) and FAN0_PWM (Pin #3). The CPU fan connector itself looks perfect. The pins are all aligned properly and the inside of the connector is not damaged either.

I checked the continuity between those same two pins on a known working G14. The same 2.0V drop is present.

What could cause this short to happen if the fan connector is not damaged at all?

Is the only way of fixing this to replace the EC?

UPDATE (about 10 minutes later): I checked the same two pins on the CPU fan connector again and I'm getting 2.0V drop.

I did re-measure each of the pins in diode mode again however.

Problematic board (FAN UNPLUGGED)
Pin #4 (12VS_5VS_FAN0) : 0.529
Pin #3 (FAN0_PWM) : 0.811
Pin #2 (GND) : 0
Pin #1 (FAN0_TACH) : 2.646
Voltage drop across R5002: 2.614 (in circuit)
Resistance across R5002 : 9.87K (in circuit)

Known working board (FAN UNPLUGGED)
Pin #4 (12VS_5VS_FAN0) : 0.530
Pin #3 (FAN0_PWM) : 0.824
Pin #2 (GND) : 0
Pin #1 (FAN0_TACH) : 0.781
Voltage drop across R5002: 1.54 (in circuit)
Resistance across R5002 : 9.92K (in circuit)