Thread: Asus FX505DT
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Old 11-30-2021, 04:28 AM   #4
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Join Date: Feb 2020
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Default Re: Asus FX505DT

I've just had one of these boards machines come through. The power adaptor immediately shuts down when connected.

Located the fault with voltage injection and thermal camera. The area in question by the OP is for CPU Vcore, and in my case was the AOE6932 dual FET to the left. Only one of the internal FET's had shorted, the other was ok. I usually find a dead CPU at the end of this scenario. The CPU measured a little over 1.2 ohms so I was not confident. But at least it wasn't a dead short. I didn't have a replacement at the time, so I took it off the board and saw what the other phase would do. Surprisingly I got 1V. Machine wouldn't fully start because of the missing phase, but there was hope.

So ordered it, and finally fitted the replacement AOE6932 today and machine is working fine. I have to assume the FET that shorted was the low side FET, not the high side as the CPU survived. I took the liberty to measure some volts on the coils for future reference. A little over 1 ohm seemed a little too low fpr Vcore, but there you go.
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