Hi all,
I have an Acer Nitro that came in with no power. Under a thermal camera, I could immediately see the ACFET cycling on and off.
The gate voltage was fluctuating below 1v. I then replaced PQB13 (charge controller IC) but it was still the same.
At this point I noticed the signal back to the ACFET was shorted to GND. It turned out the entire 19v rail read ~3ohms.
I eventually traced it to the GPU power rail. If I remove the coils ahead of the GPU 1.35v rail, the short is isolated to the GPU region and the ACFET gets a full 25v at the gate.
My question now is, is there anything else I can do here to chase this, or is it probably just a bad core? I'm new, so bear with me if this turns out to be something super obvious. I'm making this up as I go lol
Schematic and BV in this thread:
[MOD EDIT] https://www.badcaps.net/forum/troubl...atic-boardview
Thank you!
I have an Acer Nitro that came in with no power. Under a thermal camera, I could immediately see the ACFET cycling on and off.
The gate voltage was fluctuating below 1v. I then replaced PQB13 (charge controller IC) but it was still the same.
At this point I noticed the signal back to the ACFET was shorted to GND. It turned out the entire 19v rail read ~3ohms.
I eventually traced it to the GPU power rail. If I remove the coils ahead of the GPU 1.35v rail, the short is isolated to the GPU region and the ACFET gets a full 25v at the gate.
My question now is, is there anything else I can do here to chase this, or is it probably just a bad core? I'm new, so bear with me if this turns out to be something super obvious. I'm making this up as I go lol
Schematic and BV in this thread:
[MOD EDIT] https://www.badcaps.net/forum/troubl...atic-boardview
Thank you!
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