It may or may not be Q104. I had exactly the same issue/symptoms on a
QMX that had firmware loaded. Turns out I had blown the PWR_HOLD port
on the MPU. I had to hardwire Vdd to the gate of Q104 to get it to
stay up. It won't shutdown now as PWR_HOLD is permanently on. It hangs
at the "Shutdown" message and I simply pull the plug or switch the
power off. Not saying your issue is the same but you can check by
measuring the voltage at the gate of Q104 while the left encoder is
down and again when it is released.
-mike/w1mt
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On Tue, Sep 12, 2023 at 9:59?AM Enzo M0KTZ <m0ktz@...> wrote:
No I haven't. I was under the impression that you didn't need to keep the left button pressed to load the firmware. Or at least this is how I read the assembly manual. Please accept my apologies if this in incorrect.
If I press the left button momentarily and release it, the board shuts down. That's the issue HI.
72/73 de Enzo M0KTZ
