Enzo have you installed the Firmware yet?
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73
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Ian G4GIR
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----- Original Message -----
Sent: 12/09/2023 14:32:16
Subject: [QRPLabs] #qmx Power not staying on after Q103-Q104 fix
Folks,
my QMX had the Q103-Q104 issue. I managed to unsolder and move Q103, and now the short has disappeared. I also replaced D101 with a THT one (it went off at first power-on, I had not checked for the short beforehand, my fault!), and I put a wire to connect the two sources? of Q103 and Q105, as the pad of the source of Q103 did not survive the surgery.
Now the continuity tests work as expected. The problem is that the PCB does not stay turned on. If I keep the left button pressed, the CPU boots and I can see the device appearing as a USB drive, but it powers down when I depress the left button. My impression is that Q104 might be the culprit, but before replacing it I wonder whether anybody has seen anything similar? I have read through the related topics in the reflector, and I don't seem to be able to find a specific answer there, hence this post.
Thanks in advance
72/73 de Enzo M0KTZ
