I finished building my QMX kit today.? On initial power, it started correctly in the bootloader mode.? I could load version 1_00_009, restart, and hear audio blasting out of my headphones (a good thing I did not have it on my ears).? I tried to lower the volume, but the QMX would not reduce the volume.
I pulled apart the control board from the main board.? I thought I might have an open connection on the encoder.? I did a visual inspection, and it looked like the common point for the encoder contacts was not connected.? I used a cut lead from another component to bridge the gap from the board to the ground pin for the encoder contacts side (not the push switch).
Put it back together, and now it will not start.? If I hold in the on/off encoder switch, my power supply registers 2ma as long as I hold in the encoder.? There is no backlight, so I assume that the processor is history.
I did pull apart the boards several times.? I did a visual inspection with a microscope.? Check the operation of the control board using an ohm meter.? The next step would be to do the buck converter tests.? I have little hope for the kit.??
The only thing I can think might have killed the QDX is how I turned off the QDX before I took it apart.? I pressed the power switch on my linear supply rather than removing the power plug.? There may be a surge on powering down that the buck converter could not handle and wiped the processor.
I will set it aside for now and let my head clear.
73
Evan
AC9TU
