First off Ludwig a big THANKS for all your help.??
I had some limited success today.? I remembered that when It did show up as as USB drive I started the firmware load but the USB Drive went away as? soon as the copy started.? So I thought maybe it had a partial load of the firmware.? I used the jumper to force the firmware update and it WORKED.?
I was able to see the QMX USB drive and it did not fail.? I copied the firmware and the QMX rebooted.? But the display never showed any activity and the back light did not come on.? But the QMX seemed to be booted.? It was drawing only about .25 amps and was not getting hot.? I checked the voltage at PCB#1 and PCB#2 and I had voltage at +12V which is only available after power on,? Vcc had about 3V and Vdd was about 2v which is low but seems to indicate it was partially working. PWR_HLD had about 2v, again low but it showing that something was working.?
I shut it down and re-flowed the solder at the PINS for the Display.? Booted it back up but still no display.? I tried the Jumper to force a boot and it came up as a USB Drive again.? I then shut it down and took a break.? When I tried to power it back on pressing the Left Encoder did not power it back up.? I had no current draw at all.? This is what I was seeing when I first tried to power it on at first build.? I checked the Vdd with all the cards removed and it is now only showing 2 Ohms so the STM32 seems to be dead again.? ?This was back to where I started this debug process.??
Also, a few days ago it was doing the same thing, when the Left Encoder was pressed the voltage would show a slight drop but the QMX had no current draw at all.? Then without doing anything after sitting a few hours I tried it again and it would start to draw a current and get a little warm.
It seems I either received a defective STM32 or I damaged something during my build process.? ?
I have ordered another kit and will give it another go hopefully with better results.??
Again thanks for all the help and support.??
Bill
