Hello all, I¡¯ve just finished building a low band QMX. I plugged in to a 7v supply, plugged the USB into my Windows 10 laptop, and (as is supposed to happen) nothing happened. I pressed the left rotary encoder and Windows recognised the USB device. A dialog came up, asking what to do with the USB, and (I think) I clicked ¡®open folder and view files¡¯. I had already downloaded and unzipped the firmware (1_00_017.QMX) and I dragged that into the QMX folder. The file seemed to copy, but then nothing else happened. Pressing the left rotary encoder does not turn it off, so I unplugged it. If I then turn it back 'on' by pressing the left rotary encoder then I see about 200 mA current, but the screen stays blank with no backlight. I tried connecting with PuTTY and I get the following:?
Supply voltage: 7.1 v
3V3 SMPS
Frequency: 116666 Hz
Status: SMPS
Voltage: 3.35 V
Duty max: 51%
Duty cycle: 44%
5V SMPS
Status: Error
Voltage: 2.76 V
Duty max: 77%
Duty cycle: 77%
Does the fact that I see something in PuTTY mean that the firmware is successfully installed, so can rule out failed firmware installation as the cause? I¡¯ve tried re-installing the firmware a few times, and tried v. 16, but always get the same result.?
If its not an issue with firmware installation then what¡¯s the likely cause? I¡¯ve re-checked the joints between the main board and the connector pins on the 5V SMPS with a DVM, and I¡¯ve checked all the other connector pins. I¡¯ve also checked for the short between Q103/Q104 though that doesn¡¯t seem to be a problem (it¡¯s a Rev3 board). Is it alive or dead? Any suggestions welcome!
Thanks, Alex / 2M0YMA
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