Hello! I've finished assembling my new QMX, it only being my second such project after the Morserino-32 morse learning device. Once I plugged the QMX into a variable power supply, I was delighted to see it seemingly powering on and off as expected. After installing the firmware, however, I have stumbled upon a huge issue though: The display's backlight turns on, but there is not a single pixel appearing on the display. Using the QMX terminal, I was able to check that apart from this, everything seems to work for now.

Anyway, I have checked all joints and they seem to work fine. Which display pins and/or pin header connector do I have to focus on when the backlight works but the screen not at all? Which pins should I leave like that because they are already working?

Hi Colin! Yup, that's it, thank you for this simple yet perfect suggestion. There is no mention of this being a necessary step in the assembly manual. This probably should be added, having a first test and adjusting LCD contrast before putting the QMX into the optional enclosure makes sense.

开云体育

When I install that pot on the board, I turn it fully CW and then back off a bit. (fully CW, you'll just see black boxes in the display!)

Paul