Update:
Visual inspection showed that Q108 was broken as it had its case cracked. Cannibalized another unbuilt QMX+ board and replaced it. Measured and found D108 shorted and replaced it as well. Now with PSU set to 7.5v and current protection set to 350mA I dared to test to start the QMX again. Now it starts up but it¡¯s quickly visible that some voltages are not right as the contrast is way to high on the LCD. So I quickly unplugged the power. (For a brief part of a second the display shows the startup information correctly before turning black probably as the 5v? rises to too high. Maybe the SMPS regulation isn¡¯t working)
Open and greatful for further ideas on how to continue troubleshooting ?
Jonas - SM4VEY
