wow, that’s weird. Backlight is working and the ATMEGA is able to control it - it is on when in test mode.
What do you mean by “flashing the LEDs” - does it look intentional (I mean like for example 1Hz 50% duty cycle) or unintentional (like in my example ~0.1Hz and ~100ms flash)?
I will try to add few 1uF caps to 5V rail to each chip. It hurts when I see the super thin +5V copper trace. And the minimal copper pour clearance… why?!
I wonder if there is a way to identify the moment when ATMEGA restarts itself. When for example watchdog is activated - is the RST pin internally puled down so it is measurable?
My TODO list:
- Add more decoupling C
- Route +5V directly to ATMEGA with a wire
- Try the other FW - HelloFriend.bin
- Change R35 and R46 to 200k exactly
- Desolder and meassure al FETs