Whilst in the MAKERbuino, I believe the MCU is talking to the display but the display isn’t displaying…and here’s why:
Originally when testing MCU with LCD and arduino, I saw these two screens (they cycled together):
But this is what @Gemberkoekje saw:

I then removed the MCU from the arduino and put it into the MAKERbuino. I got a start up chime and no display (aside from the controllable backlight). I inserted the SD card randomly. I restarted and got the startup chime and no display. Pressed button A then B and C out of fustration. Turned power off and on again. Still no display. But, hey, now no startup chime.
I put the MCU back into the arduino to see what the LCD was doing and now I see this:
So put the MCU back into the MAKERbuino. Still no sound or display. Pressed some buttons randomly.
Put the MCU back into the arudino and now I see:
Put back into the MAKERbuino…still no sound or display. And then I realised, no sound because all I was going to get was a startup chime and the chip already thinks I’m past that point each time I power on. It’s remembering where I left off each time.
I decided to try to reflash the MCU in the hopes of starting things off fresh. Doesn’t do it. Is the bootloader set to not allow a reset perhaps?
BTW, each time I placed the MCU into the arduino I ended up pushing the reset button on the board and perhaps that advanced the setup process? Or maybe that was just due to my random button pushing each time the MCU was reinserted into the MAKERbuino.
I have no clue why the display won’t show on the MAKERbuino aside from potential soldering problems or a faulty screen, but it clearly works via the arduino/lcd/breadboard/MCU environment. I’ve checked the solder joints a bunch of times. No bridging. Looks like good contact.
Out of interest, when I was testing the display via arduino with it’s usual chip (not with the Gamebuino bootloader on it), I noticed that I could only get text and animations to display if it was given 5V from the arduino board as opposed to 3.3 V. Does this suggest a fault with my LCD?
Regardless of the MCU status, I can not get the display to work with the MAKERbuino. Any suggestions?
@albertgajsak I’m happy to try a new MCU. I’m happy to try a new LCD. I’m happy to start all over again with a new kit. Or if you have any other thoughts on where to go from here?