Midiboy not working (no image on display): how to troubleshoot?

[Giedrius]

Hi Martin, this could be caused by a physical assembly issue on the board itself, please double check the marked areas in this post:

USB Device Not Recognised

Thank you for providing the pictures. Unfortunately I didn’t spot anything obviously wrong. Just in case, check this picture out: [image] The components enclosed within the orange outline are critical for USB communication, as well as the 3 pins marked with light green dots. Please double check whether the solder joints on theses components are indeed fine (they do look fine from the picture, but maybe looking at them at an angle could reveal something). Also, double check if the microcontrol…