@Wolfgang, your soldering joints look super-duper, congratulations!
Hmm… this is quite unusual, I am not sure what went wrong with your build.
Did anything show on the screen when you finished build guide’s step #12?
I’d suggest you to send your console to our address:
Maksimilijana Vrhovca 11,
You only need to send us your circuit board.
I’ll personally fix your device and get it sent to your address ASAP.
Thank you for your patience and understanding