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You were absolutely right about checking the MCU. There was a blob of solder shorting the connectors of the Atmega. You can see it clearly in the last two pictures. I removed the blob, but that did not change anything, unfortunately. I hope I didn't ruin anything
Right after boot up, the LCD screen looks weird (see picture below). I can see some reaction to button presses, and sometimes it is even readable. I checked all connecions between LCD and main board and resoldered them, but that didn't help. I measured all voltages as per the assembly guide, and fou...