It's Two steps forward and one step back...
Solved the booting error with midi cables attatched.
The error at boot was caused by a setting in my midi controller. Some kind of loopback happened
caused by the MidiTo setting in the novation sl25. It should be set to u1 only, no m1 or m2 with this.
I noticed a spit out of hex code in the midi monitor on the laptop. And thought of changing the setting on the controller.
Works fine now.
Beside that with all the the checking and measuring, I forgot to shut the power down before removing the top pcb with display.
Now there's only a block on it... probably fried the display interface part of the PIC. When I switch PIC's with a fresh one
the screen is online again, but still no backlight :( ...man i really need to start thinking instead of moving parts around...