Hi Guys, and congratulations for this useful forum!
I've in trouble with a TC1 tester (version with ATMEGA324PA)
It's been broken after a check of a charged capacitor

I've check it, and I've found broken DZ2 and U1.
I've changed them, now the tester starts, but I've backlit blank screen

Can someone explain how to flash the U1?
I've already bought a USBasp-H6P interface, and I've soldered a connector to tester PCB (as in picture)
Thank you so much!