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TC1 lcr-meter transistor-tester fix

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Glide:
I remove U2 (10A45 on the chip) and now is stuck on "Testing...". It seams that I'm getting somewhere:)). Any other suggestions?

madires:
What happens when you check a resistor?

Glide:
Nothing, is not getting unstuck from this state. Only if I disconnect the battery is shutting the screen off, otherwise is staying like with that message on forever.

madires:
That points to a broken MCU. If your tester has a genuine ATmega you could replace it and flash one of the two OSHW firmwares. Possibly you need also to reflash the control MCU or replace it with a simple two-transistor circuit.

Nokeshas:
Hello, well i have tried lots of things...
Last one - flashed with avrdude 3.3 original firmware, but i get just short light up of display and nothing else. |O
verified lock and fuses all ok, eprom and firmware also verified ok, but still nothing on the screen just short splash of lcd backlight and thats it...  :-//
my tc1 has atmega328p so in config everything selected fine i think.

fuses
EXTENDED = 0xFF (valid)
HIGH = 0xD7 (valid)
LOW = 0xFF (valid)
lock
LOCKBIT = 0xC0 (valid)

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