Reprogramming damaged MK-328 component tester (EZM Electronics Studio)

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eyesee

Joined Oct 19, 2013
67
While measuring a mains capacitor in haste, I forgot to discharge it first and ended up damaging my component tester!

Before anyone says it, yes I know I should have discharged the capacitor first!

Anyway, I have replaced the ATMega328P microcontroller but I can't seem to find a firmware version that works? I have tried so many but nothing appears on the screen.

I have checked the regulator output voltage which appears once the button is pressed, which indicates that the firmware is running.

Photos of the tester are attached. I believe the LCD module is a 12864 soldered directly onto the PCB.
 

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