PZEM 01 Power meter repair

i had this inexpensive chinese power meter on my small solar system for about a year before it start failing. Now the screen flashes at startup and nothing more... Let's try to repair it !

[@smithyjames2857]

Hi nice work how many volts on the source should it be ?

[@ukaszw.1695]

Hi, can you give a site where you bought a zener diode? I have 4 such multimeters all damaged.

[@athulaj9319]

Do You know the U3 chip number ?

[@INISIAL_NT]

Bagaimana dengan seri pzem 025 yang hilang angka namun LED berfungsi?