Where to find LG 65UQ75006LF EAX69830902 schematic and ZD1800 SOT23 zener?

Mark: LG
Model: 65UQ75006LF
Main board: EAX69830902



Hello everybody

I am looking for a schematic for the specific main board.
In case no schematic is available, does anyone know the part number of ZD1800?
It is probably a zener diode (package SOT23), but it is scratched and I am not sure about the part number.
As you can see, in the photo "17 AD2239" can be barely seen, but AD2239 probably refers to lot number.

Thank you for your time!

Have a nice day
Stavros