Hi, my rear hub 36v cheap bike with a c965 lcd got wet after a heavy rain and I stupidly flip it over to fix something in the chain and the lcd got water inside and started malfunctioning:
-lcd backlight flickers when pressing on off button
-bike powers off ramdombly

Now, I tried to dry everything opening the lcd case a bit and with a hair dryer and the bike does not turn on anymore.

What can I do? Can I replace the controller with the newer color Bafang one? (850c) or maybe something else broke. Lcd gets 41V from the battery but there is no 5v inside near the microcontroller

thanks in advance