Looking at the board I take it that it's a heng long 1/24 tank? I have 1/24 vstanks I would open up and take a look , but most if not all have cable plugs and are not soldered to the board, so if it is Heng Long then I don't think I can be of help, but I'm sure there must be a schematic for it somewhere on the net. Good luck.
Greg