I agree with the crystal check suggestion......look for the simpliest things first. It is possible that the board is bad again....but it does seem you are getting some power and connection. My first tank was a heng long pershing and I had a similar problem....turned out to be the crystals were in wrong....swaped. Can you post some pics of the board and inside of the tank? Maybe one of the experts here will notice something you don't

Skitt