When I took it apart I saw the date stamped 2007. Anyway I'm not getting the transmitting unless I hold the throttle all the way up. Need to go back inside. And probably call service as well

I took it apart and cleaned the contacts on the back of the board and got it working.

I turned on the controller and the screen stayed blank. I tried some new batteries and it is still blank. It is less than a year old. any suggestions?