tv repair for proscan 32la30q no power going from main board to light board

I have a proscan 32la30q  tv that I have changed the capacitors on the main board out.  There is still no power going to the board that control the lamps or lights in the back.  I know the TV is working.  Have place a hand held light and there is activity on the screen.  I am searching for a repair manuel that can tell me the output voltages from the main board to the other boards.  If it is not a bad capacitor what else do I need to look for to see why there is no power to the lights.