There is a field of capacitors on the power board that usually goes bad. I believe that there is a total of 6. When you look at the power board you should notice them. I have the capacitors if you need them. $2 each. Just check to confirm that they are swollen. and let me know the voltage and uF. good Luck. David

Along with the capacitors check the transistors for discoloration as that is probably why it turns on and off continuously. I found 4 bad capacitors and 1 bad transistor on my power supply board.