I have a 51mp392/h17 tv. I replaced the

I have a 51mp392/h17 tv. I replaced the convergence chips and the resistors. At first, I could not adjust all the color bars. Went back and found a terminal not soldered. Fixed that but when trying again all I got was the popping sound when the tv was powered up and then when it stopped. Did this repeatedly. I checked on this site and others to find possible causes. The picture would not come back on before but now it will come on when I plug it in after being disconnected for a few minutes then goes back off with no popping sound. I have checked the pica fuses and they are good. What can possibly cause this problem.