zenith 20bc50 problems

[daduke]

well replaced the resistor blew again checked all my capacitor hookups everything was fine. traced out everything and i think there's something wrong with my focus section. this kinda makes sense before the set died the focus would be out for the first 5 minutes the set was on, and would swing in and out while playing. i just figured it was moisture or something as it would crackle and hiss for that first few minutes and would stop after the focus had come back. point is there anything known for going bad in the focus sections on these televisions and would the focus affect the hv at all? since that seems to be working.