jbeary
02-16-2007, 12:30 PM
Hello All,
I have a Zenith Chromacolor 14DC15 that I really need help with. The problem is horizontal sync. It's intermittent and get's better after it heats up. I've swapped out the 6U10 with three others which all tested good. Then checked the obvious, the diodes and have been grasping at straws with checking and replacing resistors and capacitors in the horizontal circuit. I don't think it's the diodes because I figure that the set would never lock into sync if one were bad. I've been looking more at the tubes as well as the resistances. Now that all of the voltages and resistance measurements check okay, I'm freaking out. Anyone have any ideas? I've checked most all of the tubes and can't find anything weak or weird. Don't know why this would sync up after it's warm but not when cold.. sync's up but barely and the AGC knocks if out when fiddled with or the channel is changed. Generally this is a resistor or capacitor issue, but like I said, I have no idea because they all test good when cold. Otherwise, CRT tests real good and it has a super picture, just a little mis-convergence. If anyone has any helpful hints, I would be very thankful to hear from you. I'm thinking that I should replace or at least check the horizontal output tube. It's original and you guys probably already know that it's glued into place. Looks like I have good output but no sync so please let me know if you have any ideas. Could this possibly be an electrolytic as well? All of these seem okay to me as it was brought up slowly!
Thanks,
Jeff
I have a Zenith Chromacolor 14DC15 that I really need help with. The problem is horizontal sync. It's intermittent and get's better after it heats up. I've swapped out the 6U10 with three others which all tested good. Then checked the obvious, the diodes and have been grasping at straws with checking and replacing resistors and capacitors in the horizontal circuit. I don't think it's the diodes because I figure that the set would never lock into sync if one were bad. I've been looking more at the tubes as well as the resistances. Now that all of the voltages and resistance measurements check okay, I'm freaking out. Anyone have any ideas? I've checked most all of the tubes and can't find anything weak or weird. Don't know why this would sync up after it's warm but not when cold.. sync's up but barely and the AGC knocks if out when fiddled with or the channel is changed. Generally this is a resistor or capacitor issue, but like I said, I have no idea because they all test good when cold. Otherwise, CRT tests real good and it has a super picture, just a little mis-convergence. If anyone has any helpful hints, I would be very thankful to hear from you. I'm thinking that I should replace or at least check the horizontal output tube. It's original and you guys probably already know that it's glued into place. Looks like I have good output but no sync so please let me know if you have any ideas. Could this possibly be an electrolytic as well? All of these seem okay to me as it was brought up slowly!
Thanks,
Jeff