Zenith 19EC45 Vertical Problem?

[kx250rider]

Originally Posted by jstout66

jblmar, I do have a 9-92 AND a 9-147. PM or e-mail me if interested. And Charles, my 19EC45 seems to have developed an intermittant problem within the last few days. Once in awhile it looks like it looses all contrast (lkooks like a negative almost) and the color gets weak at the same time. If I turn it off and back on it's fine and may not do it all day. I also notice tho that the picture isn't as good as it was. It tends to bloom if the picture control is turned to the normal range. Which module should I be looking at? It used to be fine when I used it as a daily watcher, I've had it in storage about a year, and put back in service recently.

2 things pop into mind: The Chromatic switch pushbutton is famous for the loss of contrast and flashing in & out. It's sealed, so very hard to sprayclean. Try just pressing it in & out a whole lot, and see if that fixes the problem. Otherwise, the 9-88 luminance module may have loose pins. (ALL the modules get that way once they're pulled and reinstalled). The fix for that is to tighten each pin socket with a dental pick or tiny screwdriver. You remove the module, then carefully poke each side of each pin socket so that the contact tabs are almost touching eachother. That way, when the module is pushed back onto its pin headers, the pins slip tightly between the socket contacts.

The blooming, especially when you say the TV was stored for awhile, may be a slightly gassy tube. I wouldn't worry about it, as long as the picture is sharp when the contrast is set slightly down and the sharpness is in the middle. So the tube is #1 suspect, and secondly I would look toward the HV tripler not delivering enough focus voltage at times. Any corona smell or arcing???

That's step 1 anyway...

Charles