zenith2134
09-25-2005, 09:43 PM
This is model B1926W made january 1986, is a great tv but I think (hope) it can be easily remedied by cleaning the controls. There is a switch called Color Sentry, which is flaky. The problem is that the picture gets overloaded and blurry with extrreme contrast and color, but comes back and sometimes goes black and white. This used to only happen when the control was manipulated but now it does it at random.
I did some research and found some modules that can cause this, but do you think I can repair these boards instead of replacement? Thanks
jpdylon
09-25-2005, 11:57 PM
I had a color sentry with this problem as well. It is in fact the controls on the sentry board. You'll have to do some nasty dismantling to get it out of the cabinet, but once you do, grab some de-oxit and clean out the sentry switch, as well as any of the pre-set control pots. These are all subject to oxidization and will make trying to watch your zenith a living hell.
Also check all the ribon connections from from the sentry board. Sometimes the solder joints get weak and cause intermittant connections. Look around the video section of the chassis for the same problems.
Good luck. If you get it working, these zeniths have superrior pictures to most other sets.
zenith2134
09-26-2005, 03:15 PM
I cleaned all controls today, and the switch is flawless as are all controls. The color is excellent, but now I have a blooming problem, (which was always the case just very minor, at commercials, etc.) I really think is related to the power supply. From a cold start, the pic comes up, then reduces to about 2" both horiz and vert (HV supply coming down) and the video goes negative (white) If I lower the PICTURE control, everything is normal, I just have to let it back up slowly. I had an '81 zenith console that did this but I junked it because of a weak tube.
Now my question - Is this problem related to aged electrolytic capacitors? If anyone can narrow it down I would appreciate it. Thanks again
kc8adu
09-27-2005, 03:43 AM
the sets that i remember doing that would also have trouble starting up.
they had a 100@35 on the right side as you are behind the set.
it is under a shield and gets baked dry.
now if you have bands of bad focus the tube is shot.