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Re: tube set zenith tv
This is very typical of a Zenith set.Your picture tube will have to be replaced.One of your 3 primary colors (red,green,&blue) have turned off leaving you with the color of the dominant color.I would heave it.
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The picture tubes in Zenith sets (I assume it's a Zenith since you posted this with a Zenith heading, although it's also true for any set this old) were only expected to last around 7 years. Your description makes it sound like you are missing green, or that the green is just way low. This is a common sign of a bad picture tube. There are other possible causes, but tube failure is the most likely. The low replacement cost for small TV sets makes repairing this one uneconomical.
Get rid of the set and treat yourself to a new one.
Absolutely not worth repair. You have described a classic symptom of Zenith picture tube failure, and about 99% of the time the main board in the TV is ruined as well. You've gotten good life from the set (manufacturers figure tube life is around 7 years these days), so it's time to replace it.
Sorry to say, you need a new TV. The picture tube is bad, and allowing high voltage to feed back into the set where it shouldn't go. It would cost more to replace the picture tube (and probably the circuit board as well, as that usually gets damaged too) than a new TV.
Chances are, if it's an older set, componants have changed value through use over time, which also includes the picture tubes and associated driver circuits. The way to compensate for this color drift is through adjustments. Either turn the red down a little, or turn the blue and/or green UP. Be carefull though as there are potentially dangerous voltages in and around the circuit boards and picture tubes.
zenith have many problems with crt (picture tube) they comes be short or one or more canon fail, there are nothing to do, replace the picture tube, and thats a lot of money for an old tv...good luck
ps adjusting the screen and resoldering the picture tube card could help but remember there are many dangerous circuit in a tv...
Sorry to be the bearer of bad news bud, but thats the beginning of the end for your picture tube. The tube is what the industry calls a soft picture tube. On a set like this it wouldnt be feasable to replace unless you get a good deal and or you realy like the set.