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Re: TV cuts off
I would look at either the on/off button faulty or a heat sink not doing it's job.
Either way, the solution is quite simple. The on/off button simply toggles a low voltage circuit that powers your tv. If it is dusty, it may complete the electrical circuit and send a false signal. A heat sink may be dusty and unable to dissipate heat. Overtemp protection may be switching the TV off.
I would take a can of compressed air, open the back and clean the dust off the circuit boards.
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Every time you turn on a color TV, a degaussing circuit tries to neutralize magnetic fields on the picture tube face that can cause distorted colors. That degaussing circuit isn't strong enough to clear up the field left by direct contact with a magnet. You need an external degaussing ring to clear up the funny colors. You can see what one looks like here. You might be able to find one for sale on eBay or borrow one from someone in the TV service business. Or you can take the TV to a shop where they can degauss it for you for a small charge. Just be aware there's a chance the picture tube may have been damaged if the magnet was very strong and was in contact with the tube for any length of time. A thin metal screen called the shadow mask is behind the tube face, and if that was warped by the magnet then the colors will never line up correctly again. If this has happened, even after degaussing the colors will still be wrong. But you won't know until you try. Good luck, and thanks for using Fixya!
On old style CRT TV's there used to be a Degaus button that nuetralized any static build up inside the tube, and corrected those "Halo" or Color ghosts on the screen. You can take a very strong magnet and pass it a few inches in front of the screen. Try sweeping the magnet across from left to right until you have accurate colors again. (Takes less than 1 minute)
I have a CR202 EM8 and I have had to do this a couple times over the years. On my cable system I can tune in a Color Bars pattern on channel 2, which makes it really obvious where the static build up it affecting your colors.
I gotta love it when people make up answers. There is no such thing as a "contrass module". I'm assuming the poster meant "contrast". The trouble is your 12-year-old picture tube. It's gotten weak and isn't getting as bright or sharp as it used to. Picture tube manufacturers estimate the useful life of a tube at about 7 years today. There are adjustments inside that might help some, but you need a new picture tube. It's going to cost a lot more than $60 to $75 for that. You're better off replacing the TV.
I had a television that went to a bright shade of blue.A friends neighbor worked for sony television plant where the new tubes came down the assembly line.His job was to make sure tubes were working fine,if one color was dominant then his job was to smack the front center of the tube with a rubber mallot to fix the problem.He suggested i try that with my tube while the set was on.It worked and solved my blue problem.Apparently he explained,the gun connections in the tube came loose and to fix it was to smack it this caused the connection to reweld itself.For you I would use the palm of an open hand and smack the tube dead center with a good hard smack.Dont be afraid of breaking the glass because its very thick and strong.Give this a try.Hope it helps.Good luck!
If it does this on all inputs (cable, and dvd player) then yes you have a bad tube. If however you have cable and have a cable box it could be the box causing your problem, same with satellite, if you have satellite it could be the box causing your problem. The cable/satalite thing is just kinda a long shot. You most likely have a bad tube, just trying to give you some hope! let me know!
Assuming this is a TV with a picture tube and not plasma or LCD; I'm
afraid that your picture tube is dying on you one electron gun at a
time. From what you said your green electron gun is almost totally dead
and the two remaining blue & green guns aren't far behind.
Eventually you'll have no picture at all and I would estimate that to
be about 6 more months but whatever the time eventually it will go
totally black. These blackout periods will get longer and longer. The
only way to fix your problem is a new picture tube but my will probably
find it less expensive to just get a brand new TV set.
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.
i think it is a magenatic effect called degaussing problem.
please remove anything very near to it which has got magnet like speaker headphone etc.
call tech to gegauss it. it is hardly 5 minutes job.
please do not change the angle while watching tv.
your tv seems to be 100% ok.
When the colors are off around the edges on a regular picture tube TV, it usually means that the degaussing thermistor's solder joints have cracked loose. Another possible cause is that a strong magnet, such as in a stereo speaker, was brought very close to the picture tube and has magnetized the tube. Resoldering the solder joints on the degaussing thermistor and demagnetizing the picture tube should put the color back to normal.
Sounds like tyo me that the picture tube is getting soft on ya!!. Its a common factor that occours with all tvs but mostly with zenith. A service tech might be able for a small fee rejuvinate the picture tube but theres never a warrantee with this type repair. Its not something a user should attemp to do as theres hi voltage inside this set even on the tube socket after its ubplugged for awhile. Seek the advise of a repair pro to see how bad the tube is. Good Luck