My TV took a tumble while moving it to a new entertainment center. Despite that it fell a good 20", face first, onto a hardwood floor, the tube is still intact. Unfortunately, the picture now has pronounced regions that are saturated by with the various three RGB colors. The picture is otherwise good. Because this occurred directly after the fall, I did not think of trying to degauss it yet, though I'll give that a try this evening.
I'm an EE with access to test equip and have been 'bitten' before so I'm careful while working inside HV sources. Unfortunately, beyond understanding the basic theory of operation, I've got very little idea how the fall may have caused this problem.
Any help or suggestions would be greatly appreciated!
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Re: Rainbow pattern on CRT TV
If degaussing doesn't work, it may just be time to pony up and replace the crt as it sounds as if the shadow mask inside the tube has come loose. And, as you know, there is no opening that to service it.....accordianman
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shadow mask is warped. tv might have been dropped. crt is bad(picture tube). try deguassing it. if you dont know what that is take it to your local service center. the rainbow effect is a magnetic field of some sort. try unplugging and move to a different location. could be a speaker too close to tv.
sounds like a degaussing (magnetizing) problem.could be that the posistor inside the TV set got loose when the tv fell down. If you have experience soldering electronic components, you should be able to fix it by re-soldering. Otherwise, call a tv tech to do it.
My picture would go out after several minutes but I still had sound. I
took the rear cover off and blew all the dust off with compresed air.I
did this for a few times over several days nothing happened.I also took
off the rear circuit board that attaches to the tube with a round pin
socket and blew that with compressed air and put it back on. The TV has
now worked for two days without the picture going out. It
worked!!!!!!!!!!!!!! My TV is 9 years old.
well what i think happend is that the convergance has been modified and some parts has moved inside the TV.
There's lots of posts in this website about this problem so just search for convergance.
also check this link it will exlain you exactly how to deal with it
Let me know if you need more help :)
The only time I have seen that symptom is when the shadow mask of the picture tube gets loose,What that means is you might be looking at a bad crt,color splashes could be a purity problem but rainbow lines are not.Sometimes that happens by itself or by being drop.Good luck