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JVC AV-28T67ske picture problem (colored circles)

 
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ccmica



Joined: 21 Sep 2008
Posts: 2

PostPosted: Sun Sep 21, 2008 7:39 am    Post subject: JVC AV-28T67ske picture problem (colored circles) Reply with quote

My JVC AV-28T67SKE when switched on the other day had large bright concentric colored circles all over the screen with their center in the middle of the screen.

When I unplugged the TV from the mains and waited for some time, the symptom disappeared.

Any clue was is happening?

Thanks.
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dallano



Joined: 30 Oct 2008
Posts: 4

PostPosted: Thu Oct 30, 2008 8:11 am    Post subject: Color problem Reply with quote

What happened is that your picture tube was magnetized. sometimes vacuming near the reciever or placing speakers on top of the reciever or near it will cause the Picture tube to magnetize. TVs have a built in "degaussing coil" when the TV is turned on, it will show a rainbow of colors. When you turned off the TV then turned it back on the degaussing coil demagnetized the picture tube. It will probably not happen again if you are careful not to place anything magnetic or vacume near the reciever.
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ccmica



Joined: 21 Sep 2008
Posts: 2

PostPosted: Thu Oct 30, 2008 6:00 pm    Post subject: Color Problem Reply with quote

Dallano

That explains everything. I usually leave the tv set on standby. Consequently by soft staring it no degaussing function is performed. It seems degausiing happens only on hard power on.

Thanks for your advice.
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dallano



Joined: 30 Oct 2008
Posts: 4

PostPosted: Thu Oct 30, 2008 9:39 pm    Post subject: Reply with quote

yes, i forgot to tell you that degaussing does not happen with using your remote. Thre is also a degaussing coil you can buy to demagnetize the reciever. You can buy it at radio shack or other store. But this days you don't need it. back in the day when color TV's were first manufactured, they were not solid state but used vaccume Tubes instead of transistors. TV repairmen would have to replace the tube and then demagnetize it.
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minnie



Joined: 18 Aug 2005
Posts: 2877
Location: Hell

PostPosted: Thu Oct 30, 2008 10:41 pm    Post subject: Reply with quote

Turning it on and off and letting it sit should do the trick.
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