Question about Toshiba 32AF45 32" TV

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Color is not good around outer edges of picture

The color around the outer edges is not consistent with the rest of the picture.

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Re: color is not good around outer edges of picture

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.

Posted on Aug 18, 2007

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The color on my Toshiba 27A41 is not uniform and varies from the left (purple tint) to the right (green tint) with red tint in the center. Otherwise the picture is very good. How do I adjust the color so...

It may be that the degaussing circuit isn't working. This simple device should demagnetize the CRT each time the set is turned on. The circuit consists of a Varistor and the coil surrounding the front edge of the picture tube. The Varistor allows a surge of quickly declining current to flow through the coil to remove any buildup of magnetism that can cause the color problem you currently have. Varistors can fail since they have very low resistance cold and very high once warmed so the momentary power that they dissipate is fairly high and may cause them to fail over time.
You can roughly check the operation of the degausser by using a weak magnet near the TV screen to see the effect it has then turn the set off for 1/2- 1 hour, turn it back on to see if the error you caused with the magnet is removed. Don't use a strong magnet as that influence can take months to remove.

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The picture has a green tint to it on all channels

The color signal consists of Red, Green and Blue. Those three colors, at various degrees, make all the other colors on your screen.

If you have a BRIGHT green screen it's best you don't operate your set.
If it's just tinted green then there is a problem on the CRT (Cathode Ray Tube) drive board. Do check your "tint" setting and see if someone misadjusted it. If that isn't it then you need to have your set on an electronics bench and get an estimate for repair.

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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.

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Screen turns black except for one inch around the outer edge

Use the tv/cap/text button to turn off the text box function of the closed captioning.

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This is a convergence problem and is usually either bad connections at the convergence ICs or defective ICs. If you can solder, you can fix this yourself. Locate the convergence ICs (large black Ics attached to a heat sink and marked STKxxx). Resolder the pins first. If that fails to resolve the problem replace the ICs.

Keep us posted.

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May 03, 2008 | Philips Magnavox 27MS343S 27" TV

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Have you tried disabling SVM (scan velocity modulation)? Often touted as a "feature" of TVs, it's a way of artificially making a picture appear sharp. Totally unnecessary. When SVM (sometimes called VM) is on, it can lead to some color bleeding around edges.

Mar 24, 2008 | Sony FD Trinitron WEGA KV-36HS20 36" TV

1 Answer

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sounds like the degausing coil isnt working or you have a speaker close by.

Dec 04, 2007 | Panasonic CT-36D32 36" TV

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Colored Circles

check the degassing circuit and replace the degassing relay, then use a degausing ring to bring the colors back to normal you should be ok. good possiblity a bad solder connection at the degausing circuit themister.

Mar 17, 2007 | Panasonic CT-27HL14 27" TV

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