Question about Toshiba 32AF41 32" TV

Open Question

My Sinotec 74cm TV was fine until the power mains went off. When the power came back there are concentric circles of primary colour instead of the plain blue standby screen. There is a satellite TV decoder plugged in that still works, but the colour is all wrong.

Posted by duinebosch on


3 Related Answers


Randy Hough

  • 2559 Answers


Press and hold down the Music button for about 10 seconds

please rate this solution

Posted on Jan 18, 2009


Jerry Greenberg

  • 1691 Answers

SOURCE: KV-28CL10U colour circles

There are two things that commonly cause the fault that you are describing. Below is the main one.

It is very possible that the degaussing circuit or the degaussing coil is no longer working. A common fault is that the degaussing thermosistor has gone defective and the CRT has become magnetized. The earth's magnetic field along with other environmental things cause the CRT's internal mask to become magnetized over time.

The thermosistor in most Sony TV sets is located in the power supply area. It looks like a little black square box with 3 solder posts on it. In some models it has 2 solder posts. After a number of years this part may fail.

When the power is first turned on, the thermosistor is very conductive. After it heats up, it goes very high in resistance. It drives a high decaying AC mains current through the degausing coil (located around the shroud of the CRT assy) for about 50 to 60 ms. It then allows the current to decay to zero over the next 50 ms. When you turn on the TV set, you normaly hear a kind of a loud thump noise. This is the degaussing action.

Once the degausser is serviced and is working properly, it may take a number of power cycles to eventualy demagnetize the CRT. After shutting off the TV, it takes about 20 minutes before the degausser can work again. The thremosistor needs some time to cool down.

If you are not experience and trained for doing TV service, I would suggest you give the set out to an experienced TV service tech to change this part. There are serious safety issues when working inside of TV sets.

It is possible to purchase a manual hand held degaussing coil. There is a proper procedure for using this type of coil. If you were to manualy degausse your CRT, you would have to do it on an almost daily basis. The manual degaussing coil is fairly expensive to purchase. It would be better to service the set.


The second thing that causes the CRT to show colour purity problems (color splotches, or circles, or patches), is that the mask inside on the face of the tube has become dislodged off its supports or became warped. This can happen if the set has been dropped, or hit hard enough to do some damage to the mask. I have seen this where TV sets were roughly handled during moving them.

The only fix for a damaged CRT mask is to replace the CRT. The cost would be as much or more than the set is worth. This is if you can even find a replacement CRT. Most all of the manufactures no longer manufacture replacement CRT's for consumer products.

Only specialized CRT's are still being produced on a limited bases for specific industrial and military equipment that must still be kept in service. These are for some types of radar, medical, aerospace, and other related industries.

Jerry G.

Posted on Apr 16, 2008



  • 71 Answers

SOURCE: TV went blue

either shorted picture tube or blue video output circuit

Posted on Apr 27, 2008

Add Your Answer


Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Our Sinotec T.V. Went into a deep sleep. What do we do?

Main power supply regulator board (SMPS board) inside the TV is faulty. Check and replace it. If you wish to get more details visit the site linked here.

Jan 11, 2017 | Televison & Video

1 Answer

Have a 74cm Logik TV ,TV does not switch on,checked the power supply , all seems fine?

If the set do not switch ON; the main power supply regulator board is not working. You can't detect its fault visually. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience.

Dec 16, 2014 | Televison & Video

1 Answer

We are on holiday and the tv - Sinotec with remote RC-N38 has a blue screen with red LCD TV going over the screen. It was working fine last night however - anyone that can help with this ?

turn it off at the mains
hold in its power on button
turn on the mains

perhaps it just needs reset

other than this perhaps the cable box has an issue with its video

so do the same with that box
turn off its mains hold in its power button
and turn on the mains wait 20 seconds let go
then it will re init takes some time

Dec 02, 2014 | Televison & Video

1 Answer

Sinotec LCD TV doesn't store channels anymore? It

The main system control memory IC to your TV is faulty. It should be replaced. It is a very small IC, having only 8 solder terminals, and can be located very near to the main system control IC. It will look some what like this, and will begin with a numner 24c**

May 26, 2013 | Televison & Video

1 Answer

Colour on my alba tv looks wierd

Digital processor section and T'Con board should be suspected.

May 02, 2012 | Alba LDVD1538WDCH LCD TV

1 Answer


I just followed the instructions to program the Samsung remote (Press tv button then press and hold the power button whilst pointing at your TV and type in the code) ....I went through every code until my TV turned off....The code for my Sinotec is 75

Jun 14, 2009 | Samsung TXM3296HF 32" TV

2 Answers

Hisense color TV ±74cm, Model TC2919H



Sep 04, 2008 | Televison & Video

1 Answer

Colour diffusion

Sounds like the picture tube has got itself magnetised. Can be caused by a external magnetic field, maybe the set is too close to a central heating radiator, or you've got too near the set with a vacuum cleaner. Usual cause is a dry jointed degauss element in the TV, should be visible after you've removed the circuit board and had a close look underneath. Just scrape the pins, sometimes two, sometimes three and resolder them to the board. DO NOT ATTEMPT THIS YOURSELF IF YOU ARE NOT FAMILIAR WITH TELEVISIONS AND THE ELECTRIC CHARGE THEY HOLD FOR AGES EVEN IF THEY ARE ISOLATED FROM THE MAINS!!

Jun 04, 2007 | Beko 324250WN 28" TV

Not finding what you are looking for?
Toshiba 32AF41 32" TV Logo

Related Topics:

104 people viewed this question

Ask a Question

Usually answered in minutes!

Top Toshiba Televison & Video Experts

The Knight
The Knight

Level 3 Expert

76466 Answers

Muntejaya Ginting
Muntejaya Ginting

Level 3 Expert

10422 Answers

matt martin
matt martin

Level 3 Expert

1258 Answers

Are you a Toshiba Televison and Video Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides