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Sony tv asked for software update.Since then tv switches on, coloured circles appear which move and then the tv switches off.Tried unplugging the tv, but once plugged back in it does the same thing.

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6 Suggested Answers

6ya6ya
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Could be the printer carriage is binding, oil the rail and try again.

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melnavz
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SOURCE: Plasma TV-power light does not come on

Hello!

most probably the fuse inside the circuit blown out, You should open the back of the tv to become circuit board visible. But this hard when novice do it.

To be sure that everything will be alright i would rather suggest you to bring the tv to the nearest service center. maybe warranty work for that.

best regards,melnavz

Posted on Mar 03, 2008

jerryg50
  • 1667 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.

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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

teeNjay
  • 5 Answers

SOURCE: WS-55909 Mitsubishi Big Screen TV timer keeps blinking

it must be recording soething have u got IQ?

Posted on Dec 30, 2008

  • 4234 Answers

SOURCE: streaks and two black circles appeared on my screen

This is a hard one without seeing the actual defect. It sounds like there is a problem with the processing board. It could be as simple as a poor connection inside at a cable connection. The signal levels inside these sets is very low and any dirt or dust in the connection area can cause "noise" on the digital data lines that can show up in odd ways like you described. If the set is no longer under warranty, you can try reseating all of the cables and connectors inside the set. That may resolve the problem.

If not, try to post a picture of the screen here and I'll try to give you more options.

Dan

Posted on Apr 10, 2009

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Hi! and Welcome to Fixya!

What you have on the tv screen is a warning sign that your tv is currently updating its software. A hand holding a power plug with red circle on it says do not unplug the tv while its running the software update. The usual time for the update to finish is 60 minutes. It may took more than 60 minutes if you have a slow internet speed. This is normal especially if you are running the software update for the first time during the initial setup. The next time tv performs software updates it will take shorter time.

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Screen Colours incorrect


Your CRT (Picture Tube) screen mask has become magnetized. You need to degauss the CRT. Have you moved you TV lately or at any point had speaker sitting next to it? These are two things that can magnetize the screen mask. Well in any event you will need what is called a degaussing coil to demagnetize the CRT.

Here is the degaussing procedure:

Standing about 10 feet from the TV Screen turn on the degaussing coil which is in a vertical position and rotate it in a circular motion walking towards the TV .

Once about .5 to 1 inch from the TV continue to rotate the degaussing coil and the move away from the TV while still rotating the coil.

Once at the point where you began, position  the coil to a horizontal plane and quickly move the coil back about two feet and the turn the coil off.

This will deguass the CRT.

Thank you,
Shuttle83

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