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Concentric circles of colors red, green, blue on TV screen

I am getting concentric circles of colors red, blue and green on my tv screen. My model is Sansui 29 inch PJ29 Multiplex.

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6ya6ya
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Posted on Jan 02, 2017

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jomaru
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SOURCE: RCA 25: television

Sounds to me like a bad picture tube with circle rainbow like colors.Good luck.

Posted on Sep 12, 2006

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  • 275 Answers

SOURCE: Concentric rings with different color distortions - time for a new set?

Time to get a new TV

Posted on Apr 09, 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.

--

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

ltfrc
  • 227 Answers

SOURCE: What is the code for Sansui TV model PJ29 Multiplex WT

Try 189

Mike

Posted on Jul 10, 2009

SD Tech
  • 14553 Answers

SOURCE: how do I fix concentric color circles on Jvc av 2779s?

AV2779S--the 27 means it is a 27 inch and a older one at that.

All the older regular sets have a Degausser in them--a coil as thick as your index finger--each time the set is turned on it demagnetizes the face of the tube--happens so fast you never see it.

This circuit consists only of a few parts--most common failure is the posistor (a small black rectangle near the main fuse) breaks loose from the board.

It only has 3 connections on the bottom and does get rather hot--my money is if someone locates it and looks on the bottom of the board one or more of the 3 connections is broken loose.

What will happen is with a bad connection there when set is turned on the Degaussor does not completely finish its job before it cuts off.

If I am right--someone with even moderate skills, a soldering iron and solder gets the board out and 5 minutes later after resoldering all 3 connections----wait 60 minutes plus for Posistor to get totally cool will have a normal picture again.

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Posted on Apr 06, 2012

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My flat screen Sylvania TV is flashing different colors what's wrong


Better late than never. The problem is that your TV is in the service mode. There are many ways this can happen. But, lets just get down to fixin this! With the original remote and the TV on. If the TV will not shut off, do this. Press the left cursor button on the remote, followed with pressing the right cursor. Power off the TV with remote, or press off button on TV.

Secondly, your TV will power on and off. But you have flashing colors. Do this. With the original remote and TV on. Press the up cursor button, on the remote, followed with pressing the down cursor. Power off TV with remote, or press off power of TV. Thanks for asking me, Matt of Martins TV Repair.

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1 Answer

How do I fix concentric color circles on Jvc av 2779s?


AV2779S--the 27 means it is a 27 inch and a older one at that.

All the older regular sets have a Degausser in them--a coil as thick as your index finger--each time the set is turned on it demagnetizes the face of the tube--happens so fast you never see it.

This circuit consists only of a few parts--most common failure is the posistor (a small black rectangle near the main fuse) breaks loose from the board.

It only has 3 connections on the bottom and does get rather hot--my money is if someone locates it and looks on the bottom of the board one or more of the 3 connections is broken loose.

What will happen is with a bad connection there when set is turned on the Degaussor does not completely finish its job before it cuts off.

If I am right--someone with even moderate skills, a soldering iron and solder gets the board out and 5 minutes later after resoldering all 3 connections----wait 60 minutes plus for Posistor to get totally cool will have a normal picture again.

Comments or Question?

Apr 06, 2012 | Televison & Video

1 Answer

Advent tv displays green


If you are saying no red: The model indicated here Recoton Advent Advent Q1435A TV is a 14 inch set.

first it may be cheaper to replace than repair--That said if no red look to the small circuit board at end of picture tube (it plugs onto the tube).

It will have either individual output transistors or a single IC.

What (if only one color missing) I would look at is the bottom side which faces to the rear---a circle of solder connections--possible one is broken--there will be one for each red, green, and blue--not always easy to see but if any of the solder connections look cracked or even broken loose-----

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1 Answer

TV FADES TO BLUE AND THEN PICTURE DISSAPPEARS- AND SOMETIMES TV SHUTS OFF AFTER GOING BLACK WITH CONCENTRIC GREEN LINES


Turn your screen drive down to green and blue tube.
You have a focus/screen drive control block that you can adjust each tube R/G/B

Mar 17, 2010 | Sony KP-65WV600 65" Rear Projection...

1 Answer

Hitachi 43FDX15B distorted picture. The top of screen displays a half circle cirle and the image is distorted within the half circle. The same at the bottom of the screen. The middle of the screen is fine....


Projection TV sets need to have all three colors - RED - BLUE - GREEN - lined up correctly on the screen in order for the video to look normal. When its out of alignment the video will look 3D, wavy, distorted, etc. Most of the time you just need to adjust your convergence in the TV menu. If you cannot adjust it in the menu - then your convergence is broken and needs to be repaired.

Convergence problems are very common on all Projection TV sets including Sony, Samsung, JVC, Philip Magnavox, Panasonic, Akai, Pioneer, Hitachi, Zenith, and others. You can get a convergenece repair kit from the link below.

Common Symptoms include....
  • Screen looks 3D
  • Colors don't line up
  • One or more colors can't be adjusted when using the convergence menu.
  • Screen is bowed or warped.
  • TV shuts off after powering on - TV may also make a chirping noise.
Here are some photos of convergence problems.

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Here is a quick test....

Using your original remote go-to the settings menu then goto the convergence section.

Try to adjust the red and then the blue convergence.

You should be able to move RED and BLUE in all directions - up, down, left, and right.

If you can't move them in all directions or cant move them far enough your convergence chips are bad and should be replaced. This is a common problem.

Note: If you TV has as flash focus or magic focus button only try pressing the button. If it fails to fix the convergence your need to fix it. See below for a solution

93a1209.pngCONVERGENCE SOLUTION

You will need to replace the convergence chips and possibly some convergence resistors and pico fuses.
This is a a fairly easy DIY job if you know what you are doing. If you have never done this before we would advise calling a shop or if you want to do it yourself get a complete kit with instructions and support from www.TvRepairKits.com

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Picture forming concentric rings of colours - green, surrounded by blue, then red halo. What is the cause and what do I need to do about it? Thanks


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1 Answer

Colored Circles


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

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1 Answer

RCA 25: television


Sounds to me like a bad picture tube with circle rainbow like colors.Good luck.

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