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Sony TV: KV20FS120. Discoloration band up left side of screen. Won't clear with degaussing or adjustment of tavbs. What next? jt

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  • jonathan thayer Mar 17, 2011

    This window won't accommodate my photo. Can I send it to you at some other mailbox? jt

  • jonathan thayer Mar 18, 2011

    WG, Thanks. Moving the yoke and adjustinjg the tabs only makes it worse. Loose shadow mask inside tube? Best of luck as always, jt :)

  • jonathan thayer Mar 18, 2011

    excellent assistance


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It would be helpful if you post image of tv screen here to understand the problem properly, apparently it is purity problem that is related to aperture grille of picture tube and reason could be improper setting of Deflection Yoke mounted on picture tube neck or tv got hit hard with any object and aperture grille inside tube got misaligned (this is irreparable problem and picture tube replacement is only option).
I'm looking for tv screen image to see color problem.

Posted on Mar 16, 2011

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  • Shahid Electronics
    Shahid Electronics Mar 17, 2011

    Yes, please send picture to

  • Shahid Electronics
    Shahid Electronics Mar 18, 2011

    Thanks for tv picture, it shows purity problem and Yoke adjustment will minimize purity error. Loose screw on yoke ring and slide yoke little forward/ backward to eliminate green bars in blue screen and tight yoke screw.

  • Shahid Electronics
    Shahid Electronics Mar 18, 2011

    If yoke adjustment makes purity worst than I'm afraid, it is problem of disturbed shadow mask/ aperture grille in tube and usually it happened when tv/ tube got hit with some thing or dropped during transportation.
    Picture tube needs to be replaced to solve tv problem.


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Sony TV set, KV20FS120 BA6 chassis: light blinks, set isn't coming on. Why?

Sony sets like this have a built-in self-diagnostic function.
The blinks of the Standby LED are the self-diagnostic codes.
There may be more than one error. The blinks indicate only the first error.

Unlug the set. Wait 30 seconds.
Prepare to count the number of times the Standby LED blinks.
Plug the set back in. Count the blinks.

2 blinks
  • Diagnostic Item Description: +B overcurrent (OCP)
  • Probable cause:
    • H.OUT (Q506) is shorted. (A Board) (20"/21" models only)
    • RGB Amp (IC1751) is shorted. (CV Board)
  • Detected Symptoms:
    • Power does not come on.
    • Load on power line is shorted.
4 blinks
  • Diagnostic Item Description: I-Prot
  • Probable cause:
    • +13V is not supplied. (A Board)
    • IC545 is faulty. (A Board)
  • Detected Symptoms:
    • Has entered standby state after horizontal raster.
    • Vertical deflection pulse is stopped.
    • Power line is shorted or power supply is stopped
5 Blinks
  • Diagnostic Item Description: IK (AKB)
  • Probable cause:
    • Video OUT (IC545) is faulty. (A Board)
    • IC001 is faulty. (A Board)
    • Screen (G2) is improperly adjusted.
  • Detected Symptoms:
    • No raster is generated.
    • CRT Cathode current detection reference pulse output is small.

The above may be of little help. Your best bet is to download the service manual for the KV20FS120.

...Google search: Sony KV20FS120 service manual

Apr 26, 2016 | Sony Televison & Video

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Panasonic TC-P42S2 .. Transparent 2 inch wide vertical discoloration on panasonic 42 inch plasma, very left of the screen.

Fixed mine, myself! Black 3 inch vertical band (stripe) appeared after a cros country move on our PC-T50G10. Occasionally we would see white band with multicolored pixel width stripes. Took the risk of taking off the back to see if I could see anything. Found places on sides and bottoms where plastic like 2" flat cables could be seen. Guesstimated where the band was and found that I could flip down a black cover on one end of the cable. Tried to pull it, gently. Mistake. Realized it wouldn't one out like computer hard drive cables, so I took out the screws holding the plate on the other end (it's only an inch long). That allowed me remove the cable. Took it out, cleared away dust, put t back and closed the black over. It worked! Put the screws back in, back on and... we are happy (although I do have four extra screws!). Just be gentle.

Feb 17, 2012 | Panasonic TH-42PD50U 42 in. Plasma EDTV

1 Answer

Magnet came in contact blue green and red color

Every time you turn on a color TV, a degaussing circuit tries to neutralize magnetic fields on the picture tube face that can cause distorted colors. That degaussing circuit isn't strong enough to clear up the field left by direct contact with a magnet. You need an external degaussing ring to clear up the funny colors. You can see what one looks like here. You might be able to find one for sale on eBay or borrow one from someone in the TV service business. Or you can take the TV to a shop where they can degauss it for you for a small charge. Just be aware there's a chance the picture tube may have been damaged if the magnet was very strong and was in contact with the tube for any length of time. A thin metal screen called the shadow mask is behind the tube face, and if that was warped by the magnet then the colors will never line up correctly again. If this has happened, even after degaussing the colors will still be wrong. But you won't know until you try. Good luck, and thanks for using Fixya!

Jun 02, 2011 | Daewoo DTQ-27S5FC 27" TV

1 Answer

I have a RCA Model # F20051EM or F26051EM, The number is worn off and hard to read. I pulled it out to clean off the dust tipped it on its side and after putting it back in the entertainment center the...

Your screen needs to be degaussed. It's normal for the colors to look a little strange after you move a set around because of magnetic fields, and degaussing tneutralizes the field on the tube face which causes the discoloration. There is a circuit in color TV sets to degauss them automatically when you first turn them on, but they can't always cope. Or a part called a thermistor may have failed in your set (it's common) and the degaussing circuit may not be working.

The colors may gradually come back to normal if the TV degaussing circuit is working. You can purchase a handheld degaussing coil and clear this up, or you can call a TV technician to come out and do it. I have no idea what it costs for service calls today - I've been out of that business a good while now. I just made a quick check on eBay, and several degaussing coils are listed with average price around $50. Check what a tech would charge to come out and let price be your guide.

And the x-ray shutdown test you mentioned has nothing to do with the colors. That's to make sure the set will shut off properly if the picture tube voltage rises too high, possibly causing a safety hazard from x-ray emission. Don't worry about that; only after replacing some parts in the high-voltage section do you need to check the operation.

Thanks for using Fixya!

Oct 06, 2010 | RCA Televison & Video

1 Answer

I am starting to get a discoloration in the bottom left side of my screen. It is slowly making it's way up to the middle of the screen.

If it is a tube type TV, probably needs degaussing. The screen within the crt becomes magnetized or external magnets from speakers are causing a problem. Sometimes changing the direction or position the tv faces causes degauss problems. If moving nearby speakers changes the discoloration, then speakers are too close or TV needs degaussing. Some high-end Asian tvs have E-W adjustment in users menu to correct this problem.

If it is RPTV 3 tube crt TV, maybe a convergence problem.

If it is DLP or LCD rear projection, probably optical engine failure.

What model is TV. Is picture normal in BW with color turned off?


Apr 22, 2010 | Televison & Video

1 Answer

Pink and green on left side of tv someone told me there were something called "guns" that need to be adjusted.

no! the "guns" are fine. if the tv is a direct view, with glass screen, just needs degaussing. if a projection tv(plastic screen), the tv needs convergence adjustment

Nov 17, 2009 | Televison & Video

2 Answers

Sony screen discoloration

Assuming this is a CRT monitor.

Try using the Degauss setting on the monitor buttons. You may have to do it a couple of times.

This could be also due to a fluorescent lamp or other monitor too close.


Nov 16, 2008 | Computers & Internet

1 Answer

Picture problems

First thing I would try is a degaussing coil. The problem was not caused by the speakers in the TV (they are magnetically shielded) but by some kind of external magnetic field, like speakers or refrigerator magnets. Could also explain the picture shift, if it's severe enough and someone used a strong magnet.
You can find degaussing coils here:

They usually come with some basic instructions. You can also make your own and instructions for using one can be found at the same place:

If your question has been answered by this be sure to rate me. Thanks!

Oct 25, 2008 | Sony FD Trinitron WEGA XBRKV-40XBR800 40"...

1 Answer


Get your remote and go into the menu and see if you can find the "horizontal static convergence" adjustment, or it might just say "convergence". You have a small chance that this will solve your problem. Also make sure that nothing with magnets is located near your set. They will distort the color if too close to the set. Also, if you have a friend who is in electronice, see if he/she will loan you a degaussing coil and show you how to use it. You do not have to take the tv apart to use the degaussing coil and it takes only a few seconds to degaus. Go to and learn in laymens terms about this tool.

Feb 22, 2008 | Mitsubishi WS-55807 TV

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