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Tube tv has a discolored spot on outer edge?

I just recieved a tube tv and it has a discolored spot on the outer egdge of screen about 4''x2''. Do you know what might be wrong with it/ how to fix it?

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Sounds like it may be a deguasing issue. What type of set?

Posted on May 16, 2009

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I need a place to change my dirtbike tire and tube


get 4 bricks and place wheel on top , release air , stand on the tyre to push it off the seal , both sides , then carefully lever tyre over outer edge , make sure to push one edge of tyre in and DONT CATCH THE INNER TUBE ! take inner tube out and do the same the other side ! get new tyre and replace in reverse order !

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Growing Black Spots on Insignia LCD Flat Screen


Hi,

Black dots/spots on an LCD panel display indicates either a dead pixel or a stuck pixel. Alternately, if you press lightly on the black spots and they go bigger/darker, then in some instances, it could be that the frame holding the display has been slightly warped when too strong a pressure was applied when it was being cleaned. Should this be the case then corrective measure would be to disassemble and flatten whatever area was dented. Some have reported success with the use of a suction cup. Perhaps this, this or this might be interest you.

If the unit is still under warranty, please try discussing your concern with your dealer. Though a few small spots are an acceptable norm. Alternately and if the warranty has lapsed, there are companies online that offer LCD replacement kits or will replace/fix your LCD and it would cost you less than the cost of a new screen or TV.

Other than the above, am afraid that your options are rather limited.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

Apr 10, 2008 | Insignia IS 20" TV040919 TV

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?

easyab

Apr 22, 2010 | Televison & Video

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TV has color bloches at corners


Assuming this is a tube style TV (not lcd flatscreen) your degausing coil in your TV sounds like it is defective . The Degaussing coil on newer televisions / monitors surrounds the outside edge of the TV and turns on when the TV is fired up. In the old days, their used to be no degaussing coil - when a child would take a magnet to a CRT television, magnetism would remain on the tube and cause discoloration and blotches as you describe (multi-colored blotches) To correct this a technician used to use a degausassing coil and perform a circular pattern on the screen to remove the improper magnetized area. Since the old days, newer tvs have degauss coils built into them, but if they go bad, or always on etc... they can cause the problem you describe.

Apr 11, 2009 | Sony FD Trinitron WEGA KV-36FS120 36" TV

1 Answer

Fix a color problem


What you want to do is degauss the tube.
I do not believe a supplier will sell a CRT to anyone thats not a TV Tech. Safety/liability issues. The CRT is vacuum sealed and will implode if broken and the tv has 25000 volts even after unplugged for several days !!!
A CRT may cost as much as a new tv.

Several methods some people have found useful are;

Soldering Gun Method (NOT soldering iron)

1. Hold the soldering gun to that the rear of the case is toward the screen (the tip is facing away from the screen at a 90 degree angle) A magnetic field is generated by the transformer in the handle.
2. Place the gun in the center of the screen and turn it on, keeping it near but not touching the screen (to prevent scratching)
3. Slowly move it to the top edge (or any edge), then slowly around the outer part of the screen (but still in front of the glass) until you return to the top (or the edge you moved out to), again slowly return the gun to the center of the screen.
4. Keeping the gun on, slowly pull it straight away from the crt until there is no more distortion visible (usually 3-4 feet), then turn the gun off.

Rigged Drill Method ( parts can fly off so take care)

1. Get a magnet and tape it to the end of a high RPM drill and make sure it is held in place very tightly, use Duct or packing tape
2. Hold the rigged drill next to the spot to be fixed, make sure it is about 1-2 inches away from the screen
3. Now pull the trigger an you'll see the screen blur fast, this is normal so do not worry
4. Whilst the drill is running, slowly pull away from the screen and you may see it is fixed
5. This process may need to be repeated due to magnet strength and drill speed but it will work
6. Due to physics the fast, random turning of the magnet/s will fix the screen's colors

Mar 27, 2009 | RCA Televison & Video

2 Answers

Small spot on screen


you have dust on your projector, you should be able to take the screws out around the screen, lean the screen away from the tv, and wipe dust off the projector

Jan 07, 2009 | Panasonic PT-50LC13 50" Rear Projection...

3 Answers

Strange screen colours


Your degaussing circuit is not fully 'demagnetizing' the picture tube.
You can manually degauss it using a strong magnet, but it's tricky.
With a tool made for demagnetizing you simply hold it close to the center of the picture tube and using a circular motion slowly spiral outward to the outer edge of the tube, pulling the magent further away from the tube at the same time. The same can be done using a strong magnet although the results may not be perfect. You can experiment with a magnet using wiping motions as you bring the magnet closer to and further away from the tube.

Mar 05, 2008 | Beko 324250WN 28" TV

1 Answer

Interference?


The picture tube on a TV can be magnitized by the Earth's magnetic field. The noise heard when you turn a TV on (usually followed by a static noise on the face on the TV) is called degauss. What this does it remove any magnetic variations on the tube due to things like the magnetic field and speakers. However, changes to the TV in orientation to the Earths magnetic field will cause the tube to have a magnetic bias. This is most prominent when turned 90 degrees. The easy way to clear this is to turn the TV off for a little while and then turn it back on. But remember that any movement once it is on can cause the discolorations to reappear. My suggestion would be to turn the tv after you've moved it to the location you'd like to view it.

Nov 15, 2007 | JVC AV-36D502 36" TV

1 Answer

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.

Aug 17, 2007 | Toshiba 32AF45 32" TV

3 Answers

Tv knocked over


change the picture tube the screen has moved..sorry...good luck..

Jul 24, 2006 | RCA F36685 36" TV

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