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Magnavox PTV910 projection TV has blurred blue gun. The coolant in looks ok as far as I can tell from looking with a flashlight or with the TV on. There is also a buzz in the audio which I suspect to be a bad cap. Is there a frequent failure in these TVs that would cause the blue gun to blur that I can check?

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  • John Jimison May 09, 2009

    Yes, I looked more closely and found the lens fogged. After cleaning it and installing new coolant the TV is working.

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I don't know about the buzz but when you need to replace the coolant it isn't the coolant that actually gets blurry, it is algae that grows over the crt. It kinda looks like snow if you look in there, maybe a tannish color on the blue tube. Usually only grows on green and blue tubes as plants don't grow under red light. Lots of directions available to replace the coolant but my recommendation would be to tip the tv over backwards, pull the plastic focusing assembly clean off catching the old coolant in a cake pan. Be sure not to let any leak on boards as it is conductive. Once those are off you will be able to wipe the CRTs off with a soft cloth. Pretty easy to fill them back up with a small funnel.

If you don't see any algae in there, there are six color coded dials that adjust focus electrically and brightness.

Dave

Posted on Apr 28, 2009

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HOW DO I ADJUST COLOR BACK TO ORIGINAL CONFIGURATON?

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1 Answer

Magnavox ptv910


The coolant in the green and blue tubes has discolored causing the red to dominate the screen,. This is a common problem that you can fix yourself with a CRT or Dull video repair kit from www.TvRepairKits.com

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I have a Hitachi 43FWX20B. I can see the red is not lined up with the blue and green on the far left side of the screen. Only the red and only on the far left side of the screen. Blue and Green are OK. I...


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Projection TV sets have two very common problems. One is convergence ( 3D/Warped video) the other is CRT fluid ( Dull Video). Below are more details for both items. Also, complete repair kits with instructions and repair support are avail from site such as www.TvRepairKits.com

Common Problem #1) Convergence has gone out

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.

This is a very common failure on these projection sets and a fairly simple DIY fix. All projection sets including Samsung, RCA, Sony, Philip Magnavox, Panasonic, Pioneer, Akai, GE, JVC, Toshiba, and others at some point will have the same problem.

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. Power light will blink. TV may also make a chirping noise.
Here are some pics of convergence problems.


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69189a5.pngSOLUTION #1

For more more examples and find a fix using this link on Fixya http://www.fixya.com/support/r2861467-solution_video_looking_whiteish_dull

Common Problem #2) CRT Fluid is Cloudy

Projection TV tubes have a liquid coolant that is used to keep them from overheating. After many years the coolant in the blue and green tubes will become cloudy and cause the screen to look dull, red/orange, etc. You may even see halos around images.

Picture of a set that needs the fluid changed.

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TV set after fluid change

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69189a5.pngSOLUTION

You can see some more examples and find a fix using this link on Fixya http://www.fixya.com/support/r2861467-solution_video_looking_whiteish_dull

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hi,
try to change the crt base socket of blue gun and then try. i will suggest if you replace the base socket change all the three at the same time.
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crt base

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U have a CRT Tube coolant problems.Tries Websites MCMElectronics.com,Tv reapair World.com to buy CRT tube coolant to recharge ur CRT.

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http://www.tvrepairworld.com/

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change the coolant in the green and blue CRTs. Then also poloish the mirror by cahnging the coolant your set will be as bright as when it was new. If you need more info, please let me know.

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