Question about Mitsubishi WS-65809 65" Rear Projection Television

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Convergence issues I have the below model HD compatible TV. I have had for about 5 years with no problems. In the last couple of weeks I have noticed, (especially when watching HD on DirecTV), that the picture appears to fade in and out of focus every 5 to 10 seconds. I went in to adjust the convergence and that is when I noticed it in a big way. If I am adjusting for example the Red convergence, the white grid initially appears fine and in sync. After a few seconds the red will appear below the white grid lines, then after about 5 seconds it merges back into the white grid lines i.e. back into convergence. Same with the Blue adjustment. It only happens on the sides of the picture, about the first 4 grid lines from each side in. Any suggestions are appreciated, and thanx in advance, Brad

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Drifty convergence IC's need replacing..located on center PC board......STK392-570...change them both for reliability...T.

Posted on Feb 28, 2008

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Convergence Problem


Your TV most likely has one of two possible problems.

Problem #1: Convergence Chip Failure ( common problem )

Here are some of the most common symptoms and example photos of a convergence problem
  • 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.
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Here is a quick test....

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

Try to adjust the red and then the blue convergence.



You should be able to move them up, down, left, and right.

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

2c07611.pngSolution #1

You need to replace the convergence chips and convergence resistors. Check the site www.TvRepairKits.com. They have put together a kits for most models. If you don't see a kit for your set send them a quick note and they will put one together for you. Their kits include a photo instruction guide, original OEM Sanyo STK chips, convergence resistors, pico fuses, etc.


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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2c07611.pngSolution #2


What you will need to do is replace the coolant and clean the crt. You can get a repair kit from www.TvRepairKits.com that includes replacement coolant, photos. instructions, etc.

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One more thing, there may be some small Pico fuses or other fuses near the convergence power supply - check all fuses as well.

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http://home.earthlink.net/~oleg.filippov/ConvergenceFix.htm
http://cmpalmer.blogspot.com/2006/11/fixing-my-own-tv-part-ii.html

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