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Poor picture quality - Projection Televisions

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  • brandfarm Jan 28, 2009

    I have a jvc hd-52z585 52 in rear projection hdtv television. It has a very grainy picture and is not crisp at all. Do I need to change the lamp? I bought this used and it had flashed on the screen once that I should change the lamp.

  • Landon V.W May 11, 2010

    What is you tv model and i might be able to help.

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  • 3,459 Answers

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.
poor picture quality - 701cb04.jpg
77ea520.jpg
f0900cb.jpg
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.
Solution #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 poor picture quality - 578ba6c.jpghanged.

578ba6c.jpgTV set after fluid change

65af323.jpg

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.

Posted on Mar 22, 2009

50p8341a

Posted on Oct 20, 2008

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  • Contributor
  • 51 Answers

Make sure all of the cables are plugged in tightly and that it is a good tv. and then if that no work call your dealer and ask for assitance. i hope this helps, post more detail for more help from me.

Posted on Oct 02, 2008

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