Question about Sony KP-48S70 48" Rear Projection Television

2 Answers

Triple picture and purple bubble on big screen

Hi i have aq sony 53" rear projection tv model number kp-53xbr200 and it hase a triple picture in three colors and a purple buble in the top left corner what can i do to fix this problem

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  • marksmonster Sep 17, 2008

    samsung hd 42" hcm 4215w purple line down middle screen. appears to have scracth on green lens, after removing top lens?do i need a lens or crt tube?

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2 Answers

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  • Sony Master
  • 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.
triple picture and purple bubble on big screen - 701cb04.jpg
triple
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 contriple picture and purple bubble on big screen - 2c07611.pngips 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.

578ba6c.jpg TV 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 Feb 28, 2009

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  • Master
  • 1,139 Answers

You may have to degauss your CRTs. Somehow your CRTs have become magnetized and that is what is causing the purple bubble, now as far as the three color pictures, that might be a sign of a convergence problem. for that you may have to put your set into service mode and set the convergence. But first try to degauss the CRTs with a degaussing coil (they have specials on ebay). You will need your owners manual, the remote control, and some patience.

Posted on Sep 26, 2007

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Exactly as the old TV's. There is three tubes producing the picture and the technology is just the same. If you cannot find your instruction booklet, log onto Sony's web site and download it.
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