Question about Sony KP-43T70 43" Rear Projection Television

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Sony KP_43T70 Ive had this tv for about 7 yrs now and last night I noticed the colors started to change.The picture itself seems ok but you can see the three colors in horizontal bars rolling down the screen from top to bottom continuously like an old b&w tv used to do. So face change from red to blue to green.Whats up with it? and is it an expensive repair?

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Re: Sony KP_43T70

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.
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 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.

TV set after fluid change


2c07611.pngSolution #2

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

Posted on Feb 28, 2009

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Re: Sony KP_43T70

Double picture on all channels.
Found IC1502 on the G Board defective.

Service manual can be requested at

Posted on Jun 01, 2008

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