Question about Sony KP-46WT500 46" Rear Projection HDTV-Ready Television

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Convergence misconvergence red horiz. left edge- 2 inches. stks replaced, resistors and fuses ok. I have repaired at least one hundred sony tv's of this type with no problem. can red horiz conv. be reset and reconv. ?

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If you have repaired these TVs before, you know exactly how to do it. The only possibility would be that one of the STKs IC could be defective even if it's new.
I would also suggest to check any other components around the STKs area and also check for dry solder joints, specially around the high power resistors.
You will need to have the service manual to get into service mode to adjust the convergence values.
Let me know if you need further assistance.

Posted on Sep 03, 2008

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After replacing the stks you need to perform convergence adjusment procedure.
If Stk keeps burning out then replace convergence board.

Posted on Sep 03, 2008

  • Ginko
    Ginko Sep 03, 2008

    First do convergence setup, follow the procedure on servicce manual.
    If you still get troubles, test for continuity the small resistors near to the STKs on convergence board. If they keep blowing there is a powering problem on STK, better replace the convergence board (you can buy it without STKs) before blowing the convergence ICs again.


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Marilee, you will need to check on the service manual schematic of what types of voltages you have on the IC's now. Most of the time, there are whats called pico fuses that blow out when the convergence IC's blow out. They are located on the G board, and are yellow in color. They look like small resistors. Check them for continuity after you replace the IC's. By the way, did you use good replacement IC's for the convergence? There are all sorts of aftermarket types and factory rejects being sold out there via the web or from local electronic parts distributors. Make sure they are the original types. If you know how to read a schematic diagram, but do not have the service manual, let me know, leave an e-mail address, and I will be happy to send you some info on the replacement of the ICs as well as the factory service manual. Good Luck!

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This is convergence bord problem and you need to replace the STKs and check all resistors around the two stks and replace the faulty ones. If you are not too confident, its better to seek professional help. some indication of costs are available on www.fixurtvs.com. You can download service manual from fixya site tech support and decide what you want.

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Your TV most likely has one or more 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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