Question about Sony KP-43T90 43" Rear Projection Television

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Which ic's replacement

Convergance IC Replacement which? see picture in kp-43t90 section

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Re: which ic's replacement

I dont see them on this pic

i just looked at the schmatics and they are stk392-150. they are located on the G board ic1502 and ic1506

Posted on Oct 13, 2007

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Distorted picture and color

This kind of problem occurs due to failure of convergence output ICs in Sony KP-51HW40 tv.
Replace convergence output ICs to solve tv problem.
This set uses two of the STK-392-570 IC chips for this (convergence problem)
Local tv repairman will do this job if you have no experience of electronics stuff repair.

Dec 22, 2010 | Sony KP-51HW40 51" Rear Projection...

3 Answers

I bought a used Sony TV that I love, but the picture had a double vision. It does not line up and it has a shadow vison all the time. I tried the Flash Focus but it doesn't change anything. the Model NO...

Your best bet is to have a professional come out and align the guns professionally. It runs 100-150$ for them to come to your house and do it. If you need anything else let me know.

Aug 24, 2008 | Sony Projection Televisions


Replacement of Convergence IC'S

If your picture looks 3D then you most likely have a CONVERGENCE IC that is bad or a fuse that supplies 12vdc or 25vdc to that IC IS OPEN. Also keep in mind it could be a FRACTURED solder connections. The cost of the IC varies depending on which one it is.

on Feb 18, 2008 | Sony KP-46WT500 46" Rear Projection...

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Double image on my Sony KP 43t90

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

Dec 20, 2010 | Sony KP-43T90 43" Rear Projection...

1 Answer

The blu display on my sony 65" tv is arched, making the convergence adjustment in-effective.

its failure of Convergence Out IC chip and requires replacement.
TV has 2 IC chip in convergence circuit and I would recommend to replace both at same time.
Let me know exact model of Sony 65" TV to provide you more technical info.

Mar 14, 2009 | Sony KP-51WS510 51" Rear Projection...

1 Answer

Sony KP-53XBR45 convergence

Hey, found the problem. Your Convergence IC chip went bad. Buy one at Bluestar International Components ( - order part number STK392-010 for 6.99. I've read that there are two in the system and replacing them both at same time is a good, order 2. Now, if you are handy, it will require you to open the back of the TV and solder out the old chip and replace with new. If not, then you might as well call a TV repair person and have them fix. However, every place I've called works on a minimum fee for "large screen TVs" - the cheapest I could find in Atlanta was $399 minimum service fee. So, I'm going to risk the home sodering job .... it's a 10 year old TV and as good as it's been to me, if I screw it up, I feel I've gotten my money out of it. Good luck with your repair. My parts are on order.

Oct 15, 2008 | Sony KP-53XBR45 53" Rear Projection...

2 Answers

Is this a Convergence problem? With picture

Yeah, it is convergence. You can try a IC replacement yourself if you can solder and hour 3-5 hours to spare. Parts are $12-$60, depending on brand and quality. There are a few places that sell a repaired board for $140.00 and up.

Aug 20, 2008 | Sony KP-51WS500 51" Rear Projection...

1 Answer

KP43T90 convergence

Check the resistors that are right next to the ICs one or two of the resistors will usually go open along with The convergence ICs.

May 10, 2008 | Sony KP-43T90 43" Rear Projection...

1 Answer

I have No picture but I have audio

have the tech look at your tv once again your problem is in the video section.the ic that controls that and the related circuit are not working parts needs to be replaced.good luck.

Apr 01, 2007 | Sony KP-53V45 53" Rear Projection...

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