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

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Television is out of whack

My kp 43t90 sony tv has a line bending down in the top left hand corner and is showing the images with shadows and it looks like double vision

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Convergence chips are bad. Goto to get a repair kit

Posted on Feb 28, 2009


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Posted on Jan 02, 2017


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My sony kp-43t90 is blury

Convergence problem and because of age of set may not be worth shop sells kits based on model number for this.

Nov 04, 2012 | Sony KP-43T90 43" Rear Projection...

1 Answer

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

Double vision on a sony kp-43t90?

you likly have a convergence problem (is that a crt projection TV?)

Sep 18, 2009 | Sony KP-43T90 43" Rear Projection...

1 Answer

Sony KP 43T90 Projection TV - use headphone

so u bought red white femail rca cables to mini sterio jack or bigger headphone style make sure tvs menu shows outoput on audio out on if u have option should be all it needs turn tv up after

Oct 06, 2008 | Sony KP-43T90 43" Rear Projection...

1 Answer

Sony KP-43T90 43 in TV only works with DVD but not with cable or antenna

Connect cable at RF input and please perform Auto Search in TV Menu to search available TV channels transmission and still no signal reception means Tuner is defective in TV.

Sep 04, 2008 | Sony KP-43T90 43" Rear Projection...

1 Answer

Wavy Lines

some type of electrical feedback try upgrading your cables or tightening the ones you have. what might work best is a line conditioner i filters out any feedback you may be getting and cleans your power supply they cost from 50.00 and up best buy or circiut city both carry them or online as well

Jul 17, 2008 | Sony KP-53HS10 TV

1 Answer

Sony tv

The issue is most likely a bad bulb. If the light that you are getting is flashing red than most likely it is a bad lamp. If this is the case you are looking at probably $200-350 dollars.

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

1 Answer

Green Shadow

Sounds like your green panel is out of alignment. Has the TV been moved or jarred recently?

Generally speaking rear-projection panel alignments need to be done internally by professionals. Check for a local TV technician that specializes in projection TVs.

Apr 07, 2008 | Sony KP-43T90 43" Rear Projection...

1 Answer


this problem is caused by the pal 50 - 60 meg problem, the sony runs at 50 megs, if you have a 60 input from an hdmi lead you will get ghosting

Mar 05, 2008 | Sony KP-43T90 43" Rear Projection...

1 Answer

Color distortion

There are failures occuring in the scann and convergence circuits. This may not be feasible to service.

Jerry G.

Dec 14, 2007 | Sony KP-43T90 43" Rear Projection...

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