Question about Toshiba TW56X81 56" Rear Projection Television

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Toshiba TW56X81 Convergence issues

Couple of days ago my Toshiba TW56X81 TV started having a major convergence problem. The Red is way off with a Bow at the left end of the screen. This definitely cannot be fixed with the standard convergence settings screen in the menu as I have learnt. Wondering what could be wrong here. Reading on the net it seem like it might be the Lens IC. Wanted to verify if that is a likely area . Also looking to find a service manual for this TV. any pointers on where to get one online. Have tried multiple places and nobody seems to have it. Thanks in advance

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234cataract

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I retired from the TV repair business because if you are not an authorized repair service center most manufacturers will not even talk to you. If you are electronically inclined you can repair this tv. your problem is a bad convergence ic. you need to be able to locate it and replace it. it probably has about 15 or 18 legs that need to be unsoldered and a new replacement re-installed

Posted on Sep 29, 2007

  • 234cataract Sep 29, 2007

    there will be two of these ic's replace them both

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On the screen I see on the sides of every object a shadow, it,s green on the left side and red on the right side accompanied by some little horizontal red stripes. It started doing it all of a sudden a...


The tv have a problems known as a convergence problems,it dead.The tv colors lines R,G,B mis alignment,have colors shadows pictures or 3D pictures look alike.The tv convergence board have dead 2 STK convergence ICS and some or all of it resistors too.These parts on the tv convergence board,must be replaced to solved the tv picture convergence problems.The shop,will cost u like $300-350 for parts and labors.

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Convergence IC's need replacement = STK392-110 original #...
Use name brand Toshiba, NAP, or upgrade to STK394-160E
Hitachi part # CZ 01341...no cheap generics..they won't hold up..
Chassis pull and some precision soldering will be needed....let me know if you need further info...........................T.

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Thanks for this forum.

I have a Toshiba 48" rear projection TV which started to show red and green lines on the left side of the screen and have also started affecting the left-hand focus of the image shown on the screen. I have had this TV for 14 years and had a projection adjustment done once before.

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Projection TV sets need to have all three colors - RED - BLUE - GREEN - lined up correctly on the screen in order for the video to look normal. When its out of alignment the video will look 3D, wavy, distorted, etc. Most of the time you just need to adjust your convergence in the TV menu. If you cannot adjust it in the menu - then your convergence is broken and needs to be repaired.

This is a very common failure on these projection sets and a fairly simple DIY fix. All projeciton sets including Samsung, RCA, Sony, Philip Magnavox, Panasonic, Pioneer, Akai, GE, JVC, Toshiba, and others at some point will have the same problem.

Common Symptoms include....
  • 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.
  • TV shuts off after powering on. Power light will blink. TV may also make a chirping noise.
Here are some photos of convergence problems.

42d3683.jpg

7859b01.jpg

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Here is a quick test....

Using your original remote go-to the settings menu then goto the convergence section.

Try to adjust the red and then the blue convergence.

You should be able to move RED and BLUE in all directions - up, down, left, and right. And you should be able to get the grid straight.

If you can't move them in all directions or cant move them far enough your convergence chips are bad and should be replaced. This is a common problem.

Note: If you TV has as flash focus or magic focus button only try pressing the button. If it fails to fix the convergence your need to fix it. See below for a fix

69189a5.pngCONVERGENCE SOLUTION

You will need to replace the convergence chips and possibly some convergence resistors and pico fuses.
This is a a fairly easy DIY job if you are handy and can follow directions. You can get complete repair kits from TvRepairKits.com or click here. They have put together DIY repair kits that include the OEM parts and step by step photo instructions for each repair. If you are not handy or can't follow directions we would suggest calling a shop.

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http://home.earthlink.net/~oleg.filippov/ConvergenceFix.htm
http://cmpalmer.blogspot.com/2006/11/fixing-my-own-tv-part-ii.html

convergence amp ic are going replace them before you have more problems

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Lost of high voltage on the vertical amp was caused the bowing. That was a simple tweak. I'm sorry to tell you that the high voltage adjustments are rather precise and have major interaction with each other. The HV circuit is also used to power low voltage circuits to gain efficiency. If one or more are not within spec, the process to recovery will require bench alignment of the various stages. Seek professional help or consider replacing. Good luck

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