Question about Toshiba 50HX81 50" Rear Projection Television

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Toshiba tv when i hit the focus button it go through the proess and it just comes up with error and the red line is out of line and wavy.

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Re: toshiba tv

Convergance amp ic bad.

Posted on Jan 07, 2008

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"touch focus error" appears when the test is completed. There is a double effect showing on the pictures and the words. What can be done to fix this?

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 projection 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.



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


You can see some more examples and find a fix using this link on Fixya

Aug 14, 2010 | Toshiba 65HDX82 65" Rear Projection...

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Toshiba 57hx81 tv has a bow at bottom of screen and blue in color tried using toush focus & got error then tried to focus manually & couldn't get the bottom lines to focus all the way down

noted in the owners manual, if auto focus returns message "error" , it suggests to use manual convergence setting..failing that, is it resonable to suspect that the STK-392-110 (convergence (2)chips)are beginning to fail, bendt horizonital lines is the effect. you can check all the resistors and pico fuses (power board)near the chips for shorts, chances are they are ok. seeing that there is somewhat of a picture (kinda like 3-d). i would repaired it!.. while your there do the hyperboard repair as well by replacing the 10 caps with 16v@10uf. (causing a wavy vertical distortion effect).

Jan 12, 2010 | Toshiba 57HX81 57" Rear Projection...

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Convergence issues with Toshiba 42H83 - Red lines will not align

Absolutely! if the consumer control has failed to rectify the problem you need expert help. There are two control boards near the power supply 1 or both are involved and more than 90% of the time both of the boards have to be replace otherwise the problem will occur again in a short time.
It is not a DIY project for the unskilled as it has to be tuned correctly when it is installed.
Better to leave it to the professional

Please rate the help to keep the FREE service online ++++

Aug 31, 2009 | Toshiba 42H83 42" Rear Projection...

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Blue shadows/ghosts

how old is the tv ??
if this tv is older than 5 years it may need to refill the liquid on the proyection bulbs and/or could have contaminats in the fluid causing the ghost and to fix that you will need a professional person to do it

Apr 03, 2008 | Toshiba TP55H60 55" Rear Projection...

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Can not foucus the colors

What model set do you have ? Its probaly convergence ICs faulty.

Jan 07, 2008 | Projection Televisions

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Wavy, jumpy picture, ghosts, occasional color loss/change---you name it!

Convergence amp ic bad

Dec 12, 2007 | Toshiba 50H81 50" Rear Projection...

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Toshiba Rear Projection 42 "

Nov 23, 2007 | Toshiba 50H72 50" Rear Projection...

1 Answer

Toshiba 42 inch rear projection

Nov 23, 2007 | Toshiba 55H70 55" Rear Projection...

1 Answer

Suspected Convergence Issue on Toshiba 51H83?

Needs chassis pull & convergence IC's replaced....then
Touch Focus will work again..................T.

Nov 19, 2007 | Toshiba 51H83 51" Rear Projection...

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