Question about Toshiba 42H81 42" Rear Projection Television

Toshiba 42h81 picture shifted

A few days ago the picture shifted off center to the right. As a result of the convergence is off, green shadow around white objects and the overall picture is much darker. I have used the service menu to try and correct the convergence but it hasn't help much. Would resetting the HPOS back to the original code help? Does anyone have the default values for the 42H81? Thank you Henry

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1,694 Answers

Are you still working on your set? I can help......T.

Posted on Nov 23, 2007

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1 Answer

The picture is "ghosting" or doubled

The tv have a problems known as a convergence problems,it dead.The tv have 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 it resistors too.These parts on the tv convergence board,must be replaced to solved the tv picture convergence problems.The shop,will cost like $300-350 for parts and labors.

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

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This is a convergence failure, common on this type of tv. here is a tutorial I made:
http://www.fixya.com/support/r5001731-convergence_diagnosing_convergence
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My picture is wavy and out of focus. when i touch the auto focus it goes through the function but ends with failure. it is a toshiba 42h81.

The most likely cause is shorted convergence chips and possibly a few pico fuses.

These sets need to have all three colors - RED - BLUE - GREEN - lined up correctly on the screen in order for the picture to look normal. This is called convergence.

When its out of alignment the video will look 3-D, wavy, distorted, etc. Most of the time you just need to adjust your convergence in the menu. If you cannot adjust it in the menu - then your convergence is broken and needs to be repaired. Convergence problems are very common on all Projection TV sets including Sony,Samsung,JVC,Philip Magnavox,Panasonic,Akai,Pioneer Hitachi,Mitsubishi,Zenith and others.
You can get a convergenece repair kit with instructions from the links below.

Here are some of the most common problems with these sets...

Problem #1) Convergence

Yours may have one or more of the following symptoms...

*Screen Looks 3-D
*Colors wont align
*Screen may look distorted or warped
*No Audio/Video - TV Shuts down - May also make a constant chirping sound

Problem #2
Another common problem is dull or washed out video.

Your set may have one or more of the following symptoms....

*Dull looking picture
*White looking picture
*Halos around objects
*Red/Orange looking picture

You can see some more examples and find a fix here

http://www.fixya.com/support/r2861467-solution_video_looking_whiteish_dull

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Convergence is dead.Know how to solders?Must replaced the 2 convergence ICS and all it resistors.Tv Repair World.com,Tvrepairkits.com to buy a convergence kit to repair it ur self.The shop will cost u $300 for parts and labors.

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You have convergence output failure. The output ICs will need to be replaced and possibly a small component like a resistor or two as well. Expect to pay a service company $350-$450 to resolve this.

michtech

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1 Answer

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you need to replace both of your convergence ICs they are STK392-110 you can get new replacements at the following link and they provide free instalation instructions with pictures. Heres the link
http://servicemanuals.vstore.ca/

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1 Answer

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Can you describe the issue a little more? It may be a convergence issue which is quite common on big screens. But there are quite a few issues that can cause a bad picture.

If it's convergence, you'll be able to tell by going to a news channel and looking at the text. If the convergence is bad you'll see a ghosting like image of 2 or 3 letters for each one that should be there.

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Replace convergence IC's = requires chassis removal =
Usually about a 400.00 job.................T.

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