Question about Toshiba 42H81 42" Rear Projection Television

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Toshiba 42h81 When I try to do the convergence a few of the green "X"s are not where they should be and I can not match them. When I called a repair shop they said it was something that comminly goes out that costs like $400.00. I am just hoping to find a cheaper way to fix it. I have a 42h81 as well with a similar problem. The blue has a "double image" and I cant get it to converge at all. There is a board in the back of the TV with connectors for the three crt's. I unplugged the blue and the double image goes away but the blue is then too big and I cant get it to fit behind the other colors. Please advise???

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  • HecklerZ Dec 03, 2007

    I could have someone at work replace the resistors on the board for me. (Laser Lab for Energetics). If you could guide me in the right direction. I could send you a photo if that would help.

  • HecklerZ Dec 03, 2007

    Also that first paragraph was someone elses post. I do have a bit of DIY experience. Thanks in advance for any info you could pass my way!!



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Heckler, your tv has blown parts in the convergence circuit so you need to stop pulling plugs or you will do more damage to the set. The convergence IC`s will need to be replaced and probably 1 or 2 support resistors, Then the set will have to be re-converged, the shop you talked to is correct that it`s a common problem, mine failed 8 months ago in my 53" Hitachi. $400 to do that repair is pretty pricey BUT it really depends on where you live, Major sized city`s charge big rent, taxes are higher etc. etc. so tv shops overhead is higher, I would get out the phone book and start calling all the shops in your area for price quotes. Any questions??? email me back, hope this helped, Happy Holidays BMW Rider

Posted on Dec 01, 2007

  • Larry Eastman
    Larry Eastman Dec 04, 2007

    Heckler, your set uses STK392-110`s for convergence amps, there should be 2 of these side by side on a large, finned, aluminum heatsink, Depending on which type of clamp system they use on this one will determine if you can read the "STK392-110" on the front of these very large IC`s. As for the resistors I hope they have volt/Ohm meters at your work to test them, they have to be within 1 % of the rated value or they should be changed, the problem is I have no way to tell you which if any are bad, they all have to have one leg pulled and then be measured 1 at a time. If you decide to pull this board out and bring it in be SURE to color code every plug/socket you remove so you put everything back EXACTLY where it belongs or your doing all of this for nothing, you should order the IC`s and any resistors you may need here 800-575-9833 they don`t sell generic chinese IC`s and many many places on the internet do, this isn`t impossible for a lay person to do but it won`t be easy either, if u have digital camera use it as you remove the board it will help immensly when you go to re-install, questions ? ask away, I`ll try to help , Larry

  • Larry Eastman
    Larry Eastman Dec 04, 2007

    Almost forgot, you will need to purchase a tube of "heatsink compound" (waste of your money but you HAVE to use it or the IC`s will overheat and fail in a month). It`s white in color and who ever removes the stk`s from the heatsink must remove the old heatsink compound and then apply a THIN coat of the new compound over the metal back of the new ic`s



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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 herebb0cf99.png

Apr 14, 2010 | Toshiba 42H81 42" Rear Projection...

1 Answer

Toshiba model 42H81 projection tv receiving blue and yellow shadows on screen.

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

Feb 06, 2010 | Toshiba 42H81 42" Rear Projection...

1 Answer

Lines on both sides of screen blurry images. Sometimes when I turn it on It has very bad lines, but it clears up in a few minutes.

Ur convergence is dying,well be dead,know how to solders?Must replaced convergence ICs and all it resistors.Tries websites Tv repair, for the convergence kit.

Jan 21, 2010 | Toshiba 42H81 42" Rear Projection...

1 Answer

Convergence problems

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

May 29, 2008 | Toshiba 42H81 42" Rear Projection...

1 Answer


you have a convergence problem that will require the replacement of the convergence amp ics.

Nov 29, 2007 | Toshiba 51H83 51" Rear Projection...

1 Answer

Toshiba Model # 42H81 Picture Problem

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.

Nov 25, 2007 | Toshiba 42H81 42" Rear Projection...

1 Answer

Toshiba 42H81 42 in. Rear...

If you are referring to the convergence alignment of red,green and blue........will require technical and mechanical skills.....
1) Pull chassis
2) Replace both STK392-110 convergence IC's
3) Reset alignment as needed........................................T.

Nov 23, 2007 | Toshiba 42H81 42" Rear Projection...

1 Answer

Toshiba 42h81

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

Nov 07, 2007 | Toshiba 42H81 42" Rear Projection...

1 Answer

Toshiba 42h81 picture shifted

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

Jul 31, 2007 | Toshiba 42H81 42" Rear Projection...

1 Answer



May 12, 2007 | Toshiba 42H81 42" Rear Projection...

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