Question about Toshiba 42H81 42" Rear Projection Television

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Toshiba 42H81 Rear projection "Convergence problem"

TV set is about 5 ys old, and it looks kind of like 3-d tried the touch focus and get error, tried the manual focus and can not move red left or right. I need help. Thanks

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  • hecc24 Aug 31, 2008

    I am totally lost I opened the back of my big screen and could not tell where the IC's chips are. I would like to see pics and diagrams if possible. Thanks


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Also,check micro fuses F851,F852,etc.
and with a good digital meter, check resistors feeding B+ to
convergence circuit.
I have been using Stk392-110T made by Toshiba with no re-calls.Hitachi also has an upgrade IC.
And be sure to check your soldering of IC pins--good connect,
with no short.....T.

Posted on Oct 25, 2007

  • Vista Electronics Oct 25, 2007

    PS. Near the edge of the signal board, there are two metal

    jumper wires that feed B+ to convergence IC's-be sure to solder them.

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One of your convergence IC's has burned out and needs to be replaced. A good rule here is to go ahead and replace both STK392-110 IC's with the new improved STK392-150's. If you have never replaced convergence IC's and realigned convergence circuits, allow a qualified tech to handle it for you.

Posted on Aug 14, 2007

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1 Answer

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

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

1 Answer

When the TV is on, on the outlines of people and text are in Red and Green lines. I have tried the touch focus and it is not working. it is saying that there is a "touch focus error" can I manually adjust...


you need 2 new convergence chips, part number stk 392-110, also check for burnt up resistors next to the chips, major disassembly and soldering, you probably need a tv repairman.

Sep 24, 2009 | Toshiba 42H81 42" Rear Projection...

1 Answer

Toshiba TV Model 42H81 will not focus


Ur convergence it dead.Buy the kit and replace the ICS an the resister.Focus don't go that far.

Aug 11, 2009 | Toshiba 42H81 42" Rear Projection...

1 Answer

2002 Toshiba 42H81 color blue will not align


one of the amplifiers on the convergence circuit is not working

Dec 02, 2008 | Toshiba 42H81 42" Rear Projection...

1 Answer

CONVERGENCE PROBLEMS


You need to replace the convergence ICs there are two of them. they are STK392-110 you can get replacement ICs at the following link and they provide free instalation instructions with pictures so you can do the job yourself and save about 400.00 Heres the link.
http://servicemanuals.vstore.ca/

May 18, 2008 | Toshiba 42H81 42" Rear Projection...

1 Answer

Still green


go In service convergence mode and try to adjust red and green if you cant then it's convergance amp ic's
if you can adjust them so they align up try doing a touch fous after that,.

Dec 16, 2007 | Toshiba 42H81 42" Rear Projection...

1 Answer

42H81 touch focus error


check for bad solder connections on the connvergence ics if that dont fix it then replace them

Nov 01, 2007 | Toshiba 42H81 42" Rear Projection...

1 Answer

Toshiba 42H81 Red Vertical bar on right side


The symptom suggest a faulty converge ic.you need to replace that ic ( stk392-110 ).

Aug 06, 2007 | Toshiba 42H81 42" Rear Projection...

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