Question about Toshiba 42H81 42" Rear Projection Television

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42H81 touch focus error

I have a 5 year old 42h81 and the blue line is waving . I tried doing a touch focus and it error.  I went to the service mode and did a manual realignment but I cant even move the blue gun.  The Blue is way off from the grid.  What can I do to repair this?

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Re: 42H81 touch focus error

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

Posted on Nov 03, 2007

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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...

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Convergence -manual

Replace the convergence amps and test and replace any or all of the 2.2ohm resistors in the yoke return path out in front of the amps. This unit takes two STK392-110 Sanyo originals, DO NOT GET CHINESE KNOCK-OFFS... Buy them from Acme sales out of Florida and you can be assured they're originals.

William Rayburn, CET
Premium Technologies
PO Box 442
Long Beach, WA. 98631

Oct 11, 2008 | Toshiba 42H81 42" Rear Projection...

1 Answer

42h81 touch focus error

You can get one at the following link, they are not free but the tech support they offer with the manual purchase is free.

May 28, 2008 | Toshiba 42H81 42" Rear Projection...

1 Answer

My toshiba 42h81

Your convergence amplifiers have failed. There are lots of posts on this site for this problem. Take a look at this link:

There are a couple of links on this post that you will find helpful if you want to repair this yourself.

If you have more questions just ask.

Dec 28, 2007 | Toshiba 42H81 42" Rear Projection...

1 Answer


I am having the same problem with my red lamp. i get an error on the touch focus and I cannot manually converge the red lamp.
let me know if you find out a way to fix the problem


Dec 27, 2007 | Toshiba 42H83 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

Dark Picture on my 5 year old 42H81

Any horizontal or sqiiggly lines in the picture or just a loss of light level?

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

2 Answers

Toshiba 42H81 Rear projection "Convergence problem"

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.

Aug 13, 2007 | Toshiba 42H81 42" Rear Projection...

1 Answer

Toshiba 42H81 Red Vertical bar on right side

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

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

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