Question about Toshiba 42H81 42" Rear Projection Television

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Re: 42H81

Which of these parts were know to be bad?
are you sure your soldering is good on the IC's?
check hv output transistor see if shorted, kinda follow this thread see what you find.

Posted on Dec 19, 2007

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Red lamp is out of Focus and the red is curved on the bottom left hand side of the screen. Auto Focus shows error. What could cause this to happen.

Ur convergence is dead.Must know how to solders?Must change ICS and all it resistors in the convergence board.Tries Tv repair, for the convergence kit.The shop will cost u $300 parts and labors.

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

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My Toshiba 42H81 has no picture and has a red blinking light by the power button. Still have the audio from my Tivo coming in but no picture!

If it shuts off and then the power light starts blinking red or if it never gets picture and the power light blinks red constantly that is usually indicative of the convergence ICs (STK 392-110). You never want to replace the ICs without also replacing the resistors that are associated with them. There are usually 6 resistors, one for each of the colors and there corresponding direction, IE Red horizontal, red vertical, blue horizontal, ect. You will find them right where the STK 392-110 ICs are. Right in front of them. You can get the parts from They carry the ICs and the resistors. If you do not feel comfortable completing this repair I could do it for you if you send me the board. My email address is: Cost = 375.00 and that includes all parts.
Good Luck.

Jun 25, 2009 | Toshiba 42H81 42" Rear Projection...

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Toshiba TP43H60 Convergence Problem

This may sound odd but try moving the remote further from the set. I have seen similar issue with my 42H81.

Jun 01, 2009 | Toshiba TP43H60 43" Television

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42H81 Convergence issues

I've seen a few shorted convergence yokes in toshibas. Sometimes after running the TV for a few minutes, you can feel the relative temperature of the 3 yokes to tell which is overheating and therefore shorted. Don't forget to re-check all the low resistance resistors around the convergence ICs to make sure that the are within the 5% tolerance rating they should be. Also on some of these models, there is a jumper wire located near one of the ICs that develops an intermittent solder connection.


Feb 14, 2009 | Toshiba 42H81 42" Rear Projection...

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Red Convergence Hairs will not move side to side. do move up and down

It's most likely the Ic's but do test the return resistors for any change in value before closing it up.. It will add a greater reliability to the repair.

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

Oct 24, 2008 | Toshiba 42H81 42" Rear Projection...

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Toshiba 42h81

STK392-110 's = replace with Toshiba or Sanyo quality only..
What was the location & value of the resistor ?
An IC, if shorted internally,can prevent the tv from powering up..
Re-check soldered in 5 amp micro fuses F850,851,852,etc
Fix it ! ..............................T.

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

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Toshiba convergence

this sounds like me to be a output resistor..these are usally half watt resistors next to the convergence ics. the fact that you can move the convegence hairs side to side indicates that the ics are still good. i have tried to located the resistor on schematic... i know that they are the big one next to the stk ic these are the big ones on the big heat sinks. 1 watt i beieve. im going to keep looking

Mar 15, 2008 | Toshiba 42H81 42" Rear Projection...

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Red line

Need convergence IC's and probably several resistors that have changed value. Seek professional help, someone who uses ORIGINAL ic's, not generic or knock-offs

Jan 03, 2008 | 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...

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