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Will not 'Touch Focus' - Toshiba 42H83

Have a Toshiba 42H83 that will not 'Touch Focus' - I can go in and manually converge it with no problem. I have also noticed that during the 'Touch Focus' that the red and green lines are nice and tight, were the blue line is not. I just replaced the convergence IC's with stk392-150 (had 110 in it) using the thermal grease etc. Any help would be great!

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Re: Will not 'Touch Focus' - Toshiba 42H83

1)I have yet to learn any advantage to replacing -110's with -150's
I think there is a misconception that increasing numbers =
better,more durable results....Actually, using OEM or better
quality should be most important.Generics from any source
tend to be seconds,thirds, junk ! Name brand are first quality
2)Check B+ feed resistors next to convergence IC's = burnt ?

3)Solder wire jumpers on signal board = 008,010,017,600,etc.
prevent maitenance

Posted on Dec 20, 2007

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Toshiba 42h83.... The blue convergence will not line up. The horizontal will but the vertical will only move so far. when touch focus starts the reds and greens are perfectly strait the blue vertical is...


Initially I would have told you to replace the convergence ICs but after reading your post carefully I think you could have a problem with the convergence box. The lines can only be bent/curved for two reasons. One - the yokes are bad causing an undue strain on the power supply and not being able to correct the problem. Two - the convergence box/board is bad and is not holding the settings causing the curve you see. I cannot tell you which problem you have. You wil have to determine this. I do have a tip at which may be helpful.

Thanks for using FixYa and for the great rating.


Dec 08, 2010 | Toshiba 42H83 42" Rear Projection...

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My Toshiba 42H83 has developed a color problem. The color blue is about an inch off the other colors, the picture looks like a 3d movie without the glasses. I have used the touch focus button on the...

Alot of rear projection t.v.'s have a convergence option in the menu on the t.v. There you can set the try to set the colors back how their supposed to. Mine has a cross in the middle of the screen and you just have to try to get all 3 colors to line up. Unfortunately, the actual lens inside mine has to be aligned so it doesnt work. Just something to try though, hope it helps.

Jan 05, 2010 | Toshiba 42H83 42" Rear Projection...

1 Answer

I have blue archimg on the bottom of my 42h83.

replace the two STK392-110 convergence Ics and the six 1.8 ohm 1watt resistors.

Dec 06, 2009 | Projection Televisions

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Colours on the right side are unbalanced

run auto convergance from the menu it might be called touch focus on that model

Nov 21, 2009 | Toshiba 42H83 42" Rear Projection...

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Convergence issues with Toshiba 42H83 - Red lines will not align

Absolutely! if the consumer control has failed to rectify the problem you need expert help. There are two control boards near the power supply 1 or both are involved and more than 90% of the time both of the boards have to be replace otherwise the problem will occur again in a short time.
It is not a DIY project for the unskilled as it has to be tuned correctly when it is installed.
Better to leave it to the professional

Please rate the help to keep the FREE service online ++++

Aug 31, 2009 | Toshiba 42H83 42" Rear Projection...

1 Answer

Toshiba 42H83 Touch Focus Problem

I just got finished repairing the same model . The convergence modules are bad cost of repair is 250.00 for a service center to fix. My advice would be call your local service center tell them what i told you bad convergence ic and ask them how much they charge,

thanks doctor video good luck since 1987

Jun 14, 2008 | Toshiba 42H83 42" Rear Projection...

1 Answer

Double outline "red" around images

Hi you have bad convergence ic stk modules ,Cost for repair center to fix is 250.00. call your local repair center ask there prices on convergence ic repair. It is a very common problem every 3 to 5 years .Our service center does a lot of these.

thanks doctor video 1987

Jun 01, 2008 | Toshiba 42H83 42" Rear Projection...

2 Answers

Toshiba 42 inch rear projection T.V.

this sounds like a convergence loss... the most likely cause of this is what is known as stk's or convergenc ic(chips) have gone bad.. also it cound be the output resistors. most likely need replaced

May 12, 2008 | Toshiba 42H83 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...

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