Question about Toshiba 43HX70 43" Rear Projection Television

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Toshiba 43HX70 convergence fix - now no video

Hi! I've done the old tried and true replacement of the convergence STK ICs and the blue would not adjust horizontally so I also replaced all the resistors. No Help.  I then replaced the two ICs again with new ones. Now I have audio but no video at all.

The service manual mentions the 6 resistors are 1.2 Ohms but I've noticed the 2 on the outside edges appear to be a different color code than the other 4. The video still worked after changing resistors but didn't work after changing out the ICs again. Any idea what could be causing my 'no video' issue now?

I suspect I could've also blown a fuse (high voltage?) and if that causes no video, any idea where the fuse(s) are?


Thanks in advance!

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Re: Toshiba 43HX70 convergence fix - now no video - Toshiba 43HX70 43" Rear Projection Television Projection Televisions

How do i test the IC chips?...

Posted on Jan 29, 2008

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Re: Toshiba 43HX70 convergence fix - now no video

I think the hardest to solve problems are those I installed!!
Where do we start==no lecture,but I never change a resistor
unless it has changed (in value!) Use a digital meter and check
the value of each resistor.Toshiba is a bit confusing as to values
of each resistor and location in relation to the IC's.Go over your own work first.Check micro fuses in power supply=F851,F852,
etc. Carefully resolder steel jumper wires at board edge,they feed
B+ to convergence amp circuit.Be sure to verify no shorts in pins
of IC's.(use your meter).........T

Posted on Oct 25, 2007

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Focus Error I am getting double picture and the colors are off. When trying to auto focus the blue lines are wavy.

Replace Convergence ICs ,Big black ICs will have PN# on them example STK 392-110
Mats has ICs 1-800-628-1118

Jun 05, 2011 | Toshiba 42H82 42" Rear Projection...

1 Answer

The picture is warped red & blues distorted

Your Convergence ICs have failed. It is very common on rear projections. The solution is to replace the STK chips, check fuses and the resistors next to the STK chips. Replace as necessary and re-align via the service menu. It is about a $300 repair at a tv service center. You will need the service manual if you decide to do this yourself.

Try This:
When you notice the symptons Use this simple test to verify.
Go to the users menu on the tv.
Look for the converge option probably under setup or video setting. Converge is short for convergence to align the red and blue colors to the green color.

If you cannot move the red either horizontal or vertical, then the STK chip has failed for red section.
If you cannot move the blue either horizontal or vertical, then the STK chip has failed for the blue section.

If you can move both in each direction then the problem is something else.

Note if one STK chip fails, you replace both regardless. They will be right next to each other.

Feb 20, 2011 | Toshiba 57H81 57" Rear Projection...

1 Answer

Convergence function reads error

Check the 1.8 ohm resistors in the convergence circuit there will be 6 all 1.8ohms, They will be where your STK ICs are
STK392-110s which are Big Black ICs,You may need to replace ICs They are Big Black ICs with STK392-110 printed on them Mats has them 1-800-628-1118

May 30, 2010 | Toshiba 51H83 51" Rear Projection...

1 Answer

Convergence problem w/55h70. red is ok but can't fix blue. Is there a component or board that is easily replaced?

Yes,U have some basic machanicals skills?The Toshiba Tv convergence board,it call a Hyper board.Try website to buy a refurbish board.This board no longer produced by Toshiba,if can't find it.The Convergence 2 STK ICS,and some or all it resistors,must replaced manually.Must have tools,and knowing how to do basic soldering,to do this.

Apr 06, 2010 | Toshiba 55H70 55" Rear Projection...

1 Answer

Toshiba 43HX70 convergence problem

One or both of the STK convergence chips have probably failed.

I can give you guidance on this if you are confident to do the repair. I had the same problem with my Tosh 40WH08B and after replacing these chips it works like new.

May 21, 2009 | Toshiba Projection Televisions

1 Answer

Toshiba 43HX70 convergence problem

Yes its actually a very easy repair. You need two STK392-110 Convergence ICs and six 1.2 ohm 2watt resistors. You can get the replacement parts and instructions at the following link.

Apr 27, 2009 | Toshiba 53H71 53 in. Rear Projection...

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Blue halo on bottom 1/3 - Convergence issue with my 43HX70


Aug 13, 2008 | Toshiba 43HX70 43" Rear Projection...

1 Answer

Convergence problem?

you need to replace both convergence ICs 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. Heres the link.

May 25, 2008 | Toshiba 43HX70 43" Rear Projection...

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