Question about Toshiba 43H70 43" Rear Projection Television

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Resetting convergence daily on Toshiba 43h70

I have to enter the convergence setting and move the red/blue lines a couple of times a day. The set can be adjusted but it doesn't last long. The TV is still viewable but the HD is not as clear as it should be. What options do I have to fix it? Again, up until a couple of weeks ago I never had to touch the convergence setting and now I have to adjust it 2-3 times a day.

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Re: Resetting convergence daily on Toshiba 43h70

Hi Mark, tough call without putting a scope to the circuit, either the convergence IC`s are going bad, signal from DCU is going bad (digital convergence unit), or possibly bad solder somewhere in the convergence circuit, I`m afraid your going to need a tv tech for that problem, BMW Rider

Posted on Jan 04, 2008

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My Toshiba 43H70 started having the blue bow up at the bottom. Green and red are good. Convergence will move it a little, but not enough. Any ideas?

Your convergence has failed and needs to be repaired. Once quick test is to goto your convergence menu and see if you can adjust red and blue. If not its has failed and needs to be fixed. You can call in a repair shop or you can get the parts and instructions from and do the repair yourself. Its a fairly easy DIY fix.

Jul 18, 2011 | Toshiba 43H70 43" Rear Projection...

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This tv the convergence board are dead.Any colors R,G,B mis alignment,don't matches any colors lines.The tv convergence board the 2 STK convergence ICS and some or all it resistors are dead.These parts are dead,must be replaced to solved convergence problems.The Shop will cost u $300-350 for parts and labors.

Jul 08, 2010 | Toshiba 43H70 43" Rear Projection...

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Picture on screen doubles and there's red highlights at the bottom of the screen. Tried to fix with convergence but did not work. Model # TZ50V61. Please help me.

Projection TV sets need to have all three colors - RED - BLUE - GREEN - lined up correctly on the screen in order for the video to look normal. When its out of alignment the video will look 3D, wavy, distorted, etc. Most of the time you just need to adjust your convergence in the TV menu. If you cannot adjust it in the menu - then your convergence is broken and needs to be repaired.

This is a very common failure on these projection sets and a fairly simple DIY fix. All projeciton sets including Samsung, RCA, Sony, Philip Magnavox, Panasonic, Pioneer, Akai, GE, JVC, Toshiba, and others at some point will have the same problem.

Common Symptoms include....
  • Screen looks 3D
  • Colors don't line up
  • One or more colors can't be adjusted when using the convergence menu.
  • Screen is bowed or warped.
  • TV shuts off after powering on. Power light will blink. TV may also make a chirping noise.
Here are some photos of convergence problems.



Here is a quick test....

Using your original remote go-to the settings menu then goto the convergence section.

Try to adjust the red and then the blue convergence.

You should be able to move RED and BLUE in all directions - up, down, left, and right. And you should be able to get the grid straight.

If you can't move them in all directions or cant move them far enough your convergence chips are bad and should be replaced. This is a common problem.

Note: If you TV has as flash focus or magic focus button only try pressing the button. If it fails to fix the convergence your need to fix it. See below for a fix


You will need to replace the convergence chips and possibly some convergence resistors and pico fuses.
This is a a fairly easy DIY job if you are handy and can follow directions. You can get complete repair kits from or click here. They have put together DIY repair kits that include the OEM parts and step by step photo instructions for each repair. If you are not handy or can't follow directions we would suggest calling a shop.

May 15, 2010 | Toshiba 43H70 43" Rear Projection...

1 Answer

Convergence problems on right side of toshiba 43h70 43

Hello, its very possible there are other color alignments thats out of ajustements and certain color lines will affect each range of alignment and
you will need a tech to come out and check the control unit on your set.

Jan 23, 2009 | Toshiba 43H70 43" Rear Projection...

1 Answer


Replace both STK392-110 convergence IC's with Toshiba or Sanyo cheap junk IC's !!!.................T.

Aug 16, 2008 | Toshiba 43H71 43" Rear Projection...

1 Answer

Convergence has to be set daily

convergence amp ic are going replace them before you have more problems

Dec 12, 2007 | Toshiba 43H70 43" Rear Projection...

1 Answer

43h70 theatherview hd ser 53704921

Convergence amp ic bad
Sony Convergence

Nov 02, 2007 | Toshiba 43H70 43" Rear Projection...

4 Answers


Hello Renee, You have a convergence problem, but you are adjusting the wrong system. You need to adjust the convergence rings first ok You need a dot and crosshatch generator to properly set convergence for this set. Connect the generator set the TV to channel 3 and turn on the generator set it to dots adjusting the convergence try to get the center dot RGB all together and then adjust for the outer edges using the convergence board. the use the crosshatch to adjust convergence along the lines of the crosshatch pattern. Remember use the rings first and the the convergence board adjustments.

Sep 24, 2007 | Toshiba 43H70 43" Rear Projection...

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43H70 Blue Convergence out of line and will not line back up

If the blue colors will not line up, and the blue appears to sag inward from one or more sides, then you can bet that one of your convergence IC's has either cracked loose or burned out. The IC should be resoldered or replaced and the convergence realigned by someone experienced with projection TV convergence circuits.

May 21, 2007 | Toshiba 43H70 43" Rear Projection...

1 Answer

Toshiba 43H70 convergence

You will have to contact toshiba at 1-800-457-7777 and get a service manual to adjust the on board menu and adjustment.. I do not or ever ever recomend that an unexperienced person mess with the sets alighnments unless they have the service manual and understand all of the teminology as I've seen several sets that cost the customer 4 times what it would have if they didnt mess with the service menu and knock all the alighnments as this is not the time to adjust someting just to see what happens.

Apr 08, 2006 | Toshiba 43H70 43" Rear Projection...

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