Question about Toshiba 55H70 55" Rear Projection Television

3 Answers

Convergence problem Yesterday morning I turned on my TV (Toshiba 55H70) and noticed that there was red and blue "shadowing" throughout the entire picture. It is more severe around the edges of the screen. According to the research that I have done so far, I believe it is a convergence problem. I have already tried to adjust the convergence to no avail. When I go to the convergence controls by using the menu on the TV, the red "+" symbol on the screen will only move up and down (not left or right). Also, the red "+" is slightly tilted so even if it could move from left to right, I would not be able get it to get it to properly align with the green "+". Is there another way to alter the convergence. If so, how? Any advice or solutions would be greatly appreciated.

Posted by on

3 Answers

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 5 achievements.


    An expert who has written 20 answers of more than 400 characters.


    An expert who has answered 20 questions.

  • Expert
  • 55 Answers
Re: convergence problem

1. Bring Up 1 Projector Light 2. Bring Your Color Convergence + Sign and Should Be Center In Your TV 3. If Not Adjust Center with The 2 Tabs Just Above That Projector Tube You Have Lighted 1 Tab Will Move + Sign Horizontal Then Roll The Other Vertical Then Roll..U Will See--" 4. Once Your + Sign Is Center Turn Up Your 2 Other Projectors Make Sure They Are Able To Adjust Across The + Sign You used 1st Make Sure the 2 Other + Signs Move Left And Right And Up And Below The Vertical and Horizontal Lines. If Not Adjust There Tab to Make This Possible. 5. Using Your REMOTE Converge The + Signs Together. ---------------- IF YOU MESSED WITH THE CONVERGENCE BOARD ------------------- 6. Now Lower The 2 Lights So Your 1st Projector Is Lighted 7. Bring Up A Menue On Your TV -- Look At It ...Are The Lettering Center and Square ..?? 8. If They are Lower That Projector and Light Your Projectors 1 At A Time To Verify Letters are Center and Square. ---------------If You Have To Adjust The Menue To Bring Center And Square -------- 9.Looking At The Convergence Board You Will See 3 Rows Of Adjustment Dials Each Row Is For 1 Projector. ---TAKE NOTE TURN THE ADJUSTMENT Slowly--- 10. Locate The Row that will adjust The Projector You Have LITGHTED".... 11. Label On A Paper What Each Knob Will Do To The Screen Very Help-Full 12.Adjust Your Letters Dead Center and Square then Lower That Projector Light And Bring Each Projector Lighted At 1 Time To Verify Menue Is Center And Square. 13.Leave On Your 3rd Projector and Bring Up Your Light On The 1st Projector 14. Adjust the Letters Of Your 1st Projector Over The Letter Of Your 3rd Projector 15. Switch To Your Convergence + Sign To Help --Turn Knobs Slowly --- 16. Make Your Letters Merge Together And Your Lines Square. 17. I Use The Top Letters and Lower Letters And Keep The box Square 18. Hey If Your Projector Colors When Looking Through The Rear Of The TV Are Not Equal With Take And loosen The Wing Nuts And Turn The Lens To Focus the Color and Make Narrow Or Wide....All 3 - Equal DO NOT GET UPSET THIS WILL TAKE TIME MAYBE ALL DAY SO RELAX HAVE FUN" Do Not go Sticking Your Hand Into The TV While TV Is Plugged into The Wall" ---

Posted on Dec 26, 2009

  • Level 1:

    An expert who has achieved level 1.


    An expert that has over 10 points.


    An expert whose answer got voted for 2 times.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 9 Answers
Re: convergence problem

I had a problem with my TV colors not lining up. One day I turned it on and the green was out of wack. I checked this message board and replaced the STK chips, bad soldering and all led to me just giving up on that and buying a whole new Convergence Board ($185). I replaced the missing silver box on the new board and I just plugged this in and though now my Green lines up okay, my red is out of whack. Is there something I am doing wrong? Can anyone help me? Did i miss a step? Frustrated......Bruce

Posted on Aug 18, 2007

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 5 achievements.


    An expert whose answer got voted for 20 times.


    An expert who has written 20 answers of more than 400 characters.

  • Expert
  • 124 Answers
Re: convergence problem

We need a better description of what you mean by shadowing. However I am assuming: 1. You mean it ''bleeds'' off to the right when you have something with a hard red/blue drive. 2. When you turn the contrast and color down a bit it gets better. unfortunatly I cannot tell you how to fix convergence, but I can think of some other possibilities. In this case the red/blue emmision of the crt is dying off and going into saturation when driven hard. To fix, replace with a new picture tube/crt. In some cases you can get a little more life out of that tube (with a watchable picture) by having the screen, focus, cathode bias, and drives slightly readjusted. It will take someone with experience in doing these adjustments on a weak tube to get it looking as good as possible. Given the construction of the cathodes (guns) in that crt, only a very low level crt reactivate should be tried on it. The hard rejuv most crt testers give is highly likley to completely destroy the cathode on that crt.

Posted on Mar 27, 2006

3 Suggested Answers

  • 3130 Answers

SOURCE: Blue will not Converge

This is the typical convergence problem. There are two IC's that need to be replaced. They are soldered into the printed circuit board. If you have no soldering skills, and are in the US, you can take the model number and go to, as they will rebuild or sell you a refurbished board . There is a phone number listed at the site if you need help getting the pricing. Good Luck

Posted on Mar 29, 2007

  • 398 Answers

SOURCE: Toshiba 56H80 Convergence Problem?

There are 2 large IC's in your set and one of them has burned out. These are called convergence output IC's and are usually the STK392-010's. A good idea would be to go ahead and replace both with the newer, upgraded STK392-150 IC's. A good tech can change those IC's in about an hour and a half, and when I do a housecall for a set like that I charge $150, but shops in your area will vary so be sure to ask around.

Posted on Sep 10, 2007

  • 1694 Answers

SOURCE: Toshiba 42H82 convergence problem

Replace STK convergence IC's w/OEM or better parts.Senior tech soldering ability needed. Ex==Steel jumper wires feeding b+ to conv. IC's need resolder to prevent call-back.Also, best re-alignment done in service mode==consult service literature.

Posted on Sep 29, 2007

Add Your Answer

0 characters

Uploading: 0%


Complete. Click "Add" to insert your video. Add


3 Points

Related Questions:

1 Answer

What causes the yellow and blue ghost on tv, and how to solve it. It is on a Toshiba rear projection

The problems ur tv have is known as a convergence problems,it dead.The tv colors lines R,G,B mis alignment,have colors shadows pictures or 3D pictures look like.The tv convergence board have dead 2 STK convergence ICS and some or all it resistors are dead.These parts on the tv convergence board,must be replaced these parts on the tv convergence board to solved the tv picture convergence problems.The shop,will cost u $300-350 for parts and labors.

Oct 25, 2010 | Toshiba 55H70 55" 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

Colors shadowing eachother, adj convergence, but will not save.

Sounds like your convergence IC chips have failed. You can buy the parts from various suppliers or you can just get a complete repair kit from

Mar 15, 2009 | Philips 46PP9302 46" Rear Projection...

1 Answer

Red/Blue line overlay..........

replace convergence chips and limiting resistors

Aug 29, 2008 | Toshiba 55H70 55" Rear Projection...

1 Answer

Red double picture with green and blue

convergence problem there are 2 integrated circuits inside the set needs to be replaced

Aug 25, 2008 | Toshiba TZ50V51 50" Rear Projection...

1 Answer

Toshiba 55h70

sounds like the convergence ICs are defective and need to be replaced, they are STK392-110 you can get replacement ICs at the following link that include free instalation instructions.

Jun 06, 2008 | Toshiba 55H70 55" Rear Projection...

1 Answer

Convergence fuse Toshiba rear projection tv

Wire jumpers need re-soldering....Locations 008,010,017 etc
on inside edge of signal board near convergence IC's.....research
my Toshiba " H " Model rear projection " blows fuses" solutions.

Jan 27, 2008 | Toshiba 55H70 55" Rear Projection...

1 Answer

Blue line shadows

sounds like convergence amp ic's

Jan 03, 2008 | Toshiba 55H70 55" Rear Projection...

1 Answer

Can not align color dirvertions on test screen

I think you need a remote to use the convergence features of this set. Does it have an auto convergence feature? And does it work?

Dec 31, 2007 | Toshiba 55H70 55" Rear Projection...

Not finding what you are looking for?
Toshiba 55H70 55" Rear Projection Television Logo

1,277 people viewed this question

Ask a Question

Usually answered in minutes!

Top Toshiba Projection Televisions Experts

Jaime Hernandez

Level 3 Expert

2267 Answers

Dave Naylor
Dave Naylor

Level 3 Expert

834 Answers

The Knight
The Knight

Level 3 Expert

66330 Answers

Are you a Toshiba Projection Television Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides