Question about Toshiba 55H70 55" Rear Projection Television
NOTE: ----DO NOT TOUCH THE CONVERGENCE BOARD " -------
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
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
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
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Posted on Jan 02, 2017
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 http://www.ptscorp.com, 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
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
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
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