Question about Toshiba 42H81 42" Rear Projection Television

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The touch focus

The red will no longer align but mainly on the left side of the screen.

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Will the red align in all 4 directions in the other areas of the screen? If it moves in all 4 directions everywhere but one section its probaly a resistor near your convergence amplifiers. If the red wont move in all 4 directions anywhere, then its your Convergence amp ICs faulty. Cost about 20.00. Hope this helps.

Posted on Jan 13, 2008

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Posted on Jan 02, 2017

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1 Answer

51F59A red screen all the time


1. entire grill below front screen must come off (usually held in place by screws in back on either side.)

2. locate and remove inspection plate dead center behind it.

3. Locate small black plastic block with 6 black controls built in; three (look carefully) left to right are focus--DO NOT TOUCH THOSE.

The other three are Screens and will be marked with tiny letters r g b (red, green, blue) and green is always middle.

Locate the red screen (not FOCUS).

With set on adjust red down just slightly(usually less than 1/8 turn.

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1 Answer

Magic focus --blue and yellow sag in the upper left area of the screen


This is a problem with the convergence circuit. If you can solder, you can repair this yourself. First try and resolder the pins on the existing convergence ICs. These are large black ICs attached to a heatsink and should be marked STKxxx. If the resoldering does not resolve the problem, replace the ICs.
Dan

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1 Answer

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sounds like to me that you need to replace the convergence IC's.

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1 Answer

Screen Is Blurred


Did you try hitting the small button on the front of the tv labled flash focus? Try pushing this button because this model only features auto focus for aligning the red/green/blue projectors.

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1 Answer

Convergence -manual


Replace the convergence amps and test and replace any or all of the 2.2ohm resistors in the yoke return path out in front of the amps. This unit takes two STK392-110 Sanyo originals, DO NOT GET CHINESE KNOCK-OFFS... Buy them from Acme sales out of Florida and you can be assured they're originals.
Bill

William Rayburn, CET
Premium Technologies
PO Box 442
Long Beach, WA. 98631
360-642-4993

Oct 11, 2008 | Toshiba 42H81 42" Rear Projection...

1 Answer

Red is out of convergence


You can repair it yourself by replacing both STK392-110 Convergence ICs. You can get replacement ICs at the following link with free instalation instructions . Heres the link.
http://servicemanuals.vstore.ca/

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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

LG rear projection colours out of alignment


This is all i could find when i did a search:
they have inherent problems with the glycol oil used to cool the tube leaking past the bladders & onto the boards.... & it's conductive :p

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1 Answer

Convergence


One of your convergence IC's has burned out and needs to be replaced. A good rule here is to go ahead and replace both STK392-110 IC's with the new improved STK392-150's. If you have never replaced convergence IC's and realigned convergence circuits, allow a qualified tech to handle it for you.

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