Question about Toshiba 50H82 50" Rear Projection Television

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Toshiba 50H82 convergence problem

I have a Toshiba 50H82 with what I believe is a convergence problem specifically with red. While using the "Touch Focus" I notice that all the colors seem to move except the red. It moves vertically but not horizontally and then results in a "Touch Focus Error" message. The picture looks as if the red convergence is off horizontally by a few inches. I have a friend who is an electrician and willing to help with the repairs. I noticed that in a previous post from March of 2008 that you sent another person the service manual. Is there any way that you could send the service manual to me also? And does it seem like the red convergence is the problem?

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  • spyke1017 Oct 13, 2008

    Thank you so much for the quick response. So what you're telling me is that the resistors may not even need replacing...only the convergence amps?

  • spyke1017 Oct 14, 2008

    Thank you so much for all the help...I just have 2 more questions. What is "service mode"? And how do I access it?



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You might try setting in manual convergence and see if you get the same results. If so, YES, I would say that you possibly have to replace the convergence amps Q751 and Q752... That unit takes two stk392-110 Sanyo amps. When you buy them don't get knock-offs for some cheap price or you'll do the job twice. Order from someone like ACME in Florida. You can up the amp rating to 150's or 180's if 110's aren't available - but 110's will work just fine... Check your return resistors out in front of the amps also for any deviation in value.
You might also check for the presence of your -32v at Q783 and if missing replace it also - but from what symptoms you're describing it may only be the convergence amps..
Be glad to send you the manual, just email me personally and give me enough info as to what you need - I get nearly 3000 emails a day so "send me the manual" will not be enough to jog this old man's memory..
Good Luck!

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Posted on Oct 13, 2008

  • William Rayburn
    William Rayburn Oct 13, 2008

    Yes, convergence amps most likely - resistors posibly.. But check them with a dmm as long as you're right there..


  • William Rayburn
    William Rayburn Oct 14, 2008

    Service mode is a secret little menu that technicians can access to change certain parameters of the Tv like vertical linearity or height, shift the balance or tune the horizontal.. Not something you want to experiment with unless you have a REAL GOOD understanding of what's there and how changing a parameter can effect the control... In fact, some units give you NO tolerance and shifting one of the parameters can cause the unit to be dead beyond cost effective repair...

    Entering the service mode on that unit is covered in the service manual but I HIGHLY recommend not fussing with it...




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Related Questions:

1 Answer

Red convergence is out on the TV. Use the touch

This is a very common failure on Projection sets. Its called a convergence problem.

You may have one or more of the following symptoms.
  • 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.
  • No Audio / No Video - Makes Chirping Sounds

You can see some examples and find a fix here...

Sep 25, 2009 | Toshiba 50H82 50" Rear Projection...

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50H82 red wavy convergence (stks didn't fix)

If the tin can module you are referring to is the hyper module, it is common to replace all 11 caps because the factory caps ****. Check for bridged solder connections at STK's search the forum at electromaniacs for 50h81 :)

Sep 15, 2009 | Toshiba 57H82 57" Rear Projection...

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3 d images on toshiba 50hd82

This is a convergence issue, the stk392 ic's have failed on the convergence board, if you want to tackle this issue your self you will need soldering skills and a dvm. This is a common issue with all projection tv's.

Sep 01, 2009 | Toshiba 50H82 50" Rear Projection...

1 Answer

The red covrgence is all the way to left and wont move all other adjust ok

First thing to check are the convergence chips, as these are the most likely point of failure. They are typically STK392-XXX part numbers, and are readily available. the second possibility (far less likely) is a fault in the digital convergence module, specifically the circuit controlling red. if the convergence chip(s) are bad, it is also likely that the fusible resistor between the chip output and the convergence yoke will be open, make sure to replace that with a suitable replacement.

Jul 13, 2009 | Toshiba 50H82 50" Rear Projection...

1 Answer

Toshiba 50h82 convergence issue

Projection TV sets have several common problems listed below.

Problem #1) Convergence


  • Screen Looks 3-D
  • Colors wont align
  • Screen may look distorted
  • No Audio/Video - makes a chirping sound.
Example Photo:
Problem #2 CRT Fluid has clouded over.


  • Dull Video, Washed out
  • White/Bright looking video
  • Halos around objects
  • Red/Orange looking
Example Photo:

You can see more examples and find a fix here...


Dec 11, 2008 | Toshiba 50H82 50" Rear Projection...

1 Answer

Convergence for toshiba 50h82

Either mode is fine...just save your session when done!

Projection sets have two very common problems.

The first common problem is convergence

These sets need to have all three colors - RED - BLUE - GREEN - lined up correctly on the screen in order for the picture to look normal. This is called convergence.

When its out of alignment the video will look 3-D, wavy, distorted, etc. Most of the time you just need to adjust your convergence in the menu. If you cannot adjust it in the menu - then your convergence is broken and needs to be repaired. Convergence problems are very common on all Projection TV sets including Sony, Samsung,JVC,Philip Magnavox,Panasonic,Akai,Pioneer, Hitachi,Mitsubishi,Zenith and others.
You can get more information and a DIY convergenece repair kit with instructions from the link below.

Here are some of the most common problems with these sets...

*Screen Looks 3-D
*Colors wont align
*Screen may look distorted or warped
*No Audio/Video - TV Shuts down - May also make a constant chirping sound

Problem #2 - Another common problem is dull or washed out video.

Your set may have one or more of the following symptoms....

*Dull looking picture
*White looking picture
*Halos around objects
*Red/Orange looking picture

bb0cf99.pngYou can see some more examples and find a fix using this link on Fixya

Nov 16, 2008 | Toshiba 50H82 50" Rear Projection...

1 Answer

Convergence problem

my convergence are having a problem the blue color won't moved

Oct 03, 2008 | Toshiba 50H82 50" Rear Projection...

1 Answer

Convvergence problem w/ Toshiba 50H82

You need to replace following ICs, may be 2 pieces in your tv for convergence problem.
IC, STK392-110T

Toshiba Part Number: 23135090X
Please search on net for availability in part stores

Sep 27, 2008 | Toshiba 50H82 50" Rear Projection...

1 Answer

Touch Screen Error

RED GUN OK, you need convergence IC's replaced = Toshiba
part # STK392-110T.....................................T.

Nov 14, 2007 | Toshiba 50H82 50" Rear Projection...

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