Question about Toshiba 50H81 50" Rear Projection Television

3 Answers

Green Convergence I have a toshiba 50H81, 2001 model. My problem I am having is with the vertical green line in the touch focus, the line is pretty warped and the horizontal is just fine, and the other colors are fine vertically and horizontally. How do I determine which board to pull out to check to repair or replace. I have minimal back ground in electronics, and I know my limitations. If it starts getting to technical I will pay a tech to fix it, but I would like to give it a try first.

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  • Scubaguy Apr 01, 2008

    Mrniceguy, thanks for your response. If you could walk me thru this procedure as I post questions I would really appreciate it. I am guessing the 2 large heatsinks are the ones in the center of the picture I am posting marked with a black X, and they are on the right board (green) on the left side of it. And the IC's are the black pieces screwed to the back side of them. I just want to be sure I am disassembling the right part. Thanks.

  • Scubaguy Apr 02, 2008

    Thanks mrniceguy, I got the board out with not to much problem, and I ordered the CI's and some tools to complete the project, I'll be intouch when they arrive in 2-5 days they tell me.I'm a little nervous on how close the CI solder points are to each other, I will need a magnifier, my eyes aren't what they used to be. :)

  • Scubaguy Apr 10, 2008

    Hey mrniceguy, I recieved my order last night of parts and tools, and today I have desoldered the heatsinks while leaving the IC's in place, then replaced the IC’s and added new heat grease. I checked for bad resistors, they look good, nothing else on the board looks bad. The heat sink and IC combo are soldered back in place, except I will finish the IC soldering to the board part tomorrow and then I'll let you know if it was a success or a reeducation in basic soldering skills.

  • Scubaguy Apr 11, 2008

    Hi mrniceguy, well no luck today. I got the board installed and all the plugs connected and I just get a blank screen, even though the power light comes on, thats the only thing that does. I could probably pull it back out and look for more stuff to fix but like I said before I know my limits and I have reached it. Thanks for your help.

  • Scubaguy Apr 12, 2008

    WOOOOHOOOO !! Thanks guest for the recomendation to recheck the conections, there was a loose one. If I can squeeze 1-2 more years out of this television, I'll be real happy, and thanks to mrniceguy for his expertise in diagnostics. Scubaguy has left the building!!



3 Answers

Make sure that you check all cables to ensure they are in the rigth connectors and see if you might have forgotten one and something is disconnected.

Posted on Apr 11, 2008


Make sure you use solder wick it is the easiest for that job

Posted on Apr 04, 2008

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If you are looking at the tv from the back you will see 2 large heat sinks on the left board(signal board) these are the convergence output ICs one of those is bad and most likely you have at least one bad resistor near the faulty IC. the part numbers on the ICs will be STK392-110 i suggest replacing both and any bad resistors and see what you get also check for any bad solder joints there are 2 large blue coils that you can see from the top side check there joints for bad solder as well as any other components on the same line. otherwise call your tech

Posted on Mar 31, 2008

  • MATT BECKER Apr 01, 2008

    yes those are it. make sure that you mark any cables with a sharpie after you take them off of the board so you know where they go back. also be very careful with that board on the right it is double sided and if you crack it then you are pretty much out of luck. i usually de solder the AMPS and the heat sinks together and remove them as one.

  • MATT BECKER Apr 12, 2008

    good im glad that everything worked out. that was me on all those comments i had just forgotten to sign in after i clicked the link from my email.


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1 Answer

Image is out of focus and pulsating green lines around some image

yes it is repairable will not be cheap.a tech will have to do the convergence inside the tv,the remote only does so much.i have had 3 in the past and when they get older they become dull,i would not by rear projection any more years going back that was the only choose you had for a big screen ,now lcd and plasma have come down in price i would be looking at that if i was you.

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Trying to manually fix color convergence on Toshiba 57H81

The convergence ICs and the six 1.8 ohm 1watt resistors need to be replaced. You can get the convergence repair kit for your model at which has the Two Convergence ICs and the six resistors plus the CD with instructions on how to do the repair.

Dec 02, 2009 | Toshiba 57H81 57" Rear Projection...

2 Answers

Toshiba 57h81 green will not focus

Typically this is a convergence problem and can be repair relatively easy. Refer to this video to determine if you truly have a convergence problem. Also make sure you use your TV's original remote to make this adjustment.

Nov 15, 2008 | Toshiba 57H81 57" Rear Projection...

1 Answer

Pcture problem

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

Aug 04, 2008 | Toshiba 43H71 43" Rear Projection...

1 Answer

Toshiba 65H81 convergence issue

Does the blue and red crosses move at all ... eather vertically or horizontally. if they move at all then it may not be the chips.. could be a resistor. if the crosses dont move then it probally the ic. these chips run about 7 to 45 dollars apeace depending on type. at our shop we charge around 125 to put in.

Jan 15, 2008 | Toshiba 65H81 65" Rear Projection...

1 Answer

Will not 'Touch Focus' - Toshiba 42H83

1)I have yet to learn any advantage to replacing -110's with -150's
I think there is a misconception that increasing numbers =
better,more durable results....Actually, using OEM or better
quality should be most important.Generics from any source
tend to be seconds,thirds, junk ! Name brand are first quality
2)Check B+ feed resistors next to convergence IC's = burnt ?

3)Solder wire jumpers on signal board = 008,010,017,600,etc.
prevent maitenance

Dec 20, 2007 | Televison & Video

1 Answer

Still green

go In service convergence mode and try to adjust red and green if you cant then it's convergance amp ic's
if you can adjust them so they align up try doing a touch fous after that,.

Dec 16, 2007 | Toshiba 42H81 42" Rear Projection...

1 Answer


you have a convergence problem that will require the replacement of the convergence amp ics.

Nov 29, 2007 | Toshiba 51H83 51" Rear Projection...

1 Answer

Suspected Convergence Issue on Toshiba 51H83?

Needs chassis pull & convergence IC's replaced....then
Touch Focus will work again..................T.

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2 Answers

Toshiba 57h82

your convergence amp ic's./if you want to cheat/align the other two colors and manualy move the green yoke rings on the green picture tube neck so the green cross aligns with the red and blue.,they shuold form white when all three are aligned,on top of each other.

Sep 13, 2007 | Toshiba 57H82 57" Rear Projection...

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