Question about Toshiba TN61X81 61" Rear Projection Television

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Convergence Circuitry Physical Location

Where is the convergence circuitry located exactly in the rear of the TN61x81?

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Pitcher has shadows and sag from tom and rises the bottom. If tapped clears up for a bit but always comes back.

Posted on Dec 09, 2009

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If you are at the back of the tv you need to open the lower cover, it is on the Left of the deflection board(flyback transformer) and above the power supply board where the power AC cord attach..

good luck...

Posted on Sep 15, 2009

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Hello look at circuit boards it is the area with a large metal looking heat sink with fins with large black IC's mounted on one side of the heat sink . These are your convergence IC amplifiers you can't miss them as they are the largest intergrated circuits in the television.

Hope thi shelps
Plaeas leave comment for futher info..
Thx Lavell

Posted on Oct 02, 2009

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Chk out my new post today.

Charlie M.

Posted on Nov 16, 2008

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1 Answer

Picture movement and lines

What you most likely have is a convergence problem. The convergence circuitry is used to align your colors. What you describe sounds like that circuit has failed. Google “Hitachi convergence repair” and you’ll find many sites that will educate you on how to repair and where to get the parts needed for your Hitachi PTV.

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HDTV Model # HCN473WX/XAC picture projected as several overlapping, different colored images

It looks like your TV has developed a failure due to a hardware malfunction. The hardware that failed are mark STK392-040 and will need to be replace to restore the proper functionality of your TV.
Do you have any experience with hand tools such as soldering iron and or using a multimeter?
If you do, this repair can be a DIY; keeping in mind that you will have to disconnect the TV from the AC power before start working around the circuitry. I would suggest to leave unplug for about a day just to let the capacitors discharge the energy store in them.

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Letters on the screen are out of focus

could be adjust ment required on the focus block a part of the high voltage circuitry.. ususlly located..if you take of front grill, than remove a small panel..has 3-6 small knobs on it. Bottom three usuallt focus, one for each of the three lamps. or could be convergence misaligned..maybe time for a convergence repair. Two large black STK chips on main board.

Trace Electronics Repair, Barrie, ON

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1 Answer

My JVC AV-56WP74 is showing green and purple waves at the top of the screen what is defective?

Common problems with the chassis used in this model for complaints such as this are caused by damage in the convergence circuitry (since there are three separate picture tubes, each mounted in a physical location different from the others, the light each tube "throws" on the screen falls in a different physical location on the screen; the electronics of the convergence circutry force the red & blue light information to "converge" on the image produced by the green tube, which being physically located in the center of the other two is the "master" image), usually associated with the IC's used as amplifiers for the convergence circuits (this model uses STK392-110's) and with the high-wattage, low ohmage resistors used as biasing components for these amps

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1 Answer

It has a convergence issue how do i fix it

Did this problem just occur, or does it come and go?
If it just happened and it's continually doing it, it's most likely in the convergence circuitry. Most of the repairs on PTV are changing out modules. Problem occurs, what module exactly is involved, convergence usually has convergence output, pincussion, convergence drive and power supply. Which one? Without proper internal troubleshooting, hard to guess.
If the problem comes and goes, it's probably bad solder connections, PTV's are notorious for bad solder connections. When all the TV manufacturers removed silver from their soldering, using only tin and lead, lots of problems occurred since.

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1 Answer

Toshiba TN61x81-- after convergence IC's replced

Please don't be offended by my suggestions if you are experienced at circuit repair.
You may have a cold solder joint or bridged joint. Check and re-check your connectors for placement. It is normal to have to adjust the convergence and focus after replacing the IC's. There should be a row of focus knobs (ususally covered by a piece of black tape) with the screen controls.
The convergence IC's won't affect the visibility of a color only the alignment.

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2 Answers

Convergence problem

If the convergence is out on that set you most likely do not need to make an adjustment the circuit will need to be repaired. There is a stk on the convergence amp board that needs to be replaced. A good tv shop will run you somewhere between $300-$500 to do the repair

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1 Answer

Toshiba TN61X81 Convergence

Need to know generic number of convergence output IC's.STK392-100,or what,Please

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1 Answer

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Convergence outputs reliable.Suspect power supply to control convergence bad.Small PCB mounted above two main PCB.Check STK730-010 & associated circuitry. If This info not helpful, please provide complete service # and chassis number.

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1 Answer

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