Question about Toshiba 50A62 50" Rear Projection Television

2 Answers

Toshiba rear projection TV model 51vw9ua appears to have convergence problem. Both Convergence chips (STK392 110) have been replaced. However the picture is jaggered (horizontally). With the convergence test signal "cross" the horizontal line is is fine, however the vertical line is wavy. When the TV is turned ON the screen appears to have a horizontal alignment problem, after about 5 to 8 minutes the picture clears up but still appears horizontally misaligned. Any suggestion to resolve this issue? Is this a common problem?

Posted by Anonymous on

  • Anonymous Jun 23, 2011

    Thank you for your advise. In terms of kits tvrepairworld.com was useful, it suggested replacing the convergence chips and 6 x 1.8 ohm metal film resistors (2 watts). I had already replaced the chips, replacing the 6 resistors hasn't improved my earlier problem.

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2 Answers

Chi Chu

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  • Toshiba Master
  • 8,457 Answers

Ur tv convergence board still have more dead components like some resistors.Tries websites like Tvrepairworld.com,Tvrepairkits.com to check out their whole convergence kit parts they put to gether for ur Toshiba tv model what of those resistors need to be replaced too.

Posted on Jun 22, 2011

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ladywinn

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  • Toshiba Master
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Check the 1.8 ohm resistors,located in front of ICs. Try replacing all 3 of them.

Posted on Jun 22, 2011

  • Anonymous Jun 23, 2011

    Thanks for the tip, replaced 6 x 1.8 ohm resistors ( I am guessing 3 for each convergence chip ). The local electronic shop didn't have any metal film resistors, so have used carbon resistors.

  • ladywinn
    ladywinn Jun 23, 2011

    Use 1 watt resistors only and you need to know How To Enter Service Menu to realine Convergence.Service Menu is for Techicians Only Be very carefull when making adjustments
    ortherwise settings will be wrong and convergences will not be correct.

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Projection TV tubes have a liquid coolant that is used to keep them from overheating. After many years the coolant in the blue and green tubes will become cloudy and cause the screen to look dull, red/orange, etc. You may even see halos around images.

Picture of a set that needs the fluid changed.

578ba6c.jpg
TV set after fluid change

65af323.jpg

2c07611.pngSolution #2


What you will need to do is replace the coolant and clean the crt. You can get a repair kit from www.TvRepairKits.com that includes replacement coolant, photos. instructions, etc

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Here is a quick test....

Using your original remote go-to the tv settings then goto the convergence section.

Try to adjust the red and then the blue convergence.

You should be able to move them up, down, left, and right.

If you can't move them in all directions your convergence chips are bad and should be replaced. This is a common problem.

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Such as: Red moves up,down, but left or right fails. 

2) Screen is bowed looking.

If you have one or more of the problems above you need to replace the convergence chips. You can get a kit and instructions from www.TvRepairKits.com  

Hope this helps :) 

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Problem #1: Convergence Chip Failure ( common problem )

Here are some of the most common symptoms and example photos of a convergence problem
  • 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.
701cb04.jpg
77ea520.jpg
f0900cb.jpg
Here is a quick test....

Using your original remote go-to the tv settings then goto the convergence section.

Try to adjust the red and then the blue convergence.



You should be able to move them up, down, left, and right.

If you can't move them in all directions your convergence chips are bad and should be replaced. This is a common problem.

2c07611.pngSolution #1

You need to replace the convergence chips and convergence resistors. Check the site www.TvRepairKits.com. They have put together a kits for most models. If you don't see a kit for your set send them a quick note and they will put one together for you. Their kits include a photo instruction guide, original OEM Sanyo STK chips, convergence resistors, pico fuses, etc.


Problem #2 CRT Fluid is Cloudy

Projection TV tubes have a liquid coolant that is used to keep them from overheating. After many years the coolant in the blue and green tubes will become cloudy and cause the screen to look dull, red/orange, etc. You may even see halos around images.

Picture of a set that needs the fluid changed.

578ba6c.jpg
TV set after fluid change

65af323.jpg

2c07611.pngSolution #2


What you will need to do is replace the coolant and clean the crt. You can get a repair kit from www.TvRepairKits.com that includes replacement coolant, photos. instructions, etc.

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http://www.casiasfamily.com/repairlog/tp50h15.html

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