Location of convergence chips in Toshiba 57H81.

I have a Toshiba 57H81. The picture is going bad - the blue tint in the picture is skewed to make it look 3D. Thanks to the help of answers from this site and my own research, I found out that the convergence chip(s) are going bad. Apparently my model has 2 STK392-110 IC's that need replaced. I got an estimate of $400 to fix my tv. However, I also found 2 STK392-180 IC's (recommended for higher wattage and less prone to failure) for a cost of $15. So idealy, I would like to fix the problem myself. However, I cannot find the bloody chips! Is there a site or manual I can find that will describe the location of these illusive chips? Or would someone actually be able to tell me?

1 Answer

shaun taylor

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Toshiba Master
1,527 Answers

Hello if you can use a soldering iron you shouldn't have any problems but you will need to test the resistor in front of the ic and the capacitors at either end of the ic ! the ic usually located to the right hand side of the tv behind the tuner board connected to metal frame called a heatsink 2 big black chip good luck

regards
shaun

Posted on Mar 27, 2010

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The picture is warped red & blues distorted

Your Convergence ICs have failed. It is very common on rear projections. The solution is to replace the STK chips, check fuses and the resistors next to the STK chips. Replace as necessary and re-align via the service menu. It is about a $300 repair at a tv service center. You will need the service manual if you decide to do this yourself.

Try This:
When you notice the symptons Use this simple test to verify.
Go to the users menu on the tv.
Look for the converge option probably under setup or video setting. Converge is short for convergence to align the red and blue colors to the green color.

If you cannot move the red either horizontal or vertical, then the STK chip has failed for red section.
If you cannot move the blue either horizontal or vertical, then the STK chip has failed for the blue section.

If you can move both in each direction then the problem is something else.

Note if one STK chip fails, you replace both regardless. They will be right next to each other.

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You need to replace convergence out chips in your Toshiba 57H81 tv by qualified tech because 3-D look picture in rear projection tv shows some thing wrong with convergence output chips.
Your tv model number shows it is rear projection tv that use 3 tubes to make color picture on front screen where as dlp tv use one lamp as back light source to present picture at front screen that is generated in light engine.

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Mar 25, 2010 • Toshiba 57H81 57" Rear Projection...

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It sounds like a convergence problem; in the customer menu there is a way to confirm----if red or blue are skewed and will not adjust in some area of the picture you need to replace both convergence chips--the model indicated uses two of the STK-392-110 chips.

Not the most easy set to do this repair on; involves getting at them and replacing both.

Total parts cost should be under 30 dollars on Ebay.

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Two things---first if you don't mind give me a vote here--I am rated on how many problems I fix

Second---with the original remote go into the customer menu and select Convergence---see if you can adjust the other problem that way---I can if that helps you email you the instructions for going to the tech menu to adjust convergence all over the screen and and saving those adjustments----if you find the convergence will NOT adjust in some area of the screen you may have a convergence problem.

I would appreciate a vote here for my help and if you need the directions for the advanced convergence let me have your email.

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Your TV most likely has one of two possible problems.

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.

Solution #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.

TV set after fluid change

Solution #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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Screen looks 3D
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Screen is bowed or warped.

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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