Question about Toshiba TN50X81 50" Rear Projection Television

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Convergence Issue on Toshiba TN50X81 - Service Manual & Parts Source?

Hello Ginko,
I have a Toshiba Projection TV that I purchased new in December 1999. Last week the "Red" convergence went out of wack, and when I checked in the manual today for how to address, I found that I was unable to do make any corrections.

I am a Service Manager for a Industrial Packaging Distributor, and I feel confident that I can make the necessary repairs if I can identify the convergence board and the IC's that may need replaced.

I would welcome any information and coaching you may suggest, so I can consider making this repair.

The TV has been sitting in the same location for about 8 years, so no recent moves or banging around.

When we contacted a local Toshiba Service center, they notified my wife that the repair cost would be about $400+ to replace or repair the convergence board.

I tried to adjust the red convergence using the TV controls, but I was unable to do so.

Thanks in advance for you help...or solutions for further testing.

Mark C.
four4iowa@sbcglobal.net

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  • Anonymous Mar 01, 2009

    I purchased a 50 inch Toshiba in December of 1999 and recently the convergence is out of whack and can not be fixed with the remote. The red is up in the air on the convergence menu. The lower half of the tv shows red and blue rainbows when you are watching it. No problems for years. This came out of nowhere, and I have to fix it somehow because I am poor and it seems too good to dispose of.

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Replace the convergence IC's - P/N STK192-110 with part STK192-150 or 180. Then you can go back in and make the detailed convergence settings and get your picture back in alignement. Also check the flame-resistant resistors around the ICs to make sure that none of them have opened up.

Posted on Jan 19, 2009

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Toshiba TN50X81 50 TV


More likely is the set is in shutdown---most common issue on this type of set is the convergence---to know you would have to locate and unsolder both 18 pin convergence chips---with them out of the circuit if the set comes on (will not look good) one of the two chips is shorted--these sets have very good protection circuits to prevent many parts from being destroyed at one time..
5_26_2012_3_32_10_pm.jpg

These are the chips--STK number is right on the front.

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If your TV looks 3D, warped, or distorted it likely has a convergenge problem.
If however it just looks dull, washed out, redish, greenish, or blueish or if it looks like objects on the screen have halos the fluid in the lens has soured.
You can search google for parts or you can get the parts with repair instructions from sites such as www.TvRepairKits.com

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i have seen before that model have pretty severe cracked solder connections on the power board. otherwise those types of tvs can have convergence failures that will keep the tv from turning on.

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What was the STKs that was in set ? If 110s always upgrade to STK392-180s. If they were 392-560s go back with the same. they worked differently then the 110s 150s 180s

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We had this problem too. If finally got to where it wouldnt turn on at all. A service man came out and replaced the power switch. That took care of the problem.

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