Question about Toshiba 36A50 36" TV

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No vertical output

There is only a thin line across the screen, could use a schematic of chassis and possible causes tu

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  • willmonette Aug 08, 2008

    I have a Toshiba 36A50 TV that is about 6-7 years old. The picture only has a bright 1/4" line with color and sound. The back ground is black. About 2 months ago I removed the back off and carefully used a air nozzle to blow off the heavy dust. The TV worked great until a couple of days ago. I tried unpluging for 15 minutes no change. What part could be needding replacing.

  • Anonymous Oct 25, 2008

    I have the same issue. I can pull the TV out , but it will be extremley difficult seeing as though the TV is large and heavy. Before I do this do anyone have any other suggestins on what this might be before I open this up?

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My Toshiba 36A50 had the same issue. The picture would gradually shrink until it no longer appeared and there was only a thin line running from left-to-right across the center of the screen. The volume still worked perfect.

From information I gleaned from this site and others, I removed the main circuit board and flipped it over to re-solder the pins going to the Vertical IC (TA8427K). This IC is right about center of the board mounted on an aluminum heatsink so it is soldered in vertically. You can easily see the part number on the IC and it is the only one of that part number. Additionally, the silk-screen on the PC board has a QC301 next to it identifying the part.

After I re-soldered it, the TV works excellent. I just did this yesterday afternoon 10.26.08.

Thinks to note that have been pointed out by others:

  1. There is high voltage in the TV even after the power is removed. There are several sites where they tell you how to remove the power.
  2. Make a note of all connections. Most of the connectors are keyed to go in only one way but some you can turn the connector either way. Write down all the information and take some digital pictures before you disconnect everything.
  3. As was pointed out but other people, the Vertical IC and/or some of the surrounding capacitors may be defective and need replacement. Its possible that your local Radio Shack may have what you need but I would not count on it. A possible source for parts is www.digikey.com.

Posted on Oct 27, 2008

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Had same problem reheated solder joints around Vertical IC problem fixed

Posted on May 06, 2009

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Dear friend for what you are saying you have some loose connection on the main board,you need to get a bright light a soldering iron and some solder wire and re-do the connection that look loose.
wish you luck


caypianan@yahoo.com

Posted on Sep 30, 2008

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