Question about Samsung TXR3079 TV

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Picture dies after 30 min

Replay after turn off for 5 min.

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Marikamp:

I had the same problem with my Samsung TV Model: TXR3079WHX. I troubleshot my problem with a can of component cooler from Radio Shack and found my problem to be a defective voltage regulator, identified as "QR015" on the main circuit board (the same board that contains the high voltage section).

Caution:

Before I proceed any further I need to strongly warn you. Do not attempt to remove the back cover, troubleshoot, repair or perform the actions that I have done, if you are not a "qualified service technician". Removing the back cover exposes you (and anyone else) to harmful and deadly electric shock, even though the TV may be unplugged from the wall outlet and turned off. You (or anyone else) can be seriously injured or even killed. If you are not qualified, play it safe by allowing others who are qualified repair this for you.

The defective part (overheats and shuts your TV off) is voltage regulator manufactured by Fairchild. The part number is KA75450ZTA. This part is available from Mouser Electronics for less than 20 cents plus shipping. In order to replace this part a qualified technician will need to remove certain cables and unscrew the main board to allow access to desolder and solder the new component.

Hope this helps.

Posted on Jun 06, 2009

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That is the power supply defective or the main board is overheating.

The technician will start the Set with cover open and point a fan as big as possible toward the main board, if the TV stays on longer or does not turn off at all then it was an overheating problem on main board. Replace cooling system, or even better add an additional cooling fan to the heath sink.

If this was not overheating test inverter and power board.

Note this model suffers from overheating related problems, but as you pointed out, a faulty power board, or a faulty inverter board can cause the same kind of shutdown.


Posted on Apr 16, 2009

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