Question about Samsung TXR3079 TV

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Involuntary Picture Loss

The Samsung TX R3039 plays normally for the first 5-10 minutes after being tuned on. Then the screen goes blank. It turned off for a short period of time, the same sequence repeats itself. A friend suggested that the problem was likely caused by some faulty thermal protective device in the set and should be relatively easy and inexpensive to repair. Does the set contain such a device, and if so, where is it located? where can I buy the device? do I need a part number to buy?

Appreciate your help...... .

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Laafink:

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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It seems to be a heat issue. I have had this problem for over a year now. If I turn on a fan and have it blow into the body of the set behind the screen [either side] it solves the problem.

This may not be a permanent solution but it will keep your set running and costs nothing more than a small fan.

Posted on Dec 24, 2008

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