TV is not attached to anything. After running for 10 minutes or so. The T.V. turns off. I unplug it for 5 minutes or so, it comes back on. I have checked the sleep timer (not set). I have gone into service mode and reset . I believe there is an over current condition going on. Any suggestions how to isolate the component or board would be appreciated.
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).
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.
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Power down the TV. Let it cool down for several minutes
to avoid touching anything hot. There are many parts inside the TV that
could be hot.
Unplug the TV and all media devices attached to it. Let
the TV sit again for several more minutes just to be safe. The lamp
receptacle and other components could still be hot.
Unscrew the back cover of your TV with a screwdriver.
Have someone help if the cover is big. The lamp's housing unit on most TVs is located towards the bottom. Refer to your TV Owner's Manual
for specific instructions.
Unscrew the lamp's housing unit with your screwdriver. Take
your time to avoid damaging the housing unit. You'll see the lamp once
you open the housing unit.
Use a soft cloth to unscrew the lamp out of the housing
unit. There's a possibility the lamps- could still be hot. The cloth
will help protect your hand.
Screw the replacement lamp into the housing unit with the
same soft cloth. The oils from your fingers could ruin a rear projection
Reattach the lamp's housing unit and TV back cover. Make sure no wires are loose or get caught when screwing the back cover on.
Attach all media devices like cable or satellite boxes. You should now be able to watch your TV with a brand new picture.
It doesn't correlate to tthe trouble code in the users manual which are written. It sounds like a motherboard error. Try a cold reboot. Unplug the TV for 2 minutes then restart the TV and anything it is attached to. Unplug all first.
try connecting tv to cable direct also try unplugging both converter and tv for wile like 5 mins plug both back in see if tv and converter sync, but if otherwise then The ysus board is the most common reason. you can try websites on ebay.com to buy parts for replacement...
I had a similar problem with my Phillips 42 in. LCD HD TV.
Here's the problem. The Power Supply Board. I opened my TV
up(warranty was up of course) and found several bad capacitors.
Phillips and several other companies were sold capacitors that although
were highly rated failed within 5 years because of a lack of
preservatives. All sorts of electronic equipment is now being effected
due to these defective capacitors.
1. Take it in and have it fixed
2. Open it up, check the board for faulty capacitors(bulged or leaking) Buy a new Power supply board and install it.
3. Remove PSB, remove faulty capacitors and replace with compatible new ones.
These TVs have a self-check at turn-on, and will retry 3 x and then quit. Self-checks are like current overloads,voltages not present, IC communications not good, picture tubes not running. Can be anything without checking circuits.
Hi, I have a spare TU-PT700U that may be of use for you to solve your problem without having to replace your system. My Panasonic onyx series monitor was stolen out of my house, but they left behind the TU-PT700U and cable. If interested, respond to my craigslist post..