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1. Turn TV on 2. Point the remote at tv and Hold SET and TV buttons at the same time and keep pressed for 3 seconds. 3. The LED flashes and the remote control starts the automatic search. 4.The OFF signal is automatically sent to the tv from the remote control. 5. Once the TV switches off press any button except SET to stop auto search. 6. Switch your tv on using the POWER button.
could be the remote sencer that is in the tv or bad swithes that are leaking. I have seen this happen before the sencer is a small electronic eye that picks up the signal from your remote when you push the buttons on it. The switches im talking about are small button switches that are soldered to a board right behind where you would push the power button and chanel buttons on the set itself. I would start with the switches frist if it was me. Some times you can trace the wires on the front where the switches are and unplug that set of wires and stil use the remote to turn on the set to see if it still does the same thing. The remote sencer on some models are pluged in seperate if so then this should help you to trouable shoot this problem.
There might be something wrong with your TV Set power supply. I guess it switches off because of damage to all the electronics prevention. You should call to you local repair service or if it is still hasn't expired the warranty, call the warranty service
It's probably a tact switch problem, something we call in the industry awindex syndrome. The tact switches, depending on the ones effected, can turn the tv on/off by itself, channel +/- at will or in your case control the volume.
Tact switches are not expensive to replace but a bit difficult to get to if you're not trained. They are at the very front of the board - looking from the back - and some disassembly may be necessary to take the main board out.
A reputable shop wouldn't charge much do fix this problem, switches are about a dollar a piece.