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This is because of a power supply unit going out inside and there is not much you can do accept for have it repaired or think about new at this point also with the new digital tv standars comming out you are going to need a box for this if you doing OTA anyways so at this point if you are not inclided to haing it repaired have it recycled.
One possible reason is the remote may have an "IR leak" where it is turning off the TV by emitting a signal of it's own. To verify this, simply remove the batteries and turn the TV on. If it stays on, that was the problem and you would need a new remote. If this doesn't resolve this, try a power drain to rule out over-charged capacitors:
1. Unplug the product's power cable so the device is not grounded to the house.
2. Press and HOLD the product's own power button for 1 minute to drain the capacitors.
3. Plug the product back into a wall outlet and try to turn it on.
Note: This procedure works with battery operated devices as well so remove the batteries and
hold down it's power button. Electricity can remain in capacitors and on circuit boards
enough to prevent normal functionality. By clearing the residue electricity, your product
will have a fresh start and many times this will resolve a buggy or non-responsive device
that appears to be dead.
You have problems with a condenser that allow the power supply to maintan an acceptable level of voltage in order to keep the TV on. take to a tech to be fixed. unfortunatelly, this problem needs a tech to take measures in the circuitry to find the component that causes the problem.
When you let it sit for approx. 15 minutes it will come back on and usually stay on. I've also noticed that the color will fade in and out at times.
during 15 mts of your sitting do you get sound & less brightness then problem in video or luminance section.
if picture is dim & color will fade in and out at times then possibility of crt is getting less voltage on g2.
if set is old then there is a possibility of crt getting weak.
but if the above things are not there then problem in power supply.