First try a firmware update from the manufacturer's web sight (look under support heading). you can do this yourself. if that doesn't fix the problem replace the main board.
Press Power + Vol Down button from LCD TV "k" will appear on screen after that press Ch Down & Vol Down at a time from LCD TV. Go to 10/9 page by remote and run EEP Cleared.
If the set was working okay when new, and this fault happened over time, then this must be from something that has failed on one of the circuit boards. This may not necessarily be from the power supply itself.
Most likely one of the boards has a component that is failing and causing the protection in the power supply area to do a reset of sorts. The only way to find this is to try each of the boards until the fault is determined. In rare occasions there can be more than one board faulty to cause this. The service rep would try each of the boards until the fault is found, and then leave the working board(s) in the set on test for at least 24 hours. After that they would give the estimate to the customer.
Servicing these new generations of TV sets out of warranty can be fairly expensive. If the set has a number of years of use and is out of warranty it is usually a better option to replace the set than to service it. After one of the boards fail there is odds that other boards could soon fail. The MTBF for most of these sets is in the range of 40,000 to 50,000 hours depending on the model and specs. This is equivalent to about four to six years...
SOURCE: sharp aquos 46 picture disappears intermittently
it might mean there is an intermittent connection or cold solder joint somewhere inside the set.
But I wouldn't just settle on that.
Here are some other things to check:
1) Replace the batteries on your remote control.
2) Try resetting the logic functions on your tv by unplugging it for a minute, then plugging it back in.
3) Try covering up the infra-red receptor on the front of your TV to
see if you're getting unwanted signals from the receptor. taping a
piece of foil over that area is perfect. If it doesn't stop after doing
these two things you'll probably need to take it to a shop.
4) If this does stop it, then look for unexpected signal sources. Have
you added a remote control extender? Added a new device to your
audio-video system? Changed to a new remote?
Here is what I suggest:
ONE: Give it a hard reset. Possibly the software codes in the power
management are corrupted. Just unplug the tv line cord for 4 hours.
That will reset everything internally to factory defaults.
TWO: Give it the old whacking test. Just bang on the cabinet in many
places with your hand or fist. That will restart any cold solder joints
or loose connections.
THREE: If the above procedure does not help, then you will have to call
in an expert tv tech; OR just live with it and put in a line cord
switch so that when it is OFF, it is really OFF.
SOURCE: truns on off by its self
what do mean you jus sitting there and it comes on how often does the tv do this
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