MY SON LOCKED MY SHARP TV BY ACCIDENT.
IT WORKS BUT ONLY FOR A SHORT AMOUNT OF TIME.
A DISPLAY APPEARS ON THE SCREEN REQUESTING TO ENTER
A CODE/PIN TO UNLOCK.PLEASE HELP!, WHAT CAN I DO TO
UNLOCK? THANK YOU IN ADVANCE FOR YOUR TIME AND ASSISTANCE, I APPRECIATE IT.
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Unlock all of the channels on the TV by entering the factory-reset code. There are three main reset codes that TV manufacturers set. These are 0711, 6688 and 3308. Try each one until you find the one that works. This will reset the TV to original factory settings. When you do this, you will loose any information that you have stored in the TV, such as favorite channels, automatic timers and the clock. You will have to go through the full initial set up. If you wish to get some details, http://electronicshelponline.blogspot.com/ Pull up older posts.
This could be several things, but most likely a burned loose resistor or bad solder joint.
All of which causes an inoperative power supply with the result of having a "dead" set.
It would have to be checked out to find the problem.