Hi, The answer to your question is answered in the "V-chip" section of the Sharp Instruction Manual for your set. I would go on line to download the instruction book, if you don't have it.
Here is a link to a site that you can download the manual from
http://www.retrevo.com/samples/Sharp-TV-manuals.htmlYou might want to try 00000 or 12345 as possible default settings that may be in your TV.
Sometimes it works,
The Manual will give you a code to remove the Lock and reset the TV
Good Luck,
Mark
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