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Hi , I`m JackPerhaps I can help you with this problem.
I`ll start by saying that intermittent problems like these are the worse to work on as they can occur at any time and that makes it difficult to pinpoint but there are 2 circuits that are suspect here and that is the main board and power supply so right now it depends much on what type of reset you are doing to bring it back .
Are you talking about the reset buttons like system reset at the back of the tv ?
Some older sharp tv had 2 of them , is that what you are using ?