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Maybe. If you bring up the menu as soon as the set turns on and then keep checking/stepping through a bunch of menu items past the 21-seconds moment, does it still go blank and then back on? If it does, is the menu still on, in the same place as before? If so, I would be less likely to think it was a software-type problem.
Set it on a (non-existent) analog over-the-air channel, then turn it off and back on and see if it still blinks. As above, if it still does, I think it would be less likely to be a software problem, but if it does not, then it could be.
Also, if you did not do so already, go into the menu and pick "factory defaults" or "reset" or the similar command.
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Chris
Quote from another forum: "(Antique TV collecting) always seemed to me to be a fringe hobby that only weirdos did."
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