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Hi and welcome to the site, I’m Louie. Sorry you had to wait awhile but I’ll do my best to help.
Initially, have you tried unplugging for an extended period of time? ...and then plugging back in but into a different outlet?
And observe if the described "...turns on for 1 second then off and lights flash..." would immediately start upon just plugging back in? ...or only after attempting to turn on.
Yes please as these would be the only easy user doable tries.
All others would be internal.
No prob; post back with an update by then or when convenient.
yes please; try again and update.
I checked the repair/Service Manual and referenced the prescribed troubleshooting steps; a multi-meter would be needed for diagnosis and that the unit be plugged hence hence LIVE!
If not comfortable with a DIY (do-it-yourself) repair approach, then the service fee may be of a major concern.
Please post back how you would want to approach this and/or should additional information be needed.
Please confirm the blink pattern / sequence; power LED flashes twice and OPC LED flashes?
That blink code would be indicative of a low or missing voltage.
Please click HERE.
This calls for the unit to be opened, back/circuits exposed and voltage measured at the designated pin.
A friendly reminder; voltage measurements by its very nature requires that the Sharp be plugged in and therefore LIVE! Please exercise due care and caution.
Please post back results / observations of the above once tried.
Copy that; please click HERE for the schematic diagram.
Preliminary voltage check on pin 3 of IC9606 of the MAIN board.