Facing TV Problems? Ask a TV Technician.
Hello, Sorry you're having problems. Offhand this appears to be that the TV's Mainboard is locked up- which in many cases requires replacement to fix the issue.
However it's worth it to try a hard reset, as sometimes the processor in the TV can simply have locked up.
The first thing you would try, is disconnect the set from power, then press and hold the power button on the TV itself (not the remote), for 10 seconds and release. Then plug the set back in, and also check that the power cord is connected tight at the TV as well. Press power once, and see if the set powers up normally. Try this procedure up to 3 times, and please let me know what happens.
Are you still having the same problem?
If so, then the part number: Sharp 9JY0150CTN06100 Main Board would need to be replaced. This board is the brains of the set and processes the turn on/off commands. If the Sharp logo does not display on your screen and you cannot shut the TV off without unplugging it, the Mainboard needs to be replaced.
A shop will generally charge close to $275 parts and labor for repair and can be located at the link below if you'd like:
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Do you need further assistance with this?