Panny TVs generally have red light on in standby. When remote ON is pressed that flickers on infra red reception to turn on to green and screen lights up etc.,.
Most have on-the-tv buttons to channel up/down power on/off etc.,. Do they work?
Check the remote batteries are OK.
Use a phone or table camera to 'see' the infra red emitted by the remote (point remote at the camera lens).
Find an read the manual for the exact model of TV?