Greetings, I'm assuming the TV will operate manually with the buttons on the front of the TV, but not the remote. Right? First, you might try to reset the TV using this method:
Manually turn the TV on with front panel Power button. Then, with no cassette inserted, hold Play and Rewind buttons on front of the TV for 5 seconds or more. The TV should shut off. Turn it back on and go through the setup procedure. Try the remote and see if it works.
There is also a Child Lock mode that might be activated. With no cassette inserted, turn the power to the TV on manually, then hold REC/TIME on front of TV for 7 seconds or more. Should see "No Cassette Inserted...." Disregard this message and keep holding REC/TIME button until you see VCR LOCK OFF on screen. If you see VCR LOCK ACTIVATED then hold down REC/TIME again until VCR LOCK OFF appears on screen. Try the remote again.
The other possibility is that your TV remote or remote circuit simply is not working:
Here is a quick remote control
First, make sure you have new batteries in the remote. Then, using a digital camera powered on as your remote tester, aim the original Panasonic remote at the camera lens and press a button on the remote. Look into the screen on the camera while pressing a button and see if you see a bright blue light. If so, the remote control is working.
Therefore, I would suspect a defective remote receiver or power supply circuit in the TV. If you're experience repairing TV's I can look up the part number of the remote receiver for you. But, if you're not, then I would suggest calling a TV repair service as there are dangerous voltages inside a TV whether they are plugged in or not.
If you don't see the light on the camera screen, then do the same test with a known working remote just to make sure your camera is picking up the signal. Every digital camera I've tried has worked for this test, but you never know. If other remotes show the light on the camera screen, but not the Panasonic remote, then you should start with buying a new remote. I can look this part # XXXXX for you as well.
I hope this helps, and if so I would appreciate if you Accept and leave some feedback.
Thank you, Greg