1 TV shows a blue, green, or black screen. Your television is not getting a signal. Make sure that your cable or satellite box (or other device) is powered on and that the TV is set to the correct input - press Input, Source or TV/Video on your remote control. Check behind the TV for loose connections.

Freeviewis great content, free for all New Zealanders to enjoy Live, and to Record. Over a million Kiwi homes already enjoy great local and international TV and movies, free with Freeview. Freeview is built into Panasonic TVs, players and recorders, so you have the power to choose from a wide range of products to suit how you want to enjoy TV.
Thefirst thing to do is unplug the TV and leave it disconnected for 5 mins. Then plug it in and turn it on, without accessing any smart features put it into standby then back on, then standby then back on and check the light doesnt stay in yellow. Customer: replied 4 years ago.

Holddown the "Reset" button on the bottom of the remote for 10 seconds. After that, Let go of the button, and your remote will automatically power on. Make it a square by clicking on the top-left button (the one with an arrow). Afterward, simultaneously push the two bottom buttons on the remote.

Fix#2: Check the HDMI cable. If the status light is on, but you still see a blank screen, check your HDMI connection. Unplug the HDMI cable from both your TV and your Apple TV, wait a few seconds, then plug them back in and see if video appears on the screen. If that doesn't help, reset your HDMI input settings.
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why is my panasonic tv not responding to the remote