Unsupported mode on TV with Ps4?

The following problem: I had used the Ps4 several times, but now there's the problem. Today I switched it off after a short game and now there's unsupported mode, although I can still partially hear the sound or it keeps disappearing and coming as it wants
The HDMI ports are also okay and the reset didn't help either.
Does anyone know what else I can do?

This is the HDCP copy protection via HDMI, has the PS4 received an update and is the television software the current one?

The TV is relatively new and the Ps4 didn't have an update either. An hour ago it had worked without problems and nothing was infected.

https://www.google.com/...layout=amp

Unfortunately I can't see anything on the screen.

Since point 3

https://www.giga.de/...kein-bild/

I did it now. A friend brought me there blindly

Yet another problem. Now I can see something again, but I can't open Netflix