THX, that should fix my problem. The bad thing is, i bought an adapter from HDMI to micro HDMI and with the adapter it is not possible to connect my TV to the other micro HDMI port of the Pi. I will order a new cable.
when I start my new RPi 4 it always freezes when "connecting to pulse eight CEC adapter". The few seconds before connecting on startup the keyboard is working. The RPi is connected with my Denon AVR-X2200 which is connected to a Panasonic TX-58EXW734. My RPi 3, Odroid and Fire TV all work fine with CEC. Any other suggestions than waiting?