TV switching to Rasplex input automatically

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1

Hi,

i connected my Pi with Rasplex direct to my Samsung 55h4690. I use the samsung usb sockets to power the Pi. CEC is activated.
Everytime I switch on the TV, after half a minute, the TV switches the input from TV to HDMI1. It seems, that Rasplex tells the TV to set HDMI1 to be the active input.
I tried to deactivate this feature, but did not find it.

What can I do to prevent the TV switching to Rasplex automatically?

 

 

PS: There is no option in TV´s preferences to disable to an active source.

2

Preferences -> System -> Input Devices -> Peripherals -> CEC Adapter

Its one of the options in there, not in front of my  pi at the moment so cannot remember exactly which option.