I have a Sony tv and have a humax box connected in one of the hdmi ports and my now tv in another port.
Both work well. The problem I have is when I change from my Now tv hdmi port back to my humax hdmi port it says the signal is not strong enough. The only way I can get it working is to power off at the mains.
I have stick powered from the tv.
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I believe the USB port on your TV needs to output 5V 1 A for the nowtv stick to be stable.
How many USB ports does your TV have and have you checked them all if they can output 1 A ?
What happens if you disconnect the HDMI cable on your television HDMI input port for the Humax Box and then with the television remote keep swapping the HDMI input source back and for (does the stick lose power ?).
You may have no option than to use the supplied power adapter that comes supplied with the stick.