Is there a serious TV channel which is for Buddhist community? I watch TV. As a Buddhist which TV channels should I watch?
While I'm not aware of any TV channels which are not geographically bound, I think you can use YouTube channels, that have regularly published content, as sort of TV channels.
Here are some Theravada Buddhist YouTube channels with content in English:

Buddhist Society of Western Australia
Yuttadhammo Bhikkhu
Abhayagiri Buddhist Monastery
Ajahn Sona
Vimutti Buddhist Monastery

Here are some Tibetan Buddhist YouTube channels with content in English:

Dalai Lama
Yongey Mingyur Rinpoche
Sakyong Mipham Rinpoche
Bodhicharya Dharma Channel