Welcome to the forum!
To listen to the TV by itself without using the receiver, you should be able to just turn the TV speakers on. If you'll let us know which model of TV you have, we can help with that.
As for the HDMI issue, it might be a defect. On my Pioneer receiver (made in 2009), it takes somewhere around five seconds for it to sync up to an HDMI source when I change inputs. So, if yours takes a few seconds but eventually shows the source, then that's probably not a defect but simply how long it takes to complete the HDMI handshake.