Hi guys hopeing some one can help i have a 4k firestick on the back of my tv i have 3 hdmi ports on it. i have tryd the firestick on all 3 ports it boots up ok and when it loads the amazon home page it does make a sound. but when i open up iptv i get a picture but no audio at all . i have tryd the stick on 2 olther tvs nd it works fine opn them. any help would be great. thanks