Yes there are 4 HDMI port in the led tv and the tv automatically takes hdmi output as default once you enter in the HDMI option. I have googled on this topic but nowhere it is mentioned to disable other speakers in the speaker option. When i played a song i could see the fluctuation in bar graph which is beside the hdmi ouput audio option which means that the hdmi audio is enabled and also it is set default(rite clik on sound icon from task bar then select playback option). Here you will see more then one speaker, all of them enabled so the TV gets confused and hence could not play the sound. Disable every other speaker except the HDMI audio output.