TV does not play sound via HDMI. In the past it did, I suppose a maintenance session or an automatic firmware update has spoiled it. The HDMI cables tested are 1.3 and 1.4 and I've tested at least 4 different devices without success. The firmware version installed is Q554E-

The image quality of the TV is very good, the sound plays fair enough, but the aditional features (like smart TV) are not working properly, the remote commander seems not to fit all the TV's features...seems that this product has not been even finnished when launched to the market.