IPTV channels may have no sound due to unsupported audio codecs (such as AC3 or EAC3), incorrect transcoding, muted audio tracks, or player incompatibility. Some older TVs and IPTV apps cannot decode modern audio formats. Switching to another audio track, updating the player, or using a more advanced app usually solves the issue. Glanfy recommends using IPTV players that support multi-codec audio for maximum compatibility.