The main reasons are:
1, the file format is not right, that is, part of the file format TV can not be perfectly compatible, resulting in decoding and playback errors, so there is no sound.
2, the TV's sound channel settings are not right, part of the video file is the left and right channel to have sound, and the TV's default channel is stereo, so you need to switch the TV's sound channel to match the file mode to make sound.
3, the source file is corrupted or has no sound information itself, you can only replace the other files to playback test.
There are many reasons why you can't put it out: for example, the format is not right, the general square dance equipment can only play MP3 format, go check it out. For example, U disk is bad, first check in the computer, you can see if you can open in the computer, can play, especially MP3 playback. These two problems can be solved by checking.