Some of the files that I try to play from my external storage device have no sound.
This can be due to the fact that the video has audio in AC-3 format. This TV is not compatible with this kind of audio format. So, try with another audio track or use an audio converter software.
What is the default password?
The default password is 6666.
Why the surface is heating in my portable Energy player ?
When the player is used for a long time, its surface is heated. This is not an error. To turn it off for a bit cool and keep in a room with adequate ventilation.