No audio output on the speakers of TDK NX-4CD.How do I troubleshoot?

SOURCE: YP-T8 samsung digital audio player

Well, you answered your own problem. You need to get it fixed.

SOURCE: Headphone Jack

the plastic pieces on the top and bottom are just stick on. pry them off gently and you'll find four of the tiniest screws on the top and bottom(you'll need a precision screwdriver) after you remove the screw pull the metal pieces on top and bottom off carefully with the screwdriver. the whole piece is shoehorned in, but it will push out just far enough to reveal the aux. jack. you'll probably find that this piece is cracked and that is why it only play through one or no sides. i'm still looking to find this piece.
hope this is helpful to you,.

SOURCE: ipod touch music wont play, built in speaker works fine

Restart your ipod by holding the home and power button at the same time, this will restart it and should fix it.

SOURCE: I Erase accidentally something related to audio

back up your music and files on your mp3 player and go to the manufacturers website and download your firmware again and it will retore the mp3 player to the fatory settings

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SOURCE: when i plug in the audio wire to listen to it on

Your plug-in is not functioning properly. It appears it has become loose over prolonged use and is dirty. I suggest clean the plug-in by blowing air OR with a soft cotton wad slightly moistened with mild detergent ( Best is ear cleaning buds). Also check the wiring connection in the audio jack as that also can be loose OR fix a new Audio Jack