3,5mm audio out not working

[MikkoL]

On page 8 of 19 ( schematic ) the audio plug is a four connector plug < L, R, Grnd, Mic ]] ;  Samsung earbuds work well ( with the in-line mic pick-up );  there are others that will work as well as long as they are standard stereo buds with monoral mic puckup.

Make sure the plug is the standard four connector plug and that it is fully seated.

Tried a couple different cords that work with my Minix X8H+ ... no sound, just static humming.
Got things finally working with the SoundAbout app by forcing audio routing to wired headset.