help please 10.2" FLY TOUCH 3 X220 EPAD HELP hdmi

[bill4676]

GOT THIS ANDROIDE PAD 10.2" FLY TOUCH 3 X220 EPAD
all working fine part from hdmi; works great on my son,s 19 flat screen put it on my 42" philips cineos tv i get picture but no sound ive been into ever thing on the tv and the pad but no success with it its doing me head in now

THANKS FOR ANY HELP INADVANCE