Old topic I know, but I created it so live with the bump! lol
So my 16-year old cousin brought his Pi Zero I built for him over to his buddies house and the sound wouldn't work. Regular consumer-style like 50" flatscreen (he didn't remember the brand/model), with the same cable he uses at home. After my other cousin had an issue with sound on an older ~32" Sony I've used hdmi_drive=2 on all of these. Any suggestions on what to try?
The elinux wiki says to also try adding:
hdmi_force_hotplug=1
hdmi_force_edid_audio=1
but I honestly have no clue what those do and haven't seen them referenced anywhere else...