The tv sounds doesnt work

Http://www.eserviceinfo.com/downloadsm/44458/Daewoo_DTQ-14N2FC.html
Above is a service manual for your chassis.
It could be, first though, check it isn't on MUTE, check, volume is set right, IF all is well, then you may indeed have an Audio output problem, you will need to then get this looked at by a professional. A simple, audio repair, say the audio output IC, needs replacement etc, would cost around, $180.00. What you need to do is take the unit in for repair and ask for a 'Quote" for repair, before proceeding.

Check the mute control from your remote. If ON/OFF is working ok, it may be sound circuit problem or speaker