First you check the speaker of your Daewoo Tv. To check the whether the speaker is good or damaged, place your year very close to the speaker side of your TV, and switch the TV by its front panel power switch, not by the remote control. If you can hear a "Thumb" sound from the speaker, as the TV is switched on, the speaker is good and you have to to further. If not speaker has got damaged and have to be replaced.
If your TV is provided with an earphone or headphone socket at its fron panel, insert a earphone or headphone pin into it and listen whether there is sound coming from it or not. If ther comes the sound, it doesnot comes to the speaker, means that the headphone or earphone socket is faulty. Replacing it will solve the problem.
If there is AV OUT from your TV, connect it to an amplifier or so to get the sound. If there is sound and no output from speaker, means the Audio Output IC inside your TV is faulty.
Just locate the audio output Ic, and replace it with same type and number. Audio Output IC can be easly located ans speaker wire goes to that section, and follow the speaker wire. locate it. If you need any more assistance, feel free to contact me through Fixya. OK.