Hi all ive just bought a 55" lw4500 and when I hooked my Dvd player up via HDMI cable I get a picture but no sound, it worked perfectly on my previous Tv but not on my new one, its not a great Dvd player its a kaford dvx109hd.
Can't see a manual online, but please check what audio out option is setup on the DVD player; some LG TVs accept DolbyDigital audio, and all should accept PCM-stereo. Don't think any accept DTS audio.
Guess you've already checked the basics like the volume is turned up to something reasonable, and the TV speakers are turned on (do you hear sound watching ordinary TV?).
What options does the DVD player have for audio out, and what have you got selected? I'm thinking perhaps the DVD player can only send audio to either HDMI or SPDIF, or if it's got analogue multi-channel out, it's that or digital but not both?
You've not set the input name on the TV to DVI have you?