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You will only be able to use the HDMI if you tv has an output for it(for other things beside built in DVD player of home theatre). It can not be an input. If you want everything that plays through your tv to then play through your home theatre the easiest way is to use white and red composite audio cables(some call them rca cables) More than likely you tv will have this output.They will go from the output of the tv to the input of home theater. If your home theater has a Blu-ray or DVD player you need to use the HDMI from home theatre out to in on the tv. If you tv happens to have and OUTPUT for fiber optic audio or digital coaxle audio on your tv and your home theatre has same but as inputs that will work as well with a better quality sound. However this is very rare.
switch the HDMI cable to another HDMI port (if available). or use and AVI/COMPONENT to make sure the device (HOME THEATHER) is working fine. Try also another HDMI cable or hook another device into it to see how it works. If you determine the HDMI port in not working properly, then your Mainboard is damaged and need to be replaced, try EBAY for a general
picture of prices but you will need your product code wich is located
in the back of the TV next to serial number.
Do you get sound on Audio Line-Out pins of LG TV? You can check sound at Audio Line Out pins by connecting any Amplifier / Home Theater system. If TV has sound out at Line Out terminals, then Output Amp is defective in your TV. If there is no sound on above said pins, then its some thing complicated and needs service manual to rectify. Good Luck.