Can't connect my 2009 macbook pro to new 2011 LG TV

I just got a new LG LED LCD TV and I'm trying to connect my 2009 macbook pro to it. I bought a Belkin Mini Display Port to HDMI Adapter at the Apple Store. I also bought the Apple HDMI to HDMI 1.8m cable to connect the computer to the TV. I set up the video fine by using System Preferences-Display. Unfortunately, the sound does not work though. I bought a Dynex stereo mini to RCA "Y" cable to connect my computer's head phone jack to the Audio In RGB/DVI port on my TV. The problem is that I can only get sound to work when I set the input on my TV to AV1. I can only get the video to work when I have the input set to HDMI/DVI. I need to be able to get them to work simultaneously. Can anyone offer me some advice?

Brian in Fla wrote:
Unfortunately, you won't find your TV audio in the System Pref > Sound section. Macbook pro's, before 2010, don't have the ability to send and audio signal through the mini display port. They can only send video. Apple added the new hardware for audio in the 2010 models. You have to use a seperate audio cable from your MBP earphone jack and plug it into your TV. This can be a problem sometimes too. Depending on your TV. I ran an HDMI cable to my TV and I plug my MBP earphone jack into my portable Bose player. That works pretty good.
I think you need to go into System Preferences>Sound, and make sure the output is through the Headphone Port.

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