Connecting June '09 MBP to a TV - No sound.

I recently bought an audio splitter in addition to my HDMI adapter cord. So far, I am able to successfully to set up the TV with sound and audio, but when I switch into Windows with the same setup, I still receive sound, but no audio. Is the '09 MBP's sound card (Cirrus Logic) able to transfer sound on Windows, or not?
I have currently set my headphones as the default sound port - still no results from the TV. Are there any alternative ways to transfer sound?
- Macbook Pro 15" 2.66C2D (June 2009)
- Cirrus Logic CS4206
- Windows 7 (64 bit)
- HDMI cord + converter
- Belkin Audio Splitter (Red/White)
Thanks in advanced.

Well, it's not the cable. It's about 3 year old sony 27" flatscreen. My input choices are not specifically audio. I've tried a monster cable 1/8" to rca and then I bought a sony to try (same config), but no luck. I thought maybe the tv wouldn't push audio through if there were no video signal, but that's not the case (tested with my dvr video going in with the aex audio). The AEX works with headphones, so I'm not sure what the problem is. I live in a small apt, which is why I don't have a more traditional audio setup. I've used aex's before to a receiver with no problem. I wonder if I need to send it to powered speakers?

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