Or use an adapter like this:
Either one will combine a stereo audio audio signal from your USB port (in the first case) or a digital 5.1-channel audio signal from your headphone port (in the second case) with the video signal from your mini-Displayport and send them together to the TV via HDMI. No second cable required, but the cost is higher.
I'm also trying to get my MacBook Pro to hook up to my HDTV. I have a 15" MacBook and a Sony TV.
I bought this mini displayport http://www.amazon.com/gp/product/B003BERYLA/ref=oh_details_o00_s00_i00
and am able to get the video to display on the TV as well. I had read that I wouldn't be able to get audio through the port (and I can't), so I bought a mini-jack to RCA cable from the headphone jack as mentioned above and mentioned many other places I've searched. But, I can't get the display and sound to work at the same time. If I have the HDMI cable plugged in, I can't get the sound. But if I unplug the HDMI cable, I get sound.
Any idea if they will actually work together? Or should I get an adapter like eww suggests? Or, does anybody know if this would work for my Mac? http://www.amazon.com/Griffin-Technology-GC17096-DisplayPort-Converter/dp/B003CK 8TZ8/ref=cm_cmu_pg__header
AjayTPH, have you had any results?
Most TV sets have a particular HDMI port that must be used for the video when a separate feed is used for audio. The other HDMI ports assume that audio will be coming through them along with the video. Therefore, any separate audio feed is ignored when the video input is through one of those ports. So check your TV set's user manual for guidance on which HDMI port to connect to, and then when you select that HDMI port in the TV's input menu, the audio input will be selected along with it, and you'll have picture and sound together.
I think @eww hit the nail on the head here, usually televisions (or home entertainment AV receivers) have different sources (HDMI 1, HDMI 2, component 1, etc.) that have concerted video and audio feeds. If you try to mix and match video and audio feeds, chances are the video and audio won't appear on the same 'source' on the television. You're in luck though if your TV features an HDMI video along with an external, accompanying audio input.
According to@Templteon Peck and an article I read, MBPs before 2010 do not have audio transmitted through the MDP. So if this is the case for you, as it is for me, you might have to look at options @eww had mentioned in his first post.
I think I'm going to stick with a mini-jack from my computer to an external speaker system for now, as I don't want to drop $30 on the monoprice cable.