Update: audio problems connecting macbook pro to insignia TV: resolved

Question

There have been posts from users who have expressed frustration that they cannot get audio when they attempt to connect their macbook pro to an Insignia TV.
http://discussions.apple.com/click.jspa?searchID=-1&messageID=10830387
http://discussions.apple.com/thread.jspa?threadID=2192206
Insignia customer service also attempts to state that the pre-April 2010 macbook pros cannot get audio output to the TV, because the units are designed to get the audio on the same HDMI and no alternative audio input is available on the TV.
http://community.insigniaproducts.com/t5/Televisions/Connecting-MacBook-Pro-to-T V/td-p/5564
For the Insignia models (from 2010 onwards and possible some from 2009 as well), there is a simple workaround that does not seem to be published elsewhere on the internet (as far as I can see):
Use the HDMI port 1 only (audio does not work with port 2, port 3 or port 4) to connect your macbook and you will receive 1080p video signal.
Use a mini stereo audio cable (example link below) and connect your macbook audio output to a designated green color coded audio port on the TV located right next to the VGA. You will receive full stereo audio.
Example link for mini stereo audio cable:
http://www.amazon.com/gp/product/B00116VJIO

Answer 1

I recently acquired a new Insignia TV and had sound trouble.  I went to Best Buy to inquire about the cable in the link above and the sales manager had doubts.  He recommended a RCA cable with a male connection at both ends.  The RCA jack is on the bottom edge of the TV display next to the VGA connection.  The sound worked perfectly using the RCA cable from the headphone jack on the Mac.  I connected the video with a HDMI adapter from the monitor mirroring port.