Play TV Sound throug home theatre SONY DAV-Z150K

Your Sony HT only has analog audio inputs (which connect with a standard RCA stereo audio cable) but your TV probably only has an optical digital audio output so you will need to add a digital to analog converter such as this.
http://www.radioshack.com/product/index.jsp?productId=12075975&utm_source=Google&utm_medium=PPC&utm_term=11148888&utm_content=Exact&utm_campaign=PLA&cagpspn=pla
This will connect to the TV with an optical cable and to your HT with the RCA cable mentioned above (cables not included).
It is kind of stupid for a manufacturer of a home theater in a box not to put the optical digital input on it since all TV makers have given up on the old school analog audio outputs. This includes Sonys' own TVs.