The model number of the TV would help.
In general most TVs have digital optical audio output and your old receiver may only have analog RCA inputs. You will need one of these to connect them http/www.parts-express.com/parts-express-dac-digital-to-analog-converter-%2851-compatible%29--180-999
plus the cables.
The TV volume control will not work through this connection so you will have to use the volume control on the Sony.