I think you should first understand why the connection you had on the older TV does not work with the new TV.
1) Is the receiver actually working and switched to the red/white RCA cable (which input are the cables on, and which input is the receiver set to?)? Test this with another source, or just leave the cable end loose (TV end), turn the volume all the way down, then turn up the volume as you tap your finger on the center pin of each red/white cable tip. You should hear a buzz/hum as you do that. If no noise, you need to figure out why.
Cables are connected to TV Sound input on receiver and audio out on the TV. Leaving the cables loose and tapping the end and you can hear the tapping buzz sound through the external speakers.
2) Is the TV actually putting out audio on the connectors you plugged the cable into? Those might be inputs? They might be video out, rather than audio? There might be a setting on the TV menu to enable the audio output. Is the TV volume turned up?
Plugged into audio. Labeled audio on the TV with video next to it. Did not plug into video. On the TV menu I turned off tv speakers and turned on external speakers. Nothing. Tried it both ways though. Volume is up on receiver and tv. Tried it different ways though with tv sound down and only receiver volume up. And with Tv volume up.
Alternately, you might try hooking the receiver to the headphone jack on the TV (that's what I do, as my TV only has digital audio output, and the headphone jack is the only analog output).
What type of wire would I use to try this?
-ERD50