Facing TV Problems? Ask a TV Technician.
Hello, and sorry you're having problems. The issue you're running into is that this new TV does not use older style RCA red and white jacks for audio. On the TV those are for INPUT- not audio OUTPUT.
The only audio output on this TV, is the "Optical" (digital audio out) jack, and this requires a converter if you're going to try to use it with older receivers. The converter is below:
You will then connect it to the TV's optical port, using an optical cable, and from there the converter gives you standard RCA audio output jacks, you can use to connect to your older receivers and get sound form the TV.
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That converter and the optical cable you need to make this work can also be purchased though Best Buy. The optical port on the TV is a small squarish jack labeled "Digital Audio Out", or "Optical Audio out". This is needed to connect any receiver to the TV, if the receiver does not already have an Optical Input.