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Hello, new model TVs do not have analog RCA jacks to connect 2 wires of sound system, however, these TV would have optical audio out or digital audio out jack, optical audio out needs optical cable and digital audio out needs coax digital audio cable, both jacks provide digital audio signal that can be converted to analog audio signal for analog audio system like you have.
There as digital audio to analog audio converter device available (please check following link for more details) that can be used, connect optical/digital audio out (whatever is available at your TV) to converter device and plug 2 wires of your sound system to get the sound of TV.
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