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Hi, there! Thank you for sharing your question to us about the LG TV (OLED77C5PUA). Yes, you can connect the TV to an older Denon receiver as long as the receiver has an optical (TOSLINK) input. The TV includes an Optical Digital Audio Out, so you just need to run a standard optical cable from the TV’s optical port to the receiver’s optical input, then set the TV’s sound output to Optical in the Sound settings. You can explore the full feature list and support details here: https://www.bestbuy.com/product/lg-77-class-c5-series-oled-evo-ai-4k-uhd-smart-webos-tv-2025/JJ8VPZTRLJ. If you need more help, feel free to email us at lgdigitalcare@lg.sprinklrsupport.com. — Avril
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