“Only accepted optical input from Sony surround/ DVD .WONT PICK UP HDMI AUDIO”
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Hello there! We understand your inquiry regarding your LG 77" Class B4 Series OLED 4K UHD Smart TV (Model OLED77B4PUA) only accepting optical audio from your Sony surround/DVD and not picking up HDMI audio. We appreciate you sharing the details, and we’d like to help you get sound over HDMI as intended. First, please confirm that you’re using the TV’s dedicated HDMI ARC (Audio Return Channel) port to connect to your Sony surround receiver. On the back of your OLED77B4PUA, you should see one HDMI port labeled “ARC” or “eARC.” If your receiver also supports ARC/eARC, be sure to use an HDMI High-Speed cable (preferably Ultra High Speed) plugged firmly into both the TV’s HDMI (ARC) port and the matching HDMI ARC input on your receiver. Here’s one troubleshooting step you can try: Enable ARC/eARC and set the TV’s Sound Output to HDMI ARC • Go to Settings → All Settings → Sound → Sound Out. • Select HDMI (ARC) or RX (HDMI ARC) instead of “Optical” or “TV Speaker.” This tells the TV to send audio through the HDMI ARC channel. • Next, navigate to Settings → All Settings → General → SIMPLINK (HDMI-CEC) and make sure SIMPLINK is turned On. SIMPLINK allows the TV to control connected devices over HDMI, ensuring that ARC functions properly. • Finally, under Settings → All Settings → Sound → Sound Out → Digital Sound Out Format, set it to PCM (if you’re unsure whether your Sony receiver supports Dolby Digital or DTS over ARC). PCM is a widely compatible format that most receivers can decode. After adjusting those settings, power-cycle both the TV and your Sony surround (turn both off, unplug them for 30 seconds, and plug back in). Then turn on the TV first, followed by the receiver. You should now hear audio via HDMI instead of optical. If you still only get sound through optical, double-check that your receiver’s input is set to the HDMI ARC port (sometimes labeled “ARC” or “HDMI TV”). If the receiver is set to a different HDMI input, it won’t pick up the ARC signal from the TV. If the HDMI ARC port on your TV or receiver isn’t functioning, you can also test with a different high-speed HDMI cable—or try the same cable and port with another HDMI-ARC-compatible device (like a Blu-ray player) to isolate whether it’s the TV port, the cable, or the receiver port. In some rare cases, a firmware update on the TV can resolve ARC handshake issues; you can check for updates by going to Settings → All Settings → General → About This TV → Check for Updates. https://www.bestbuy.com/site/lg-77-class-b4-series-oled-4k-uhd-smart-webos-tv-2024/6578055.p?skuId=6578055 If you continue to experience difficulties after trying these steps, please send us a private message on social media @LGUSSupport. Our team can gather more information about your exact connection setup and guide you through any additional adjustments or tests. We appreciate your patience as we help you get HDMI audio working seamlessly with your Sony surround. —Renzo
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