Make sure your sound bar is powering on. Trying to get my Roku TV (50S425) to work with my Yamaha AVR. I checked the PS4 audio settings and it's set to output to digital out (optical). Please reboot the cable box by unplugging it from power for 10 seconds and plug it back in. I have the AV1 channel hooked up to the tv to use the optical cable. Nothing will get the sound to actually play thru the AVR speakers. I checked the optical cable and there is red light from it. 1. hi Logi & Hedgehog1979. The optical cables are brand new, I do see red light out the ends, optical cables "click" when inserted into devices, I ensured the input was selected correctly on the receiver, I selected optical audio on the receiver, and I tried playing with the audio settings on the cable box and TV. Red light is emitted from my port through the cable as intended. Then I noticed it says "turn on the power of the connected device." Done all that Hedgehog1979! Once it reboots check for sound again. No audio from VIZIO Sound Bar. In this mode the audio card tries to send digital data through an optical cable (hence the red light). No "stereo" audio option in TU7000. I switch to external speakers and no audio at all from any sources, hdmi, red… I'll explain again. If still no sound, then do you have another optical cable you can try (the red light isn't conclusive of a good signal, the cable itself could still have low bandwidth in the optical … My sound swiched automatically to optical out, but I am not getting any sound through my devices. Optical audio out from my c8000 to my home theater system (and old spare receiver) does not work. The home theater is a DVD player, tuner, and has Av1 & Av2. -Optical cable from TV to Home Theater (for surround sound). in HD and UHD TVs Tuesday; Q60 QLED TV / eARC incompatibility [TV Bug] in HD and UHD TVs Monday; Samsung TU850D continually programs sound bar in 4k, 8k and Other TVs 3 weeks ago; Optical audio not working with TV apps in 4k, 8k and Other TVs 3 weeks ago The standard was introduced way back in 1983 by Toshiba, and was originally intended for use with their fledgling Compact Disc players. With me saying there is No red light means there is no optical feed coming from the box. The problem is that I can't get sound through my TOSlink devices. Press the button on the right side of the Soundbar or the SOURCE button on the remote control to select the D.IN mode. 1. Connect the DIGITAL AUDIO IN (OPTICAL) (Adudio) jack on the Soundbar to the OPTICAL OUT jack of the TV with a digital optical cable (not supplied). Usually this is a separate port, but some notebooks have this implemented through a shared port. Unlike other cabling standards, the optical audio system uses fiber optic cables and laser light to transmit digital audio signals between devices. Thanks for your replies. Optical Audio is half the volume it should be. Once the optical cable is plugged in, click the speaker icon at the bottom-right corner of your Windows taskbar, then click the speaker name above the volume slider to see if an “Optical” or “Digital” sound output has shown up. I think the next route is a replacement box. If you are not seeing any lights make sure the power cord is securely connected to the outlet and the sound bar. I plug my optical cable into the jack. Only option on the receiver is optical, no HDMI port exists. My jack works normally. What version of Windows do you use? I connected the PS4 to the receiver via HDMI, so I know the PS4 is outputting sound. 2. Cheers I use it for Dolby Digital / surround sound and by the optical cable from the sky box to the amp. When your sound bar powers on a light will appear on either the left hand side, or the center of the bar. I am aware of this common fault.