Samsung TV & Audio HW-S800B Ultra Slim 3.0 Channel 360 Watt Soundbar with Dolby Atmos and Bluetooth D.IN Error Fix: Digital Optical Input Selected — No Audio

Error code D.IN on the Samsung TV & Audio HW-S800B Ultra Slim 3.0 Channel 360 Watt Soundbar with Dolby Atmos and Bluetooth means: Digital Optical Input Selected — No Audio. Display shows "D.IN" indicating the optical (Toslink) digital input is selected. If no sound is heard, check: (1) optical cable is fully seated in both devices — the connector clicks in, (2) the source device (TV) is set to output audio via optical: TV Settings → Sound → Sound Output → Optical, (3) audio format is compatible — set TV digital audio output to "PCM" or "Bitstream" (not "Pass-through" unless the soundbar supports the codec). Try a different optical cable. Inspect the optical ports for dust or a broken fiber tip inside the port. If the red laser light is visible from the cable end, the source is transmitting. Samsung soundbars auto-switch inputs — press Source on remote or soundbar to manually select D.IN.

The most successful fix is "Replace Faulty Optical Cable and Inspect Soundbar Optical Port" (medium difficulty, ~25 minutes). Estimated DIY cost: $10-$20. HomeMD has 2 community-ranked fixes for this error.

This error is rated low severity. It is generally not urgent and can often be resolved with a simple DIY fix.

Yes — the top-ranked community fix ("Replace Faulty Optical Cable and Inspect Soundbar Optical Port") is rated medium difficulty and takes about 25 minutes. Tools needed: Flashlight, Compressed air canister, Toslink optical cable.

DIY cost: $10-$20. Professional repair typically costs $120-$180. Many homeowners save money by trying the top-ranked community fix first.

The Samsung TV & Audio HW-S800B Ultra Slim 3.0 Channel 360 Watt Soundbar with Dolby Atmos and Bluetooth has 8 other known error codes, including: ARC (HDMI ARC Input Mode — Connection Issues), ARC NO AUDIO (No Sound via HDMI ARC/eARC Connection), AUDIO DROPOUT (Audio Drops Out Intermittently), AUTO STANDBY (Soundbar Auto Powers Off After 15-20 Minutes), BT (Bluetooth Mode Active), and 3 more.

Error code D.IN also appears on 2 other Samsung TV & Audio models: HW-B650 3.0 Channel 330 Watt Soundbar with DTS Virtual:X and Bluetooth, HW-Q990C 11.1.4 Channel 546 Watt Soundbar with Dolby Atmos, DTS:X, and Wireless Subwoofer. The fix may vary by model, so check each model's specific page for tailored repair steps.