Why is my LG OLED B3 HDMI CEC not working?

Common causes include software issues, connectivity problems, and settings misconfigurations. Follow our guide to fix your LG OLED B3.

How do I fix LG OLED B3 HDMI CEC not working?

Start by restarting your device, checking connections, and updating firmware. Our step-by-step guide provides detailed instructions.

When should I call support for my LG OLED B3?

If troubleshooting doesn't resolve the issue, or you encounter persistent errors, contact a certified LG technician.

LG OLED B3 HDMI CEC Not Working

If your LG OLED B3 HDMI CEC not working problem is preventing connected devices from communicating properly, you're not alone. HDMI CEC (Consumer Electronics Control), called SimpLink on LG TVs, lets you control multiple HDMI-connected devices with one remote—turning on your soundbar when the TV starts, or adjusting volume automatically. When this feature fails, you lose convenient unified control and may need multiple remotes just to watch a show. This guide walks you through proven troubleshooting steps to restore CEC functionality on your LG OLED B3 television.

Check and Enable SimpLink Settings

Before troubleshooting deeper, verify that SimpLink is actually turned on. LG's implementation of HDMI CEC requires manual activation and sometimes resets after firmware updates or power outages.

Access SimpLink Settings: Press the Settings button on your Magic Remote, navigate to General → Devices → HDMI Settings → SimpLink (HDMI-CEC). Toggle the setting to On if it's disabled.

Enable Auto Power Sync: Within the same SimpLink menu, ensure "Auto Power Sync" is activated. This allows your LG OLED B3 to turn connected devices on and off simultaneously.

Verify Device-Specific CEC: Check that your connected device (soundbar, Blu-ray player, gaming console) also has CEC enabled. On Samsung devices this is Anynet+, on Sony it's BRAVIA Sync, and on Panasonic it's VIERA Link. Names vary by manufacturer.

Resolve Connection and Power Issues

Physical connections and power states frequently cause LG OLED B3 HDMI CEC not working situations. These steps address the most common hardware-related failures.

Test Different HDMI Ports: Connect your device to a different HDMI port on the LG OLED B3. Port 2 (eARC/ARC) sometimes handles CEC differently than standard ports. Test each port individually.

Use Certified High-Speed HDMI Cables: Replace older or damaged HDMI cables with certified Premium High Speed or Ultra High Speed HDMI cables. Poor-quality cables may carry video and audio but fail to transmit CEC control signals reliably.

Power Cycle All Devices Completely: Unplug your LG OLED B3 and all connected HDMI devices from power for at least 60 seconds. Plug the TV in first, wait for full boot, then reconnect other devices in sequence. This clears temporary CEC handshake errors.

Warning: Do not use HDMI splitters, switches, or cheap adapters between your LG OLED B3 and CEC-enabled devices. These often strip or block CEC signals entirely, making SimpLink non-functional regardless of settings.

Update Firmware and Reset Configurations

Software bugs in older firmware versions can disrupt HDMI CEC communication. Keeping your TV updated ensures compatibility with newer devices and patches known CEC issues.

Install Latest LG Firmware: Go to Settings → Support → Software Update → Check for Updates. Download and install any available updates, then restart the TV. Test CEC functionality before reconnecting all devices.

Reset SimpLink Connections: Navigate to Settings → General → Devices → HDMI Settings → SimpLink Device List. Remove all listed devices, then physically disconnect and reconnect each one to force fresh CEC pairing.

Perform Soundbar/Receiver-Specific Setup: If using an eARC soundbar or AV receiver, connect it specifically to HDMI 2 (eARC/ARC). Enable eARC in Settings → Sound → Sound Out → HDMI eARC Support. Some devices require eARC enabled for CEC to function at all.

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Frequently Asked Questions

Why did SimpLink stop working after a firmware update on my LG OLED B3?

LG occasionally resets user preferences during major firmware updates. Navigate back to Settings → General → Devices → HDMI Settings → SimpLink and re-enable it. Also check that "Auto Power Sync" remains activated, as this setting sometimes reverts independently.

Can I use HDMI CEC and eARC simultaneously on the LG OLED B3?

Yes, the LG OLED B3 supports both eARC and CEC on HDMI 2. However, some older soundbars have buggy CEC implementations that conflict with eARC. If you experience issues, try disabling eARC temporarily to isolate whether the problem is CEC-specific or eARC-related.

Why does my PlayStation 5 or Xbox Series X not respond to SimpLink commands?

Gaming consoles often have CEC disabled by default for power management reasons. On PS5, go to Settings → System → HDMI → Enable HDMI Device Link. On Xbox Series X, navigate to Settings → General → TV & Display Options → Device Control → HDMI-CEC. Even when enabled, some console features like instant-on modes can interfere with proper CEC standby behavior.