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How to Turn Your TV and HDMI Devices On and Off Together

Troubleshooting LIFESTYLE SCREENS, TVs 08/09/2026

To turn your TV and an HDMI-connected device, such as a set-top box or soundbar, on or off together, set Simplink (HDMI-CEC) or Auto Power Sync to On in your TV settings.

Why Do your TV and HDMI Device Turn On Separately?

  • When you enable CEC (Consumer Electronics Control), devices connected through HDMI can exchange power control signals and turn on or off together.
  • Your TV and external device operate independently by default, so they do not share power control signals unless HDMI-CEC is enabled.

How to Enable Simplink (HDMI-CEC) or Auto Power Sync

Step 1. Turn On Simplink (HDMI-CEC) or Auto Power Sync

How to Check Your TV’s webOS Version

On your TV remote, press the [Settings] button, shown as a gear icon, or the [Mute] button three times in a row.

  • 2026 and later TVs (webOS 26 and later): Press the Settings button on your remote, then select All Settings, System, Devices, HDMI Settings, and Simplink (HDMI-CEC). Set it to On.
  • 2022 and later TVs (webOS 22 and later): Press the Settings button on your remote, then select All Settings, General, Devices, HDMI Settings, and Simplink (HDMI-CEC). Set it to On.
  • 2021 TVs (webOS 6.0): Press the Settings button on your remote, then select All Settings, General, Devices, HDMI Settings, and Simplink (HDMI-CEC). Set it to On.
  • 2019 and later TVs (webOS 4.5 and later): Press the Settings button on your remote, then select All Settings, Connection, and HDMI Device Settings. Set both Auto Power Sync and Simplink (HDMI-CEC) to On.
  • 2018 and earlier TVs (webOS 4.0 and earlier): Press the Settings button on your remote, then select All Settings and General. Set both Simplink (HDMI-CEC) and Auto Power Sync to On.
  • On webOS 6.0 and later, Auto Power Sync does not appear as a separate setting. TurningF on Simplink (HDMI-CEC) automatically enables linked power control.

Step 2. Still need help?

If the issue persists after following the steps above, you can get further support through LG Chatbot on our website or by requesting a technician visit.

FAQ

Q. What is Simplink (HDMI-CEC)?
A. Simplink allows you to control compatible HDMI-connected devices using a single remote control.
You can turn devices on or off and control functions such as the volume.
Q. Can I Use Simplink With Any Device?
A. Check your external device for the Simplink logo. Simplink works only with devices that display this logo.
Make sure you use a high-speed HDMI cable that supports CEC (Consumer Electronics Control).
High-speed HDMI cables use pin 13 to exchange control signals between connected devices.

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This guide is based on standard models. The settings menu may vary by model.

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