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CEC Troubleshooting

Last updated: Nov 04, 2026

Overview

Follow these checks when CEC commands fail or work intermittently. Change one item at a time and retest. For display control, check the connected Decoder; for source control, check the connected Encoder.

Model and Firmware Compatibility

Confirm that the Just Add Power model, firmware, and operating mode support CEC. See CEC Compatibility, especially for 2G Series devices and devices operating in 2G Legacy Mode. If updating firmware, use a release compatible with the device and the rest of the system.

Display or Source Settings

Enable CEC on the display or source, including any separate power, input-switching, or standby-control settings. CEC may be named Anynet+, SIMPLINK, BRAVIA Sync, or VIERA Link.

Confirm with the manufacturer that the exact model supports the requested function. Test power on, power off, and input selection separately.

Just Add Power CEC Settings

On supported Omega Series, Ultra Series, and MaxColor Series webUI versions, open Comms > CEC Settings, turn on CEC Enabled, then select Apply > Save > Reboot. For older firmware or 2G Legacy Mode, use the settings procedure applicable to that model and firmware.

Check the device connected to the endpoint you want to control. Native CEC does not pass through from an Encoder to a Decoder.

HDMI Port and Cable

  1. Reseat the HDMI cable at both ends.
  2. Try a short HDMI cable known to work with CEC, even if the original cable passes video.
  3. Try another HDMI input on the TV. Recheck its CEC settings and adjust any input-selection command to match the new port.
  4. Connect the Decoder directly to the display, bypassing AVRs, soundbars, adapters, and other HDMI equipment.
  5. Disconnect other HDMI devices from the display. If control returns, reconnect them one at a time to identify the cause.

CEC Commands

On supported webUI versions, test power commands from Comms > CEC Commands. Use CEC over IP Control to verify command syntax and settings.

If direct commands work but control-system commands fail, check the destination device IP address, network access from the control processor, driver settings, and command timing.

Responses After Idle Time

Some endpoints miss the first command after a long idle period. For an intermittent power-off response, test this sequence:

  1. Send the HDMI input command: \xEF\x82\x10\xF0.
  2. Wait 200 ms.
  3. Send the power-off command: \xE0\x36.

Use the syntax required by your control interface and input bytes appropriate to the connection. For advanced behavior options and their firmware requirements, see CEC Mode Behavior Modification.

Compare with a Working Device

Test the affected display with a known-working compatible Decoder and HDMI cable, or test the affected Decoder with a working display. A problem that follows the display points to its settings, port, or CEC support; a problem that follows the Decoder points to its settings, firmware, or HDMI connection.

Samsung Black Video

If a Samsung display powers on but shows black video, follow Samsung Black Video After CEC/IP Power On.

Contact Technical Support

If the issue remains, submit a support request with the device and endpoint models, firmware versions, exact commands, HDMI connection details, and results of these tests.