Troubleshooting common issues with your CommBox Intelligent Display

Applies To
Applies to: CommBox Intelligent Display (all sizes and models)

Step-by-Step Instructions

Step 1: If your CommBox display won’t turn on or has no picture/sound

• Check that the unit is powered on — look for indicator lights.

• Confirm all signal cables (HDMI, VGA, etc.) are securely connected.

• Make sure the correct input source is selected (e.g., HDMI).

• If you're using the internal PC, ensure it’s also switched on

Step 2: If the image shows but there's no sound

• Make sure the system isn’t muted.

• Adjust the volume using the VOL + / - buttons.

• Confirm the audio cable is plugged in properly

Step 3: If the image appears distorted or has incorrect colours

• Adjust brightness, contrast or chromaticity in the display’s menu settings.

• Double-check the video signal cable is connected properly.

• If using VGA, fine-tune the clock and phase in the menu

Step 4: If there’s no response from the remote control

• Remove any objects blocking the signal between the remote and the screen.

• Check battery placement; the “+” and “–” symbols must align correctly.

• Replace the batteries if needed

Step 5: If the screen shuts off automatically

• Check if Sleep Mode is enabled.

• Look for signs of recent power outages.

• If the display loses signal from an external source for 5 minutes, it will shut down automatically — make sure the signal source is active and correctly connected

Step 6: If the image has lines or is flickering

• Select ‘Automatic Correction’ in the menu.

• Adjust clock and phase manually if needed.

• Ensure VGA cable is secure and undamaged