Basic Troubleshooting for CommBox Gen 2 LED Boards

Applies To
CommBox LED Board Gen 2 Elite & Ultra Series (120”, 138”, 150”, 165”, 180” models)

Step-by-Step Instructions

1. Part of the Screen Is Black After Power-On

   • Check all power and signal cables inside the affected cabinet(s).

   • Re-seat both power and signal cables firmly.

   • Power cycle the screen by turning it off and unplugging for 10 seconds before restarting.

2. No Indicator Light on the Power Button

   • Confirm that the main power cable is securely plugged into the wall and the LED board.

   • Check if the wall socket has power (try another device).

   • Verify that the rear power switch is turned ON (if present).

3. No Image on Display When Using HDMI Input

   • Confirm that you’ve selected the correct input source (Menu > Input Source).

   • Check HDMI cable connections on both the screen and external device.

   • Try a different HDMI cable or port to rule out cable or port issues.

   • Test with another source device (e.g. laptop) to isolate the issue.

4. LED Modules Show Mismatched Colours or Brightness

   • This may indicate a calibration data issue.

   • Follow the manual calibration readback procedure using LED Studio (see related article below).

5. No Sound from the LED Screen

   • Press the Volume Up button to ensure audio is not muted.

   • Go to Settings > General > Sound Output and confirm correct output device is selected.

   • If using external speakers, verify audio cable is connected correctly.

Troubleshooting / What to Do If It Doesn’t Work

• Still no power? Try a known working power cable or plug into a different GPO.

• Display image still missing? Try using a different input source (HDMI 1, HDMI 2, HDMI 3).

• Persistent issues with modules? You may need to reload calibration data via LED Studio.

• If problems continue, log a ticket on the Support Portal.