A "No Signal" message means the display isn’t receiving a valid video signal from the source. This can be caused by several factors, such as incorrect input selection, incompatible video settings, a defective connector, issues in the signal chain, or faulty cabling. Depending on the setup, multiple components (switches, converters, extenders) may be involved, so it’s important to systematically check where the interruption occurs.
By following the steps below in order, the problem can usually be located and resolved quickly and efficiently.
1. Check the input selection
- Make sure the correct input is selected on the display.
- An incorrect input selection is a common cause of “no signal”.
- In environments with multiple sources or matrix switches, the input may have changed unnoticed.
2. Check the source settings
- Confirm that the source is active and outputting a signal. If necessary, test this on another display.
- Check the output settings: resolution, refresh rate, and signal format must match the supported specifications of the Beetronics display.
- Incorrect settings, such as choosing a resolution that is too high or a frequency the display does not support, will result in an immediate loss of signal.
3. Inspect the signal chain
- Map the complete route from source to display: directly or via splitters, converters or extenders.
- Connect the source directly to the display to rule out external devices.
- Check whether any adapters or converters used are compatible with the desired signal type (for example, digital-to-analog conversion requires an active converter).
- Note for USB-C: both the source and the cable must support DisplayPort Alt Mode. Not every USB-C port or cable is suitable for video transmission.
4. Check wiring and connections
- Ensure all cables are connected correctly and securely.
- Please note the maximum cable length for the signal type being used. Excessive cable length or poor cable quality can lead to loss or instability. An overview of the maximum recommended cable lengths per connection can be found here.
- Test with an alternate cable to rule out cable defects.
5. Perform exclusion steps
- Test the display with a different source.
- Test the source on another display.
- If available, use an alternative input port.
6. Restart and handshake
- After all connections have been checked, restart both the source and the display.
- With digital connections (such as HDMI or DisplayPort), a new handshake may be required to properly initialize the signal.



















