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What is an Input Signal Out of Range?

Published in Display Technology 3 mins read

An "input signal out of range" error typically indicates that the resolution or refresh rate being sent by a device (like a computer or gaming console) is not supported by the receiving display (like a monitor or TV). In simpler terms, the signal the device is trying to show is incompatible with what the display can handle.

Understanding the Issue

This problem usually arises because:

  • Resolution Mismatch: The output resolution of the source device exceeds the maximum resolution supported by the display. For example, a computer set to output 4K (3840x2160) resolution connected to a monitor that only supports 1080p (1920x1080) resolution.
  • Refresh Rate Incompatibility: The refresh rate (measured in Hz) being sent is too high for the display. A monitor might only support a 60Hz refresh rate, but the computer is sending a signal at 144Hz.
  • Unsupported Signal Type: The device might be sending a signal format that the display doesn't understand. This is less common but can occur with older or specialized display technologies.

Troubleshooting Steps

Here's how to resolve an "input signal out of range" error:

  1. Restart the Source Device and Display: A simple reboot can sometimes clear temporary glitches.

  2. Lower the Resolution:

    • If possible, connect the device to a different monitor or TV known to work.
    • Reduce the resolution settings on the source device (e.g., in your computer's display settings) to a lower value like 1024x768 or 800x600.
    • Then, connect it back to the original display and gradually increase the resolution until you find one that works.

  3. Adjust the Refresh Rate:

    • Similar to the resolution, lower the refresh rate (e.g., to 60Hz) in the display settings of your device.

  4. Check Cable Connections:

    • Ensure the cable connecting the devices (HDMI, DisplayPort, VGA, etc.) is securely plugged in and undamaged.
    • Try using a different cable to rule out a faulty cable.

  5. Update Graphics Drivers (for Computers):

    • Outdated or corrupted graphics drivers can cause display issues. Update them to the latest version.

  6. Consult Device Manuals:

    • Refer to the manuals for both the source device and the display for specific compatibility information and troubleshooting tips.

  7. Safe Mode (for Computers):

    • Boot your computer in Safe Mode. This uses basic drivers and may allow you to adjust display settings.

Example Scenario

Imagine you've connected a new gaming PC to an older monitor. You turn on the PC, but the monitor displays "Input Signal Out of Range." This likely means the PC's default resolution or refresh rate is too high for the monitor to handle. You'd need to connect the PC to a different, compatible display to lower the resolution settings before connecting it back to the original monitor.

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