Solution for “Sub-health” HDMI Signals: Magewell Mini Repeater HDMI 4K

When using Magewell capture devices, we sometimes encounter a problem. After connecting the HDMI video source with the capture device directly, the screen shows "No signal" or "Unsupported signal". This problem is especially prone to occur when the HDMI cable is long. The root cause of this is that the signal output by the HDMI video source is non-standard or the standard HDMI signal becomes non-standard after a long distance transmission loss. We also found that 4K HDMI signals have more stringent requirements on transmission cables. To solve this problem, Magewell introduced Mini Repeater HDMI 4K, which can fix the corrupted signal at the receiving end, or generate a better signal at the sending end so that the user can capture the image correctly.

How to Use:

  1. Connect the input end of the repeater to the HDMI signal source, and the output end to Magewell capture card. Then the signal can be captured normally.
  2. If the signal still cannot be captured normally at this time, a 5V power supply can be provided to the repeater to improve its working performance.
  3. If the problem persists, the signal is seriously corrupted and can't be fixed.

Note that other factors that may cause the same problem need to be excluded before attempting to use the repeater.

  1. Check if the signal source is encrypted by HDCP because HDCP signals are not allowed to be captured.
  2. Check if the signal source is corrupted. Connect the signal source to a monitor and check whether it can work normally.
  3. Check if the capture device is damaged. Use a PC as the signal source and connect it to the capture card, check whether it can work normally.