How to Fix a Motorola STB that shows "dU1", "dUl" or "dVI", or a Scientific Atlanta STB gives the HDCP error

Motorola cable box showing "dU1", "dUl" or "dVI"

These three codes are really meant to be "DVI", the others are just different ways I've seen come up on the cable box's front display, particularly since it doesn't look much like "DVI".

This error indicates the cable box wasn't able to set up a connection over the HDMI cable. Part of the HDMI interface is the requirement that the two devices using an HDMI cable "handshake" to verify that High Definition Copy Protection (HDCP) is active. If the "handshake" fails, the cable box will show this error and be unable to output to the TV over the HDMI cable.


Scientific Aatlanta cable box showing HDCP error

The error message is "DVI Alert - Your TV does not support HDCP. Please disconnect the HDMI connector and use the YPbPr connection to continue watching TV."

This error indicates the cable box wasn't able to set up a connection over the HDMI cable. Part of the HDMI interface is the requirement that the two devices using an HDMI cable "handshake" to verify that High Definition Copy Protection (HDCP) is active. If the "handshake" fails, the STB will show this error and be unable to output to the TV over the HDMI cable.

Primary Troubleshooting Steps


  • Make sure that the only cable connected from the cable box to the TV is the HDMI cable, remove others
  • Confirm that you have your TV set to its HDMI input or source.
  • Reseat the HDMI cable (either end, both if needed)
  • *Attn* - Powercycle the cable box. Be careful with this one, as Powercycles tend to cause the cable box to show picture for a few minutes then fall right back to the same error.
  • Change which HDMI port the HDMI cable is connected to on the TV. Most TVs with an HDMI input have more than one HDMI port...eg, HDMI-1, HDMI-2
  • Powercycle the TV



Alternative Troubleshooting Steps

  • Use Component cables or a DVI-to-HDMI cable instead of the HDMI cable
  • Replace the cable box.

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