Some of the cable boxes, especially Motorola's, are hyper-sensitive to HDCP issues. The slightest glitch causes them to force a new handshake. Sometimes, they have been known to cut the resolution to 720p or even 480p, without telling you.
Comcast repairman figured it out. He came out to replace the DVR box but first he looked at how the cables were connected. He found the HDMI from the DVR going to the amp and another from the amp to the TV.
He change confiuration so the HDMI goes from the DVR directly to the TV. The speed of changing the channels improved and no "no input signal" flashes on the screen any more went changing channels.
PROBLEM SOLVED!!! Comcast repairman solved the problem.
sounds like a HDMI handshake issue. I believe it is displaying dvi....digital video interface....this is normal. I should say it's normal for that to display for a moment when turning on your TV if the box is already on. Then once the HDMI connection is made it should go away and display the time or TV channel you are on. Sounds like it keeps losing the HDMI connection multiple times for some reason.
I guess it could be the box or could be the TV. Not sure if component cables are an option with your current setup but that could be a short term solution until you get a different box. If it was me i would veriffy the HDMI input on the TV as well as the HDMI cable used by hooking it to another device like bluray player or something. Maybe if you have a different box in the home you could try it in place of your current box to see if it is the box. Then you could replace that box with a new one if it turns out to be the box...
The DUI (it's actually trying to say DVI, which is the predecessor connector to HDMI) means it is doing an HDCP (HD Copy Protection) handshake. The handshake sets up encryption keys since the data is scrambled to prevent copying.
Is the cable box directly connected to the TV, or going through a receiver?
TV goes dark and DVR flashes dul. Flashes picture no sound and goes dark and DVR flashes dul. This happens for 3 to 5 times when turning on TV and DVR. ALSO, will happen during a broadcast with NO contact with the remote. Happened during the 49er game on 01/15 all while everyone was enjoying the game at my house. We may not have a party this Sunday 01/22 if this is not fixed.