When the power is removed and then restored there is a "discovery" period in which the vehicle goes out and polls for all of the i-bus devices that are installed. Likely what happened is when you restored power the first time is the video module didn't respond with the proper "I'm here" sequence and therefore it didn't show up on your screen as an available module. As you discovered, removing the power and then restoring it cleared the glitch and the TV module got the proper handshake with the i-bus.

Glad all worked out.

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