I have a DCT6412' s HDMI input driving a Sharp Aquos LC-37D6U directly.
When I change from a non-HD channel to an HD channel, the Sharp displays a message saying it's syncing, the status display says it's in 1080i mode, but the picture is not displayed correctly. You can only see the left 2/3 of the screen.
The only way I've found to get the screen to display properly in 1080i is to toggle the Input selector to some other source and back to the DCT6412. Then the HD picture is displayed full frame.
If I then switch to non-HD, it syncs correctly to 480p but fails to sync back to 1080i for an HD.
I've read this thread and I believe my DCT6412 settings are correct. I tried changing various settings on the DCT6412 and it didn't help syncing. The DCT is set to 16:9, 1080i, HDMI, YCC/RGB (had no effect).
I talked to Sharp and they are out of suggestions and want to do a home visit. They said HDMI should display full frame.
I talked to Comcast and they didn't have any more suggestions that were already
suggested on this thread. They did suggest connecting the component input. So I connected the DCT6412 component input directly to Sharp.
For some reason, the Sharp did not see the component input as being active. I swapped the component and DVD inputs on the Sharp and then I could see the component input. When I switched back and forth between non-HD and HD, the component input correctly synced between 480p and 1080i, unlike the HDMI input.
I was able to switch back and forth between component and HDMI inputs.
Strangely, the next day, the component input disappeared again and I haven't been able to get it back.
I seem to remember a thread which said the DCT6412 does not drive both the HDMI and component outputs simultaneously. Only one or the other. Is this true?
And how does the Sharp know the input is active or not. My DVD player is off but it still lets me select the DVD player but the component input is not selectable.
I would appreciate any advice before I have to pay Sharp to have a tech visit.