Composite Video incompatible with standard A/V?

[Sydney2K]

I have a problem where it seems as if the component video is interfering with the standard video into my TV. I use a Powerwave AV Control box to connect my various AV equipment into my Tevion 66cm widescreen TV. The setup is below. The first two input ports are equipped with component video plugs, so naturally I have plugged my DVD player/recorder into those ports, and my SD digital set top box into one of the others. I've also plugged the DVD units into the standard AV plugs for each port as well.

The output ports are equipped with both component video and standard AV plugs. I've plugged the control box into one of the TV's standard AV plugs, but when I try and plug the component video into the TV's component video plugs the image on the TV is jerky, both in standard AV mode and DVD mode on the TV. Removing the component video fixes the problem. (I will also mention that I get a fuzzy monochrome image of whatever the control box is switched to in TV DVD mode.)

Now I assume that the control box doesn't mix video together, so component video in is component video out, and standard AV in is standard AV out. I aso assume that my TV DVD mode is to be used with component TV. Why then should the component video interfere with the digital set top box video? Any suggestions or solutions?

Control box setup.

AV Input Port 1
DVD Recorder
Standard RCA AV -> A to 5.1
Component

AV Input Port 2
DVD Player
Standard RCA AV
Component

AV Input Port 3
SD Digital Set Top Box
Scart to Standard RCA AV

AV Input Port 4
CD Player/Tuner
Standard RCA A

AV Input Port 5
Unused

AV Output Port
RCA Audio to 2.1
RCA Video to TV
Component disconnected

All ports are S-Video capable

[jokiin]

Are you confusing Composite with Component? You mention stanard AV, are you referring to a yellow AV connection (this is composite), just trying to clarify what connections types you are referring to here.

[Sydney2K]

Yes, I meant component not composite. My mistake. The connections I am referring to are the Red/Green/Blue plugs, not the Yellow (what I refer as the standard AV plug.)

[andw]

Are all your ports labelled separately?
One of my screens has multiple inputs like that, but the inputs are shared.
(i.e. composite AV1 and AV2 inputs and Component YPbPr1&2 have seperate plugs, but you can only use one or the other, not both)

[Sydney2K]

No, there's two seperate rows of input plugs, one row for the standard AV plugs and one for the component video plugs for each of the input sets that have component plugs.