Would this work for 2 way AV ports?

[BtheDestroyer]

I wanted to do a special design with my AV ports and wanted to know if this would work or if it would just fry the screen and console:

EDIT:Here's a better design:

I want the video and audio ports to give output when the console is on, but they can be used as an input for the screen/speakers if the console is off.

 

[Prog]

There are several issues with your design. I'm not an expert but there's one that's easy to spot: composite video syncs via a negative voltage spike. Your diode will block this.
I'm not an engineer but I'm pretty sure that you've also built a couple amplifiers that will make a severe feedback loop in addition to shorting out or partially inverting the video signal. Feedback loops are bad and could blow flax up.

 

[BtheDestroyer]

Blech. I'll probably just use a physical switch then...

 

[Prog]

You could also use relays or certain types of MOSFETs but I'm not sure about weight and stuff... is there an EE that can step in here?