Originally Posted by mdavej
Most definitely the wrong cable. You are shorting the audio and video. The third band separates them. The screeching you hear is the video signal on the audio line. I'm surprised you haven't permanently damaged your Tivo.
Yeah, the 3.5mm jacks are TRRS (Tip, Ring, Ring, Sleeve) for the composite video adapter with the Tip being Video (goes to Yellow RCA), Ring (Left Audio), Ring (Right Audio), Sleeve (Ground)
While a 3.5mm to RCA Audio cable which he's using is a TRS (Tip, Ring, Sleeve) with the Tip being Left Audio, Ring (Right Audio), and Sleeve (Ground)
So the Mini's Video is connecting to the Left Audio RCA plug, the Mini's Left Audio is connecting the Right Audio RCA Plug, and the Tivo Mini's Right Audio is being shorted to Ground
as the 2nd ring is now on the sleeve which is also connected to ground.