You need those's component cables if your on a HDTV, not only that, but the GBA player supports Pro-Scan.

S-Video on a HDTV!? Washed-out Blurr fest? The Big N should have released those's to the public ASAP! Ofcourse only 1% of Nintedo owners use theim, It's not like you can walk into Wal-Mart and buy the things :/