Sony DVD units require a little understanding. Refering to Sony manual (http://baileyswholesale.com/prodpdf/...NERSMANUAL.pdf
) pdf page 11 (manual page 10) please note that if Progressive Video (pdf page 9; Item 26) is selected for output, there is no output from the composite video connector (pdf page 9; Item 19). Make sure both TV and Sony unit are setup to use the same video cable path. You will have to dig deep into TV and DVD user manual setup information to deduce this.
However, here is the rub. The audio output from the DVD (Pdf page 9; Item 25) is used for all DVD video outputs. Many TV's have a combined Video/Audio inputs for each video channel (not shared). May force you to use the DVD Surround Sound for audio since the DVD audio is not seen by the TV.