"Onkyo TX-NR801 AV receiver using a coaxial digital cable but cannot get sound from the AV receiver." In onkyo amp, choose DVD, then in digital audio settings choose coax1. Then enter. In blu ray player, digital output selection choose auto or bitstream .
Is Yamaha HTR-640 a receiver? Try HDMI from PS3 to receiver or Sony HDTV. If HDMI from PS3 to receiver the you need and HDMI from receiver to out Sony HDTV. You could connect everything to receiver and HDMI out to HDTV. You can not have an HDMI cable AND an optical cable coming out of the PS3, only one or the other.
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