Need help connecting my ps3 - dvd receiver - projector.

Hi,

I'm trying to connect my ps3 - dvd receiver - projector.



ps3 fat







Dvd receiver: LG HT502PH-AM together with the LG 5.1 sound system. This one: www.lg.com/my/support/support-product/lg-HT502PH-AM. It still works perfectly, playing DVD and stuff.



projector: well a fairy cheap one I'm embarrased to mention here, it has one HDMI port, AV port.etc. and built in sound system though.



First, I connect my ps3 to my projector through a HDMI cable, both the video and sound work perfectly (the sound comes from the built in sound system from projector)



However, I want to take advantage of my 5.1 sounnge the option from HDMI to the third option (AV blah blah, I dun remember, not the HDMI and not the optical one).



Problem is when I do that, there is no sound from my 5.1 sound system at all.



So did I do any steps wrong?



If not, what can it be? Would buying the optical cable work (I lost my original)?



Please help.

Thanks!



I didn't find the right solution from the Internet.



References:
 www.gamespot.com/forums/playstation-nation-1000002/need-help-connecting-my-ps3-dvd-receiver-projector-33421283/#5


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