I dont know about your particular hd hookup , but I take the hdmi cable out of my dish reciever/dvr [digital video recorder] and run it straight to the hdmi input #2 in the back of my apex 40 in lcd-hd-tv
I think take the hdmi output from the at&t u-verse cable box and plug it into the hdmi input of your 70 in sharp smart tv
that will get the input signal from your cable box ,both video & audio, into your tv set.
on the back of your tv set
there should be audio outputs for home theater audio systems that would plug into the audio inputs of the home theater system.
prehaps i am wrong because you say that your yamaha is a home theater* reciever.* is the yahama more than a home theater audio system? What does it recieve?
Idea-- the salesman that you bought it from should be willing to help tell you how to hook it up.
also consider that there are many different ways to hook up vcr's and then dv recorders and dvd recorders and external 2 tera bite hard drives into my tv & dvr . I got that all hooked in & a rats nest of wires. so i can record in hd or sd,on vhs or dvd or dvr
point is that you cant hurt anything by plugging the wrong plug into the wrong jack, as long as the same type of plug goes into the same type of jack.
If its right,it works, if its wrong, it wont work until you plug it into the proper jack.
im sorry ,im 65 am not into knowing all the latest and greatest cutting edge tech ,but i am begining to catch up on my hobby, movie recording tech.
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