Sound but no picture

Is input source set correctly? These recievers need to be set up correctly when installing. Set input to component, hdmi, whatever you are using...check connections at back check that audio is coming from Cable ot sat box,,,by inserting in into CD line in or a similar input..

Try a new HDMI cable.

These parts come from yamaha so you will just have to wait, sorry. They get replaced commonly. Larry's Electronics.

You cannot run HDMI from any source thru the Yamaha to the TV. The V661 is 1st generation HDMI headache. Version 1.1 which basically is useless. Don't blame Yamaha, it's not their fault, it's HDMI. All manufacturer's receivers prior to 09' series use either 1.1, 1.2, or 1.2a. and they all have issues. So, here's the skinny, run your audio to your receiver via optical or digital coaxial. Then run video directly to the TV via HDMI if you wish. The problem arises when you have more sources than inputs on your TV. Depending on the size of your TV can make a big difference in how you wire it. If your TV is 50" or smaller, just use component, the human eye cannot differentiate between 720p and 1080p and that's a fact. second fact, most TV shows are broadcast in a native resolution of 720p, the only real 1080p programming is on HDNET, Discovery,National Geographic and The NFL.
What I mean by that is the camera used to take the actual picture is a 1080p camera. Major money! so, that being said, if your tv is larger than 50", and it's 1080p not 1080i yes, you can see a difference. If you post a comment and list all your product, I can give you the best possible way to put it all together. I feel your pain and aggrivation! I am a Yamaha, Marantz, Proceed, and Adcom Dealer. I get it from all sides! If there's anyway I can make it easier for you, I will. Hope this helps

Connect to your HDMI out from the receiver to your television.

For the setup functions you have to use either the monitor out (a yellow jack on the top-right corner of the back) or you have to use component video out. HDMI will NOT work for setting up the system. This is one complaint to Yamaha from all of us.

hi i had similar problem, you need to change the settings in the bluray player output to hdmi or auto in other to get sound after the settings turn everything off even from the socket and then turn it back on for that setting to take effect. try this

Yes, the firmware on your hdtv box has an old firmware, I switched my old hdtv box with a newer one box and the problem was solved. It seems that it can't work if your hooking up with DVI to HDMI cable to your receiver to tv. Your hd box must have an HDMI out otherwise it causes problems. I also have rx-v661 and i finally hooked up everything HDMI to the receiver and then to the tv and it was having the problem you speak of. After I switched out the hd box for a newer one everthing worked fine.

cheak the out put on the cable box setting hdtv out put is it at 1080 i try 720 p ok

you need to assighn the input for the component video page 78 of your manual will explain how