Lenovo Displayport to HDMI on Sony TV

I bought a Cable Matters 10ft Displayport to HDMI cable to connect to my Sony TV which supports "Full HD 1080" video. We already have 2 of the HDMI ports used, so I used the one labeled #3 on the front of the tv.

When I plug it in to the computer, a Lenovo W520, it shows up as "Sony TV" and I can look at the settings in Nvidia control panel. It shows that it supports audio and has defaulted to the native 1920x1080p resolution.

But the TV just says "Video 3" in the corner and doesn't do anything. I have extended the displays and my mouse cursor can go into nowhere land, but nothing shows on the TV. Any ideas?

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I tried it on another TV and it is doing the same thing. It detects the TV, but this one says "No signal"

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Updated my drivers to the latest 207.45 and no change.

I've researched the crap out of this and the only thing I think it could be is the cable. Except why would it show me the TV type and resolutions and EDID data, but not transfer the video/audio?

Apparently the W520 is a DP++ which should be fine with a passive adapter aka a simple cable.

 

Have you tried another cable or a DP to HDMI adapter + a standard HDMI cable?

I've tried the same thing with a T420 with the Intel IGP and it was directly plug and play. Aside from that, make sure the output is one your TV supports as in refresh rate and NTSC or PAL, although i'm not entirely certain that's relevant with current HDTVs.

 

No, I haven't tried another cable since I don't have one to try. BTW this is the exact cable I have: Amazon.com: Cable Matters Gold Plated Premium DisplayPort to HDMI Male to Male Cable in Black 10 ft: Electronics

I tried changing the output to 1080i, 1080p, 60Hz, 59Hz, and yet it would change itself back to 1080p; 1920x1080 60Hz (Native) automatically.

 

Any other ideas for something I could try before returning the cable?

 

Try one of your other existing (known/good) cables with your notebook on the Video 3 port of your TV.

I also suspect that the input should be labeled HDMI 3 too... are you sure you've tried all the inputs on the TV while the notebook is connected?

While it could be the cable (easily) I would exhaust ALL possible scenarios first - especially as you have two other cables to play with.

Good luck.

 

Well the thing is I tried it on two TV's with the same result. I do not have another Displayport>HDMI cable, so I can't really try any other combinations. The only other thing I could try is plugging the cable box HDMI into Video 3 or something just to verify the port works.

It's just weird that the TV sees a device connected, and the computer recognizes the TV, but its just a No Signal screen. One TV says Video 3 with a standard blue background, and the other says No Signal.