HDMI 6670 connection ok - but no output signal

Hello,

I would like ask for Radeon 6670.

I need to connect ho UHD TV Samsung 7002 from Graphic Card HDMI port.

 

When I connect cable, PC has recognized him - in Screen resolution Detect - Samsung - multiple monitors it seems ok.

TV has also  recognized input cable, but no input signal.  When I connect same cable to Notebook- all is ok - so cable ist good.

I have Win7 64 bit . In AMD catalist centre for settings My Digital Flat panels: maximum resolution 1920 x 1080(UHD is not working for 6670 of course), refresh rate 75 Hz , maintain aspect ratio.

 

Maybe  I need add  any HDTV mode?

Thanks

Vlado