47LW570s 3D from HDMI

[DELLmanCze]

Hello

I want to setup Side by Side 3D (through 3D button) , but i have it grayed..
(this is only when signal comes from external device and only valid option is 2D-->3D conversion)

So how can i "Ungray" it ?

Thanks Joseph

 

[celsius]

What is the source (file), player (which media player/BD player) and connection to TV (HDMI)?

Are you playing it from PC?