Using onscreen LCD display and Marshall HDMI monitor?

[rj32]

Hi, can anyone help me with figuring out how can I use both the onscreen LCD display on the camera (Canon T5i) and my new Marshall monitor at the same time? 

Thanks for your help.

RJ32

[Datadogie]

Can't be done. Android tablet with DSLR controller can.
http://www.youtube.com/watch?v=pcKykAW4U84&sns=em