So I was recently staying in a hotel in Slough which has fairly decent LG TVs in the room.
I brought my chromecast and wanted to watch a film with wifi hotspot and local cast (android app).
The problem was the TV was restricted to certain inputs and one of those wasn’t Hdmi!
The TV has a “Power TV” box connected to it, this seemed to take control of everything on the TV.
After a bit of googling I came across a post which suggested turning the box off.
Well this worked, the problem was the TV physical buttons were locked. Luckily I had my HTC one with me which has a universal remote. So with this I could change to hdmi. Films ensued.