does anybody know if something inside the drone will fry if i power it on without a camera connected?
Yes you can fry the cord and or the main board if you ever have the phantom powered on and some how short the tip of the plug to any of the other conductors in the plug. Such as wet grass or metal such as a work bench or some thing on the bench. also if you unplug the camera with power on that wire you can fry the camrea and or the cable and or your main board.
That cable Carry straight up power from the battery and when shorted is drawing way more amps then the wire and the circuit on the board can carry be for some thing frys. mine shorted once for a fraction of a second when I was working on my phantom and moved it on my counter and the plug end brushed up against a tool on the kitchen counter. OPPS. it melted on of the pins on the connector that is on the board right off from were it is soldered to the board. and it also fried some doodad right next to that plug which I dont know if its a resistor or a diode bit it fried it pretty good. It was turned to black crusty charcoal. I had to use a pcs of silver wire to remake a new leg and pin for the plug and replace what ever the doodad component thingy was by stealing the same unused do hickey from a spot on the board were there was the same thing going to an unused plug that said fan. on the back side of the board. and I re soldered it were the burnt one used to be.
So if every flying with out the camera plugged In I would make sure to not have that wire dangling down and tuck it out of the way some place like one of the holes in the shock mounts or some thing just to be one the extra safe side in case you land on any grass with any dew on it or what every.