Hi,
just did a repair of a 30" myself. The correct layout is
Pins 1,2,3,4,5
|+24.5VDC|GND|SENSE|GNDC|+24.5VDC|
|+24.5VDC|GND|SENSE|GND|+24.5VDC|
Pins 6,7,8,9,10
The wires are red für +24.5V, black for GND and grey for sensing.
It also works with 24V. If you try another power supply and cut off the plug, I would not recommend to connect the shield with the black GND cable. The grey wire is completely useless, it only helps to prevent the bigger ACDs from being switched on with a power supply for the smaller ACDs. So do not connect it to +5V or anything else - just leave it unconnected.