Yes, outside it is noname. But just open it.... on the panel there are singing numbers and identifyers
The power and GND are quite easy, because usually the largest metal part is GND (the metal housing of the LCD, for example). Power is very often protected by a fuse (white, small smd brick, amperage is on the surface and marked as F1 on the pcb). It is possible that it is also filtered by a ferrite.
First you have to determine, what is the system of the video. Inside the monitor, on the PCB there are white labels, eg. +12V, GND or so. Read them.
Search especially for those small silver metal discs that are not covered by that insulatory green resin.