Samsungs do not have a G2 or sub brightness control so unless you intend to modify the circuit or check for a fault you are wasting your time taking the cover off, they are set up using software called softjig and a hardware interface.
http://www.eserviceinfo.com/equipment_mfg/SAMSUNG+softjig+and+interface.rar_3.html
There are hidden plastic retaining clips between the two halves. I usually place the monitor face down on some foam rubber and then place one arm around the cabinet rear and lift the whole unit about 1 inch from the foam rubber then you can go round hitting the case with the other hand.
This will usually shock the clips apart.
Rich B