I'm currently in the process of mounting a D9200 in my Taito Egret cabinet. Due to space constraints I'm not going to be able to use the metal frame that comes with the monitor. I'll have to mount the chassis PCB somewhere in the rear. My question is: do I have to make sure the metal 'tray' the PCB sits in is connected to the metal part of the CRT frame? If proper operation requires this be the case I want to know before I kill myself