I have another Viewsonic G810 that is maxed out according to the OSD control for brightness but needs more. This was recently purchased as a factory refurb (maybe a mistake). There should be a brightness master control on the main logic board shouldn't there? If anyone knows about where it would be, please post back. Thanks

There is usually a brightness control on the Flyback. Be careful with this control though. A very small turn can make a big difference. You could damage something if you turn this control too much !!