DMG works just fine, but apparently I never ran it long enough to find out that it overheats if played for a while. I imagine this has something to do with unregulated powersourcing for the backlight, though I used the same solder points for the v3 indicated in the manual pdf. DMG overheats at the same place as in this thread: http://forum.modretro.com/viewtopic.php?f=40&t=9743 which happened to be the only overheating DMG discussion I could find.
alternate solder points for the backlight? unfortunately I already clipped the wires to size, they reach just under the lower LCD ribbon cable. One broke off during installation and I resoldered it easily, so maybe I have to do that again to make this work.