I recently changed the transmitter in my Massoth Navigator and now the screen backlight wont come on. I can change the settings in the Nav and the key backlights respond accordingly, but not the screen. It seems the LEDs are part of the screen assembly. I tried reconnecting the 2 pin socket from the screen to the board, but no luck. Anyone have any tricks for this? I was pretty careful when I removed the original transmitter and replaced it and everything appears to be in the proper place.