NEC XG Series

      >> Introduction
      >> Layout and Setup Tips 
      >> XG Models and Production Run Dates
      >> Multi Default Frequencies IMMS
      >> Hidden Control Functions
      >> PC Control Cable Pinout & Software
      >> Lens Focus Fix (LC Units)
      >> Misconvergence During Switching Fix
      >> Compatibility of PC Control Versions
      >> Incorrect Lens Focus & Halos Fix
      >> Manuals / Downloads

The above picture is of one of three CRT sockets that attach to the backs of each CRT. I take these sockets off when I ship the XG projectors, as the weight of these neck boards can snap the tube envelopes. All three neck boards are the same, so it doesn’t matter which one goes on which tube. The exception is the green CRT socket, some models have a small fan attached to the green heat sink. When I sell these sets, I label each neck board as to which tubes they come from, as the gains of the boards do vary slightly, and for proper color balance, put the tube sockets back in the right order. However, if you have a bad socket or video board, you can interchange the boards without fear of blowing anything up.

Typically, a bad neck board causes low or no video output from that particular tube. When transferring wiring harnesses from socket to socket, ensure that you put all multi-pin connectors on the right way, and do not miss a pin. It is VERY IMPORTANT that the thicker red G2 wire gets connected to the right pin and is connected securely. A mis-connected or disconnected red wire will cause no brightness from that tube, but will cause a phosphor spot burn when the set is turned off. All other connectors are very straightforward.