Brian, if you have a multimeter, you could check to see if you have power (3.3V) on C9000 and a few other components that are part of the backlight control support. The circuitry is ensuring that the backlight is only on when your Panel receives valid video. Let us know when and if you find the time:-) we all know difficult that is. Also, it appears as if the switch was for development only. It was planned to use a NTC020-CC1J-B260T switch. If you post an image of your board we could possibly see which points would have to be closed to reset the SMC. Of course, you already tried the conventional way as outlined in the manual