Display and backlight constraints
The GT1050-QBBD-C is a 5.7" STN monochrome (white/blue, 16 scales) HMI from the Mitsubishi GOT1000 family. Resolution is 320 x 240 dots in horizontal format. The backlight is a cold cathode fluorescent tube (CCFL) and is not user-replaceable — when it dims or fails, the unit is a service exchange. A backlight shutoff detection function is included, and the off/screen-saving timer is configurable. This matters for a line-down spare: if your panel runs 24/7, the CCFL has a finite life, and there is no field-replacement bulb.
