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Theory of Operation
3–2
WFM 90 and WFM 91 Service Manual
The Backlight Power Supply board uses the switched DC input voltage from the
batteries or external DC input to generate the voltage for the display backlight.
The backlight mounts into the display module.
The LCD Display module generates the display graphics using input signals
generated on the Top and Bottom boards. The power for the LCD Display
module comes from the Bottom board, while the power for the backlight comes
from the Backlight Power Supply board. The display backlight mounts into the
side of the LCD Display module.
Backlight Power Supply
Board
LCD Display and
Backlight