JLV3: LCD Backlight Inverter Power Select Jumper
Pin 1-2 Close: Inverter Power=5V
Pin 2-3 Close: Inverter Power=12V (Default)
JBLR1: Backlight PWM Signal Select Jumper
Pin 1-2 Close: Reverse
Pin 2-3 Close: Forward (Default)
14 | Chapter 2: Hardware installation