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Chapter 2--The LCD Panel Voltage Jumper
The board voltage and the LCD voltage are 2 different parameters. The board can be
worked from +5V to +12V. The LCD voltage only can be supplied by the board’s
jumper with only +3.3V +5.0V +12.0V. Most of LCD panel works at +3.3V. Normally,
the board’s jumper has been jumped to +3.3V and please don’t jump it again. Or else,
the LCD will be damaged at +5.0V/+12.0V.