Lcd&Touchscreen Board - Mindray BA-88A Service Manual

The temperature sensor outputs the voltage signal to the analogue board,
where it will go through amplification and modulation. Finally, it will be output
at the inputting end of the AD converter through selectable switch.
The AD converter receives control signal from the CPU extension board and
samples the processed photoelectric/temperature signal and sends the AD
value to CPU extension board for processing.
The power of the analogue board is provided by power board.
Figure 4-12 Structure of the analogue board
D12: ＋12V power indicator
D13: -12V power indicator
D14: +5.0V power indicator
4.7 LCD&Touchscreen Board
LCD&touchscreen board realizes the functions of LCD and touchscreen driver and
signal transmission.
LCD&touchscreen board receives the LCD display control/data signal which
is exported from CPU extension board and outputs the LCD display
control/data to LCD screen.
LCD&touchscreen board realizes the function of four-wire resistance
touchscreen AD collection. It receives the touchscreen control signal from the
CPU extension board and output the touchscreen data to CPU extension
board.
Figure 4-13 LCD&touchscreen structure
D6: ＋3.3V power indicator
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