Figure 5: Toggling on LCD_RW
Figure 6: Toggling on data line
After determining the issue to be with a pin on the microcontroller U706, care must be
taken to remove the LCD and identify the issue. Most likely there will be an unsoldered
pin or shorted pins on the micro. There is a smaller chance there could be a broken path
between the pins on the micro and the LCD header. The layout of the U706 is shown in
Figure 7, below. A portion of the schematic around U706 is also provided for reference
in Figure 8, below. U706 is a 64 pin LQFP.
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