So here is the summary I'll do the changes & let you know.
*Add an electrolytic cap 100uF on 5V side of the 7805
*Add a 1K resistor from the Enable line to GND on the LCD
*Tristate the LCD data & control pins after sending data
*Cut the GND track from the PCB & connect to 24V supply GND
*Add an electrolytic cap 100uF on 5V side of the 7805
*Add a 1K resistor from the Enable line to GND on the LCD
*Tristate the LCD data & control pins after sending data
*Cut the GND track from the PCB & connect to 24V supply GND
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