Main Pcb; Display Pcb - LG GR-J303UG Series Service Manual

3-2-11. COMMUNICATION CIRCUIT BETWEEN MAIN PCB AND DISPLAY PCB
Following circuits as communication circuits are circuits for changing necessary information between the main MICOM of
the main PCB and the MICOM for LED control of the display PCB.
DC12V for driving the display PCB, transmit/receive circuits are required.
Poor communication occurs where continuing information change between the main MICOM of the main PCB and the
MICOM for LED control of the display PCB is not done for more than 30 seconds.

MAIN PCB

DISPLAY PCB

DC 12V
MICOM for
MAIN MICOM
LED Control
GND
Transmit (error status)
Receive (notch status)
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