LG GR-P257 - PWB, Display, and Communication Circuits

1-12. Communication circuit and connection L/Wire between main PCB and display PCB
The following circuit is a communication circuit used for exchanging the necessary information between main MICOM of
main PCB and LCD dedicated MICOM for LCD control of display PCB.
Transmission/receipt L/Wire together with the necessary display PCB for driving the display PCB is required.
Poor communication occurs if a continuous information exchange fail to continue for more than 2 minutes between main
MICOM of main PCB and LCD dedicated MICOM for LCD control of display PCB.
1) GR-P257, L257, P217, L217
EXPLATION FOR MICOM CIRCUIT
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ROOM TEMP
°F
°C
JET FRZ
EXPRESS FRZ
OFF
ICEBEAM
DOOR COOLING
CUBE
WATER
FRZ TEMP REF TEMP
CRUSH
°F
°C
°F
°C
5
4
3
2
1
FILTER STATUS
6
5
4
3
2
1
FILTER RESET
HOLD 3 SECS
UNLOCK
LOCK
PCB ASSEMBLY DISPLAY
Main MICOM LCD dedicated MICOM
DC 12V
GND
Transmission (error status)
Reception (notch status)
Main PCB L/Wire FD/H(4-wires) Display PCB