LG LRSC26980TT Service Manual - Page 44

Communication circuit

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EXPLANATION FOR MICOM CIRCUIT 1-13. Communication circuit The following communication circuit is used for exchanging information between the main MICOM of the Main PCB and the dedicated MICOM of the LED (LCD) Display PCB. A bi-directional lead wire assembly between the two boards is required for the display to function properly. Poor communication occurs if a continuous information exchange fails to last more than 2 minutes between main MICOM of main PCB and LCD (LED) dedicated MICOM for LCD (LED) control of display PCB. Main PCB Main MICOM L/Wire FD/H(4-wires) DC 12V GND Transmission (error status) Reception (notch status) Display PCB LCD(LED) dedicated MICOM LRSC269**** PWB ASSEMBLY DISPLAY ICEBEAM COOLING OFF CUBE WATER CRUSH F 5 4 3 2 1 FILTER F MONTH F ROOM TEMP 3 SECS DISPENSER & KEY EXPRESS/JET FRZ DISPENSER FREEZER REFRIGERATOR FILTER/LIGHT LOOK - 44 -

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1-13. Communication circuit
The following communication circuit is used for exchanging information between the main MICOM of the Main PCB and the
dedicated MICOM of the LED (LCD) Display PCB.
A bi-directional lead wire assembly between the two boards is required for the display to function properly.
Poor communication occurs if a continuous information exchange fails to last more than 2 minutes between main MICOM of
main PCB and LCD (LED) dedicated MICOM for LCD (LED) control of display PCB.
LRSC269
****
EXPLANATION FOR MICOM CIRCUIT
- 44 -
ICEBEAM
COOLING
OFF
CUBE
FILTER
MONTH
EXPRESS/JET FRZ
DISPENSER
FREEZER
REFRIGERATOR
FILTER/LIGHT
LOOK
ROOM TEMP
DISPENSER & KEY
F
WATER
5
4
3
2
1
CRUSH
F
F
3 SECS
Main MICOM
LCD(LED) dedicated MICOM
DC 12V
GND
Transmission (error status)
Reception (notch status)
Main PCB
L/Wire FD/H(4-wires)
Display PCB