Freezer Undercool Compensation Circuit; Communication Circuit; Connecting L/Wire Between Main Pcb And Display Pcb - LG LSXS26466 Series Service Manual

Micom Circuit description

2. Freezer undercool compensation circuit

Undercool compensation
JCF3
CUT
CUT
►Above option circuit compensates the freezer temperature by simply cutting the circuit during the service.
2-1. Communication circuit and connecting L/wire between main PCB and display PCB
As the communication circuit, the following circuit exchanges information required between main MICOM of main PCB and
MICOM exclusively for LED for LED control of display PCB.
Sending/Receiving L/wire is required with DC12V required to operate the display PCB.
Communication error occurs when the information exchange between main MICOM of main PCB and MICOM exclusively
for LED for LED control of display PCB is disconnected for more than 30 seconds
Main PCB
Main MICOM
Temperature compensation from cut
JCF3
-1
JCF4 -1
JCF4
CUT
CUT
L/Wire FD/H(4 wires)
DC 12V
GND
Send (Error condition)
Receive (NO TCH condition)
-2
Freezer temperature
compensation
0 (Factory default)
-1
-1
-2
Display PCB
MICOM exclusively
Remarks
for LCD