LG LFC20770SB Service Manual page 65

4) Poor cooling in refrigerator section.
No Checking flow
1-. Execute TEST MODE #1.
1
2-. Press and Hold Refrigerator door
switch (both).
3-. Check for air flow trough Duct
assembly.
1-. Unplug CON4 from Main PCB.
2
2-. Check resistance value between Red
& Yellow Wires.
3-. Check resistance value between Blue
& White wires.
NOTE: Measurement "A" and "B" must be within
spec, If "A" or "B" are not mach with the spec,
consider it as "Other Value" condition.
A B
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Result & SVC Action
Result
Wind
No Wind
Result
373.5~456.5Ù
Other Value
SVC Action
Go to step #6
Go to step #2
SVC Action
Go to step #6
Go to step #3