Service Diagnosis Chart - LG LTCS20220W Service Manual

6-4 SERVICE DIAGNOSIS CHART

COMPLAINT SYMPTOM
1. No Display at all
Electronic Display not
operating correctly
2. Partial or
abnormal display
1. Display on but
Not cooling
compressor not
operating
1. Display on
Not cold enough compressor is
operating
1. Freezer has too
Not defrosting
much frost
POSSIBLE CAUSES
1. Supply voltage not within specifications
2. Open in wiring harness from PWB board
3. Open in door monitor switch circuit
1. Supply voltage not within specifications
2. Open wiring harness from PWB board
1. Compressor not operating
2. Open in compressor circuit
1. Condenser fan motor not operating
2. Condenser coils blocked
3. Evaporator fan motor not operating
4. Internal air flow blocked
5. Sensor not operating properly
6. Door not sealing
7. Evaporator frosted up
8. Sealed system related problem
1. Open in defrost circuit
2. Defrost sensor not operating correctly
3. Defrost drain clogged
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SOLUTION
1. Check supply voltage to refrigerator
2. Chack wiring and connectors to PWB board
3. Check door monitor circuit
1. Check supply voltage to refrigerator
2. Chack wiring and connectors to PWB board
1. Check for compressor operation by using the test
key on main circuit board.
2. Check for open on OLP, PTC, compressor, wiring.
1. Check condenser fan motor and wiring circuit
2. Check air flow across condenser
3. Check evaporator fan motor and wiring circuit
4. Check air ducts
5. Check refrigerator and freezer sensors
6. Check for proper door seal
7. Check defrost circuit components
1. Check defrost heater and circuit using Test Key
2. Check sensor
3. Check drain