LG LRSC26980TT Service Manual - Page 89

Check relay RY4, RY5, RY12

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TROUBLE DIAGNOSIS - 89 - Problems Symptom Causes Defective Buzzer does Trouble mode indication. display button. not sound and buttons do not operate. Checks Check trouble diagnosis function. Measures Repair troubles Remarks Refer to mode indication in function explanations. Door Buzzer Buzzer continuously rings or door opening alarm does not work. Defective connecting lead wire from main PCB to door switch. Defective freezer compartment door switch parts. Bad water/ice dispenser. Ice and water are not dispensed. Defective connecting lead wire from Main PCB to lever switch. Defective lever switch parts Defective photo coupler IC parts. Defective relay associated with ice dispense (geared motor, cube, and dispenser solenoid). Defective parts associated with ice dispense (geared motor, cube, and dispenser solenoid). Defective relay associated with water dispense. Defective parts associated with water dispenser. Check lead wire associated with door switch. Refer to door switch in parts repair guide. Repair lead wire. Replace Freezer compartment door switch. Check model with dispenser. Check Lead Wire associated with lever Repair lead wire. switch with a tester. Refer to door switch in parts repair guide. Replace lever switch. Check voltage change at photo coupler Replace photo output terminals with lever switch coupler IC or PCB. pressed. It is OK if voltage change is between 0V - 5V. Check relay (RY4, RY5, RY12) Replace defective with a tester. relay. Check resistance of parts with a tester. Replace defective parts. Check relay (RY7) with a tester Check resistance of parts with a tester. Replace defective relay. Replace defective parts.

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TROUBLE DIAGNOSIS
- 89 -
Problems
Symptom
Causes
Checks
Measures
Remarks
Defective
Buzzer does
Trouble mode indication.
Check trouble diagnosis function.
Repair troubles
Refer to mode
display button.
not sound
indication in
and buttons
function
do not operate.
explanations.
Door Buzzer
Buzzer
Defective connecting lead wire from
Check lead wire associated with door
Repair lead wire.
Check model
continuously
main PCB to door switch.
switch.
with dispenser.
rings or door
Defective freezer compartment door
Refer to door switch in parts repair
Replace Freezer
opening alarm
switch parts.
guide.
compartment door
does not work.
switch.
Bad water/ice
Ice and water
Defective connecting lead wire from
Check Lead Wire associated with lever
Repair lead wire.
dispenser.
are not
Main PCB to lever switch.
switch with a tester.
dispensed.
Defective lever switch parts
Refer to door switch in parts repair guide.
Replace lever switch.
Defective photo coupler IC parts.
Check voltage change at photo coupler
Replace photo
output terminals with lever switch
coupler IC or PCB.
pressed. It is OK if voltage change is
between
0V - 5V.
Defective relay associated with ice
Check relay (RY4, RY5, RY12)
Replace defective
dispense (geared motor, cube, and
with a tester.
relay.
dispenser solenoid).
Defective parts associated with ice
Check resistance of parts with a tester.
Replace defective
dispense (geared motor, cube, and
parts.
dispenser solenoid).
Defective relay associated with water
Check relay (RY7) with a tester
Replace defective
dispense.
relay.
Defective parts associated with water
Check resistance of parts with a tester.
Replace defective
dispenser.
parts.