LG LRSC26980TT Service Manual - Page 88

Replace relay RY 7

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TROUBLE DIAGNOSIS - 88 - Problems Symptom Causes Checks Measures Remarks Bad defrost. Defrost is not working. Defrost lead wire is cut. Check if defrost lead wire is cut with a tester. Reconnect Lead Wire. Defective defrost driving relay. Check the voltage of CON2 (1 and 7) with a tester after pressing main PCB test switch twice. If the voltage is normal then it is OK. Replace relay (RY 7 Refer to load and RY 3) or PCB. driving conditions check in circuit explanation. Defective defrost sensor parts. Check the resistance of defrost sensor Replace defrost with a tester. sensor. Refer to sensor resistance characteristic table of circuit explanation. Defective buzzer Buzzer continuously rings or door opening alarm does not work. Defective connecting lead wire from main PCB to door switch. Defective door switch parts. Check lead wire related to door switch with a tester. Refer to door switch in parts repair guide. Repair lead wire. Replace door switch. Defective display button Buzzer does not sound and buttons do not operate. Key input wire is cut or bad connector terminal contact in main PCB and display PCB connecting lead wire. Check input wire with a tester. Reconnect lead Refer to display wire and replace or circuit in circuit directly connect bad explanation. contact terminal to lead wire. Key is continuously depressed due to structural interference. Disassemble frame display and confirm visually. Adjust or replace interfering structures.

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TROUBLE DIAGNOSIS
- 88 -
Problems
Symptom
Causes
Checks
Measures
Remarks
Bad defrost.
Defrost is not
Defrost lead wire is cut.
Check if defrost lead wire is cut with a
Reconnect Lead
working.
tester.
Wire.
Defective defrost driving relay.
Check the voltage of CON2 (1 and 7)
Replace relay (RY 7
Refer to load
with a tester after pressing main
and RY 3) or PCB.
driving conditions
PCB test switch twice.
check in circuit
If the voltage is normal then it is OK.
explanation.
Defective defrost sensor parts.
Check the resistance of defrost sensor
Replace defrost
Refer to sensor
with a tester.
sensor.
resistance
characteristic
table of circuit
explanation.
Defective
Buzzer
Defective connecting lead wire from
Check lead wire related to door
Repair lead wire.
buzzer
continuously
main
PCB to door switch.
switch with a tester.
rings or door
Defective door switch parts.
Refer to door switch in parts repair
Replace door switch.
opening alarm
guide.
does not work.
Defective
Buzzer does
Key input wire is cut or bad connector
Check input wire with a tester.
Reconnect lead
Refer to display
display button
not sound
terminal contact in main PCB and
wire and replace or
circuit in circuit
and buttons
display PCB connecting lead wire.
directly connect bad
explanation.
do not
contact terminal to
operate.
lead wire.
Key is continuously depressed due to
Disassemble frame display and confirm
Adjust or replace
structural interference.
visually.
interfering
structures.