LG GR-B197GVQ Service Manual page 91

T R O U B L E D I A G N O S I S
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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 CON5 (1 and 7) Replace relay (RY 7 Refer to load
with
a
tester after pressing main
and RY
14)
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 ring and terminal contact in main PCB and wire and replace
or
circuit in circuit
key does not display
PCB
connecting lead wire. directly connect bad explanation.
sense even
contact
terminal
to
button is lead wire.
pressed.
Key
is
continuously depressed
due
to
Disassemble frame
display
and confirm
Adjust
or
replace
structural interference.
visually. interfering
structures.