LG GR-642BEPF Service Manual ▷ View online
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7-2-10 TEMPERATURE COMPENSATION INPUT CIRCUIT.
• This CURCUIT should be used to input the degree of temperature compensation necessary for the control of FREEZER
ROOM and REFRIGERATOR ROOM temperatute.
• If you want to compensate FREEZER ROOM temperature, Change R1 RENINTA CE following the TEMPERATURE
COMPE NATIO TABLE.
If you want to compensate REFRIGERATOR ROOM temperatur, Change R2 RENINTA CE following the TEMPERATURE
COMPE NATIO TABLE.
If you want to compensate REFRIGERATOR ROOM temperatur, Change R2 RENINTA CE following the TEMPERATURE
COMPE NATIO TABLE.
TEMPERATURE COMPENSATION TABLE
R1, R2=10K
Ω
Standard
ex) Now R1 = 12 K
Ω
, R2 = 5.6 K
Ω
........want to compensate - 2 ˚C for FREEZER ROOM temperature and + 4 ˚C for
REFRIGERATOR ROOM temperature
R1 = 12 K
Ω
..............................8.2 K
Ω
R2 = 5.6 K
Ω
.............................18 K
Ω
FREEZER ROOM
REFRIGERATOR ROOM
REMARKN
R1
R2
180 K
Ω
+ 5 ˚C
56 K
Ω
+ 4 ˚C
33 K
Ω
+ 3 ˚C
18 K
Ω
+ 2 ˚C
12 K
Ω
+ 1 ˚C
10 K
Ω
+ 0 ˚C
8.2 K
Ω
- 1 ˚C
5.6 K
Ω
- 2 ˚C
3.3 K
Ω
- 3 ˚C
1.8 K
Ω
- 4 ˚C
470 K
Ω
- 5 ˚C
TEMPERATURE
COMPENSATION
RESISTANCE
COMPENSATE WARMLY
STANDARD
COMPENSATE COOLLY
IC1
(MICOM)
29
23
P66
(AIN6)
(AIN6)
P60
(AIN0)
(AIN0)
R1
10K
R11
10K
10K
FREEZER ROOM
TEMPERATURE
COMPENSATION
TEMPERATURE
COMPENSATION
REFRIGERATOR ROOM
TEMPERATURE
COMPENSATION
TEMPERATURE
COMPENSATION
R2
10K
R12
10K
10K
7-2-11 KEY INPUT AND LED ON CIRCUIT
The upper CIRCUIT judges whether KEY on the OPERATION PANEL is pressed or not, and lights up each LED for
representing function. It operates by SCAN manner.
representing function. It operates by SCAN manner.
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CON4
CON101
IC8
TD62783AP
(UDN2981A)
IC9–1
ND65003AP
9
5
31
14
4
32
15
3
33
16
2
34
17
1
35
18
7
36
10
R18
(1/2W)
R19
(1/2W)
R20
(1/2W)
R21
(1/2W)
R22
(1/2W)
R23
(1/2W)
R26
100
R25
2K
16
R17
2.2K
13
R24
2.2K
IC9–2
CC7
102
FRZ.
TEMP
REF.
TEMP
SUPER
FREZE
R102
120
SUPER
COOL
PWB ASSY,DISPLAY
LED
MODULE
D106
SW101
SW102
D107
SW103
D108
SW104
D109
IN4148*4
6
37
11
5
38
12
4
39
13
3
40
14
2
41
15
10
8
R16
2.2K
R15
2.2K
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
8
9
10
11
12
13
13
12
11
10
9
8
7
6
5
4
3
2
1
R101
56
IN4004*5
F1+R1
F2
F3
F4
F5
R4
R5
R3
R2
FR
QF2
QF1
QF4
QF5
GP
GP
GP
GP
QF
QR5
QR
QR4
QR2
QR1
FR2
FR1
FR3
FR4
GP
FR5
GP
GP
GP
GP
FR6 GP
FR7 GP
FR8 GP
QF3
QR3
GP
GP
D105
D104
D103
D102
D101
P10
P11
P12
P13
P14
P15
P16
P17
P20
P21
P22
P03
IC1
(MICOM)
- 33
-
7-4. TRUBLE SHOOTING
• Replace PCB when no trouble after checking the contents of trouble.
CLASSIFICATION
STATE OF TROUBLE
POINT BE CHECKED
CHECKING METHOD
CONTENT
REMEDY
POWER SOURCE
1. All the DISPLAY
1. FREEZER/
FREEZER/REFRIGERATOR
POWER SOURCE is poor
Certify Fuse.
is poor
LED OFF
REFRIGERATOR
DOOR OPEN
Certify outlet Voltage.
2. DISPLAY LED
2. LAMP is dim.
CHECK with the naked.
Applied voltage mistake
Use boosting TRANS.
represents abnormal
3. The connection of
Certify connection of
CONNECTOR connection
Reconnect CONNECTOR.
operation.
CONNECTOR of MAIN PWB. CONNECTOR.
connection is poor.
TRANS FUSE open.
TRANS FUSE open.
Replace TRANS.
4. The conncetion of
Certify connection of
CONNECTOR
Reconnect CONNECTOR.
CONNECTOR of UPPER
of CONNECTOR
connection is poor.
UPPER HINGE PART
Certify connection of
is poor.
of DISPLAY PCB
COOLING is poor
NO COOLING
1. COMPRESSOR operates?
PRESS TEST KEY on MAIN
COMPRESSOR lock or
Replace COMPRESSOR.
PWB once. (forced COOLING)
blocked.
•If pass less than 7 minutes
OLP, PTC is poor.
Replace OLP, PTC.
after stop of COMP, don't
COMPRESSOR RELAY IS
Replace MAIN PWB RY1
press it and stand-by.
poor
THE CONNECTING WIRE
THE CONNECTING WIRE
Certify the black wire of MAIN
is poor.
PWB CONNECTOR (CON2)
2. Whether refrigerant leaks or
Measure the amount of frost
Refrigerant leakage.
Remedy the leaking part
leaks or not.
sticking on EVA and the
and reaching Refrigerant.
surface temperature of
condenser pipe.
condenser pipe.
FREEZER
1. Whether FAN MOTOR
PRESS TEST KEY on
DOOR S/W is poor.
Replace DOOR S/W.
TEMPERATURE is poor
operates or not.
MAIN PWB once.
FAN MOTOR is poor
Replace FAN MOTOR.
(force COOLING)
DOOR LINE contact.
Replace DOOR LINER.
CONETTING WIRE is poor.
Certify MOTOR and the
connection of the white wire
of MAIN PWB CONNECTOR.
(CON2)
connection of the white wire
of MAIN PWB CONNECTOR.
(CON2)
2. DEFROSTING normal?
Certify the amount of frost
DEFROSTING is poor.
See the DEFROSTING
sticking on EVA.
trouble.
3. SENSOR normal?
Check resistance the
SENSOR REGISTANCE is
Recplace SENSOR
SENSOR in the FREEZER
poor.
CONTROL BOX-F
- 34
-
CLASSIFICATION
STATE OF TROUBLE
POINT BE CHECKED
CHECKING METHOD
CONTENT
REMEDY
COOLING is poor.
REFRIGERATOR
1. FREEZER TEMPERATURE
See "FREEZER
Certify the attaching state
TEMPERATURE is
is normal?
TEMPERATURE is poor".
of DOOR.
poor.
2. DAMPER normal?
Check DAMPER.
DAMPER is poor.
Replace DAMPER.
3. DAMPER normal?
Damper is opened and
DAMPER FREEZING.
Replace the DAMPER and
closed once and opened
and seal the leaking part of
again when pressing the
part of cold air.
TEST KEY once on the
DAMPER is poor.
Replace the DAMPER.
MAIN PWB.
(resistance)
Connection is poor.
Certify the connection of
connector of DAMPER ASM
and MAIN PWB.
REED S/W is poor.
Certify the connection and
remedy.
Replace the DAMPER.
4. Cool air of FAN MOTOR is
Certify the amount of cool air
FAN MOTOR is poor.
Replace FAN MOTOR.
is sufficient?
and its speed touching check
Passage of cool air blocking.
Remove impurities.
supplied into
(DUCT part)
REFRIGERATOR while
EVA frozen.
See "DEFROSTING is poor".
DAMPER opens.
5. Damper assembling is
Certify the leakage of cool
Cool air leakage.
Leaking part SEALING.
normal?
air from DAMPER.
REFRIGERATOR
1. DAMPER assembling is
Certify the leakage of cool
Cool air leakage.
Leaking part SEALING.
freezes.
poor?
air from DAMPER.
2. DAMPER normal?
See "Damper normal?" in
"REFRIGERATOR
temperature is poor".
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