DOWNLOAD LG GR-429GVCA QVJA Service Manual ↓ Size: 3.89 MB | Pages: 60 in PDF or view online for FREE

Model
GR-429GVCA QVJA
Pages
60
Size
3.89 MB
Type
PDF
Document
Service Manual
Brand
Device
Refrigerator
File
gr-429gvca-qvja.zip
Date
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LG GR-429GVCA QVJA Service Manual ▷ View online

5) TEMP SENSOR CIRCUITS
The above circuit reads the surrounding temperature, DEFROSTING temperature and FREEZER temperature,
REFRIGERATOR temperature, MIRACLE ZONE temperature into MICOM(IC1). OPEN or SHORT state of each SENSOR
is as follows.
- 33 -
SENSOR
CHECK POINT
NORMAL (-30°C~50°C)
SHORT
OPEN
RT SENSOR 
POINT A Voltage
FREEZER SENSOR
POINT B Voltage
REFRIGERATOR SENSOR
POINT C Voltage
0.5V ~ 4.5V
0V
5V
DEFROST SENSOR
POINT D Voltage
MIRACLE ZONE SENSOR
POINT E Voltage
u
BEST
u
GOOD/BETTER
6) SWITCH INPUT CIRCUIT
The following circuit is a test switch input circuit for checking the refrigerator.
7) REFRIGERATOR DAMPER CIRCUIT
8) MIRACLE ZONE DAMPER CIRCUIT (BEST MODEL)
- 34 -
u
BEST
u
GOOD/BETTER
u
BEST
u
GOOD/BETTER
u
BEST MODEL
9) TEMPERATURE COMPENSATION
• TEMPERATURE COMPENSATION TABLE by adjusting resistance values. (the temp difference compared to the present
temp.) 
eg) If the compensation resistance of freezer compartment is changed from 10K (present resistance) to 18K (revised
resistance), the temp of freezer compartment goes up by +1.0°C.
- 35 -
u
BEST
u
GOOD/BETTER
FREEZER ROOM
RESISTANCE VALUES(R1)
TEMPERATURE COMPENSATION
REMARKS
180 k
Ω
+2.5°C
COMPENSATE WARMLY
56 k
Ω
+2.0°C
33 k
Ω
+1.5°C
18 k
Ω
+1.0°C
12 k
Ω
+0.5°C
10 k
Ω
0°C
STANDARD
8.2 k
Ω
-0.5°C
5.6 k
Ω
-1.0°C
3.3 k
Ω
-1.5°C
2 k
Ω
-2.0°C
470 
Ω
-2.5°C
COMPENSATE COOLLY
• TEMPERATURE  COMPENSATION OF REFRIGERATOR ROOM
• This circuit is aimed to input the necessary temperature compensation values into the MICOM in order to adjust the
refrigerator temperature which is different in each model.
- 36 -
470 
Ω
2 k
Ω
3.3 k
Ω
5.6 k
Ω
8.2 k
Ω
10 k
Ω
12 k
Ω
18 k
Ω
33 k
Ω
56 k
Ω
180 k
Ω
No
0.5 °C
1 °C
1.5 °C
2 °C
2.5 °C
3 °C
3.5 °C
4 °C
4.5 °C
5 °C
470
Ω
change
Up
Up
Up
Up
Up
Up
Up
Up
Up
Up
0.5 °C
No
0.5 °C
1 °C
1.5 °C
2 °C
2.5 °C
3 °C
3.5 °C
4 °C
4.5 °C
2 k
Ω
Down
change
Up
Up
Up
Up
Up
Up
Up
Up
Up
1 °C
0.5 °C
No
0.5 °C
1 °C
1.5 °C
2 °C
2.5 °C
3 °C
3.5 °C
4 °C
3.3 k
Ω
Down
Down
change
Up
Up
Up
Up
Up
Up
Up
Up
1.5 °C
1 °C
0.5 °C
No
0.5 °C
1 °C
1.5 °C
2 °C
2.5 °C
3 °C
3.5 °C
5.6 k
Ω
Down
Down
Down
change
Up
Up
Up
Up
Up
Up
Up
2 °C
1.5 °C
1 °C
0.5 °
No
0.5 °C
1 °C
1.5 °C
2 °C
2.5 °C
3 °C
Refrigerator 8.2 
k
Ω
Down
Down
Down
Drop
change
Up
Up
Up
Up
Up
Up
2.5 °C
2 °C
1.5 °C
1 °C
0.5 °C
No
0.5 °C
1 °C
1.5 °C
2 °C
2.5 °C
(RCR)
10 k
Ω
Down
Down
Down
Down
Down
change
Up
Up
Up
Up
Up
3 °C
2.5 °C
2 °C
1.5 °C
1 °C
0.5 °C
No
0.5 °C
1 °C
1.5 °C
2 °C
12 k
Ω
Down
Down
Down
Down
Down
Down
change
Up
Up
Up
Up
3.5 °C
3 °C
2.5 °C
2 °C
1.5 °C
1 °C
0.5 °C
No
0.5 °C
1 °C
1.5 °C
18 k
Ω
Down
Down
Down
Down
Down
Down
Down
change
Up
Up
Up
4 °C
3.5 °C
3 °C
2.5 °C
2 °C
1.5 °C
1 °C
0.5 °C
No
0.5 °C
1 °C
33 k
Ω
Down
Down
Down
Down
Down
Down
Down
Down
change
Up
Up
4.5 °C
4 °C
3.5 °C
3 °C
2.5 °C
2 °C
1.5 °C
1 °C
0.5 °C
No
0.5 °C
56 k
Ω
Down
Down
Down
Down
Down
Down
Down
Down
Down
change
Up
5 °C
4.5 °C
4 °C
3.5 °C
3 °C
2.5 °C
2 °C
1.5 °C
1 °C
0.5 °C
No
180 k
Ω
Down
Down
Down
Down
Down
Down
Down
Down
Down
Down
change
Modification
resistance
Current
resistance
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