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Model
GA-449
Pages
48
Size
3.45 MB
Type
PDF
Document
Service Manual
Brand
Device
Refrigerator
File
ga-449.zip
Date

LG GA-449 Service Manual ▷ View online

6) Take out the LEAD WIRE(17) assembly from the TOP
COVER FRONT(13) and assemble it on left side.
7) Remove bolts(18) securing HINGE-U(19). Unscrew of
the hinge pin(20). 
Place HINGE-U and seat hinge upside down and apply
them to left side of the refrigerator.
NOTE: Seat hinge to be placed under the HINGE-
U(19).
8) Remove bolts(22) securing HINGE-
C(23) and then remove HINGE-C(23).
Remove the freezer door. Move in left
side of the refrigerator CAP(24). Move
to left side of the refrigerator door
BRACKET DOOR(25) and screw(26).
9) Remove screws(27) and COVER(28)
and move CAP COVER(29). 
And remove bolts(30), HINGE-L(31),
and move PIN(32).
10) Assemble the HINGE-L(31) 
➝ COVER(28) ➝ Freezer Door ➝ HINGE-C(23) ➝ Refrigerator Door ➝ HINGE-U(19) ➝
TOP COVER FRONT(13) 
➝ COVER PWB(11) ➝ Connect the Housing Connector(9) ➝ DECO COVER(7) ➝
HANDLE(1) (5) 
Note: 
Reversing the doors is not covered by the warranty.
- 9 -
(17)
(13)
(19)
(20)
(18)
(21)
(24)
(23)
(22)
(25)
(26)
(32)
(31)
(30)
(27)
(28)
(29)
- 10 -
1. DOOR
Freezer Door
1) Refer to previous chapter "Instruction for Reversing
Door Swing".
2) Pull out the Door Gasket to remover from the 
Door Foam Assembly, F.
Refrigerator Door
1) Refer to previous chapter "Instruction for Reversing
Door Swing".
2) Pull out the Door Gasket to remove from the 
Door Foam Assembly, R.
2. DOOR SWITCH
1) Unplug the power cord from the outlet.
2) Loosen five screws in upper part and disconnect Top
Cover Front.
3) Disconnect Lead Wire from switch.
4) Disengage hook behind the switch by pressing it with
hands.
3. REFRIGERATOR ROOM LAMP
1) Unplug the power cord from the outlet. 
2) Remove the room lamp lid by taking down while pulling
its back projection.
3) Remove the lamp by turning it counterclockwise and
replace new one.
4) Assemble in reverse order of disassembly. 
Replacement bulb must be the same specification as
original.
• Don’t touch the lamp, in case of light on the long time.
Because it can be very hot.
• Lamp capacity is MAX 30W.
• The lamp will remain “ON” for 7minutes if the door is left
open and then it is “OFF” for safety. 
(If you reopen the door, the lamp is “On”.)
GASKET
Figure  7
Figure  9
DISASSEMBLY
Figure  10
ADJUSTMENT
- 11 -
1. COMPRESSOR
1) Role
The compressor intakes low temperature and low pressure
gas evaporated from Evaporator of the Refrigerator, and
condenses this gas to high temperature and high pressure
gas, and then plays delivering role to Condenser.
2) Composition
The Compressor is Composed of Compressor Apparatus
compressing gas, Compressor Motor moving Compressor
Apparatus and Case protecting Compressor Apparatus
and Motor. There is Relay Assembly (one set of PTC-
Starter and Over Load Protector (OLP)) in Compressor. On
the other hand, because the Compressor consists of
1/1000mm processing precision components and is sealed
after production in absence of dust or humidity, deal and
repair with care.
3) Note for Usage
(1) Be careful not to allow over-voltage and over-current.
(2) No Strike 
If applying forcible power or strike (dropping or careless
dealing), poor operation and noise may occur.
(3) Use proper electric components appropriate to the
Compressor.
(4) Note to Keep Compressor. 
If Compressor gets wet in the rain and rust in the pin of
Hermetic Terminal, the result may be poor operation
and poor contact may cause.
(5) Be careful that dust, humidity, and flux welding don't
inflow in the Compressor inside in replacing the
Compressor. Dust, humidity, and flux due to welding
which inflows to Cylinder may cause lockage and noise.
2. PTC-STARTER
1) Composition of PTC-Starter
(1) PTC (Positive Temperature Coefficient) is a no-contact
semiconductor starting device which uses ceramic
material and this material consists of BaTiO
3
.
(2) The higher the temperature is, the higher becomes the
resistance value. These features are used as starting
device for the Motor.
2) Role of PTC-Starter
(1) PTC is attached to Hermetic Compressor used for
Refrigerator, Show Case and starts Motor.
(2) Compressor for household refrigerator applies to
single-phase induction Motor. 
For normal operation of the single-phase induction
motor, in the starting operation flows in both main coil
and sub-coil. After the starting is over, the current in
subcoil is cut off. The proper features of PTC play all
the above roles. So, PTC is used as a motor starting
device.
3) PTC-Applied Circuit Diagram
According to Starting Method for the Motor
4) Motor Restarting and PTC Cooling
(1) For restarting after power off during normal
Compressor Motor operation, plug the power cord after
5 min. for pressure balance of Refrigerating Cycle and
PTC cooling.
(2) During normal operation of the Compressor Motor, PTC
elements generate heat continuously. Therefore, 
if PTC isn't cooled for a while after the power has been
shut off, Motor can't operate again.
5) Relation of PTC-Starter and OLP
(1) If the power is off during operation of Compressor and
the power is on before the PTC is cooled, (instant shut-
off within 2 min. or reconnect a power plug due to
misconnecting), the PTC isn't cooled and a resistance
value grows. As a result, current can't flow to the sub-
coil and the Motor can't operate and the OLP operates
by flowing over current in only in the main-coil.
(2) While the OLP repeats on and off operation about 3-5
times, PTC is cooled and Compressor Motor performs
normal operation. 
If OLP doesn't operate when PTC is not cooled,
Compressor Motor is worn away and causes circuit-
short and fire. Therefore, use a properly fixed OLP
without fail.
6) Note to Use PTC-Starter
(1) Be careful not to allow over-voltage and over-current.
(2) No Strike 
Don't apply a forcible power or strike.
(3) Keep apart from any liquid. 
If liquid such as oil or water away enter the PTC, 
PTC materials it may break due to insulation
breakdown of the material itself.
(4) Don't change PTC at your convenience. 
Don't disassemble PTC and mold. If the exterior to the
PTC-starter is damaged, resistance value is altered and
it may cause poor starting of the compressor motor
may cause.
(5) Use a properly fixed PTC.
PTC STARTER
HERMETIC
TERMINAL
COMPRESSOR
MOTOR
C
M
S
M
3
M
S
S
PTC
OVERLOAD 
PROTECTOR(O.L.P)
RSIR
RELAY ASSEMBLY
Figure  19
- 12 -
3. OLP (OVER LOAD PROTECTOR)
1) Definition of OLP
(1) OLP (OVER LOAD PROTECTOR) is attached to the
Hermetic Compressor and protects the Motor by cutting
off current in Compressor Motor in case of over-rising
temperature by Bimetal in the OLP.
(2) When over-voltage flows to Compressor motor, the
Bimetal works by heating the heater inside the OLP, 
and the OLP protects Motor by cutting off current which
flows to the Compressor Motor.
2) Role of the OLP
(1) The OLP is attached to the Hermetic Compressor used
for the Refrigerator and Show Case and prevents the
Motor Coil from being started in the Compressor.
(2) Do not turn the Adjust Screw of the OLP in any way for
normal operation of the OLP.
(Composition and connection Diagram of OLP)
CIRCUIT DIAGRAM
CONTACTING
POINT
COVER
BIMETAL
CONTACTING
POINT
HEATER
TERMINALS
ADJUST
SCREW
HEATER
BIMETAL
Figure  20
NOTE : 1. This is a basic diagram and specifications vary in different localities.
u
u
GA-479**L*/449**L*
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