DOWNLOAD LG GR-459 Service Manual ↓ Size: 4.27 MB | Pages: 89 in PDF or view online for FREE

REFRIGERATOR

- 10 -

●

1) Refer to previous chapter "Instruction for Reversing

Door Swing".

2) Pull out the Door Gasket to remover from the 

Door Foam Assembly, F.

●

1) Refer to previous chapter "Instruction for Reversing

Door Swing".

2) Pull out the Door Gasket to remove from the 

Door Foam Assembly, R.

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.

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.

• You must check the O-RING, which is made by rubber

and prevent electric spark.

• 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

- 11 -

1) Remove freezer drawers.

2) Remove two cap, screws and loosen two screws in

Grille Fan.

3) Pull out the Grille Fan and Shroud, F.

4) Disconnect the housing of lead wire.

5) Separate the Fan Assembly.

6) Losse 2 screw fixed to the Bracket.

7) Pull out Shroud, F remove the Fan Motor Assembly.

8) Separate the Motor Bracket and Rubber.

Defrost Control Assembly consists of Thermistor and Fuse,
Melting. Thermistor functions to defrost automatically and it
is attached to metal side of the Evaporator and senses
temperature.

Fuse, Melting is a kind of safety device for preventing
overheating of the Heater when defrosting. 

At the temperature of 77°C, it stops the emission of heat
from the Heater.

1) Pull out the Shroud, F after removing the Grille.

2) Separate the connector connected with the Defrost

Control Assembly and replace new one.

In this refrigerator, Heater, Sheath is used for defrosting
heater. During heating, the temperature of heater rises
about 300~350°C. Therefore, be careful not to burn while
servicing.

1) After removing the Grille and Shroud, separate the

Heater, Sheath by disconnecting the connectors.

2) Exchanged Heater, Sheath and connected the housing.

Heater, Sheath

GUIDE FAN

FAN

SHROUD

FAN MOTOR

GRILLE

Thermister

Fuse, Melting

- 12 -

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.

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.

(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.

(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.

(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.

●

According to Starting Method for the Motor

(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.

(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.

(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