LG LRTPC2031BS, LRTPC1831BS Owner’s Manual

2001.06.01160/120

CIRCUITDIAGRAM

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3854JD1046C

2. PARTS IDENTIFICATION

FREEZER

COMPARTMENT

Freezer Shelf

Automatic Ice Maker

Ice Cube Box

Freezer Temperature

Control Dial

REFRIGERATOR

COMPARTMENT

Temperature

Control Dial

Lamp

Shelves

Egg Box

Snack Corner

Crisper

Used to keepfruits

and vegetables
fresh and crisp.

Lamp

Freezer Door Bin

Door Cooling
On the refrigerator door,
the cold air passageway is
installedto supply

coldair tothe doorsideof
the refrigerator

compartment.

Egg Tray

Can Server

Dairy Comer
Can Storage

Adjustable
Door Bin

Refrigerator Door
Rack

Base Grille

Push the grille toward

the refrigerator

until it snaps

into place.

Leveling Screw
(Inside)

-5-

3. DISASSEMBLY

34 DOOR

• Freezer Door

1. Remove the hinge cover by pulling it upward&
2 Loosen hexagonal bolts fixing the upper hinge to the

body and lift the freezer door.

BOLT

HINGE

HINGE COVER

Figure 6

3. Pull out the door gasket to remove from the door foam
assembly.

GASKET

3-2 DOOR SWITCH

1. To remove the door switch, pull out it with a slotted type
driver as shown in (figure 9).

2. Disconnect the lead wire from the switch.

LEAD WIRE

DOOR SWITCH

Figure 9

3-3 THERMOSTAT

1. Remove Control BoxJRby loosening2 screws attached to

ceiling of Refrigeratorcompartment (Figure 10)

2. Separate the thermostat and dial knob F.

3. Remove the thermostat by disconnecting the lead wire.

Figure 7

• Refrigerator Door
I. Loosen hexagonal bolts attaching the lower hinge to the

body to remove the refrigerator door only.

LOWER HINGE

BOLT

__1

Figure 8

2. Pull out the door gasket to remove from the door foam

assembly.

Figure 10

-6-

3-4 FAN AND FAN MOTOR

1. Remove the freezer shelf. (If your refrigerator have an

Ice Maker, disassemble the Ice maker first)

2. Remove the grille by pulling itout end by loosening a

screw.

3. Remove the Fan Motor assembly by loosening 4 screws
and disassemble the shroud.

4. Pull out the fan and separate the Fan Motor and Bracket.

3°6 LAMP

REFRIGERATOR ROOM LAMP

f_ ...v°£_ -

Figure 16-t

SHROUD

q

Figure 12

3-5 DEFROST CONTROL ASSEMBLY

Defrost control assembly consists of Defrost Thermostat
and FUSE--M.

Defrost Thermostat functions to defrost automatically and it
is attached to metal side of the Evaporator and senses

Temp.

Fuse-M is a safety device for preventing over-heating of the
Heater when defrosting.

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

I. Pull out the grille assembly.

2. Separate the connector connected with the Defrost
Control assembly and replace the Defrost Control

assembly after cutting the Tie Wrap. (Figure 14)

SHROUD-F

DEF-THERMO

3-6-1 Refrigerator room lamp

1. Unplug the power cord from the outlet.

2. Remove refrigerator shelves.

3. Release the hooks on both ends of the lamp shield and
pull the shield downward to remove it.

4. Turn the lamp countemlockwise.

5. Assemble in reverse order of disassembly. Replacement

bulb must be the same specification as original.
(Max 40 W)

FREEZER ROOM LAMP

Figure 16-2

3-6-2 Freezer room lamp

1. Unplug refrigerator or disconnect power.

2. Reach behind light shield to remove bulb.

3. Replace bulb with a 25-watt appliance bulb,

4. Plug in refrigerator or reconnect power.

3-7 CONTROL BOX-R

1. First, remove all shelves in the refrigerator and Control

Bax-R by loosening 2 screws.

Figure 13

FUSE-M

HOLDER FUSE Figure 14

J

COVER LAMP_@ Figure 17

2. Remove the Control Bax-R by pulling it downward,

3. Disconnect the lead wire on the right position and
seperete timer, themostat, Lamp socket, eto,

-7-

4. ADJUSTMENT

44 COMPRESSOR

4-1-1 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.

4-1-2 Composition
The compressor includes overload protection. The PTC

starter and OLP (overload protector) are outside the

compressor. Since the compressor is manufactured to
tolerances of 1 micron, and is sealed in a dust - and

moisture - free environment, use extreme caution when
repairing it.

4-1-3 Note for Usage

(1) Be careful not to allow over-voltage and over-current.
(2) No Strike

If applying forcible bower or strike (dropping or careless

handling), 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 welding flux don't

contaminate the compressor inside when replacing the

Compressor. Dust, humidity, and flux due to welding

which contaminates the cylinder may cause leakage

and noise.

4-2 PTC-STARTER

4-2-1 Composition of PTC-Starter
(1) PTC (Positive Temperature Coefficient) is a no-contact

semiconductor starting device whioh uses ceramic
material consisting of BaTiO3.

(2) The higher the temperature is, the higher the resistance

value. These features are used as starting device for
the Motor.

4-2-2 Role of PTC-Starter

(1) PTC is attached to Hermetic Compressor used for

Refrigerator, Show Case, and startthg 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
suboeil is cut off. The proper features of PTC play all
the above roles. So, PTC is used as a motor starting

device.

4-2-3 PTC-Applied Circuit Diagram

• According to Starting Method for the Motor

OVERLOAD PROTECTOR(O.L.P)

@ o

og; E SOR

PTC STARTER HERMETIC

RSIR

4-2-4 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 beat continuously. Therefore,
if PTC isn't cooled for a while after the power has been

shot off, the motor will not restart.

4-2_5 Relation of PTC-Starter and OLP
(1) If the power is off during operation of Compressor and

the bower is on before the PTC is cooled, (instant shut-
off within 2 min. or unplugging and reconnecting), the

PTC isn't cooled and a resistance value grows. As a
result, current can't flow to the sub-coiL the Motor can't

operate, and the OLP operates by flowing over currant
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, always use a properly

attached OLE

4-2-6 Note to Use PTC-Starter

(1) Be careful not to allow over-volfage and over-current.
(2) Do not strike

Don't apply a forcible power or strike.

(3) Keep apart from any liquid.

If liquid, such as oil or water away enters the PTC,

PTC materials may fail due to insulation breakdown of
the material itself.

(4) Don't change PTC at your convenience.

Don't disassemble PTC and case. 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 attached PTC.

TERMINAL

Figure 19

-8-

4-30LP (OVERLOAD PROTECTOR)
4-3-1 Definition of OLP
(1) OLP (OVERLOAD PROTECTOR) is attached to the

Compressor and protects the Motor by cutting the
current to the Motor ifthe temperature dsas and
activates the bimetal spring in the OLF_

(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=

4-3-2 Role of the OLP
(1) The OLP is attached to the Hermetic Compressor used

for the Refrigerator and prevents the Motor Coil from
being started in the Compressor.

(2) Do not turn the Adjust Screw ofthe OLP in any way for

normal operation of the OLR
(Composition and connection diagram of OLP)

5. CIRCUIT DIAGRAM

CONTACTING
POINT

SCREW

ADJUST

COVER BIMETAL

BIMETAL

HEATER

Figure 21

CIRCUITDIAGRAM

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OFF ON OFF 10SeC

ON ON OFF 11sec

OFF OFF ON 12se¢

ON OFF ON 13sec

OFF ON ON 14See

ON ON ON 15See

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_IME

3854JD1046C

-9-

6. TROUBLESHOOTING

6-1 COMPRESSOR AND ELECTRIC COMPONENTS

Remove the PTC-

;_ Power Source.

-_ Starter from the
Compressor and

measure the voltage
between Terminal C of

Compressor and
Terminals 5 or 6 of PTC.

.__ (Rating Voltage YES

±10%)? I "_

No Voltage.

Applied voltage isn't

in the range of Rating
Voltage ±10%.

Check the _--_ Check the resistance
resistance of I I among M-C. S-C and

Motor I I M-S in Motor

Compressor. I L Compressor.

Check the
resistance of

PTC-Starter.

---_ heck the resistance

of two terminals in
PTC-Star[er.

Replace OLR

OLP disconnected?

to use a regular __

_ Advise the customer j [_

transformer.

NNN_OOOReplace CoYm_eesor. _

YES

NO _' PTC-Starter.

YES

Check connection

condition.

Recenne_.

Replace

h

I

[_ I check OLR _'_ check if applying _,l_ OLP w°rks within',30 sec. in forcible OLP, , YES ,[_

I l a regular OLR

I I I operation by turning _ Replace OLR I

I -'

NO

starting state. I r I starting voltage after 5 I I the voltage of Rating

_ Icheck _ Measura minimum I_ Components start io I_ O.K"

I I min. for balancing cycle I I Voltage +-10%

|| PTc.pressureand cooling the i i below. I NO

-10-

I

6-2 PTC AND OLP

Normal operation of
Compressor is

impossible or poor.

_}_ Separate the PTC-

Starter from
Compressor and

measure the
resistance between
No. 5 and 6 of PTC-
Starter with a Tester or

(Figure 21)

r

I

Observation value is _l
220V/50Hz :22{2±30%

115V/60Hz :6.8_.2±30%
240V/5OHz : 33_;2_30%

127, 220V/6OHz : 22_

:T:30%

The resistance value _1
is 0 or several

hundred _.

/

-!

/

Check another I
electric components. I

Starter

Replace PTC- I

6-3 DEFROST TIMER

Normal operation of

the Defrost Timer is

impossible.

No defrosting.

Poor cooling.

Wheatstooe Bridge. _i_

Compressor and check _ electric components. I
the resistance value I I

between two terminals I r
Separate the OLP from I YES,.=[ Check another
of OLP with a Tester. _ I

(Figure 22) _ Replace OLF_

-_ the point of first click

___ Position the Cam Shaft to

F Next, position the Cam

___ No, 1 (brown) and

sound and check the
current flowing between

terminals No. l(bn3wn)
and No. 2(bright orange).

Shaft to the point of
second click sound and

check Ihe current flowing
between terminals

No. 4 (black)
(Figure 23).

The value is =_.

I

ure 21 gure 22

The resistance is co ____ Replace the I

.._ Tbe resistance is I-_ Replace the I

.__ The resistance is about

0(2 or variable. Defrost Timer.

220VI5OHz :20K.Q

115V/60Hz :7.8K_2

Defrost Timer.

electric components.

_t heck the another I

-_ Turn the Cam Shaft.

Shake about 3 times

-}_ with holding the Cam
Shaft and Body soffiy.

I .o

-_ Loud click sound.

-11 -

Replace the I

]_ Defrost Timer. I

I DRaefp Oasctetheer" I

Figure 23

6_OTHER ELECTRIC COMPONENTS

• Cooling is impossible

doesn't run. I_

I Compressor I

I Compressor runs

poorly,

the following
Check if current flows to I [ Cause

components.

a. Thermostat _Poor contacting and

b. Starting devices m Shorted or broken.
c. OLP __ Poor contacting

d. Compressor coil

e. Defrost Timer _ Poor contacting
f. Circuit parts ______-_or shorted.

._ Check a starting _ Low voltage,

voltage.

to starting devices, and broken,

__ Check if current flows _ Poor contacting

in sub-coil of

._ Check current flowing _ Shorted.

Compressor.

, t

gasleakage.

or shorted.

Coilshorted.

I

Replace

indicated component. I

Raise the voltage. I

• Cooling ability is poor

Fan motor
doesn't run.

Muchfrost is builtupon L
the EVAPORATOR. /

-_ CheckcepecityofOLl_ _ Lack of capacity.

above are normal. Compressor.

._ The items described _ Coil of motor

__ heck current flowing

Poor contacting.

of the door S/W.

L_ Check current flowing

r I in the Fan Motor.

.._ Check the runningcondition of Timer.

Check current flowing

"_ of the following

components.

• Defrost Thermostat

• Fuse-M

Check current flowing

of the following

--_ components.

• L-cord

• TE-Plate Heater

_ Running is poor.

Coil is shorted.

(Coil is shorted.)

Shorted.

_ Replacethe compressor. I

indicated component.

Replace I

indicated component.

__.[ eplace I

> l Replace

indicated component. I

-12-