LG LRTN19330xx Service Manual

CAUTION

BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

REFRIGERATOR

SERVICE MANUAL

models

LRTN22330

LRTN22320

LRTN19330

LRTN19320

CONTENTS

SAFETY PRECAUTIONS ....................................................................................................................................................... 2

SPECIFICATIONS................................................................................................................................................................... 3

PARTS IDENTIFICATION....................................................................................................................................................... 4

DISASSEMBLY.................................................................................................................................................................... 5-6

DOOR................................................................................................................................................................................... 5

DOOR SWITCH.................................................................................................................................................................... 5

FAN AND FAN MOTOR........................................................................................................................................................ 6

DEFROST CONTROL ASSEMBLY...................................................................................................................................... 6

LAMP.................................................................................................................................................................................... 6

CONTROL BOX-REFRIGERATOR...................................................................................................................................... 6

ADJUSTMENT..................................................................................................................................................................... 7-8

COMPRESSOR.................................................................................................................................................................... 7

PTC-STARTER..................................................................................................................................................................... 7

OLP (OVERLOAD PROTECTOR) ....................................................................................................................................... 8

TO REMOVE THE COVER PTC...........................................................................................................................................8

CIRCUIT DIAGRAM .......................................................................................................................................................... 9-10

TROUBLESHOOTING..................................................................................................................................................... 11-16

COMPRESSOR AND ELECTRICAL COMPONENTS ....................................................................................................... 11

PTC AND OLP.................................................................................................................................................................... 12

OTHER ELECTRICAL COMPONENTS ............................................................................................................................. 13

SERVICE DIAGNOSIS CHART.......................................................................................................................................... 14

REFRIGERATION CYCLE............................................................................................................................................ 15-16

OPERATION PRINCIPLE & REPAIR METHOD OF ICEMAKER .................................................................................. 17-20

DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM ............................................................................................... 21-33

EXPLODED VIEW & REPLACEMENT PARTS LIST ..................................................................................................... 34-39

SAFETY PRECAUTIONS

Please read the following instructions before servicing your refrigerator.

1. Check the refrigerator for electrical faults.

2. To prevent electric shock, unplug before servicing.

3. Always check line voltage and amperage.

4. Use standard electrical components or cause your skin to freeze and stick to the surfaces inside the freezer.

5. Don't touch metal products in the freezer with wet hands. This may cause frostbite.

6. Prevent water from spiling onto electric elements or the machine parts.

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7. Close the top door before opening the bottom door. Otherwise, you might hit your head when you stand up.

8. When tilting the refrigerator, remove any materials on the refrigerator, especially the glass shelves and stored food.

9. When servicing the evaporator, wear cotton gloves. This is to prevent injuries from the sharp evaporator fins.

10. Service on the refrigerator should be performed by a qualified technician. Sealed system repair must be performed by a CFC certified technician.

1. SPECIFICATIONS

EVAPORATOR

COLD AIR

MIXED AIR

AIR RETURN TO EVAPORATOR

FRESH FOOD

CONTROL

FREEZER

EVAPORATOR/ EVAPORATEUR

1-1 DISCONNECT POWER CORD BEFORE

SERVICING IMPORTANT – RECONNECT ALL GROUNDING DEVICES

All parts of this appliance capable of conducting electrical current are grounded. If grounding wires, screws, straps, clips, nuts or washers used to complete a path to ground are removed for service, they must be returned to their original position and properly fastened.

1-2 IMPORTANT NOTICE

This information is intended for use by individuals possessing adequate backgrounds of electrical, electronic and mechanical experience. Any attempt to repair a major appliance may result in personal injury and property damage. The manufacturer or seller cannot be responsible for the interpretation of this information, nor can it assume any liability in connection with its use.

1-3 ELECTRICAL SPECIFICATIONS

Temperature Control (Position : MID) .................... 8-(-6)°F

Defrost Control .......................................................... 7 hrs.

Defrost Thermostat ..................................................... 50°F

Electrical Rating :115V. AC, 60 Hz. ...................... 1-5 Amp.

Maximum Current Leakage ..................................... 0.5 mA

Maximum Ground Path Resistance .................. 0.14 Ohms

Energy Consumption ............... 19 cu.ft : 443 kWh/yr(Energy star)

....................................... 22 cu.ft : 468 kWh/yr(Energy star)

1-7 REPLACEMENT PARTS

Relay............................................................. 6748C-0004D

Overload ....................................................... 6750C-0004S

Defrost Thermostat ...................................... 6615JB2005B

Defrost Heater .............................. 19cu. ft : 5300JK1003D

............................... 22cu. ft : 5300JK1003J

Evaporator Fan Motor .................................. 4681JB1016J

Capacitor ................................................... OCZZJB2003H

Compressor (Hi-Side) .................................. 2521C-A62A8

Evaporator (Lo-Side) ..................... 19cu. ft : 5421JJ0003A

..................... 22cu. ft : 5421JJ0002A

Condenser .................................................... 5403JJ1003A

Dryer ............................................................. 5851JJ2002K

Condenser Fan Motor .................................. 4681JK1001B

Temperature Control ................................. 6871JB2043A,B

Main Control.................................................. 6871JB1185A

1-8 AIR FLOW / CIRCULATION D’AIR

1-4 NO LOAD PERFORMANCE

CONTROL POSITION: MID/MID

And Ambient of : .........................70°F ..........................90°F

Fresh Food, °F ...........................33-41 ...................... 33-41

Frozen Food, °F .........................(-4)-4....................... (-4)-4

Percent Running Time ...............25-35...................... 45-60

1-5 REFRIGERATION SYSTEM

Minimum Compressor Capacity Vacuum ................... 21 in.

Minimum Equalized Pressure

@ 70°F ....................................................... 49 PSIG

@ 90°F ....................................................... 56 PSIG

Refrigerant - R - 134a ............................................ 5.47 oz.

Compressor ..................................................... 649 BTU/hr

1-6 INSTALLATION

Clearance must be provided at top, sides and rear of the refrigerator for air circulation.

AT TOP ......................................................................... 1 in

AT SIDES ................................................................... 1/8 in

AT REAR ...................................................................... 1 in

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2. PARTS IDENTIFICATION

Pizza Nook*

CustomCube Ice maker *

CustomFit

FlexiFloor *

Digital Sensor Control

Refrigerator Light *

Chef Fresh * / Snack Pan

Shelves

Can Dispenser*

OptiBin Crisper

Base Grille

Leveling Screw (inside)

Refrigerator Door Bin

Egg Box*

Design-A-Door

Icebeam Door Cooling *

Door Cooling Dairy Bin

Freezer Door Bin *

Freezer Light

* on some models

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3. DISASSEMBLY

BOLT

HINGE

HINGE COVER

GASKET

LOWER HINGE

BOLT

DOOR SWITCH

LEAD WIRE

3-1 DOOR

● Freezer Door

1. Remove the hinge cover by pulling it upwards.

2. Loosen hexagonal bolts attaching the upper hinge to the

body and lift the freezer door.

Figure 1

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

assembly.

3-2 DOOR SWITCH

1. To remove the door switch, pry it out with a slotted-type driver, as shown in (Figure 4).

2. Disconnect the lead wire from the switch.

Figure 4

Figure 2

● Refrigerator Door

1. Loosen hexagonal bolts attaching the lower hinge to the body to remove the refrigerator door only.

Figure 3

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

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3-3 FAN AND FAN MOTOR

FAN

BRACKET

SHROUD

GRILLE

FAN MOTOR

GRILLE ASSEMBLY

DEFROST-CONTROL ASSEMBLY

CONTROL BOX

COVER LAMP

1. Remove the freezer shelf. (If your refrigerator has an icemaker, remove the icemaker first)

2. Remove the grille by pulling it out and 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.

Figure 5

3-5 LAMP

Figure 8

3-5-1 Refrigerator Compartment 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 counterclockwise.

5. Assemble in reverse order of disassembly. Replacement bulb must be the same specification as the original (Max. 60 W-2EA).

3-4 DEFROST CONTROL ASSEMBLY

Defrost Control assembly consists of Defrost Sensor and FUSE–M.

Defrost sensor functions to defrost automatically. It is attached to metal side of the Evaporator and senses Temperature. At the temperature of 162°F(72°C), it stops the emission of heat from the Heater.

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

1. Pull out the grille assembly. (Figure 6)

2. Separate the connector with the Defrost Control assembly and replace the Defrost Control assembly after cutting the Tie Wrap. (Figure 7)

Figure 6

Figure 9

3-5-2 Freezer Compartment Lamp

1. Unplug refrigerator or disconnect power.

2. Reach behind light shield to remove bulb.

3. Replace bulb with a 40-watt appliance bulb.

4. Plug in refrigerator or reconnect power.

3-6 CONTROL BOX-REFRIGERATOR

1. First, remove all shelves in the refrigerator, than remove the Refrigerator Control Box by loosening 2 screws.

Figure 7

Figure 10

2. Remove the Refrigerator Control Box by pulling it downward.

3. Disconnect the lead wire on the right position and separate the lamp sockets.

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4. ADJUSTMENT

PTC STARTER

SEALED TERMINAL

COMPRESSOR MOTOR

PTC

OVERLOAD PROTECTOR

RSCR

4-1 COMPRESSOR

4-1-1 Role

The compressor intakes low temperature and low pressure gas from the evaporator of the refrigerator and compresses this gas to high-temperature and high-pressure gas. It then delivers the gas to the condenser.

4-1-2 Composition

The compressor includes overload protection. The PTC starter and OLP (overload protector) are attached to the outside of the compressor. Since the compressor is manufactured to tolerances of 1 micron and is hermetically 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) If compressor is dropped or handled carelessly, poor

operation and noise may result.

(3) Use proper electric components appropriate to the

Particular Compressor in your product.

(4) Keep Compressor dry.

If Compressor gets wet (in the rain or a damp environment) and rust forms in the pin of the Hermetic Terminal, poor operation and contact may result.

(5) When replacing the Compressor, be careful that dust,

humidity, and soldering flux don’t contaminate the inside of the compressor. Dust, humidity, and solder flux contaminate the cylinder and may cause noise or improper operation even cause it to lock up.

4-2 PTC-STARTER

4-2-1 Composition of PTC-Starter

(1) PTC (Positive Temperature Coefficient) is a no-contact

semiconductor starting device which uses ceramic material consisting of BaTiO

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

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

4-2-2 Role of PTC-Starter

(1) The PTC is attached to the Sealed Compressor and is

used for starting the Motor.

(2) The compressor is a single-phase induction motor.

Durign the starting operation, the PTC allows current flow to both the start winding and main winding.

4-2-3 PTC-Applied Circuit Diagram

● Starting Method for the Motor

Figure 11

4-2-4 Motor Restarting and PTC Cooling

(1) It requires approximately 5 minutes for the pressure to

equalize before the compressor can start.

(2) The PTC device generates heat during operation.

Therefore, it must be allowed to cool before the compressor can restart.

4-2-5 Relation of PTC-Starter and OLP

(1) If the compressor attempts to restart before the PTC

device is cooled, the PTC device will allow current to flow only to the main winding.

(2) The OLP will open because of the over current

condition. This same process will continue (3 to 5 times) when the compressor attempts to restart until the PTC device has cooled. The correct OLP must be properly attached to prevent damage to the compressor.

4-2-6 Note for Using the PTC-Starter

(1) Be careful not to allow over-voltage and over-current. (2) Do not drop or handle carelessly. (3) Keep away from any liquid.

If liquid such as oil or water enters the PTC, PTC materials may fail due to breakdown of their insulating capabilities.

(4) If the exterior of the PTC is damaged, the resistance

value may be altered. This can cause damage to the compressor and result in a no-start or hard-to-start condition.

(5) Always use the PTC designed for the compressor and

make sure it is properly attached to the compressor.

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4-3 OLP (OVERLOAD PROTECTOR)

Part

Customer part number

Lot code/ date code

330 FBYY -S1 BOX98

12345678

Physical termination part number

Electrical

characteristics

part number

No. Name

Base, phenolic (UL 94 V-0 rated) Movable arm support, plated steel Stationary contact support, plated steel Heater support, plated steel Heater, resistance alloy Disc, thermostatic alloy Movable arm, spring temper copper alloy Contact, movable, silver on copper Contact, stationary, silver on copper Slug, plated steel Cover, polyester (UL 94 V -0 rated) Pin connector, plated copper alloy (To engage 2.33/2.66 mm dia. pin) Quick-connect terminal, brass, conforms to UL 310, MEMA DC-2, DIN 46344

(OVERLOAD PROTECTOR cross section)

4-3-1 Definition of OLP

(1) OLP (OVERLOAD PROTECTOR) is attached to the

Compressor and protects the Motor by opening the circuit to the Motor if the temperature rises and activating the bimetal spring in the OLP.

(2) When high current flows to the Compressor motor, the

Bimetal works by heating the heater inside the OLP, and the OLP protects the Motor by cutting off the current flowing to the Compressor Motor.

4-3-2 Role of the OLP

(1) The OLP is attached to the Sealed Compressor used

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

(2) For normal operation of the OLP, do not turn the Adjust

Screw of the OLP in any way.

4-4 TO REMOVE THE COVER PTC

1) Remove the Cover Back M/C.

(2) Remove the screw on Cover PTC.

Figure 12

(3) Remove two Housings on upper part of Cover PTC.

(4) Take out the cover PTC from upper to lower position

like .

(5) Turn 45° in the direction of  and take it out.

(6) Assembly in reverse order of disassembly.

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5. CIRCUIT DIAGRAM

BEST MODEL

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BETTER MODEL

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6. TROUBLESHOOTING

Readings OK

Open or short

YES

Readings OK

Open or short

YES YES

6-1 COMPRESSOR AND ELECTRIC COMPONENTS

Power Source.

Check resistance of Motor Compressor.

Remove PTC-Starter from Compressor and measure voltage between Terminal C of Compressor and Terminals 5 or 6 of PTC.

No Voltage.

Applied voltage isn't in range of Rating Voltage ±10%.

Check resistance between M-C, S-C and M-S in Motor Compressor.

Check resistance of PTC-Starter.

Check resistance of two terminals in PTC-Starter.

Check OLP.

Check resistance of two terminals in OLP.

(Reated Voltage ±10%)?

OLP disconnected?

Advise customer that power supply needs to be checked by an electrician.

Replace Compressor.

Replace OLP.

Check connection condition.

Reconnect.

Replace PTC-Starter.

Replace OLP.

Check starting state.

Check the power supply under load. (Compressor attempting to re-start after being off for 5 minutes).

Supply voltage rating with ±10%.

Did compressor start?

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Compressor is OK

Replace the compressor

6-2 PTC AND OLP

Shows continuity

Open

Normal operation of Compressor is impossible or poor.

Separate PTC-Starter from Compressor and measure resistance between No. 5 and 6 of PTC-Starter with a Tester.(Figure 13)

Separate OLP from Compressor and check resistance value between two terminals of OLP with a Tester. (Figure 14)

Observation value is 115V/60Hz : 6.8Ω±30%

The resistance value is 0Ω (short) or ∞ (open).

Check another electric component.

Replace OLP.

Check another electric component.

Replace PTCStarter

Figure 13

Figure 14

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