LG LFC21776ST Bedienungsanleitung

REFRIGERATOR

SERVICE MANUAL

CAUTION

BEFORE SERVICING THE PRODUCT,

READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

MODELS : LFC21776ST COLORS : STAINLESS(ST)

CONTENTS

- 2 -

SAFETY PRECAUTIONS

Please read the following instructions before servicing your refrigerator.

1. Unplug the power before handling any elctrical componets.

2. Check the rated current, voltage, and capacity.

3. Take caution not to get water near any electrical components.

4. Use exact replacement parts.

5. Remove any objects from the top prior to tilting the product.

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

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

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

DISASSEMBLY .................................................................................................................................................................. 5-10

DOOR ............................................................................................................................................................................... 5-6

DOOR ALIGNMENT ............................................................................................................................................................. 6

HOW TO REMOVE AND REINSTALL THE PULLOUT DRAWER ................................................................................... 7-9

ADJUSTMENT ................................................................................................................................................................. 10-11

COMPRESSOR ................................................................................................................................................................. 10

PTC-STARTER .................................................................................................................................................................. 10

OLP (OVERLOAD PROTECTOR) ..................................................................................................................................... 11

TO REMOVE THE COVER PTC ........................................................................................................................................ 11

CIRCUIT DIAGRAM .............................................................................................................................................................. 12

TROUBLESHOOTING ..................................................................................................................................................... 13-17

COMPRESSOR AND ELECTRIC COMPONENTS ........................................................................................................... 13

OTHER ELECTRICAL COMPONENTS...............................................................................................................................14

SERVICE DIAGNOSIS CHART ......................................................................................................................................... 15

REFRIGERATION CYCLE ............................................................................................................................................ 16-17

ICE MAKER AND DISPENSER WORKING PRINCILLES AND REPAIR........................................................................18-21

DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM ................................................................................................. 22-35

EXPLODED VIEW & REPLACEMENT PARTS LIST ...................................................................................................... 36-40

1. SPECIFICATIONS

- 3 -

Opaque Drawer Type

PTC Starting Type

Fin Tube Type

Spiral Condenser

R-134a (125 g)

ISO10 (280 ml)

SHEATH HEATER

LED Module(27)

60 W (1 EA)

VEGETABLE TRAY

COMPRESSOR

EVAPORATOR

CONDENSER

REFRIGERANT

LUBRICATING OIL

DEFROSTING DEVICE

REFRIGERATOR

FREEZER

LAMP

ITEMS SPECIFICATIONS

Side Rounded

35 X 30 X 69 (WXDXH) 21cu.ft

254 lb. (115 kg))

Fan Cooling

Micom Control

Full Automatic

Heater Defrost

PCM, VCM, Stainless

Bar

ABS Resin

Polyurethane Foam

DOOR DESIGN

DIMENSIONS(inches)

NET WEIGHT(pounds)

COOLING SYSTEM

TEMPERATURE CONTROL

DEFROSTING SYSTEM

DOOR FINISH

HANDLE TYPE

INNER CASE

INSULATION

ITEMS

21 cu. ft

SPECIFICATIONS

DIMENSIONS

Description LFC21776ST

Depth w/ Handles

Depth w/o Handles

Depth w/o Door

Depth (Total with Door Open)

Height to Top of Case

Height to Top of Door Hinge

Width

Width (door open 90 deg. w/o handle)

Width (door open 90 deg. w/ handle)

30 in.

27 1/2 in.

23 5/8 in.

42 1/4 in.

68 3/8 in.

69 3/4 in.

35 3/4 in.

39 1/4 in.

44 1/4 in.

2. PARTS IDENTIFICATION

- 4 -

Digital Sensor

Control

Refrigerator Light

Shelves

Modular Door Bin

Glide'N'Serve

Ice Bin

Durabase

Divider

Dairy Bin

Modular Door Bin

Bottle Holder

Modular Door Bin

Pullout Drawer

Optibin Crisper

Keeps fruits and

vegetable fresh

and crisp

AUTOMATIC

ICEMAKER

3. DISASSEMBLY

- 5 -

3-1 DOOR

Refrigerator door

1. Remove the top hinge cover and disconnect the wire

harness.

2. Remove the ground screw.

3. Rotate the lever hinge and lift off hinge.

4. Lift off the refrigerator door.

5. Replace in the reverse order.

Door gasket replacement

1. Insert gasket bracket clips

1) Insert gasket bracket edge beneath door frame edge.

2) Turn upper gasket bracket spring so that both spring

ends are in the door channel.

3) Push in clip until you hear it snap securely into place.

4) Push in remaining two clips until you hear each snap

securely into place.

Note : Make sure that no part of gasket bracket edge

protrudes from beneath door frame edge.

2. Remove gasket bracket clips

There are two clips on each door. Start bracket removal

near one of the middle clips.

1)Pull gasket back to expose gasket bracket clip and

door frame.

2)Insert a flat tip screwdriver into seam between gasket

bracket and door frame and pry back until clips snaps

out.

3)Continue prying back along seam until all clips snap

out.

3. Remove gasket

Pull gasket free from gasket channel on the three

remaining sides of door.

Figure 2

Frame Cover Handle

Figure 5

Correct Incorrect

Figure 3

Gasket

Bracket Clip

Gasket

Bracket

Flat Tip

Screwdriver

Figure 4

Spring

Gasket

Bracket Clip

Figure 1

HINGE COVER

HINGE

Door gasket removal

1. Remove door frame cover

Starting at top of cover and working down, snap cover

out and away from door.

Door

Frame

Door

Frame

2. Insert gasket into channel

1) Snap gasket assembly into the door bracket.

Inserting the gasket assembly into the bracket door

3. Replace door frame cover

Starting at top of cover and working down, snap the

cover back into door.

2) Press gasket into channels on the three remaining

sides of door.

Figure 7

Figure 9

Figure 8

3-2 DOOR ALIGNMENT

If the space between your doors is uneven, follow the

instructions below to align the doors:

1. With one hand, lift the door you want to raise at middle

hinge.

2. With other hand, use pliers to insert snap ring as shown.

3. Insert additional snap rings until the doors are aligned.

(Three snap rings are provided with the product.)

Correct

Figure 6

Incorrect

- 6 -

- 7 -

3-3 HOW TO REMOVE AND REINSTALL THE PULLOUT DRAWER

3-3-1 FOLLOW STEPS TO REMOVE

Step 1) Open the freezer door. Step 2) Remove the lower basket.

Step 3) Remove the two screws from the guide rails (one

from each side).

Step 5) First : Remove the gear from the left side first by releasing the tab behind the gear, place a screwdriver between

the gear and the tab and pull up on the gear.

Second : Remove the center rail.

Third : Remove the gear from the right side by following the same steps for the left side.

NOTE : THIS TAB MUST BE PUSHED IN TO RELEASE THE GEAR.

Step 4) Lift the freezer door up to unhook it from the rail

support and remove.

Pull both rails to full extension.

- 8 -

3-3-2 FOLLOW STEPS TO REINSTALL

Step 1) Reinstall the right side gear into the clip.

Step 2) Insert the rail into the right side gear. Gears do not

need to be perpendicular to each other.

Step 4) The rail system will align itself by pushing the rails

all the way into the freezer section.

Pull the rails back out to full extension.

Step 5) Reinstall the freezer door by inserting the rail tabs

into the guide rail.

Step 6) Reinstall the two screws into the guide rails

(one from each side). Step 7) Reinstall the lower basket, and close the freezer

door.

Step 3) Insert the rail into the left side gear, and insert the

gear into the clip.

- 9 -

3-3-3 PULL OUT DRAWER

To separate the drawer, push the front left and right hooks in direction to pull up and remove.

Then gently lift the gear part of rear left and right side of the drawer and pull it out in direction.

To install, reposition the gear part of rear left and right side of the drawer after pulling out both rails as much as possible,

and gently push down both left and right side while checking the hook on the front part.

- 10 -

4. ADJUSTMENT

4-2 Introduction of E-Linear Compressor

E-Linear compressor is run by mechanical part design

through automatically varying the cooling power. The

main parts consist of compressor and Sub PCB which

controls the compressor. PCB authorizes constant

voltage and constant frequency to the compressor and

protects it.

Drive half stroke after turning on initial power for 30

seconds. Then, slowly increase stroke and reach target

input. Once reaching the target input, input naturally

changes according to refrigerator load without any special

control.

Interval 1) Half stroke interval - after initial running, stay at

the initial value for 30 seconds

Interval 2) Running interval - Increase at every 0.8 till it

reaches the target input; it takes about 3’ 45”

Interval 3) CVCF interval - Run by target voltage and main

operating frequency and the input naturally

changes according to refrigerator load

❸

❶❷

4-1-1 Role

4-1 COMPRESSOR

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 Note for Usage

(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 Cover PTC

Compressor may fail due to breakdown of their

insulating capabilities.

(4) Always use the Parts designed for the compressor and

make sure it is properly attached to the compressor.

Parts may appear physically identical but could have

different electrical ratings. Replace parts by part number

and model number. Use only approved substitute parts.

4-1-3 REMOVE THE COVER PTC

(1) Remove the Cover Back M/C

(2) Loosen two screws on comp base

(3) Use a L-shaped flap tooll to pry off the cover

(4) Assembly in reverse order of disassembly

4-2-1 Control of Compressor Block Diagram

4-2-2 Compressor operating pattern

Compressor Controller Inverter

PWM

Signal

Frequ

-ency

Linear

Comp

DC link

Voltage

Main

Micom

Calculate counter

electromotive force

Counter elec-

tromotive force

Vcap Voltage

Control Block Diagram of Compressor

Comp. input

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