LG LDC22720 Series, Service Manual

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CONTENTS
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SAFETY PRECAUTIONS
Please read the following instructions before servicing
your refrigerator.
1. Check the refrigerator for current leakage.
2. To prevent electric shock, unplug before servicing.
3. Always check line voltage and amperage.
4. Use standard electrical components.
5. Don’t touch metal products in the freezer with wet
hands. This may cause frostbite.
6. Prevent water from spiling on to electrical elements
or the machine parts.
7. Before tilting the refrigerator, remove all materials
from on or in the refrigerator.
8. When servicing the evaporator, wear gloves to
prevent injuries from the sharp evaporator fins.
9. Service on the refrigerator should be performed by
a qualified technician. Sealed system repair must be
performed by a CFC certified technician,
SAFETY PRECAUTIONS .....................................................................................................
1. SPECIFICATIONS ............................................................................................................
2. PARTS IDENTIFICATION .................................................................................................
3. DISASSEMBLY .................................................................................................................
3.1 Door .............................................................................................................................
3.2 Door switch ..................................................................................................................
3.3 Fan and fan motor ........................................................................................................
3.4 Defrost control assembly ..............................................................................................
3.5 Lamp ............................................................................................................................
3.6 Control Box-Refrigerator ..............................................................................................
3.7 Multi Duct......................................................................................................................
4. ADJUSTMENT ..................................................................................................................
4.1 Compressor ..................................................................................................................
4.2 PTC-Starter ..................................................................................................................
4.3 OLP (Overload Protector) ............................................................................................
4.4 To remove the cover PTC ............................................................................................
5. CIRCUIT DIAGRAM . ........................................................................................................
6. TROUBLESHOOTING
......................................................................................................
6.1 Compressor and electrical components ......................................................................
6.2 PTC and OLP ..............................................................................................................
6.3 Other electrical components .......................................................................................
6.4 Service Diagnosis chart ..............................................................................................
6.5 Refrigeration cycle ......................................................................................................
7. DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM . ................................................
7.1 Function ......................................................................................................................
7.2 PCB function ...............................................................................................................
7.3 Resistance specification of sensor ..............................................................................
7.4 Troubleshooting ...........................................................................................................
7.5 Main PWB assembly and parts list ..............................................................................
7.6 PWB diagram ..............................................................................................................
8. EXPLODED VIEW AND REPLACEMENT PART LIST ....................................................
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