LG Electronics GR-P257/L257, GR-P227/L227 service manual Trouble Diagnosis

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Problems

Symptom

Causes

Checks

Measures

Remarks

 

 

 

 

 

 

Defective

Buzzer rings

Trouble mode indication.

Check trouble diagnosis function.

Repair troubles

Refer to mode

display button.

but key does

 

 

 

indication in

 

not sense even

 

 

 

function

 

button is

 

 

 

explanations.

 

pressed.

 

 

 

 

 

 

 

 

 

 

Door Buzzer

Buzzer

Defective connecting lead wire from

Check lead wire associated with door

Repair lead wire.

Check model

 

continuously

main PCB to door switch.

switch.

 

with dispenser.

 

 

 

 

 

 

 

rings or door

Defective freezer compartment door

Refer to door switch in parts repair

Replace Freezer

 

 

opening alarm

switch parts.

guide.

compartment door

 

 

does not work.

 

 

switch.

 

 

 

 

 

 

 

Bad water/ice

Ice and water

Defective connecting lead wire from

Check Lead Wire associated with lever

Repair lead wire.

 

dispenser.

are not

Main PCB to lever switch.

switch with a tester.

 

 

 

 

 

 

 

 

 

dispensed.

Defective lever switch parts

Refer to door switch in parts repair guide.

Replace lever switch.

 

 

 

 

 

 

 

 

 

Defective photo coupler IC parts.

Check voltage change at photo coupler

Replace photo

 

 

 

 

output terminals with lever switch

coupler IC or PCB.

 

 

 

 

pressed. It is OK if voltage change is

 

 

 

 

 

between 0V - 5V.

 

 

 

 

 

 

 

 

 

 

Defective relay associated with ice

Check relay (RY4, RY5, RY12)

Replace defective

 

 

 

dispense (geared motor, cube and

with a tester.

relay.

 

 

 

dispenser solenoid).

 

 

 

 

 

 

 

 

 

 

 

Defective parts associated with ice

Check resistance of parts with a tester.

Replace defective

 

 

 

dispense (geared motor, cube and

 

parts.

 

 

 

dispenser solenoid).

 

 

 

 

 

 

 

 

 

 

 

Defective relay associated with water

Check relay (RY7) with a tester

Replace defective

 

 

 

dispense.

 

relay.

 

 

 

 

 

 

 

 

 

Defective parts associated with water

Check resistance of parts with a tester.

Replace defective

 

 

 

dispenser.

 

parts.

 

 

 

 

 

 

 

TROUBLE DIAGNOSIS

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Image 73
Page 72 Page 74
Contents Refrigerator Contents Page Front View SpecificationsRef No. GR-L227 Ref No. GR-P257 Ref No. GR-L257 Freezer Refrigerator compartment compartment Parts IdentificationRef No. GR-P227/GR-P257EXTERNAL Filter Parts Identification Parts Identification How to Adjust Door Height of Refrigerator HOW to Install RefrigeratorBefore Installation How to Install Water PipeClass Shape and Spec Nomenclature Single Lever Type Faucet general Connection of Pipe Connector a and BTwo Hands Type Faucet General TypeFilter Cleaning When customer uses bottled waterOutternal Filter Filter Fixation Replacement of water filter After installing water filterConfirm the amount of water supplied to the icemaker How to Control the Amount of Water Supplied to IcemakerDisplay Power saving Mode Door Alarm Buzzer Mute ModeMicom Function Monitor PanelDescription of Function Exhibition ModeLCD Back Light Control Outside temperature display functionLock function display button lock Filter condition display functionDispenser use selection When ice maker does not operate smoothlyAutomatic ice maker Express FreezerMiracle Zone function Super freezingControl of variable type of freezing room fan Control of M/C room fan motor Door opening alarmDoors of freezing Or home barSequential operation of built-in product Failure Diagnosis Function Test Function Mode Operation Contents RemarksFunction of dispenser and water dispenser built-in Test Mode 1 Status LCD Test Mode 2 Status LCDExplation for Micom Circuit Power circuitExplanation for PWB circuit GR-P227/L227Oscillation circuit Reset circuitGR-P227/L227/P257/L257 Load Driving Circuit Load/dispenser operation, door opening circuitDispenser operation circuit Lever Switch sensing circuit Measuring partDoor opening sensing circuit Short Open Temperature sensing circuitOption designation circuit model separation function Switch entry circuitSeparation Connection Status Application Standard Stepping motor operation circuit Fan motor driving circuit freezer, mechanical area +5 C +9F 33 k Ω 56 k Ω JCR1 Main PCB Sensor resistance characteristics table Miracle Zone Stepping Motor / Display Operation Principle Icemaking Mode Harvest ModeFill/Park Position Water supply amount TableDefect diagnosis function Stage Items Indicator RemarksCircuit Trouble Diagnosis Trouble ShootingNot performed Evaporator by heating as Refrigeration Refrigeration Residual Refrigeration No cooling air circulation Is weak Fan does not work Recess Sounds Compressor compartment operating sounds Bad soldering Bad rivet contact Short Structure Door foam Appearance Sag Power FaultsProblems Causes Checks Measures Remarks Problems Causes Checks MeasuresTemperature Cooling Disconnected from the motor Refer to fan motor disassembly Defrosting failure Problems CausesMeasures Remarks Remove the parts and replace it Icing Discharging port of cooling air Sound Click Contraction of evaporator Sources Sound Burping It happens when refrigerant expands Odor Micom Problems Symptom Causes Checks Measures RemarksDriving circuits Motor damper Replace door switch Trouble Diagnosis Items Unit Standards Purposes Remarks Cooling Cycle Heavy RepairSummary Of Heavy Repair Process Contents ToolsItems Precautions Precautions During Heavy RepairWhen replacing a compressor When replacing a drierPractical Work For Heavy Repair Inserting a capillary tubeVacuum Sequence Pipe ConnectionCharging sequence Calculation of amount of refrigerant charged12-0mm Standard Regulations For Heavy RepairAsia / Middle-East Africa Brazing Reference DrawingsEurope & CIS / America Explain the principles of temperature change Problems Checks and MeasuresSound depends on the installation location Explain general principles of soundsExplain the flow of refrigerant Explain the procedure and principles of ice maker operationExplain the characteriistics of moving parts Explain the principles of water supplied to dispenserMeasures for Symptoms on Temperature Odor and Frost Check the temperature control button and set at strongExplain the basic principles of food odor Explain the basic principles of frost formationOthers Remove a freezer door HOW to Disassemble and AssembleHandle InsertTubeLineColletClip Assembly COVER, Dispenser Exploded View Optional part Ref No. GR-P227/GR-P257Ref No. GR-L227/GR-L257 Freezer Compartment Optional part Refrigerator CompartmentMachine Compartment ICE & Water Part Dispenser Part No JD8999A
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