LG Electronics GR-P257/L257 Problems Checks and Measures, Explain general principles of sounds

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TROUBLE DIAGNOSIS

4. HOW TO DEAL WITH CLAIMS

4-1. Sound

Problems	Checks and Measures

"Whizz" sounds	■ Explain general principles of sounds.
	• All refrigerator when functioning properly have normal operating sound. The
	compressor and fan produce sounds.
	There is a fan in the freezer compartment which blows cool air to freezer and
	refrigerator compartments. "Whizz" sounds are heard when the air passes
	through the narrow holes into the freezer and refrigerator compartments.
	■ Cooling Fan sound in the compressor compartment.
	• There is a fan on the back of the refrigerator, which cools the compressor
	compartment. If there is a small space between the refrigerator and the wall, the
	air circulation sounds may be noticeable.
	■ Noise of Compressor.
	• This operating sound happens when the compressor compresses the
	refrigerant. The compressor rotates at 3600RPM. The sound of compressor
	operation becomes louder as the refrigerator capacity increases.

"Click" sounds	■ Explain the principles of temperature change.
	• The sounds happens when pipes and internal evaporator in the refrigerator
	compartment expand and contract as the temperature changes during the
	refrigerator operation. This sound also happens during defrosting, twice a day,
	when the ice on the evaporator melts.

"Clunk" sound	■ Explain that it comes from the compressor when the refrigerator starts.
	• When the refrigerator operates, the piston and motor in the compressor rotate
	at 3600RPM. This sound is caused by the vibration of motor and piston when
	they start and finish their operation. This phenomena can be compared with that
	of cars. When the car engine ignites and starts to rotate, the loud sound
	becomes gradually quiet. When the engine stops, it stops with vibration.

Vibration sound	■ Check the sound whether it comes from the pipes vibration and friction.
	• Insert rubber or leave a space between pipes to avoid the noise.
	• Fix the fan blade if the noise is due to the collision of fan and shroud.
	• Fix the drip tray if it is loosened.
	■ Sound depends on the installation location.
	• Sound becomes louder if the refrigerator is installed on a wooden floor or near a
	wooden wall. Move it to the another location.
	• If the refrigerator is not leveled properly, a small vibration can make a loud
	sound. Please adjust the level of the refrigerator.

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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 RefrigeratorHow to Install Water Pipe Before InstallationClass Shape and Spec Nomenclature Single Lever Type Faucet general Connection of Pipe Connector a and BTwo Hands Type Faucet General TypeWhen customer uses bottled water Filter CleaningOutternal 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 FreezerSuper freezing Miracle Zone functionControl 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/L227Reset circuit Oscillation 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 circuitSwitch entry circuit Option designation circuit model separation functionSeparation 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 Problems Causes Defrosting failureMeasures 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 RepairBrazing Reference Drawings Asia / Middle-East AfricaEurope & 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