LG Gr P227 Ytqa Service Manual
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2-6. IcingTROUBLE DIAGNOSIS -91- Problems Causes Checks Measures Remarks Icing in the 1) Bad circulation of cool air. - Check the food is stored properly - Be acquainted with how to use. - Check the defrost refrigerator - Clogged intake port in the (check discharge and intake port - Sealing on connecting parts. related parts if problem compartment. refrigerator compartment. are clogged). - Check the damper and replace is caused by faulty - Damper icing. - Sealing is not good. - Check icing on the surface of it if it has defects. defrosting. - Pipe icing. - Too much food is stored and clogs baffle and cool air path (pipe) after - Check defrost. (After forced - Discharging the discharge port. dissembling the container box. defrosting, check ice in the pipe icing. - Bad defrosting. - Check icing at intake ports of evaporator and pipes.) freezer and refrigerator compartment. 2) Faulty door or refrigerator - Check gasket attached conditions. - Correct the gasket attachment - Replacement should compartment. - Check door assembly conditions. conditions and replace it. be done when it - Faulty gasket. - Door assembly and replacement. cannot be repaired. - Faulty assembly. 3) Overcooling in the refrigerator - Check refrigerator compartment - Replace faulty parts. compartment. is overcooled (when button - Faulty damper in the refrigerator pressed on weak). compartment. - Check parts are faulty. - Faulty MICOM (faulty sensor) 4) Bad defrosting - Check frost on the evaporator - Check parts related to defrosting. - Moisture cannot frost - Heater wire is cut. after dissembling shroud and fan - Check defrosting. (Check ice on the on the evaporator but - Defective defrost sensor. grille. evaporator and pipe.) can be sucked into the - Defrosing cycle. - Check ice on intake port of freezer refrigerator, being and refrigerator compartment. condensed and iced, interferes with cool air circulation, and suppresses sublimation. 5) Customers are not familiar with - Check food interferes with door - Be acquainted with how to use. this machine. closing. - Door opens. - Check ice on the ceilings. - High temperature, high moisture, and high load.
TROUBLE DIAGNOSIS -92- Problems Causes Checks Measures Remarks Ice in the freezer 1) Bad cooling air circulation. - Check food storage conditions - Be acquainted with how to use. - Check the parts related compartment. - Intake port is colgged in the freezer visually.(Check clogging at intake - Check defrost (Check ice on the to defrosting if the - Surface of fan compartment. and discharging port of cooling air.) evaporator and pipes after forced problem is caused by grille. - Discharging port is Clogged. - Check food occupation ratio in defrosting). the faulty defrosting. - Wall of freezer - Too much food is stored. volume(Less than 75%). compartment. - Bad defrosting. - Check frost on the evaporator after - Cool air dissembling shroud and fan grille. discharging port.- Check icing at intake port of - Basket(rack) refrigerator compartment. area. - Food surface. 2) Bad freezer compartment door - Check gasket attachment - Correct the gasket attachement - Replace when it can not - Icing in the - Faulty gasket conditions. conditions and replace it. be repaired. shute. - Faulty assembly - Check door assembly conditions. - Door assembly and replacement. 3) Over freezing in the freezer - Refrigerator operates pull down. -Replace defective parts. compartment. (Check if it is operated - Faulty MICOM. intermittently) - The Temperature of freezer compartment is satisfactory, but over freezing happens in the refrigerator compartment even though the notch is set at weak. 4) Bad defrosting. - Check frost on the evaporator after - Check parts related to defrosting. - Heater wire is cut. dissembling shroud and grille. - Check defrosting.(Check ice on the - Faulty defrost sensor. - Check ice on the intake port in the evaporator and pipes after forced - Defrosting cycle refrigerator compartment. defrosting.) 5) User is not familiar with how to - Check food holds door open. - Be acquainted with how to use. use. - Check ice on the ice tray. - Door opens. - High moisture food(water) is stored.
2-7. SoundTROUBLE DIAGNOSIS -93- Problems Causes Checks Measures Remarks Whizz sound 1. Loud sound of compressor 1.1 Check the level of the 1) Maintain horizontal level. operation. refrigerator. 2) Replace rubber and seat if they 1.2 Check the rubber seat are sagged and aged. conditions (sagging and aging). 3) Insert rubber where hand contact reduces noise in the pipe. 2. Pipes resonat sound which is 2.1 Check the level of pipes 4) Avoid pipe interference. connected to the compressor. connected to the compressor 5) Replace defective fan and fan and their interference. motor. 2.2 Check rubber inserting 6) Adjust fan to be in the center of conditions in pipes. bell mouth of the fan guide. 2.3 Touch pipes with hands or screw 7) Leve a clearance between -driver (check the change of interfering parts and seal gaps in sound). the structures. 8) Reassemble the parts which make 3. Fan operation sound in the freezer 3.1 Check fan insertion depth and sound. compartment. blade damage. 9) Leave a clearance if evaporator 3.2 Check the interference with pipes and suction pipe touch structures. freezer shroud. 3.3 Check fan motor. 3.4 Check fan motor rubber insertion and aging conditions. 4. Fan operation sound in the 4.1 Same as fan confirmation in the compressor compartment. refrigerator. 4.2 Check drip tray leg insertion. 4.3 Check the screw fastening conditions at condenser and drip tray.
TROUBLE DIAGNOSIS -94- Problems Causes Checks Measures Remarks Vibration sound. 1. Vibration of shelves and foods in 1-1. Remove and replace the 1) Reassemble the vibrating parts (Cluck) the refrigerator. shelves in the refrigerator and insert foam or cushion where 2. Pipes interference and capillary 1-2. Check light food and container vibration is severe. tube touching in the compressor. on the shelves. 2) Leave a clearance where parts compartment. 2-1. Touch pipes in the compressore interfere with each other. 3. Compressor stopper vibration. compartment with hands. 3) Reduce vibration with rubber 4. Moving wheel vibration. 2-2 Check capillary tube touches and restrainer if it is severe. 5. Other structure and parts cover back. (especially, compressor and pipe). vibration. 3-1 Check compressor stopper 4) Replace compressor stopper if it vibration. vibtates severely. 4-1 Check vibration of front and rear moving wheels. 5-1 Touch other structures and parts. Irregular sound. 1. It is caused by heat expansion 1-1 Check time and place of sound 1) Explain the principles of refrigeration (Click). and contraction of evaporator, sources.and that the temperature difference shelves, and pipes in the between operation and defrosting refrigerator.can make sounds. 2) If evaporator pipe contacts with other structures, leave a clearance between them (freezer shroud or inner case).
TROUBLE DIAGNOSIS -95- Problems Causes Checks Measures Remarks Sound Burping It happens when refrigerant expands - Check the sound of refrigerant at the - Check the restrainer attached on the (almost the same at the end of capillary tube. initial installation. evaporator and capillary tube weld as animals crying - Check the sound when the refrigerator joints and attach another restrainer. sound). starts operation after forced defrosting. - If it is continuous and servere, insert - Check the restrainer attachment capillary tube again (depth:15±3mm) conditions on the evaporator and - Fasten the capillary tube to suction capillary tube weld joints. pipes or detach in the compressor compartment. - Explain the principles of freezing cycles. Water boiling or It happens when refrigerant passes - Check the sound when compressor is - Explain the principles of freezing cycles flowing sound. orifice in accumulator internal pipes by turned on. and refrigerant flowing phenomenon by the pressure difference between - Check the sound when compressor is internal pressure difference. condenser and evaporator. turned off. - If sound is servere, wrap the accumulator with foam and restrainer. Sound of whistle When door closes, the internal pressure - Check the sound by opening and - Broaden the cap of discharge hose for when door of the refrigerator decreases sharply closing the refrigerator or freezer doors. defrosting in the compressor closes. below atomosphere and sucks air into compartment. the refrigerator, making the whistle - Seal the gap with sealant between out sound.and inner cases of hinge in door.
2-8. OdorTROUBLE DIAGNOSIS -96- Problems Causes Checks Measures Remarks Food Odor. Food (garlic, kimchi, etc) - Check the food is not wrapped. - Dry deodorizer in the shiny and - Check the shelves or inner windy place. wall are stained with food juice. - Store the food in the closed - Check the food in the vinyl wraps. container instead of vinyl wraps. - Chedk food cleanliness. - Clean the refrigerator and set button at strong. Plastic Odor. Odors of mixed food and plastic - Check wet food is wrapped with - Clean the refrigerator. odors. plastic bowl and bag. - Persuade customers not to use - It happens in the new refrigerator. plastic bag or wraps with wet food or odorous foods. Odor from the Odor from the old deodorizer. - Check the deodorizer odors. - Dry the deodorizer with dryer and *Deodorizer : option deodorizer.then in the shiny and windy place. - Remove and replace the deodorants.
2-9. MicomTROUBLE DIAGNOSIS -97- Problems Symptom Causes Checks Measures Remarks Bad PCB All display Bad connection Bad connector Visual check on connector Reconnect electric power. LEDS are off. between Main PCB connection from main connection. connector. and display circuit. PCB to display PCB. Defective PCB trans. PCB Trans winding is Check resistance of PCB Trans Replace PCB Trans Applicable to cut. input and output terminals with or PCB. model without PCB Trans temperature a tester. (If resistance is infinity, dispenser. fuse is burnt out. trans winding is cut). DefectivePCB electric Defective regulator IC Check voltage at input/output Replace regulator. Refer to electric circuit parts. (7812, 7805). terminals. circuit in circuit explanation. PCB electric terminal Check fuse in PCB electric Replace PCB fuse. fuse is burnt out. terminal with a tester. STR Parts are Check if STR No. 2 and 3 pins Replace parts. Applicable to damaged. are cut when power is off. model with dispenser. Abnormal Bad connection Lead Wire connecting Check Lead Wire terminals Reconnect Lead display LED between Main PCB main PCB and display connecting Main PCB and Wire and directly operation and display circuit. PCB is cut or connector display PCB with a tester. connect defective terminal connection is contact terminal to bad. Lead Wire. Defective LED Defective LED. Check if all LEDs are on when Replace display Refer to display module. Main PCB Test switch is PCB. circuit in circuit pressed (or when both freezer explanation. key and power freezer key are pressed at the same time for more than one second.)
TROUBLE DIAGNOSIS -98- Problems Symptom Causes Checks Measures Remarks Bad cooling. Freezer Compressor does Compressor Lead Wire Check compressor Lead Wire Reconnect Lead temperature is not start. is cut. with a tester. Wire. high. Defective compressor Measure voltage at PCB CON1 Replace relay Refer to load driving relay. (5&7) after pressing main PCB (RY1) or PCB. driving circuit in test switch once. It is OK if circuit voltage is normal. explanation. Defective freezer Defective Freezer Check resistance of freezer Replace freezer Refer to sensor. sensor parts. sensor with a tester. sensor. resistance characteristics table of sensor in circuit Freezer sensor is Confirm the color of sensor in Repair main PCB explanation. substituted for other circuits (main PCB sensor sensor housing sensor. housing). Defective freezer fan Fan motor lead wire Check fan motor lead wire Reconnect lead motor. is cut. with a tester. wire. • Defective door switch Measure the voltage between • Replace door Refer to load (freezer, refrigerator, PCB power blue line and fan switch (freezer, driving circuits in home bar). motor after pressing test switch refrigerator and circuit • Defective fan motor. of Main PCB. If the voltage is home bar). explanation. • Defective fan motor normal, it is OK.• Replace fan motor. driving relay. Faulty defrost. Refer to faulty defrost items in trouble diagnosis Refer to trouble functions. diagnosis function.
TROUBLE DIAGNOSIS -99- Problems Symptom Causes Checks Measures Remarks Bad cooling Wrong Defective AC Damper. Check AC damper Check if AC damper motor and Reconnect lead Refrigerator motor and reed switch reed switch lead wire are wire. temperature. and lead wire are cut. cut with a tester. Check AC damper Refer to AC damper in parts Replace AC damper part. repair guide. or refrigerator control box Assembly. Check AC damper Refer to AC damper in parts Replace relay or Refer to single Motor driving relay in repair guide. PCB. motor damper PCB.driving circuits in circuit explanation. Foreign materials in AC Check AC damper baffle Remove foreign damper baffles visually. materials. Ice formation on AC Check if AC damper Heater Replace AC damper damper baffles wire is cut with a tester. or refrigerator control Box Assembly. Defective refrigerator Defective refrigerator Check the resistance of Replace refrigerator Refer to sensor sensor sensor parts. refrigerator sensor with a tester. sensor. resistance characteristic table in circuit explanation. Refrigerator sensor is Check the sensor color in the Repair main PCB substituted for other circuit. (main PCB sensor sensor housing. sensor. housing.) Defective refrigerator Check if refrigerator sensor Fix again the sensor assembly is not fixed at cover sensor but refrigerator sensor. condition. inner case visually.
TROUBLE DIAGNOSIS - 100 - Problems Symptom Causes Checks Measures Remarks Bad defrost. Defrost is not Defrost lead wire is cut. Check if defrost lead wire is cut with a Reconnect Lead working. tester. Wire. Defective defrost driving relay. Check the voltage of CON2 Replace relay Refer to load with a tester after pressing main or PCB. driving conditions PCB test switch twice. check in circuit If the voltage is normal then it is OK. explanation. Defective defrost sensor parts. Check the resistance of defrost sensor Replace defrost Refer to sensor with a tester. sensor. resistance characteristic table of circuit explanation. Defective Buzzer Defective connecting lead wire from Check lead wire related to door Repair lead wire. buzzer continuously main PCB to door switch. switch with a tester. rings or door Defective door switch parts. Refer to door switch in parts repair Replace door switch. opening alarm guide. does not work. Defective Buzzer does Key input wire is cut or bad connector Check input wire with a tester. Reconnect lead Refer to display display button not ring and terminal contact in main PCB and wire and replace or circuit in circuit key does not display PCB connecting lead wire. directly connect bad explanation. sense even contact terminal to button is lead wire. pressed. Key is continuously depressed due to Disassemble frame display and confirm Adjust or replace structural interference. visually. interfering structures.