http://biz.lgservice.com REFRIGERATOR SERVICE MANUAL CAUTION BEFORE SERVICING THE UNIT, READ THE "SAFETY PRECAUTIONS" IN THIS MANUAL.
CONTENTS SAFETY PRECAUTIONS .............................................................................................................................................. 2 SERVICING PRECAUTIONS ......................................................................................................................................... 3 SPECIFICATIONS ...........................................................................................................................................................
SERVICING PRECAUTIONS Features of refrigerant (R600a) • Achromatic and odor less gas. • Flammable gas and the ignition (explosion) at 494°C. • Upper/lower explosion limit: 1.8%~8.4%/Vol. Features of the R600a refrigerator • Charging of 60% refrigerant compared with a R134a model • The suction pressure is below 1bar (abs) during the operation. • Because of its low suction pressure, the external air may flow in the cycle system when the refrigerant leak, and it causes malfunction in the compressor.
SPECIFICATIONS 1.Ref.
PARTS IDENTIFICATION Door Swich Utility Corner (movable) Rotatable Door Basket (3 or 5) Removable Glass Shelf(2 or 3) Lamp Multi-air Flow Duct Egg Tray Tray Meat (Optional) Refrigerator Temperature Control Vegetable Drawer Used to keep fruits and vegetables, etc. fresh and crisp. Handle 2 Bottle Door Basket Ice Cube Tray Freezer Compartment Removable Plinth Leveling Screw NOTE : This is a basic model. The shape of refrigerator is subject to change.
REPLACEMENT OF DOOR OPENING TYPE Precaution 1. Before reversing the door, first of all, you should take out food and accessories like shelves or trays which arenot fixed in the fridge-freezer. 2. Use Torque Wrench or Spanner to fix or remove the bolt. 3. Do not lay the fridge-freezer down. This will cause problems. 4. Be careful not to drop the doors in disassembling or assembling. How to Reverse the Door 1. Separate the screw 18 19 17 20 22 21 4.
DISASSEMBLY 1. DOOR 2. DOOR SWITCH 1) Using the driver remove two small cap of the front. 2) Loosen four screws in upper part and disconnect top cover. • Freezer Door 1) Loosen 2 screws and pull the Cover Lower. 2) Loosen hexagonal bolts fixing the lower hinge to the body to remove the freezer door only. 3) Disconnect Lead Wire from switch. 4) Disengage hook behind the switch by pressing it with hands. Lower Hinge Bolt Figure 9 Figure 6 3) Pull out the Door Gasket to remove from the Door Foam Assy, F.
4 FAN AND FAN M OTOR 6 DAMPER CONT ROL 1) Remove the Cover Lamp, R and loosen 2 screw. 2) Pull the Control Box, R and separate the lead wire housing. 3) Remove the Cover Lamp, R. 4) Separate the Insulation Multi Duct and Control Box, R. 5) Disassemble the Knob. 1) Remove freezer drawers. 2) Remove two cap, screws and loosen two screws in Grille Fan. 3) Pull out the Grille Fan and Shroud, F. 4) Disconnect the housing of lead wire. 5) Separate the Fan Assy. 6) Losse 2 screw fixed to the Bracket.
ADJUSTMENT 1. COMPRESSOR 3) PTC-Applied Circuit Diagram According to Starting Method for the Motor 1) Role OVERLOAD The compressor intakes low temperature and low PROTECTOR(O.L.P) pressure gas evaporated from Evaporator of the Refrigerator, and condenses this gas to high temperature C and high pressure gas, and then plays delivering role to COMPRESSOR Condenser.
3. OLP (OVER LOAD PROTECTOR) 1) Definition of OLP (1) OLP (OVER LOAD PROTECTOR) is attached to the Hermetic Compressor and protects the Motor by cutting off current in Compressor Motor in case of over-rising temperature by Bimetal in the OLP. (2) When over-voltage flows to Compressor motor, the Bimetal works by heating the heater inside the OLP, and the OLP protects Motor by cutting off current which flows to the Compressor Motor.
TROUBLESHOOTING (Mechanical Part) 1. COMPRESSOR AND ELECTRIC COMPONENTS 1 Power Source. Remove the Relay Assy from the Compressor and measure the voltage between Terminal C of Compressor and Terminals M or S of Relay Assy YES (Rating Voltage ±10%) 2 No Voltage. 5 Advise the customer to use a regular Trans. Applied voltage isn't in the range of Rating Voltage ±10%) 2 3 Check the resistance of Motor Compressor. Check the resistance among M-C, S-C and M-S in Motor Compressor.
2. RELAY ASSY (PTC AND OLP) Check another electric components. Observation value is 220V/50Hz : 22 Ω ±30% 115V/60Hz : 6.8Ω ｱ30% 240V/50Hz : 33 Ω ±30% 127, 220V/60Hz : 22Ω±30% Separate the Relay Assy from Compressor and measure the resistance between M and S with a Tester or Whistone Bridge. (Figure 21) Replace Relay Assy. The resistance value is 0 or serveral hundredsΩ. The value is∞ .
3. ANOTHER ELECTRIC COMPONENTS Cooling is impossible Compressor doesn't run. Running state of Compressor is poor. Check if current flows to the following components. Cause. a. Thermistor Poor contacting. b. Starting devices Shorted or broken. c. OLP Poor contacting or shorted. d. Compressor coil Coil shorted. e. Circuit Parts Poor contacting or shorted. Replace each component. Check a starting voltage. Low voltage. Raise the voltage. Check if current flows to starting devices.
4. SERVICE DIAGNOSIS CHART COMPL A INT POINTS TO B E CHECK ED R E M E DY Cooling is impossible. • Is the power cord unplugged from the outlet? • Check if the power switch is set to OFF. • Check if the fuse of power switch is shorted. • Measure the voltage of power outlet. • Plug to the outlet. • Set the switch to ON. • Replace a regular fuse. • If voltage is low, wire newly. Cooling ability is poor. • Check if the set is placed close to wall.
5. REFRIGERATING CYCLE Troubleshooting Chart TEMPERATURE OF THE COMPRESSOR STATE OF THE SET STATE OF THE EVAPORATOR PARTIAL LEAKAGE Freezer room and Refrigerator don't cool normally. Low flowing sound of Refrigerant is heard and frost forms in inlet only. A little high more than ambient temperature. • A little Refrigerant discharges. • Normal cooling is possible when injecting of Refrigerant the regular amount. WHOLE LEAKAGE Freezer room and Refrigerator don't cool normally.
General Control of Refrigerating Cycle NO. ITEMS WELDING ROD 1 FLUX 2 3 LOKRING (Figure 23,24) 4 DRIER ASM 7 8 (1) H 30 • Chemical Ingredients Ag: 30%, Cu: 27%, Zn: 23%, Cd: 20% • Brazing Temperature: 710~840°C (2) Bcup-2 • Chemical Ingredients Cu: About 93% P: 6.8~7.5% The rest: within 0.2% • Brazing Temperature: 735~840°C • Ingredients and how to make Borax 30% Borax 35% Fluoridation kalium: 35% Water: 4% Mix the above ingredients and boil until they are transformed into liquid.
TUBE LOKRING LOKRING Figure 23. LOKRING ASSEMBLY JAWS BOLT TOOL Figure 24.
MICOM FUNCTION & PCB CIRCUIT EXPLAN ATION This description is made for GA-B359, B399. Please refer to overall PCB circuits for other models. 1 FUNCTION EXPOSITION 1) FUNCTION • The initial Temperature of the Freezer Compartment is -19°C respectively. You can now adjust the temperature of the compartments as you want.
3) SUPER FREEZING (1) It is the function which increases the cooling speed of freezer by continuously operating compressor and freezer fan. When it’s button is pressed, GRAPHIC is on. (2) Whenever selection switch is pressed, selection/release (GRAPHIC on/off) changes in turn. (3) If power is on after power cut, SUPER FREEZING function is canceled. (4) It shall be cancelled after compressor and freezer fan continuously operate for three hours.
5) DEFROSTING (1) If the accumulated time for the operation of the COMPRESSOR is meet with 7 hours, the DEFROSTING HEATER is started. (2) The first defrosting is performed at 4 hours(compressor ON) later since the power is on. (3) If DEFROST SENSOR is over 7°C during DEFROSTING, end the operation of DEFROSTING with DEFROSTING HEATER paused, And after 7 minutes, the operation for the freezing is started.
O : OPERATE NORMAL OPERATION IN TROUBLE'S OCCURRING NO. ITEMS 1 FREEZER SENSOR abnormal FREEZER SENSOR open or short. 15 minutes On/ 15 minutes Off O O 2 DEFROST SENSOR abnormal DEFROST SENSOR open or short. O O No defrosting 3 DEFROSTING FUNCTION is abnormal O O O O O O 4 ERROR CODE LEDs RT-SENSOR abnormal NOTE 1) DESCRIPTION COMP DEFROST HEATER, TEMP. FUSE open or disconnection (Displayed after at least 4 hours from the trouble's occurring.
2 FUNCTION DESCRIPTION 1) ELECTRIC CIRCUITS 11 VA1 14821 9 TRANS secondary side is composed of electric power circuits for RELAY driving electricity (12Vdc) and for supplying electricity to MICOM and IC (5Vdc). The voltage in each part is as follows. PARTS both ends of VA1 VOLTAGE 230Vac both ends of transformer both ends of CE1 both ends of CE2 both ends of CC2 17Vdc 12Vdc 5Vdc 14Vac VA1 is the part to protect over voltage and noise.
4) LOAD/BUZZER OPERATION (1) LOAD OPERATION CHECK 11 9 C 7 D 5 3 E 1 KIND OF LOAD COMP, MEASURING POINT (IC5) STATE FAN MOTOR COMP COOLING FAN No.C DEFROSTING HEATER No.D ON below 1V OFF 12V No.E If the DOOR-R is opened during FAN MOTOR is operated, FAN MOTOR is stopped immediately. The A , B of DOOR S/W-R is connected DOOR OPEN DETECTION CIRCUIT as follow.
5) TEMP SENSOR CIRCUITS A 28.2KF 7 7 8 8 B 28.2KF C 16.2KF The above circuit reads the surrounding temperature, DEFROSTING temperature and FREEZER ROOM temperature into MICOM(IC1). OPEN or SHORT state of each SENSOR is as follows. SENSOR CHECK POINT ROOM TEMPERATURE SENSOR POINT Voltage DEFROST SENSOR POINT Voltage FREEZER SENSOR POINT C NORMAL (-30°C~50°C) SHORT OPEN 0.5V ~ 4.
7) TEMPERATURE COMPENSATION FREEZER ROOM RESISTANCE VALUES(R1) TEMPERATURE COMPENSATION 180 k Ω + 5. 0° C 56 k Ω +4.0°C 33 k Ω +3.0°C 18 k Ω +2.0°C 12 k Ω +1.0°C 10 k Ω 0° C 8.2 k Ω -1.0°C 5.6 k Ω -2.0°C 3.3 k Ω -3.0°C 2 kΩ -4.0°C 470 Ω -5 . 0 ° C REMARKS C O MP E N S A T E W A R ML Y S T ANDAR D C O MP E N S A T E C O O L L Y • TEMPERATURE COMPENSATION TABLE by adjusting resistance values. (the temp difference compared to the present temp.
• TEMPERATURE COMPENSATION OF FREEZER ROOM Revised resistance 470Ω 2kΩ 3.3kΩ 5.6kΩ 8.2kΩ 10kΩ 12kΩ 18kΩ 33kΩ 56kΩ 180kΩ 470Ω NOT COMPENSATE 1°C↑ 2°C↑ 3°C↑ 4°C↑ 5°C↑ 6°C↑ 7°C↑ 8°C↑ 9°C↑ 10°C↑ 2kΩ 1°C↓ NOT COMPENSATE 1°C↑ 2°C↑ 3°C↑ 4°C↑ 5°C↑ 6°C↑ 7°C↑ 8°C↑ 9°C↑ 3.3kΩ 2°C↓ 1°C↓ NOT COMPENSATE 1°C↑ 2°C↑ 3°C↑ 4°C↑ 5°C↑ 6°C↑ 7°C↑ 8°C↑ 5.6kΩ 3°C↓ 2°C↓ 1°C↓ NOT COMPENSATE 1°C↑ 2°C↑ 3°C↑ 4°C↑ 5°C↑ 6°C↑ 7°C↑ 8.
3. SENSOR RESISTANCE CHARACTERISTICS TABLE MEASURED TEMPERATURE RESISTANCE OF FREEZER SENSOR RESISTANCE OF DEFROST SENSOR, ROOM TEMPERATURE SENSOR -2 0 ° C 2 2 . 3 kΩ 77k Ω -1 5 ° C 1 6 . 9 kΩ 60k Ω -1 0 ° C 1 3 . 0 kΩ 47.3k Ω -5 ° C 1 0 . 1 kΩ 38.4k Ω 0° C 7 . 8 kΩ 30k Ω +5 ° C 6 . 2 kΩ 24.1k Ω +1 0 ° C 4 . 9 kΩ 19.5k Ω +1 5 ° C 3 . 9 kΩ 15.9k Ω +2 0 ° C 3 . 1 kΩ 13k Ω +2 5 ° C 2 . 5 kΩ 11k Ω +3 0 ° C 2 . 0 kΩ 8.9k Ω +4 0 ° C 1 . 4 kΩ 6.2k Ω +5 0 ° C 0 . 8 kΩ 4.
2) REPLACEMENT PARTS LIST 06 05 04 03 02 01 W O R K Q TY Q TY Q TY Q TY Q TY Q TY NO. 1 1 1 1 1 1 1 1D 1D 1J 1G 2 1 1 1 1 3 D E S C R IPTION SPEC' MAKER REMARK PWB,MAIN FR-1(DS-1107A) SUZHONGDAZHAN JIANGSULING K .T .C T A E SU N G t=1.
3) P CB ASS'Y, DISPLAY AND PARTS LIST 03 02 01 WORK Qty Qty Qty No.
5. PCB assembly,MAIN circuit drawing- The PCB assembly,MAIN circuit drawing may change without notice. CON1 11 N XOUT POWER 9 Vcc 28 XIN L 3 TEST RESET 27 3 KIA7042 1 2 6 7 COMP 4 P76 17 5 P10 26 7 FAN 5 P66 20 OP1 P11 25 3 8 HEATER 21 6 7 1 P65 (AIN5) P64 (AIN4) P63 (AIN3) P12 P13 P14 P15 P16 OP2 24 23 22 21 20 TO DISP CON2 3 RF1 16.2K 1 15 2 RF2 26.1K 16 2 D-SENSOR 2 A 3 RF3 29.
6. PCB assembly,display circuit drawing- The PCB assembly,display circuit drawing may change without notice. K3 3 10K K4 4 10K A R5 10K R25 2K CE13 104 R23 2K R24 2K 3 P06 8 103 4 P07 9 103 5 P60 R30 6 P61 10K 6 4.
EXPLODED VIEW & REPLACEMENT PARTS LIST Ref. No : GA-B409U*QA/B379U*QA The parts of refrigerator and the shape of each part are subject to change in different localities.
Ref.
Ref.
P/NO:3828JS8029F
