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30
4. TROUBLESHOOTING
4-1) Check items before failure diagnosis4-1-1. TEST mode (Manual operation / Manual defrost function)
If the Power Freeze and Fridge Key on the front panel are pressed simultaneously for 8 seconds, it will bechanged to the Test Mode and all display on the front panel will be off.
If any key on the front panel is pressed within 15 seconds after changing to Test Mode, it will be operated asbelow sequence; Manual operation (FF) Manual defrost of R (rd) Manual defrost of F/R (Fd) Cancel(Display all off).
If any key on the front of panel is not pressed within 15 seconds after the Test Mode, the Test Mode will becanceled and it will be returned to previous mode.
If Power Freeze Key + Fridge Key are pressed simultaneously for 8seconds and all displays are off, it will be changed to the Test Mode (manual operation)
pressing any key.
1-1) If any key is pressed once in TEST MODE, "FF" blinks on the display and it indicates therefrigerator has entered the manual operation. At this moment, buzzer beeps as an alarm.
1-2) If manual function is selected, compressor will run at once without 5 minutes delay in any mode. Ifthe refrigerator is on the defrost cycle at the moment, defrost will be stopped and manual operationwill begin. (Be careful, if manual operation gets started immediately at the moment of compressoroff, overload could be occurred.)
1-3) If manual operation works, compressor & F-FAN operate continuously for 24 hours and fresh foodcompartment will be controlled by the setting temperature.
1-4) When the manual operation runs, setting temperature will be selected automatically as below ;Freezer compartment -14(-25), Fresh food compartment 32(1).
1-5) During manual operation Power Freeze & Power Cool function will not be worked. If a function isselected, the power function icon of the selected one will be off automatically after 10 seconds.
1-6) Manual operation can be canceled during manual operation by turning on the appliance afterpower off(resest) or choosing the following step 4) test cancel mode.
1-7) When the manual operation runs, alarm (0.25 seconds ON/0.75 seconds OFF) will beepcontinuously until manual operation is completed and there is no function to make the sound stop.
1) Manual operation function
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TROUBLESHOOTING
2-1) If any key is pressed one more time during manual operation (Fresh food compartment), "rd"shows in the display and then manual operation will be canceled at once and fresh foodcompartment will be defrosted.
2-2) At this moment, alarm beeps for 3 seconds from the beginning, and then beeps 0.1 sec ON/ 1 secOFF during manual defrost (Fresh food compartment) function.
2) Manual defrost (R : Fresh food compartment) function
3) Manual defrost (R & F : Fresh food & Freezer compartment) function
3-1) If any key is pressed one more time during manual defrost (defrost of fresh food compartment,"rd") "Fd" shows on the display and then fresh food and freezer compartments defrost will operate.Simultaneous manual defrost of Fresh food and Freezer compartment is on the extension of freshfood compartment, and when it begins, it operates by comparing the temperature of FreezerHeater ON, not compare the temperature of fresh food Heater ON separately, That is, in case ofmanual defrost of fresh food, it is the Heater On condition and if the simultaneous manual defrostof fresh food and freezer compartment key before completing deforest, it does not make fresh foodcompartment heater OFF by re-comparing the temperature of fresh food compartment EVA.
3-2) At this time, alarm beeps for 3 seconds from the beginning, and then beeps 0.5 sec. ON/ 0.5sec.OFF during manual defrost function of fresh food and freezer compartment.
4) Test cancel mode4-1) During defrosting of fresh food and freezer compartments simultaneously, if the display panel
changes to the test mode and test button is pressed one more time, defrosting of fresh food andfreezer compartments will be canceled at the same time and will return to the normal operation. Or,all test functions will be canceled by turning main power ON and OFF.
1) Self-diagnostic function in the initial power ON.1-1) Micom operates self-diagnostic function to check the temperature sensor condition within 1 second
when the refrigerator turned On initially.1-2) If bad sensor is detected by the self-diagnostic function, the all applicable display LED will blink for
0.5-second interval. At this moment, there is no beep sound.(Refer to self-diagnostic CHECK LIST)
1-3) Self-diagnostic button is recognized only when the error is displayed by the bad sensor. Displaydoes not operate normally but temperature control will be controlled by the emergency operation.
1-4) When the error is detected by self-diagnosis, the error can be canceled automatically if all troubledsensors are corrected or Self-diagnostic function key (Power Freeze + Power Cool) are pressedsimultaneously for 8 seconds. (Return to normal display mode)
4-1-2. Self-diagnostic function
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TROUBLESHOOTING
If Power Freeze Key + Power Cool Key are pressed simultaneously for 8 seconds,the error mode by self-diagnosis will be canceled.
2) Self-diagnostic function during normal operation
2-1) If Power Freeze Key + Power Cool Key are pressed simultaneously for 6 seconds during normaloperation, the temperature setting display will operate for 2 seconds (ALL ON/OFF 0.5 sec each).If Power Freeze Key + Power Cool Key are pressed simultaneously for 8 seconds (including above2 seconds), self-diagnostic function will be selected.
2-2) At this moment, self-diagnostic function will be returned with buzzer sound 'ding-dong'. If there isan error, display of error will be operated for 30 seconds and then return to normal conditionwhether problem is corrected or not. (Buzzer sounds 'ding-dong') (Refer to self-diagnosis CHECK LIST).
2-3) Input by button is not acceptable during self-diagnostic function.
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TROUBLESHOOTING
Self-diagnosis CHECK LIST
NO
1
2
3
4
5
6
7
8
9
10
Trouble item
R-Sensor Error
R-DEF-Sensor Error
R-FANError
R-DEF. - Heater Error
Ambient-Sensor Error
F-Sensor Error
F-DEF-Sensor Error
F-FAN Error
C-FAN Error
F-DEF. - Heater Error
Display LED
R-1-
R-1-
R-1-
R-1-
F-1-
F-1-
F-1-
F-1-
F-1-
F-1-
Trouble contents
R SENSOR part error.
R defrost SENSOR part error.
R inner fan motor part error.
R defrost part error.
External SENSOR part error.
F SENSOR part error.
F defrost SENSOR part error.
F inner fan motor part error.
Machine room fan motor part error.
F defrost part error.
F-10 F-1 R-10 R-1
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TROUBLESHOOTING
Self-diagnostics check listLED Item
R-1-
R-1-
R-1-
R-1-
F-1-
F-1-
F-1-
F-1-
F-1-
F-1-
R-Sensor Error
R-DEF-Sensor Error
R-FAN Error
R-DEF. Error
Ambient-Sensor Error
F-Sensor Error
F-DEF-Sensor Error
F-FAN Error
C-FAN Error
F-DEF. Error
Display error : In case of Separation ofsensor housing part, contact error,disconnection, short circuit.Display error by temperature : when thesensing temperature is more than 149(+65) or less than -58(-50).
Display error : In case of separation ofdefrost heater housing, contact error,disconnection, short circuit, or temperaturefuse error.Display error : If defrost does not finishthough the defrost of fresh foodcompartment is heating continuously formore than 80 minutes.
Display error : In case of separation ofsensor housing parts, contact error,disconnection, short circuit.Display error by temperature : When thesensing temperature is more than 149(+65) or less than -58(-50).
Display error : In case of Feed Backsignal line contact error, separation ofmotor wire, motor itself error duringoperation of applicable fan motor.
When checking the voltage of MAIN PCBCN30 #3 #8 : Shall be between4.5V~1.0V.
When checking the voltage of MAIN PCBCN30 #4 #8 : Shall be between4.5V~1.0V.
When checking the voltage of MAIN PCBCN31 #1 #3 : Shall be between4.5V~1.0V.When checking the voltage of MAIN PCBCN30 #5 #8 : Shall be between4.5V~1.0V.When checking the voltage of MAIN PCBCN30 #6 #8 : Shall be between4.5V~1.0V.
Voltage of MAIN PCB CN76 Pink Gray :Shall be between 7V~12V.
Voltage of MAIN PCB CN76 Blue Gray :Shall be between 7V~12V.
Voltage of MAIN PCB CN76 Yellow Gray : Shall be between 7V~12V.
After separating MAIN PCB CN72 wire from PCB, the checked resistance value of CN70 White Orange shall be103/397ohm 10% (Resistance value isvaried by input power) Model withoutIce maker (120ohm 10%) Check 0 Ohmfor heater short, &Ohm for wire / bimetalOpen.
After separating MAIN PCB CN72 wire from PCB, the checked resistance value of CN70 Brown Orange shall be 66/240 ohm 10%.(Resistance value is varied by input power)Check 0 Ohm for heater short, &Ohm forwire / bimetal Open.
Display error : In case of Feed Back signal linecontact error, separation of motor wire, motor itselferror during operation of applicable fan motor.Display error : In case of Feed Back signal linecontact error, separation of motor wire, motor itselferror during operation of applicable fan motor.
Trouble contents Diagnostic method
Fresh food Compartment
Display error : In case of separation ofdefrost heater housing, contact error,disconnection, short circuit or temperaturefuse error.Display error : If defrost does not finishthough the defrost of freeze compartmentis heating continuously for more than 70minutes.
Freeze Compartment
NW2()-AC 2010.5.22 9:2 AM 34 in
If Power Freeze Key + Power Cool Key are pressed simultaneously for 6 seconds, All ON/OFF will blink at 0.5 second intervals for 2 seconds.
If taking the finger off from the keys when above blinking condition and press Fridge Key, load condition mode will be started.
1) If Power Freeze Key + Power Cool Key are pressed simultaneously for 6 seconds, ALL ON/OFF willblink at 0.5 second intervals for 2 seconds.
2) At this moment, if taking the finger off from Power Freeze Key + Power Cool Key and pressing FridgeKey, load condition display mode will be returned with alarm ("Ding-dong").
3) Load condition display mode shows the load that MICOM signal is outputting. But, it means that MICOMsignal is outputting and does not means whether load is operating or not actually. That is, though loadoperation is displayed, load could not be operated by actual load error, PCB relay error, or etc. And thisfunction would be applied at Service (A/S).
4) Load condition display function will maintain for 30 seconds and then normal condition will be returnedautomatically.
5) Load condition display is as below.
35
4-1-3. Display function of Load condition
TROUBLESHOOTING
F-10 F-1 R-10 R-1
NW2()-AC 2010.5.22 9:2 AM 35 in
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TROUBLESHOOTING
Load mode Check list
Display LED
R-1-
R-1-
R-1-
R-1-
R-1-
R-1-
R1-
F-1-
F-1-
F-1-
F-1-
R-10-
R-10-
Display contents
R-FAN High
R-FAN Low
R-DEF Heater
Start Mode
Overload condition
Low temperature condition
Normal Condition
Exhibition Mode
COMP.
F-FAN High
F-FAN Low
F-DEF Heater
C-FAN High
C-FAN Low
Operation contents
When fresh food compartment FAN High operates, applicable LED ON.
When fresh food compartment FAN Low operates, applicable LED ON.
When fresh food compartment defrost heater operates, LED ON.
When initial power applied to refrigerator, LED ON.
When ambient temperature is more than 93(34), LED ON.
When ambient temperature is less than 72(22), LED ON.
When the ambient temperature is between 73(23) ~ 91(33).
F-1-,ALL LED Off
At the display mode, LED ON.
When compressor operates, applicable LED ON.
When freezer FAN High operates, applicable LED ON.
When freezer FAN Low operates, applicable LED ON.
When freezer defrost heater operates, LED ON.
When compressor FAN High operates, applicable LED ON.
When compressor FAN Low operates, applicable LED ON.
NW2()-AC 2010.5.22 9:2 AM 36 in
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4-1-4. Display / Exhibition mode setting function
4-1-5. Option setting function
If Freezer Key + Power Cool Key are pressed simultaneously for 12 seconds during normal operation,fresh food and freezer compartments temperature display will be changed to option setting mode.
TROUBLESHOOTING
1) If Power Freeze Key + Freezer Key are pressed simultaneously for 3 seconds during normal operation,exhibition / display mode will be started with buzzer sound ("Ding-dong").
2) If above Power Freeze Key + Freezer Key are pressed repeatedly, exhibition / display mode will becanceled.
3) If exhibition / display mode is selected, "OF-OF" blinks on the temperature setting display of the paneland it indicates the refrigerator has entered the exhibition / display mood.
4) If fresh food and freezer compartments sensors are higher than 149(65) during exhibition / displaymode, exhibition / display mode will be canceled automatically and cooling operation will be returned.(There is no buzzer sound when the exhibition/display mode is canceled by the temperature.)
5) Operation contents of exhibition/display mode-. All function like display, fan motor, etc operate normally, but only compressor does not operates.-. Defrost is not operated.-. Display function of initial actual temperature is finished.-. Exhibition/Display mode will be operated though Power ON after Power OFF under the
exhibition/Display mode condition.
If Power Freeze Key + Freezer Key are pressed for 3 seconds,exhibition / display mode will be started.
NW2()-AC 2010.5.22 9:2 AM 37 in
38
1) For example, if you want to change freezer compartment standard temperature to -4 (-2) byoperating option, do as following. This function is for changing the standard temperature. In -2(-19)of current temperature of freezer compartment, if you make the temperature lower to 28.4(-2) by theoption, the standard temperature would be controlled -6(-21). Therefore, if you changed the settingof temperature option to -2(-19) on the panel, the appliance will be operated with -6(-21). Itmeans that standard temperature is controlled 28.4(-2) less than setting temperature in the display.
TROUBLESHOOTING
Code Reference Value
Key control in option modePower Freeze Key
Freezer KeyPower Cool key
Fridge key
Code Down keyCode Up key
Reference Value down keyReference Value Up key
If the display changes to option setting mode, all displays will be off except freezer and fresh foodcompartments temperature display as below. (Fresh food and freezer compartments is explained onlybecause all options are operated with the same method according to the option table.)
Basically, option function has cleared data at shipping process. Therefore, all setting value are"0". But, check the quality information manual or specifications, because setting value could bechanged particularly for the purpose of improving quality at mass producing process.NOTE
If Freezer Key + Power Cool Key are pressed simultaneously for 12seconds, option setting mode will be started.
Code Up ReferenceValue Up
CodeDown
ReferenceValue Down
ReferenceValueCode
Key control method after changing to option mode.
NW2()-AC 2010.5.22 9:2 AM 38 in
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TROUBLESHOOTING
2) After changing to the option mode, fresh food compartment "0", freezer compartment "0" will bedisplayed. (Basically, fresh food compartment "0", freezer "0" would be set at shipping process, butsetting value could be changed for the purpose of improving quality at mass producing process.)- If fresh food compartment "0" shows only, temperature reference value of freezer compartment will be
set and current freezer compartment temperature code will be displayed on the freezer temperaturedisplay.
3) If freezer compartment "4" is set as below freezer compartment code after fresh food compartment "0" isset, standard temperature of freezer compartment will be lower than 28.4(-2.0).(Refer to the picture"Changing the freezer compartment temperature")
4) Option changing method as above is the same as all LMF model.5) Option function is set in the EEPROM at shipping process in the factory. You would better not to change
the option of your own. Completing the setting is that option function return to normal display after 20seconds. Do not turn off the appliance before returning to the normal display mode.
: If you wait for 20 seconds after completing the setting, MICOM will save the setting value to theEEPROM and normal display will be returned and the option setting mode will be canceled.
Code Reference Value
Option setting function exists in the other items. We will skip the explanation of the otherfunctions by the option because it is associated with refrigerator control function and is notneeded at SERVICE.(Please do not set the other options except above SERVICE Manual.)
NOTE
NW2()-AC 2010.5.22 9:2 AM 39 in
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TROUBLESHOOTING
4-1-6. Option TABLE
Reference ValueCode
1) Temperature changing table of freezer compartment
ex) If you want to change the freezer standardtemperature to -28.4(-2C)
Setting ITEM Freezer Temp ShiftFridge Room 7-SEG
0
Setting value
Temp.compensation
0123456789101112131415
32(0.0)31.1(-0.5)30.2(-1.0)29.3(-1.5)28.4(-2.0)27.5(-2.5)26.6(-3.0)25.7(-3.5)32.9(+0.5)33.8(+1.0)34.7(+1.5)35.6(+2.0)36.5(+2.5)37.4(+3.0)38.3(+3.5)39.2(+4.0)
FreezerCompartment
Code
ReferenceValue
Reference ValueCode
2) Temperature changing table of fresh food compartment
ex) If you want to change the freezer compartmentstandard temperature to 35.6(2C).
Setting value Fridge Temp ShiftFridge Room 7-SEG
1
Setting value
Temp.compensation
0123456789101112131415
32(0.0)31.1(-0.5)30.2(-1.0)29.3(-1.5)28.4(-2.0)27.5(-2.5)26.6(-3.0)25.7(-3.5)32.9(+0.5)33.8(+1.0)34.7(+1.5)35.6(+2.0)36.5(+2.5)37.4(+3.0)38.3(+3.5)39.2(+4.0)
Freezercompartment
Code
ReferenceValue
NW2()-AC 2010.5.22 9:2 AM 40 in
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TROUBLESHOOTING
4-2) Diagnostic method according to the trouble symptom(Flow Chart)DATA1.Temperature tableResistance value and MICOM port voltage of sensor according to the temperatureSENSOR CHIP : based on PX41C
-50-49-48-47-46-45-44-43-42-41-40-39-38-37-36-35-34-33-32-31-30-29-28-27-26-25-24-23-22-21-20-19-18-17-16-15-14-13-12-11-10-9-8-7-6
-58-56.2-54.4-52.6-50.8-49
-47.2-45.4-43.6-41.8-40
-38.2-36.4-34.6-32.8-31
-29.2-27.4-25.6-23.8-22
-20.2-18.4-16.6-14.8-13
-11.2-9.4-7.6-5.8-4
-2.2-0.41.43.25
6.88.610.412.214
15.817.619.421.2
4.6944.6774.6594.6414.6224.6024.5814.5604.5374.5144.4904.4654.4394.4124.3854.3564.3264.2964.2644.2324.1994.1654.1294.0934.0564.0183.9803.9403.8993.8583.8163.7733.7293.6853.6403.5943.5483.5013.4533.4053.3563.3073.2583.2083.158
15331914479413679812929412224811563110941310356998073929038803783456791427507771246676346422761012579775511252406498484743145146429844093839002371693543333788322303075229350280212676025562244252334522320213452041819537186981790117142
Voltage Resistance-5-4-3-2-10123456789101112131415161718192021222324252627282930313233343536373839
2324.826.628.430.232
33.835.637.439.241
42.844.646.448.250
51.853.655.457.259
60.862.664.466.268
69.871.673.475.277
78.880.682.484.286
87.889.691.493.295
96.898.6100.4102.2
3.1073.0573.0062.9552.9042.8532.8022.7512.7002.6492.5992.5482.4982.4492.3992.3502.3012.2532.2052.1582.1112.0642.0191.9741.9291.8851.8421.7991.7571.7161.6751.6361.5961.5581.5201.4831.4471.4121.3771.3431.3091.2771.2531.2131.183
164191573115076144521385713290127491223311741112711082310395998695969223886785268200788875907305703267716521628160525832562154195225503948614690452643694218407239333799367035473428334432043098
Voltage Resistance404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384
104105.8107.6109.4111.2113
114.8116.6118.4120.2122
123.8125.6127.4129.2131
132.8134.6136.4138.2140
141.8143.6145.4147.2149
150.8152.6154.4156.2158
159.8161.6163.4165.2167
168.8170.6172.4174.2176
177.8179.6181.4183.2
1.1531.1241.0951.0681.0401.0140.9880.9630.9380.9140.8910.8680.8460.8240.8030.7830.7620.7430.7240.7060.6880.6700.6530.6360.6200.6040.5890.5740.5600.5460.5320.5190.5060.4930.4810.4690.4570.4460.4350.4240.4140.4040.3940.3840.375
2997289928052714262725432462238423092237216721002036197319131855179917451693164215941547150214581416137513351297126012251190115711251093106310341006978952926902877854832810
Voltage Resistance
NW2()-AC 2010.5.22 9:2 AM 41 in
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TROUBLESHOOTING
2) If R Sensor has trouble
Bad contact of connector/Insert correctly
Is Main PCBConnector CN30 inserted
correctly?
Is R Sensor unitnormal?
Is the voltage between MainPCB Connector CN30- #3(Red) & REG1,
Heat Sink normal?
Is the input voltage to IC10 MICOM #53
normal?
Start
NO
YES
YES
YES
YES
Replace the temperature sensor
NO
Recheck the wire connection part
NO (0.6V > Measurement < 4.6V)
Check the Cold solder joint, short, solder Touch
NO
No trouble with PCB and temperature sensor.Recheck the bad contact of the connector.
** Measuring point of resistance value accordingto Sensor **
R : CN30 #3 #8 Measure the resistance value** : Short trouble / : Open trouble
Sensor MICOM/Connector number
Voltage is measured between 4.6V ~ 0.6V
Voltage of IC10 MICOM #53 is same with themeasuring voltage of CN30-#3(Red), REG1, & HeatSink from PCB common Ground part. Check the measure on MICOM or Sensor
Marking #1(R301).
DATA1.Temperature Table
ERROR Code
Refer to circuit diagram in the manual
R Connector CN30#6(White) to REG1HEAT-SINK PCB typical Ground
Checking method of R Sensor resistance CN30-#3(White) #8(Gray)-. Compare with the temperature table after
measuring
Checking method of R Sensor voltage.-. Measure the voltage of Sensor Check Point #1(IC10 MICOM
#53) on PCB or CN30-#3(Red) REG1, Heat Sink-. Compare with the temperature table after measuring. Below is
measuring voltage of CN30-#3(Red) REG1, Heat Sink.Common PCBGround of REG1, Heat Sink
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TROUBLESHOOTING
3) If R DEF Sensor has trouble
Bad contact of connector/Insert correctly
Is Main PCB Connector CN30 inserted correctly?
Is R DEF Sensor unit normal?
Is the voltage between Main PCB Connector CN30- #4(Orange) and REG1,
Heat Sink normal?
Is the input voltage of IC10 MICOM # 54
normal?
Start
NO
YES
YES
YES
YES
Replace the temperature sensor
NO
Recheck the wire connection part
NO (0.6V > Measurement < 4.6V)
Check the Cold solder joint, short, solder Touch
NO
No trouble with PCB and temperature sensorRecheck the bad contact of the connector.
** Measuring point of resistance value according toSensor **R-DEF : CN30 #4 #8 Measure the resistance value ** : Short trouble / : Open trouble
Sensor MICOM/Connector Number
Voltage is measured between 4.6V ~ 0.6V
Voltage of IC10 MICOM #54 is same with themeasuring voltage of CN30-#4(Orange), REG1,&Heat Sink from PCB common Ground part. Check the measure on MICOM or, Sensor
Marking #2(R303).
DATA1.Temperature Table
ERROR Code
Refer to circuit diagram in the manual
R DEF Connector CN30-#4(Orange) and REG1Heat-Sink PCB common Ground
Start
YES
YES
YES
Checking method of R DEF Sensor resistanceCN30-#4(Orange) #8(Gray)-. Compare with temperature table after measuring.
Check method of R DEF Sensor voltage-. Measure the voltage of Sensor Check Point #2(IC10 MICOM
#54) on PCB or CN30-#4(Orange) REG1, Heat Sink.-. Compare with temperature table after measuring.
Below is the measuring voltage of CN30-"4"(Orange) REG1, Heat SinkCommon PCBGround of REG1 Heat Sink
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TROUBLESHOOTING
4) If Ambient Sensor has trouble
Bad contact of connector/Insert correctly
Is Main PCBConnector CN31 inserted
correctly?
Is Ambient Sensor unit normal?
Is the voltage between Main PCB Connector CN31-#1(White) and REG1,
Heat Sink normal?
Is the input voltage of IC10 MICOM #59
normal?
Start
NO
YES
YES
YES
YES
Replace the temperature sensor
NO
Recheck the wiring connection
NO (0.6V > Measurement < 4.6V)
Check the Cold solder joint, short,solder touch.
NO
No trouble with PCB and temperature sensor.Recheck the bad contact of the connector.
** Measuring point of resistance value according toSensor **Ambient : CN31#1 #3 Measure the resistance value ** Placed in the right top table of upper hinge.** : Short trouble / : Open trouble
Sensor MICOM/Connector number
Voltage measured between 4.6V ~ 0.6V.
Voltage of IC10 MICOM #59 is same with themeasuring voltage of CN31-#1(White), REG1, &Heat Sink from PCB common Ground part. Check the measure on the MICOM or, Sensor
Marking #5(R309).
DATA1.Temperature table
ERROR Code
Refer to circuit diagram in the manual
Ambient Connector CN31-#1(White) and REG1Heat-Sink PCB common Ground
Start
YES
YES
YES
Checking method of Ambient Sensor resistanceCN31-#1(White) #3(White)-. Compare with the temperature table after
measuring.
Checking method of Ambient Sensor voltage-. Measure the voltage of Sensor Check Point #5(IC10 MICOM
#59) on PCB or CN31-"1"(White) REG1, Heat Sink.-. Compare with the temperature table after measuring.
Below is the measuring voltage of CN31- #"1(White) REG1, Heat SinkCommon PCBGround of REG1 Heater Sink
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TROUBLESHOOTING
5) If F Sensor has trouble
BAd contact of connector / Insert correctly
Is Main PCB ConnectorCN30 inserted correctly?
Is F Sensor unit normal?
Is the voltage between Main PCB Connector CN30-#5(Yellow) and REG1,
Heat Sink normal?
Is the input voltage of IC10 MICOM #57 normal?
Start
NO
YES
YES
YES
YES
Replace temperature sensor
NO
Recheck the wiring connection
NO (0.6V > Measurement < 4.6V)
Check Cold solder joint, Short, solder Touch
NO
No trouble with PCB and temperature sensor.Recheck the bad contact of the connector.
** Measuring point of resistance value according toSensor **F : CN30 #5 #8 Measure the resistance value** : Short trouble / : Open trouble
Sensor MICOM/Connector number
Voltage is measure between 4.6V ~ 0.6V
Voltage of IC10 MICOM #57 is same with themeasuring voltage of CN31-"5"(Yellow), REG1, &Heat Sink from PCB common Ground part. Check the measure on MICOM or, SensorMarking #3(R305).
DATA1.Temperature table
ERROR Code
Refer to circuit diagram in the manual
F Connector CN30-#5(Yellow) and REG1 Heat-Sink PCB common Ground
Start
YES
YES
YES
Checking method of F Sensor resistanceCN30-#5(Yellow) #8(Gray)-. Compare with the temperature table after
measuring.
Checking method of F Sensor voltage-. Measure the voltage of Sensor Check Point #3(IC10 MICOM
#57) on PCB or CN30-#5(Yellow) REG1, Heat Sink.-. Compare with the temperature table after measuring.
Below is the measuring voltage of CN30-"5"(Yellow) REG1, Heat Sink.common PCBGround of REG1 Heater Sink
NW2()-AC 2010.5.22 9:2 AM 45 in
46
TROUBLESHOOTING
6) If F DEF Sensor has trouble
Bad contact of connector/Insert correctly
Is Main PCB ConnectorCN30 inserted correctly?
Is F DEF Sensor unit normal?
Is the voltage between Main PCB Connector CN30-#6(Pink) and REG1,
Heat Sink normal?
Is the input voltage of IC10 MICOM #58 normal?
Start
NO
YES
YES
YES
YES
Replace temperature sensor
NO
Check the wiring connection.
NO (0.6V > Measurement < 4.6V)
Check Cold solder joint, Short, Solder Touch
NO
No trouble with PCB and temperature sensor.Recheck the bad contact of the connector.
** Measuring point of resistance value accordingto Sensor **F-DEF : CN30 #6 #8 Measure the resistance value ** : Short trouble / : Open trouble
Sensor MICOM/Connector number
Voltage is measured between 4.6V ~ 0.6V
Voltage of IC10 MICOM #58 is same with themeasuring voltage of CN30-"6"(Pink) and REG1, & Heat Sink from PCB common Ground part. Check the measure on MICOM or, Sensor
Marking #4(R307).
DATA1.Temperature table
ERROR Code
Refer to circuit diagram in the manual
F DEF Connector CN30-#6(Pink) and REG1 Heat-Sink PCB commonGround
Start
YES
YES
YES
Checking method of F DEF Sensor resistanceCN30-#6(Pink) #8(Gray)-. Compare with the temperature table after
measuring.
Checking method of F DEF Sensor voltage-. Measure the voltage of Sensor Check Point #4(IC10 MICOM
#58) on PCB or CN30-"6"(Pink) REG1, Heat Sink.-. Compare with the temperature table after measuring.
Below is the measuring voltage of CN30-"6"(Pink) REG1, Heat SinkCommon PCBGround of REG1 Heater Sink
NW2()-AC 2010.5.22 9:2 AM 46 in
47
TROUBLESHOOTING
-. The refrigerator of this model has BLDC FAN moror. BLDC motor is driven by DC 7~12V.-. On the normal condition of COMP ON, it operates together with F-FAN motor.
If door is opened and closed once at a high ambient temperature, it will be operated after 1 minute delay.Therefore, you are advised not to taken it for an error.
-. If there is a trouble, you should select the self-diagnostic function to check the trouble before power off.
4-2-1. If FAN does not operate (F, R, C - FAN)
Start
Is COMPRESSORON?
Door & MICOM State
Door
F FAN pulse voltageCN76- #2(Pink)
Common PCB GroundREG1 Heater Sink
The voltage is measured around 2~3V withmulti-meter, though the voltage is changedbecause of pulse signal.
Display for checking the self-diagnostic functionR FAN ERROR
FMICOM(#60)
CloseOpen
0V(High)5V(Low)
0V(Low)5V(High)
R MICOM (#52)
Execute manualoperation
FAN works normally
Repair the connectionof Door S/W
Replace or repair Main PCB
1) F-FAN 2) R-FAN 3) C-FAN
Common PCBGround of REG1 Heater Sink
Power ON with 5 minutesdelay after power OFF.(For preventing the overload of compressor)
Expected causes FAN-MOTOR has failure itself.Check the bad contact of wiring
connection.Check the input of the motor
rotation pulse when fan motoroperates.
The pulse signal generated when motor rotates will be inputted into CN76-#2(F),#3(R),#1(C). These signals will be inputted into MICOM. If signalsare not inputted during motor operating, the fan is turned OFF and ONagain after 10 seconds. But if signals are not still entered, above operationis repeated for 4 times more. If signals are not entered continuously, themotor is restarted after 10 seconds. This function is effective when thenormal operation of motor is locked by foreign matters such as ice.
Checking method of R,F,C FAN Motor The voltage of PCBcommon Ground REG1 Heater Sink andF FAN ; CN76-#5(Red) shall be less than DC 7~12V.R FAN ; CN76-#6(Brown) shall be less than DC 7~12V.C FAN ; CN76-"4"(Orange) shall be less than DC 7~12V.-. Recheck if resistance values are different after measuring.
Is the voltage between Main PCB REG1 Heater Sink and CN76
-#5(Red) around DC7~12V?Is the voltage between Main
PCB REG1 Heater Sink and CN76-#6(Brown) around DC7~12V?
Is the voltage between Main PCB REG1 Heater Sink and CN76 -
#4(Orange) around DC7~12V?
Is the external temperature above 66.2(19)?
Is the external temperature above66.2 (19 )?
Recheck after 5 minutes(Time could be delayeddepending on thetemperature). If the temperature islower, it may not operate.; about59(below15)
Is the voltage between Main PCB REG1 Heater Sink and CN30-
#1 (Black) around 0V?Is the voltage between
Main PCB REG1 Heater Sink andCN30-#2 (Brown) around 0V?
Does DC7~12V alternate with below DC2V between Main PCB REG1 Heater
Sink and CN76-#5(Red)?
Does DC7~12V alternate with below DC2V between Main PCB REG1 Heater
Sink and CN76-#5(Red)?
Does DC7~12V alternate with below DC 2V between Main PCB REG1 Heater
Sink and CN76-#4 (Orange)?
When initial power is applied toappliance, the compressor and fansof fridge/freezer/compressor operate.If freezer temperature is sensed 41by momentary power failure, fans willoperate after 5minutes.
Reference
F FAN ERROR
C FAN ERROR
NW2()-AC 2010.5.22 9:3 AM 47 in
Start
Are all the defrostheater normal?
Check the bimetal, heater disconn-ection itself, wiring connection, etc
Refer to self-diagnosticfunction in the manual
Replace and repair theapplicable sensor
Manual operation for a certain period of time
Manual defrost of Fridge andFreezer operate simultaneously.
Resistance value of sensor according to temperature
Refer to DATA1.Temperature Table for the
detailed temperature.
** Measuring point of defrost value according to Heater **F-DEF : CN72 #7(Brown) #3(Orange)
measure the resistance value(66/240 ohm 10%)R-DEF : CN72 #5(White) #3(Orange)
measure the resistance value(103(120)/397ohm 10%)** 0 : Short trouble / 0: Open(Bimetal, heater) trouble
Checking method of F,R DEF Heater resistance value.F DEF ; CN72-#7(Brown) #3(Orange)R DEF ; CN72-#5(White) #3(Orange)-. Check additionally, if resistance values are different after
the measuring.1) F DEF Heater 2) R DEF Heater
** Measuring point of resistance value according to Sensor **F-DEF : CN30 #6 #8 measure the resistance valueR-DEF : CN30 #4 #8 measure the resistance value** 0 : Short trouble /0 : Open trouble
** Measuring Point of resistance value according to Sensor **PCB common Ground REG1 Heater Sink andF-DEF:CN30 #6 (or Sensor Marking #4(R307),R-DEF:CN30 #4 (or Sensor Marking #2(R303), measure the resistance value.** 0V : Short trouble / 5V : Open trouble
86(30)68(20)50(10)32(0)
14(-10)-4(-20)-22(-30)
4.226.058.8713.2920.4232.2352.41
If Power Freeze Key + Fridge Key are pressedsimultaneously for 8 seconds and then select any key, 3rdTest Mode(Manual defrost) will be operated.
Is the temperature of defrost sensor lower than
53.6(12)?
Is defrost sensor byself-diagnostic normal?
Is power applied toeach defrost heaters?
Is connectionterminal of Main PCB
part normal?
Recheck the applicable sensor which is notreturned.
If defrost sensor temperature of fridge & freezer arehigher than 50(10) & 53.6(12) by the heatingof heater, heating will be finished and returns to thecooling operation after making a pause.
Normal
Repair connection terminal
Reference
Check bimetal, heater itselfdisconnection, wiring connection,
etc.
Replace failure Relay or replacePCB Ass'y
Does the systemreturn to cooling operation after heating
for specified time?
48
TROUBLESHOOTING
- If defrost has trouble, select the self-diagnostic function to detect the error of defrost heater before Power off. (Check thefunction with referring to the self-diagnostic function)
4-2-2. If defrost does not operate (F, R DEF Heater)
R DEF ERROR F DEF ERROR
NW2()-AC 2010.5.22 9:3 AM 48 in
49
TROUBLESHOOTING
4-2-3. If Power is not supplied
CautionAt the power of main PCB, AC input powerand a high voltage over DC170V(325V)areoccurred. Please take care of yourself onrepair and measurement.
Check in SMPS part
Start
- Refer to function and 'reference'parts in the manual whenchecking Main PCB
Connect plug again, & check the plugloosening.
1) Change FUSE AC 250V 2.0A2) Replace PCB ASS'Y
Check the assembly and connection ofwire
1) Check PCB PATTERN and replaceBD1
2) Replace PCB ASS'Y
1) Check REG1 (KA7805)2) Replace PCB ASS'Y
1) Check & repair the assembly of wire2) Replace Panel PCB
1) Check the contact of Lead Wire2) Replace the applicable Relay
(Replace PCB Main)
1) Solder again2) Replace PCB Main
Replace PCB ASS'Y
- Check Main PCB connection- Check the connections betweenupper hinge Cabi-Door
- Check Door Panel PCB connection
Is plug connected in ?Input Voltage115V 15%
Is Fuse on the SMPS PCB
normal?
Is 115V applied to both terminals of
SMPS power VAR1 ?
Is DC 170V applied to both terminals of
BD101 +,-?
Is 12V applied toboth terminal of C111?
Is 5V applied to both terminal of
C113?
Does Panel PCB operates
normally?
Is the load such as relay
normal?
Is there any PCB soldering, Short, or
breakage?
Normal (Recheck)
Checking method of voltage SMPS input ;VAR1 both terminals, or CN10 both terminalAC power.
Common PCB GroundREG1 Heater Sink
Checking method of DC secondary output voltageREG1 input ; Regulator 7805 input Samewih C111 both terminals.DC 12.0V 0.8V
Checking method of DC secondary output voltageREG1 input ; Regulator 7805 input Samewith C113 both terminals.DC 5V 0.5V
NW2()-AC 2010.5.22 9:3 AM 49 in
Start
Did 5mins pass after Compressor
Off?
Check after 5 mins
Normal
Check bad contact of connector
Replace / Repair COMP ASS'Y
No
No
Yes
Yes
Yes
NO
NO
Yes
Yes
Yes
Does compressor work with manual
operation?
Is IC10 MICOM #28 hight?
(5V)
Is IC71 #13 about
0.7V?
Is CN72 connector
normal?
Is COMP ASS'Y
normal?
Normal (Recheck)
Refer to test function in the manual
Did buzzer of manual operation sound?(Check certainly after manual operation)
Check Cold solder joint / Replace PCB
1) Change IC71 Driver IC (TD62083AP)2) Replace PCB
Refer to the circuit diagram in the manual
50
TROUBLESHOOTING
4-2-4. If compressor does not operate
Preliminary Inspection"Check the compressor with selecting the manual operation"1. Compressor does not work, unless 5mins pass after satisfying the temperature.2. Compressor does not work during defrosting.3. Compressor does not work because it sensing low temperature, unless the fridge & freeze sensor is connected.
Checking method of voltagePCB common Ground REG1 Heater Sink and1) IC10 MICOM #28 ; Voltage is high
(5V 0.5V) when compressor is working.
Checking method of voltagePCB common Ground REG1 Heater Sink and1) IC71 #13 ; Voltage is Low (0.7V) when
compressor is working.Common PCB GroundREG1 Heater Sink
NW2()-AC 2010.5.22 9:3 AM 50 in
51
TROUBLESHOOTING
4-2-5. If alarm sounds continuously without stop (Related with buzzer sound)Preliminary Inspection1. The alarm of freezer / fridge will sound(Ding-dong) after 2minutes from initial door open, and it keeps sounding(ding-dong)
at 1 minutes intervals when opening afterward.2. The alarm sounds because MICOM sense as door-open when door is not pressed completely. So refrigerator inner lamp
will be OFF after 10minutes from sensing door-open. In this case, the inner lamp will not ON though the door is openedactually.
If 'ding-dong' sounds continuously.
If 'beep-beep' sounds continuously.
Start
Start
Replace PBA Main Testpart, Solder Touch, &Main PCB
Is door closed completely?
Is water penetrated into the door
switch?
Is theconnector(CN30) inserted
correctly?
Is Door S/W itself(unit)
normal?
Is manual operation / defrost
selected?
Does buzzer sound when Power On
again?
Recheck Main PCB & Door switch
Is input voltage of Main #60 & #52changed at door-open &
door-close?
Remove the cause after comprehendingthe conditions of interference by doorgasket, food, etc.
Repair the trouble of wire connectionand door switch
Repair the bad inserting of connectorand bad contact.
Cancel the manual operation / defrostfunction.
Replace door switch
Replace door switch
Normal
Door & MICOM State
Door
CloseOpen
FMICOM(#60)
RMICOM(#52)
0V(Low) 5V(High)
0V(Low)5V(High)
Separate the door switch and check if the measuredvalue of unit is changed from 0 to according toswitch On/OFF.* Fridge Door Switch is magnetic switch. (It can be
operated when door magnet is combined)
NW2()-AC 2010.5.22 9:3 AM 51 in
If buzzer does not soundIf buzzer does not sounds when button is pressed, manual operation is started, or door is opened,separate Main PCB and then check the breakage of buzzer, bad soldering, etc.(It is recommended to replace Main PCB when the failure of parts is occurred after checking.)
Start
Does it sound 'Dingdong' if press a button
on the frontpanel?
Is the breakage or damage of the buzzer
in the Main PCB?
Recheck the button pressing force andmechanical problem
Check if the lead of component isfallen from the vibration plate of
Buzzer or not.
Does it make a sound of 'Door Open'
alarm when opening the door offreezer or fridge more than
2 minutes?
Main PCB is normal & BUZZER isnormal
Check the panel PCB with referring"How to check Panel Display"
Replace Main PCB
52
TROUBLESHOOTING
NW2()-AC 2010.5.22 9:3 AM 52 in
53
TROUBLESHOOTING
When lightning of Panel PCB is disabled
4-2-6. If Panel PCB does not work normally
Start
No
Yes
Yes
Yes
Yes
Yes
Yes
No
Is the PANEL PCBnormal?
Is the connector of upper hinge COVER
inserted correctly?
No problem / Recheck
Is the connector of PANEL PCB part
inserted correctly?
Is Main PCB connector(CN50)
inserted correctly?
Reinsert connector and checkthe bad contact.
Reinsert the connector of MainPCB and check the bad contact.
Reinsert connector of PANELPCB and check the bad contact.
Replace PANEL PCB
Replace PCB
Check parts trouble, fallen PCB Pattern, Solderconnection of parts
Yes
NoIs Main PCB 12V normal?(Check the power)
Check the connecting part of left/right CABIupper hinge according to left/right opening ofdoor.
Check the connecting part of left/right doorupper hinge according to left/right openingdoor.
Door Part - Check the connecting wire of upper hinge Panel - Check the disconnection & short between wires. Freezer upper CABI - Check the wires between Main PCB - Check the disconnection & short between wires.
NW2()-AC 2010.5.22 9:3 AM 53 in
54
TROUBLESHOOTING
If Panel PCB Key is not selected
Start
No
No
Yes
No
Yes
Yes
No
No
Is Child Lock KEYpressed?
Are any keys arepressed from 6 of keys?
Replace PANEL PCB
Is Panel PCB connectorinserted correctly?
Is connector of upper hinge cover inserted
correctly?
Yes
NoIs Main PCBconnector(CN50) inserted
correctly?Reinsert the Main PCBconnector/ Replace
Reinsert the connector andcheck the bad contact.
Reassemble the Panel PCBCover
Reinsert the connector andcheck the bad contact.
Unlock the Child Lock
NW2()-AC 2010.5.22 9:3 AM 54 in
55
TROUBLESHOOTING
4-2-7. If refrigerator Room Lamp does not light up (F,R - Same condition)
1. When you replace the lamp of freezer/fridge, please power off/unplug AC Cord to avoid an electric shock.2. Please keep in mind you could get burnt by the excessive heating of an incandescent light bulb.3. Bimetal is installed in the refrigerator Lamp. Check that if Lamp may be OFF by bimetal. (It may be deleted per model.)
When lightning of Panel PCB is disabled Start
No
No
Yes
No
Yes
Yes
No
No
Is the Door switchcontact normal?
Is Lamp OFF bybimetal operating?
Check the connection of RDoor switch and check & repair the inner lamp socket.
Is the inner lampfilament cut?
Is the control relay of the inner lamp in PCB?
(RY76)1) Replace PCB
(Expected trouble)-. IC71(#15, #16)-. IC10(#31, #32)-. Relay(RY75,RY76)
2) Bad connection of wire-. CN71("5" Pink, "3" Blue
Wait for returning time of bimetal
Replace the inside lamp
Replace Door S/W
The inner lamp relay operates lighting/lights-out according to door open/close.
If inner lamp does not light, check thenoise of relay operation.
Noise of relay operation sounds everyDoor Open / Close.
F-LAMP Relay -- RY75 R-LAMP Relay -- RY76
Preliminary Inspection
If the door is opened, the contact of door switch will be opened and MICOM will get applied 5V and finally it senses the door open.If it sense 5V for more 2 minutes afterward, Door-open alarm will sound "Ding-Dong" for 10 seconds in 1 minute cycle.Therefore,if the door switch has failure, the refrigerator can make a "Ding-Dong" sound per 1minute cycle. Please refer this for its service.
Preliminary Inspection
Door & MICOM State
Door
CloseOpen
FMICOM(#60)
RMICOM(#52)
0V(Low) 5V(High)
0V(Low)5V(High)
Applied to the model using bimetal only. (Option)
When measure the lamp resistance to the wire, Resistance can be changedby Lamp input voltage.(Below is the actual measurement and the valued can be changed by function.)
Checking method of Door Switch voltage-. PCB common Ground REG1 Heater Sink and
CN30-"2"(Brown) : measure the voltage (R Door Switch)CN30-"1"(Black) : measure the voltage (F Door Switch)=> See the R DOOR Switch at the following picture
CLOSE
OPEN
Common PCB GroundREG1 Heater Sink
Fridge Lamp(Option)CN72-#9(Red) CN71#3(Blue) ; 27Ohm 10%Lamp ; 40W (Basis on 120V)
Freeze LampCN72-#9(Red) CN71#5(Pink); 25Ohm 10%Lamp ; 40W(Basis on120V)
NW2()-AC 2010.5.22 9:3 AM 55 in
56
TROUBLESHOOTING
4-2-8. If refrigerator ROOM Lamp does not light up (F,R - Same condition) - LED1. When you replace the lamp of freezer/fridge, please power OFF
[Explain cold-storage room lamp on the basis of.]When lightning of Panel PCB is disabled Start
No
Yes
Yes
No
Yes
No
No
Is the Door switchcontact normal?
Is the output voltage ofIC71 normal?
Normal / Re-check
Is the output voltageof IC10 MICOM #32
Normal?
Is the main PCB connector(CN71)insertion status normal?
Replace PCB/ Repair the IC71
Re-insert the connectorYes
NoDoes the main PCB connector(CN71)Output normal?(11~13V)
Check the connector terminalReplace PCBYes
NoIs the LED Lamp connectedProperly?
Check the connector terminalYes
Yes
NoIs the LED Lamp normal?
Replace LED Lamp
Replace PCB
Replace Door S/W
Door & MICOM State
Door
CloseOpen
FMICOM(#60)
RMICOM(#52)
0V(Low) 5V(High)
0V(Low)5V(High)
MICOM(LAMP) State
Door
CloseOpen
FMICOM(#31)
RMICOM(#32)
0V(Low) 5V(High)
0V(Low)5V(High)
IC71 State
MICOM(#31/ #32)
IC71 output(#15/ #16)
0V(Low) 5V(High)
12V(High)0V(Low)
Checking method of Door Switch voltage-. PCB common Ground REG1 Heater Sink and
CN30-"2"(Brown) : measure the voltage (R Door Switch)CN30-"1"(Black) : measure the voltage (F Door Switch)=> See the R DOOR Switch at the following picture
CLOSE
OPEN
Common PCB GroundREG1 Heater Sink
Output voltage checking method-. PCB common Ground REG1 Heater Sink and
CN71-"5"(Pink) : measure the voltage (F LED Lamp)CN71-"3"(Blue) : measure the voltage (R LED Lamp)=> Picture is R LED Lamp operation below.
CLOSE
OPEN
Common PCB GroundREG1 Heater Sink
NW2()-AC 2010.5.22 9:3 AM 56 in
4. TROUBLESHOOTING4-1) Check items before failure diagnosis4-1-1. TEST mode (Manual operation / Manual defrost function)4-1-2. Self-diagnostic function4-1-3. Display function of Load condition4-1-4. Display / Exhibition mode setting function4-1-5. Option setting function4-1-6. Option TABLE
4-2) Diagnostic method according to the trouble symptom(Flow Chart)4-2-1. If FAN does not operate (F, R, C - FAN)4-2-2. If defrost does not operate (F, R DEF Heater)4-2-3. If Power is not supplied4-2-4. If compressor does not operate4-2-5. If alarm sounds continuously without stop (Related with buzzer sound)4-2-6. If Panel PCB does not work normally4-2-7. If refrigerator Room Lamp does not light up (F,R - Same condition)4-2-8. If refrigerator ROOM Lamp does not light up (F,R - Same condition) - LED