Samsung Refrigerator Service Manual

By | October 27, 2022

4-1. Function for failure diagnosis 40

4-1-1) TEST MODE 40

4-1-2) DISPLAY FUNCTION OF COMMUNICATION ERROR 41

4-1-3) SELF-DIAGNOSTIC FUNCTION 42

4-1-4) DISPLAY FUNCTION OF LOAD CONDITION    45

4-1-5) EXHIBITION MODE SETTING FUNCTION 46

4-1-6) OPTION SETTING 46

4-1-7) Option TABLE 49

4-2. Diagnostic method according to the trouble symptom 51

4-2-1) IF THE TROUBLE IS DETECTED BY SELF-DIAGNOSIS 52

4-2-2) IF FAN DOES NOT OPERATE 60

4-2-3) IF ICE MAKER DOES NOT OPERATE 61

4-2-4) IF DEFROST DOES NOT OPERATE (F,R DEF 62

4-2-5) IF POWER IS NOT SUPPLIED 63

4-2-6) IF COMPRESSOR DOES NOT OPERATE 64

4-2-7) WHEN ALARM SOUND CONTINUOUS WITHOUT STOP 65

4-2-8) IF PANEL PCB DOES NOT WORK NORMALLY 67

4-2-9) IF PANTRY PANEL PCB IS NOT WORKING 68

4-2-10) WHEN REFRIGERATOR ROOM LAMP DOES NOT LIGHT UP 69

4-2-11) IF ICE WATER IS NOT SUPPLIED 70

4-2-12) IF WATER IS NOT SUPPLIED    71


4-1-1. Test mode (manual operation / manual defrost function)    

  • If Power Freeze & Fridge temperature control Key on the front of panel are pressed simultaneously for 8 seconds , it will be changed to the test mode and all displays on the front of panel will be off.
  • If any key on the front of panel is pressed within 15 seconds after the test mode, it will be operated as below sequence :

    manual operation(fresh food compartment) manual defrost of fresh food compartment(rd)
    manual defrost of fresh food and freezer compartments (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 be canceled and it will be returned to previous mode.

    • Manual operation function



1-1) If any key is pressed once in test mode, blinks “FF” on the display and it indicates the refrigerator has entered the manual operation. At this moment, buzzer beeps as an alarm.

1-2) If manual operation is selected, comp will run at once without 5 minutes delay in any mode. If the refrigerator is on the defrost cycle at the moment, defrost will be finished and manual operation will begin.

(Be careful if manual operation get started at the moment of comp off, over load could be occurred)

1-3) If manual operation works, comp & f-fan operate continuously for 24 hours and fresh food compartment will be controlled by the setting temperature.

1-4) When the manual operation runs, setting temperature will be selected automatically as below: freezer compartment (-25), fresh food compartment (1).

1-5) During manual operation, Power Freeze & Power Cool function will not be worked. If a function is selected, the power function icon of the selected function will be off automatically after 10 seconds.

1-6) Manual operation can be canceled during manual operation by turning on the appliance after power off(reset) or choosing the step 4) test cancel mode.

1-7) Alarm(0.25 sec ON/ 0.75 sec OFF) will beep continuously until manual operation is completed and there is no function to make the sound stop.

  • Manual defrost(fresh food compartment) function


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 food compartment will be defrosted.

2-2) At this moment, alarm beeps for 3 seconds(0.1 sec ON/ 1 sec OFF) during manual defrost(fresh food compartment) function.

  • Simultaneous manual defrost(fresh food and freezer compartments) 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.

Manual defrost of Fresh food and freezer compartments are followed by manual defrost freezer compartment.

3-2) At this moment, alarm beeps for 3 seconds (0.5 sec ON/ 0.5 sec OFF) during manual defrost function of fresh food and freezer compartment.

  • Test cancel mode

    4-1) During defrosting of fresh food and freezer compartments simultaneously, if the display panel change to the test mode and test button is pressed one more time, defrosting of fresh food and freezer 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 again after it OFF.

4-1-2. Display function of Communication error    

  • Display function when Panel
    MAIN MICOM communication has error

    1-1) If there is no answer for 10 seconds after the panel micom received the requirement of communication, “Pc – Er” display on the panel PCB will be ON/OFF alternately until the communication error is canceled. (0.5 sec ALL ON, 0.5 sec ALL OFF alternately)

(0.5 sec ALL ON, 0.5 sec ALL OFF alternately)

4-1-3. Self-diagnostic function    

  • 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 applicable display LED will blink for 0.5 sec.

    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.

    Display does 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 troubled sensors are corrected or Self-diagnostic function key (Power Freeze + Power Cool ) are pressed simultaneously for 8 seconds.

    (Return to normal display mode)



  • Self-diagnostic function during normal operation


2-1) If Power Freeze + Power Cool Key are pressed simultaneously for 6 seconds during normal operation, the temperature setting display will operate for 2 seconds (ON/OFF 0.5sec each).

If Power Freeze + Power Cool Key are pressed simultaneously for 8 seconds (including above 2 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 is an error, display of error will be operated for 30 seconds and then return to normal condition whether problem is corrected or not.

(Refer to self-diagnosis CHECK LIST)

2-3) Input by button is not accepted during self-diagnostic function.

* Self-diagnosis CHECK LIST

NO

Trouble item

Display LED

Trouble contents

1

Ice Maker Sensor Error

R-1-

ICE MAKER SENSOR part error

2

R-Sensor Error

R-1-

FF SENSOR part error

3

R-DEF-Sensor Error

R-1-

FF defrost SENSOR part error

4

R-FAN Error

R-1-

FF inner fan motor part error

5

Ice Maker Error

R-1-

ICE MAKER operation error

6

R-DEF.Error

R-1-

FZ defrost part error

7

Ambient-Sensor Error

F-1-

External SENSOR part error

8

F-Sensor Error

F-1-

FZ SENSOR part error

9

F-DEF-Sensor Error

F-1-

FZ defrost SENSOR part error

10

F-FAN Error

F-1-

FZ inner fan motor part error

11

C-FAN Error

F-1-

Machine room fan motor part error

12

F-DEF. Error

F-1-

FZ defrost part error

13

Pantry-Damper-Heater Error

R-10-

Damper Heater open/wire error

14

Pantry-Sensor Error

R-10-

Pantry Room SENSOR part error

15

Panel Main MICOM communication Error

F-10-

Panel Main MICOM communication error

16

L    M communication Error

F-10-

LOAD Main MICOM communication error

F-10

F-1

R-10

R-1



* Self-diagnostics check list

LED

Item

Trouble contents

Diagnostic method

R-1-

Ice Maker Sensor Error

Display error : separation of sensor housing part, contact error, disconnection, short circuit

Display error of detecting temperature of sensor: more than
(+65°C) or less

than (-50°C)

When checking the voltage of MAIN PCB CN90

#3CN90#4 : shall be between 4.5V~1.0V.

R-1-

R-Sensor Error

When checking the voltage of MAIN PCB CN30#6 CN75#1:shall be between 4.5V~1.0V

R-1-

R-DEF-Sensor Error

When checking the voltage of MAIN PCB CN30#7 CN75#:shall be between 4.5V~1.0V

R-1-

R-FAN Error

Display error during operation of applicable fan motor : Feed Back signal line contact error, separation of motor wire, motor error Voltage of MAIN PCB CN75 Orange
Gray shall be between 7V~12V

R-1-

Ice Maker Error

Display error : ice making kit is harvested more than 3 times and level error

** Apply to the applicable Ice Maker model.

After replacing ice maker, check the operation by turning the appliance ON again.

R-1-

R-DEF. Error

Display error : separation of fresh food compartment defrost heater housing part, contact error, disconnection, short circuit or temperature fuse error.

Display error : the defrosting does not finish though fresh food compartment defrost is heating continuously for more than 80 minutes.

After separating MAIN PCB CN70,CN71 from PCB, check the resistance value between CN70 White CN71 Orange shall be 102(441) ohm 7%. (Resistant value is varied by the input power)

Check 0 Ohm : heater short, Ohm : wire / bimetal Open.

F-1-

Ambient-Sensor Error

Display error : sensor housing separation, contact error, disconnection, short circuit Display error by detecting temperature of sensor: more than (+65°C) or less than (-50°C) When checking the voltage of MAIN PCB CN32#1 #4 : shall be between 4.5V~1.0V.

F-1-

F-Sensor Error

When checking the voltage of MAIN PCB CN30#3 CN75#1:shall be between 4.5V~1.0V

F-1-

DEF-Sensor Error

When check the voltage of MAIN PCB CN30#4 CN75#1:shall be between 4.5V~1.0V

F-1-

F-FAN Error

Display error during operation of applicable fan motor : Feed Back signal line contact error, motor wire separation, motor error Voltage of MAIN PCB CN75 Yellow
Gray shall be between 7V~12V.

F-1-

C-FAN Error

Display error during operation of applicable fan motor : Feed Back signal line contact error, motor wire separation, motor error Voltage of MAIN PCB CN75 Sky-blue
Gray shall be between 7V~12V.

F-1-

F-DEF. Error

Display error : separation of freezer compartment defrost heater housing part , contact error, disconnection, short circuit or temperature fuse error. Display error : the defrosting does not finish though fresh food compartment compartment defrost is heating continuously for more than 70 minutes. After separating MAIN PCB CN70,CN71 from PCB, check the resistant value between CN70 brown CN71 Orange shall be 102(220) ohm
7%. (Resistant value is varied by input power) Check 0 Ohm : heater short,
Ohm : wire / bimetal Open.

R-10-

Pantry-Damper-Heater Error

Display error when open error is detected by damper heater : separation of Damper Heater housing part, contact error, disconnection, short circuit After separating MAIN PCB CN91from PCB, check the resistant value between Black
brown wire shall be 145 ohm
7%. Check 0 Ohm : heater short,
Ohm : wire / bimetal Open.

R-10-

Pantry-Sensor Error

Display error : separation of sensor housing, contact error, disconnection, short circuit.

Display error by detecting temperature of sensor: more

than (+65°C) or less than (-50°C)

When checking the voltage of MAIN PCB CN30#8 #9 : shall be between 4.5V~1.0V.

F-10-

PanelMain communication Error

Display “oP/LC-Er” in the panel with alarm : MICOM MAIN    LOAD communication error MICOM MAIN    PANEL communication error LC-Er is displayed when the Option is not equivalent with the right value Actually, it is desirable to recheck the condition with the oscilloscope after replacing Main and Panel PCB.

F-10-

LoadMain communication Error


4-1-4. Display function of Load condition    



  • If Power Freeze Key + Power Cool Key are pressed simultaneously for 6 seconds during normal operation, the temperature setting display of fresh food and freezer compartments will blink ALL ON/OFF with 0.5 for 2 seconds.
  • At this moment, If Fridge Key after Power Freeze Key + Power Cool Key is pressed, load condition display mode will be returned with alarm.
  • Load condition display mode shows the load that micom signal is outputting.

    However, It means that micom signal is outputting, it does not mean whether load is operating or not. That is to say that though load operation is displayed, load could not be operated by actual load error or PCB relay error etc.

  • Load condition display function will maintain for 30 seconds and then normal condition will be returned automatically.
  • Load condition display is as below.


F-10    R-10

* Load mode Check list

Display LED

Display contents

Operation contents

R-1- R-FAN High

When fresh food compartment fan high operates, applicable LED ON

R-1- R-FAN Low

When fresh food compartment fan low operates, applicable LED ON

R-1- R-DEF Heater

When fresh food compartment defrost heater operates, LED ON

R-1- Start Mode

Initial power ON refrigerator, LED ON

R-1- Overload condition

When ambient temperature is more than 93 (34°C), LED ON

R-1- Low temperature condition

When ambient temperature is less than 72 (22°C), LED ON

F-1- , ALLLEDOff Normal Condition

When ambient temperature is between 73 (23°C) ~ 91 (33°C), LED ON

R1- Exhibition Mode

Display mode, LED ON

F-1- COMP.

When compressor operates, applicable LED ON

F-1- F-FAN High

When freezer compartment fan high operates, applicable LED ON

F-1- F-FAN Low

When freezer compartment fan low operates, applicable LED ON

F-1- F-DEF Heater

When freezer compartment defrost heater operates, LED ON

R-10- C-FAN High

When compressor fan high operates, applicable LED ON

R-10- C-FAN Low

When compressor fan low operates, applicable LED ON

F-10- French Heater

When french heater operates, applicable LED ON

F-10- Pantry Room Damper Open

When damper open, applicable LED ON

4-1-5. Exhibition mode setting function    



  • If Power Freeze Key + Freezer Key are pressed simultaneously for 3 seconds during normal operation, show room mode will be started with buzzer sound(ding-dong).
  • If above Power Freeze & Freezer Key are pressed one more time, show room mode will be canceled.
  • If show room mode is selected, blinks “OF-OF” on the temperature setting display of the panel and it indicates the refrigerator has entered the show room mode.
  • During show room mode, if fresh food and freezer compartments sensors are higher than 65 show room mode will be canceled automatically and freezing operation will be returned. (There is no buzzer sound when the show room mode is canceled by the temperature)
  • Operation contents of show room mode
    • Display, Fan motor and etc operate normally, not to operate compressor only.
    • Defrost is not operated. (including french heater)
    • Display function of the initial real temperature is finished.
    • Under the condition of show room mode, show room mode will be operated when Power On after Power OFF.

4-1-6. Option setting function    
If Freezer Key + Fridge Key are pressed simultaneously for 12 seconds during normal

operation, fresh food and freezer compartments temperature display will be changed to option

setting mode.






* Key control in option mode

Power Freeze Key

Code Down key

Freezer Key

Code Up key

Power Cool key

Reference Value down key

Fridge key

Reference Value Up key


If the display changes to option setting mode, all displays will be off except freezer and fridge compartments temperature display as below.

(Fresh food and freezer compartments case will be explained only because all options are operated with the same method according to the option table.)


    

  • For example, if you want to change freezer compartment standard temperature to (- 2°C) by operating option, do as below.

    This function is for changing the standard temperature.

    In (-19°C) of current temperature of freezer compartment, if you make the temperature lower to (-2°C) by the option, the standard temperature would be controlled (-21°C) Therefore, if you change the setting of temperature option to (-19°C) on the panel, the appliance will be operated with (-21°C).

    It means that standard temperature is controlled (-2°C) less than setting temperature in the display.

NOTE

  • After changing to the option mode, fresh food compartment “0” , freezer compartment “0” will be displayed. ( Basically fresh food compartment “0”, freezer “0” would be set at shipping process, but setting value could be changed for the purpose of improving product 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 temperature display.

  • If freezer compartment “4” is set as below freezer compartment code after fresh food compartment “0 is set, standard temperature of freezer compartment will be lower than 28.4(-2.0°C).

    (Refer to the picture “changing the freezer compartment temperature”)

        

    : If you wait for 20 seconds after completing the setting, MICOM will save the setting value to the EEPROM and normal display will be returned and the option setting mode will be canceled.

    • Option changing method as above is the same as all RF266/265** model.
  • By the same method as above, it is possible to control the fresh food compartment temperature, water supply, ice-maker harvest temperature/time, defrost return time, hysteresis by temperature, notch gap by temperature etc.
  • 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 20 seconds. Do not turn off the appliance before returning to the normal display mode.

NOTE


4-1-7. Option TABLE    

  • Temperature changing table of freezer compartment

ex) If you want to change the freezer standard temperature to 28.4 (-2°C)






  • Temperature changing table of fresh food compartment



Below options are applied to the applicable model with ice maker.

Do not set below options to the model without Ice Maker.

  • To change the ice maker harvest waiting time

    This option controls the harvest waiting time for ice dispensing from Ice maker

Set item

ICE MAKER waiting time of ice making

Reference Value

Fridge Room 7-SEG

3

             




    

ex) If you want to change the waiting time to 60 minutes

  • To change the ice making sensor temperature of ice maker

This option Controls the standard temperature of judgment that is checking whether ice of ice maker is frozen completely or not.

Set item

ICE MAKER control the temperature of ice making

Reference Value

Fridge Room 7-SEG

4


ex) If you want to change the ice making sensor temperature to 5.0 (-15°C)



DATA1.Temperature table

Resistance value and MICOM port voltage of sensor according to the temperature SENSOR CHIP : based on PX41C

Voltage

Resistance

Voltage

Resistance

Voltage

Resistance

-50

-58

4.694

153319

-5

23

3.107

16419

40

104

1.153

2997

-49

-56.2

4.677

144794

-4

24.8

3.057

15731

41

105.8

1.124

2899

-48

-54.4

4.659

136798

-3

26.6

3.006

15076

42

107.6

1.095

2805

-47

-52.6

4.641

129294

-2

28.4

2.955

14452

43

109.4

1.068

2714

-46

-50.8

4.622

122248

-1

30.2

2.904

13857

44

111.2

1.040

2627

-45

-49

4.602

115631

0

32

2.853

13290

45

113

1.014

2543

-44

-47.2

4.581

109413

1

33.8

2.802

12749

46

114.8

0.988

2462

-43

-45.4

4.560

103569

2

35.6

2.751

12233

47

116.6

0.963

2384

-42

-43.6

4.537

98073

3

37.4

2.700

11741

48

118.4

0.938

2309

-41

-41.8

4.514

92903

4

39.2

2.649

11271

49

120.2

0.914

2237

-40

-40

4.490

88037

5

41

2.599

10823

50

122

0.891

2167

-39

-38.2

4.465

83456

6

42.8

2.548

10395

51

123.8

0.868

2100

-38

-36.4

4.439

79142

7

44.6

2.498

9986

52

125.6

0.846

2036

-37

-34.6

4.412

75077

8

46.4

2.449

9596

53

127.4

0.824

1973

-36

-32.8

4.385

71246

9

48.2

2.399

9223

54

129.2

0.803

1913

-35

-31

4.356

67634

10

50

2.350

8867

55

131

0.783

1855

-34

-29.2

4.326

64227

11

51.8

2.301

8526

56

132.8

0.762

1799

-33

-27.4

4.296

61012

12

53.6

2.253

8200

57

134.6

0.743

1745

-32

-25.6

4.264

57977

13

55.4

2.205

7888

58

136.4

0.724

1693

-31

-23.8

4.232

55112

14

57.2

2.158

7590

59

138.2

0.706

1642

-30

-22

4.199

52406

15

59

2.111

7305

60

140

0.688

1594

-29

-20.2

4.165

49848

16

60.8

2.064

7032

61

141.8

0.670

1547

-28

-18.4

4.129

47431

17

62.6

2.019

6771

62

143.6

0.653

1502

-27

-16.6

4.093

45146

18

64.4

1.974

6521

63

145.4

0.636

1458

-26

-14.8

4.056

42984

19

66.2

1.929

6281

64

147.2

0.620

1416

-25

-13

4.018

40938

20

68

1.885

6052

65

149

0.604

1375

-24

-11.2

3.980

39002

21

69.8

1.842

5832

66

150.8

0.589

1335

-23

-9.4

3.940

37169

22

71.6

1.799

5621

67

152.6

0.574

1297

-22

-7.6

3.899

35433

23

73.4

1.757

5419

68

154.4

0.560

1260

-21

-5.8

3.858

33788

24

75.2

1.716

5225

69

156.2

0.546

1225

-20

-4

3.816

32230

25

77

1.675

5039

70

158

0.532

1190

-19

-2.2

3.773

30752

26

78.8

1.636

4861

71

159.8

0.519

1157

-18

-0.4

3.729

29350

27

80.6

1.596

4690

72

161.6

0.506

1125

-17

1.4

3.685

28021

28

82.4

1.558

4526

73

163.4

0.493

1093

-16

3.2

3.640

26760

29

84.2

1.520

4369

74

165.2

0.481

1063

-15

5

3.594

25562

30

86

1.483

4218

75

167

0.469

1034

-14

6.8

3.548

24425

31

87.8

1.447

4072

76

168.8

0.457

1006

-13

8.6

3.501

23345

32

89.6

1.412

3933

77

170.6

0.446

978

-12

10.4

3.453

22320

33

91.4

1.377

3799

78

172.4

0.435

952

-11

12.2

3.405

21345

34

93.2

1.343

3670

79

174.2

0.424

926

-10

14

3.356

20418

35

95

1.309

3547

80

176

0.414

902

-9

15.8

3.307

19537

36

96.8

1.277

3428

81

177.8

0.404

877

-8

17.6

3.258

18698

37

98.6

1.253

3344

82

179.6

0.394

854

-7

19.4

3.208

17901

38

100.4

1.213

3204

83

181.4

0.384

832

-6

21.2

3.158

17142

39

102.2

1.183

3098

84

183.2

0.375

810

4-2-1. If the trouble is detected by self-diagnosis    


  • If ICE Maker Sensor has trouble

ERROR Code

Start

Is MAIN PCB Connector CN90 inserted correctly?

YES

Is ICE Maker Sensor
unit normal?

YES

Is the voltage between

MAIN PCB Connector CN90#”4″(White) and CN1#”3″(Black) normal?

YES

Is input voltage of IC02 MICOM #30 normal?

YES

NO


N
O


NO(0.6V > Measurement < 4.6V)


NO



  • If R Sensor has trouble

ERROR Code


Sensor MICOM/Connector number

Start

Is MAIN PCB

Connector CN30 to CN75

correctly?

YES

Is R Sensor unit normal?

YES

Is the voltage between

inserted

NO


NO


NO(0.6V > Measurement < 4.6V)

Connector CN30#6(White) to CN1#3(Black) PCB typical Ground

Voltage measured between 4.6V ~ 0.6V.

MAIN PCB Connector CN30#6(White) to CN1#3(Black) normal?

YES

Is the input voltage to    NO IC01 MICOM #54 normal?

YES



Start

Is MAIN PCB

Connector CN30 to CN75

correctly?

YES

Is R DEF Sensor unit normal?

YES

NO

inserted


NO

Sensor MICOM/Connector Number

Connector CN30-“7″(Sky-blue) and CN1-“3″(Black) PCB common Ground

Voltage measured between 4.6V ~ 0.6V.

Is the input voltage between MAIN PCB Connector CN30#7(Skyblue)

to CN1#3(Black) normal?

YES

Is the input voltage of IC01 MICOM # 57 normal?

YES

NO(0.6V > Measurement < 4.6V)


NO



Start


Sensor MICOM/Connector number

Connector CN32#1(White) to CN1#3(Black) PCB typical Ground

Voltage measured between 4.6V ~ 0.6V.

Is MAIN PCB

Connector CN32 inserted correctly?

YES

Is Ambient Sensor unit normal?

YES

Is the voltage between

MAIN PCB Connector CN32#1(White) to CN1#3(Black) normal?

YES

Is the input voltage of IC01 MICOM #59 normal?

YES

NO


NO


NO(0.6V > Measurement < 4.6V)


NO



Start


Sensor MICOM/Connector number

Connector CN30#3(Red) to CN1#3(Black) PCB typical Ground

Voltage measured between 4.6V ~ 0.6V.

Are MAIN PCB

Connector CN30 to CN75 inserted correctly?

YES

Is F Sensor unit normal?

YES

Is the voltage between

MAIN PCB Connector CN30#3(Red) to CN1#3(Black) normal?

YES

Is the input voltage of IC01 MICOM #52 normal?

YES

NO


NO


NO(0.6V > Measurement < 4.6V)


NO



Start


Sensor MICOM/Connector number

Connector CN30#4(Orange) to CN1#3(Black) PCB typical Ground

Voltage measured between 4.6V ~ 0.6V.

Are MAIN PCB

Connector CN30 to CN75 insert correctly?

YES

Is F DEF Sensor unit normal?

YES

Is the voltage between

MAIN PCB Connector CN30#4(Orange) to CN1#3(Black) normal?

YES

Is the input voltage of IC01 MICOM #53 normal?

YES

NO


NO


NO(0.6V > Measurement < 4.6V)


NO



  • If Pantry Sensor has trouble

ERROR Code

Start


Sensor MICOM/Connector number

Connector CN30#8(White-black) to CN1#3(Black) PCB typical Ground

Voltage measured between 4.6V ~ 0.6V.

Is MAIN PCB

Connector CN30 insert correctly?

YES

Is Pantry Sensor normal?

YES

Is the voltage between

MAIN PCB Connector CN30#8(Whiteblack) to CN1#3(Black) normal?

YES

Is the input voltage of IC01 MICOM Pin# 58 normal?

YES

NO


NO


NO(0.6V > Measurement < 4.6V)


NO




  • If Pantry Room Damper Heater has trouble

ERROR Code

MICOM

#37

condition

Initial

power On

Damper

heater off

Damper

heater On

4.0V ~

4.5V

4.0V ~

4.5V

0V


4-2-2. If FAN does not operate    


Start

Is COMP ON ?


IsthevoltagebetweenMAIN PCBCN1#3(Black)andCN75#4(Sky

-blue)aroundDC7~12V?

IsthevoltagebetweenMAIN PCBCN1#3(Black)andCN75#3

(Orange)aroundDC7~12V?

Is the voltage between MAIN

PCB CN1#3 (Black) and CN75#2          (Yellow) around DC7~12V?



Is the voltage between MAIN PCB CN1#3 (Black) and CN30#2

(Purple) around 0V?

Is the voltage between MAIN PCB CN1#3 (Black) and CN30#1

(Black) around 5V?

Door & MICOM State

Door

Close Open

F MICOM (#50)

5V(High) 0V(Low)

R MICOM(#3)

Right and Left 0V(Low)

5V(High)

Power ON with 5 minutes delay after power OFF.

For preventing the over load of compressor)

In initial power to appliance, the compressor and fans of fresh food/ freezer, compressor fan operate. If freezer temperature is sensed of 41 by momentary power failure, fans will operate after 5 minutes.

DoesDC7~12Valternatewithbelow DC2VbetweenMAINPCBCN1#3(Black) andCN75#4(Sky-blue)

DoesDC7~12Valternatewithbelow DC2VbetweenMAINPCBCN1#3(Black) andCN75#3(Orange)

DoesDC7~12Valternatewith belowDC2VbetweenMAINPCB CN1#3(Black)andCN75-#2(Yellow)

Replace MAIN PCB

F FAN pulse voltage    typical PCB Ground CN75#5(Black)        CN10#3(Black)

The voltage measured around 2~3V with multi-meter though the voltage is

Reference

CN75-5(F),6(R),7(C)will generate the pulse signal when motor rotates. These signals will be inputted into MICOM.

Unless signals are not inputted during motor operating, will be ON 10 seconds after fan Off. But if signals are not still entered, the above operation will restart four times more.

If signals are not entered continuously, the motor will be restarted after 10 seconds.

This function is effective when the normal operation of motor would be restrained by foreign matters such as ice.

Expected causes

Check that if FAN-MOTOR has failure itself.

Check that if wiring connection has bad contact.

Check the input of the fan motor rotation pulse when motor fan operates.

very weak because of pulse signal

Display for checking the self-diagnostic function R FAN ERROR

Checking method of R,F,C FAN Motor voltage

The voltage between PCB typical Ground CN1-“3″(Black) and R FAN ; CN75#2(Yellow) shall be less than DC 7~12V.

F FAN ; CN75#3(Orange) shall be less than DC 7~12V. C FAN ; CN75#4(Sky-blue) shall be less than DC 7~12V.

– Recheck if resistance values are different after measuring.

typical PCB Ground

CN1#3(Black)

F FAN ERROR

1) R-FAN    2) F-FAN    3) C-FAN

C FAN ERROR

4-2-3. If ICE MAKER does not operate    


Function ERROR Code




    




    

    

  • Check the wiring connection part
    • Replace ICE MAKER KIT
    • Replace the MAIN PCB

    

1) Replace the Water Valve

* refer to operation condition of water valve

    



    




4-2-4. If defrost does not operate (F,R DEF Heater)    


R DEF ERROR    F DEF ERROR


    

Start

**Measuring point of resistance value according to sensor ** F-DEF : CN30#4 CN75#1 measuring resistance value

R-DEF : CN30#7 CN75#1 measuring resistance value

** 0 : Short trouble /    : Open trouble

Are the all deforst          heater normal?



Is defrost sensor by          self-diagnostic normal?



**Measuring point of resistance value according to sensor ** F-DEF : CN30#4 CN75#1 measuring resistance value

  • EF : CN30#7 CN75#1 measuring resistance value

** 0V: Short trouble / 5V: Open trouble

Is the temperature of          defrost sensor lower

than 53.6 (12°C)?

If Power Freeze Key + Fridge Key are pressed simultaneously for 8 seconds and then select any key, 3rd test mode(manual defrosting) will be operated.

Is power applied to each defrost heaters?

            Doesthesystemreturn tocoolingoperationafter heatingforspecifiedtime?

Reference
If defrost sensor temperatures of fresh food and freezer compartments are higher than 50 (10 ), 53.6 (12 ) by

the heating from heater, heating would be finished and will return to cooling operation after a pause.

Checking method of F,R DEF Heater resistance value F FEF ; CN70#9(Brown)    CN71#9(Orange) R FEF ; CN70#7(White)    CN71#9(Orange)

– Recheck if resistance values are different after the test

  • F DEF Heater    2) R DEF Heater


Isconnectionterminalof MAINPCBpartnormal?





4-2-5. If Power is not supplied    

    Start    

Is plug connected in?


Is power 115(220)V          both terminals of SMPS

PCB CN1?

Checking method of SMPS voltage CN1 input ; CN1#1(Red) #3(Black) AC voltage

Is fuse on the SMPS          PCB down?

Is DC170(325)V applied both

terminals of BD1+,-

Is DC5.8V

  • CheckPCBPATTERNandreplaceBD1
  • ReplacePCBASS’Y

Checking method of SMPS 2nd output voltage CN2 input ; CN2#1(Red)

#3(Black) same as C19 terminals.. DC 5V    0.3V

applied between TOP          switch 246Y C to S?

ReplacePCBASS’Y

Is 12V applied both          terminals of C16?

Checking method of SMPS 2nd output voltage CN2 input ; CN2#5(Yellow)

#3(Black) same as C16 terminals. DC 12V    0.6V

Is 5V applied both terminals of C19?

  • Replace U4 (D10LC20U)
  • Replace PCB ASS’Y
  • Replace REG1 (KA7805)
  • Replace PCB ASS’Y

Does Panel PCB          operate normally?

  • Checkassemblywireandrepair
  • ReplacePanelPCB

Is normal load such          as Relay?

-CheckMAINPCBconnection

-Checktheconnections betweencabinettodoor

-Checktheconnections betweendoortopanelPCB

Is there any PCB soldering, short, breakage?

Normal(Recheck)

  • Check the contact of lead wire
  • Replace the applicable relay / PCB MAIN
  • Solder again
  • Replace PCB MAIN


4-2-6. If compressor does not operate    




4-2-7. When alarm sound continuous without stop(related with buzzer sound)    


If ‘ding-dong’ sounds continuously




    


    




If ‘beep-beep’ sounds continuously

    




    




If buzzer does not sound

Buzzer is installed on the panel PCB in this model.

If buzzer does not sound when button is pressed, manual operation is started and door is opened, should separate panel PCB and check the breakage of buzzer and bad soldering.

It is very hard to repair the panel PCB because it consists of SMD assemblies.

It is recommended to replace assembly PCB when the failure associated with panel is occurred except the minor error such as switch pressing error, surface peeling off and so on.




4-2-8. If Panel PCB does not work normally    


When lighting of Panel PCB is disabled or only some LED Lamp are disabled


Is the connector of upper hinge cover inserted correctly?

        

Is MAIN PCB

connector (CN50) inserted correctly?

Is Top Table Panel PCB connector

inserted correctly?

Is lighting operate normally when replace Panel-PCB?

    




If Panel PCB KEY is not selected

If it is not repaired with using the basic checking method as above


4-2-9. If Pantry Panel PCB is not working normally    


Start

Does fresh food compartment door switch operate normally?

Is the connector of

pantry room in fresh food          compartment inserted

correctly?


Is MAIN PCB

Connector (CN78) inserted correctly?




If Panel Key is not selected

Is signal of MAIN PCB CN78 normal?



Is the lighting operated when replace Pantry

Panel-PCB?

    




typical PCB Ground CN1#3(Black)

If Panel Panel PCB Key is not selected

If it is not repaired with using the basic checking method as above

Checking method of voltage Based on PCB typical Ground CN1#3(Black)

1) Key voltage ; CN78#1″(Purple)

  • select(operating)(0V)    2)normal(about5.0V 0.5V)
  • LED part voltage ; CN78-“7″(Yellow), “8”(Pink)    Voltage of CN78 is same as IC74 #12,#11 voltage.

– Display On (0.7V 0.3V)    – Display Off (9.7V 1V)

Is a key pressed continuously?

Is the PCB system

still operated by separating of the mechanism?

Is the lighting operated when replace Pantry Panel-PCB?

Is a normal voltage outputted from MAIN PCB IC74

in the key operating?

Reassemble PCB ASS’Y / Enforce the cancelation of pressed keys


Convertible compartment Panel PCB itself has trouble.

Replace MAIN PCB Check the short of MAIN Panel wire

Check the wire of Pantry Room – disconnection, short between wires

Check the short/open of the pantry panel lighting circuit in MAIN PCB.


4-2-10. When refrigerator ROOM Lamp does not light up    



The case of fresh food compartment(room) lamp will be explained only.

Because it is possible to repair the other room lamps with the same method.

Is the connection          point of R-door switch

normal?



    





Reference
If the door is opened, the contact of door switch will be opened and MICOM will get applied 5V to finally sense Open.
If 5V has been sensed over two minutes afterwards, Door-Open alarm will sound for 10 seconds in a oneminute cycle. For that reason, if the door switch has failure, the refrigerator can make Ding-Dong sound per a oneminute cycle. Please note the step for its service.
When measure lamp resistance to the Wire Resistance can be changed by Lamp input voltage. (Actual measurement is below, it can be changed by performance)

Fresh food compartment lamp CN70#1(Red) CN71#1 (Blue) ;
10(33)Ohm3 Ohm Lamp ; 60W + 60W

Freezer compartment lamp CN70#1(Red)
CN71#3 (Purple) ; 15(66)Ohm5 Ohm Lamp ; 60WChecking method of Door Switch voltage
Measuring voltage of Sensor Check Point #5(IC01 MICOM #58) on PCB or CN30#8(White-black) CN75#1(Gray)
Compare time table after measuring
Measuring voltage of CN30#8(white-black) CN75#1(Gray) are below

typical PCB Ground CN10#3″(Black)




 

4-2-11. If ICE Water is not supplied    

typical PCB Ground CN1#3(Black)



4-2-12. If Water is not supplied    


    

Does Main PCB IC73 #14          have about 0.7V output?

            Is the contact point of main          PCB RELAY RY7A normal?


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