7 troubleshooting

25

Start

Replace the power cord fuse

Check the connector contact

Replace TRANS (LVT)

Check diode (D1~4) or replace PCB

Repair REG1 (7812) or replace PCB


Check panel PCB display

Isn't the main fuse of the power cord open?

(Model with fuse)

NO

YES

YES

NO

NO

NO

NO

NO

YES

YES

YES

YES

Is the voltage of CN70 end on main

PCB normal?

Is the voltage of 2nd side of TRANS on

main PCB normal?

Is the input voltage of REG1 (7812) on main PCB normal?

Is the output voltage of REG1 (7812) on main PCB normal (12V)?

Is the output voltage of REG2 (7805) on main PCB normal (5V)?

Normal

6. TROUBLESHOOTING

6-1. When the power is not coming on

TROUBLESHOOTING

26

Start



Check connector connection

Check connecting wire Refer to circuit diagram

Repair/replace panel PCB

Check connector contact and terminal connection

Is the output voltage of REG1 (7812) on main

PCB normal (12V)?

YES

YES

NO

NO

NO

NO

NO

NO

YES

YES

YES

YES

Is the output voltage of REG2 (7805) on main

PCB normal (5V)?

Is the CN50 connection on main

PCB normal?

Is the wire connected between CN50 and panel PCB on

main PCB normal?

Is the connection of panel PCB connector

normal?

Is the panel PCB LED connection and pattern

connection normal?

Normal/Check set

6. TROUBLESHOOTING

6-2. When the display panel PCB is not working

27

TROUBLESHOOTING

Start

Check panel operation (Power Cool operation) Refer to panel problem repair

Recheck after selecting the key

Repair wire

Replace photosynthesis PBA

Is the PBA panel normally operating?

YES

YES

NO

NO

NO

NO

YES

YES

Is the Fresh Care Light key on PBA panel selected?

Is the connection of the CN50 (3, 4) wire of main PCB connector

to the photosynthesisLED PCB normal?

Is the photosynthesis LED PBA normal?

Normal/Recheck the set

6. TROUBLESHOOTING

6-3. When photosynthesis LED is not working

TROUBLESHOOTING

28

6. TROUBLESHOOTING

6-4. When the compressor is not working

Start

Enter forced operation

Check cold solder/replace PCB

Replace IC04/replace PCB

Replace relay/replace PCB

Replace/repair COMP

Completely insert connector/check contact

Is forced operation in progress?

YES

YES

NO

NO

NO

NO

NO

NO

YES

YES

YES

YES

Is the output of MICOM #26 "High" (5V)?

Is the #14 of IC04 "Low"?

Is the COMP relay normal?

Is the contact of connector CN71 normal? (1,5)

Is the COMP assembly normal?

Assemble wire and check connected condition

1. The compressor does not operate when 5 minutes have not passed after satisfying the temperature.2. The compressor does not operate during defrosting.3. When the freezer sensor is not connected, it detects as low temperature and the compressor does not operate.

(Except for forced operation.)

TROUBLESHOOTING

29

Start

Enter forced operation

Correct connected condition/check wire

Close door

Replace door switch

Is the COMP operating?

YES

YES

NO

NO

NO

NO

YES

YES

Is the connection with COMP end (joint) normal?

Isn't the door open? (Freezer or refrigerator)

Is the door switch normal?

Assemble wire and check connected condition

6. TROUBLESHOOTING

6-5. When the cooling fan is not working

“When checking the cooling fan, do the checking with the forced operation selected.”

1. When the COMP is turned off, the freezer cooling fan is maintained off.

2. Even when the COMP is turned on, it is always kept off when the freezer or refrigerator door is open.

30

TROUBLESHOOTING

Start

Replace lamp/ LED board

Repair contact part

Repair door switch part

Improve/repair connector contact

Is the lamp/LED board normal?

YES

YES

NO

NO

NO

NO

YES

YES

Is the contact condition of the LAMP/LED board soket

connector normal?

Is the contact part of the door switch normal?

Is the connecting contact part of connector

CN70 1, 7 normal?

Assemble wire and recheck the connected condition

6. TROUBLESHOOTING

6-6. When the refrigerator LED lamp is not working

31

TROUBLESHOOTING

Start

Is the temperature of applicable defrost sensor

-5� or below?

Maintain certain forced operation

Replace MICOM, replace PCB

Replace/repair IC03, IC06, replace PCB

When you press the forced defrost key , does

defrosting start?

YES

NO

NO

NO

YES

NO

NO

YES

YES

NO

Is the power connected to the

defrost heater?

Is MICOM #25 "High"(5V)?

Is it IC04 #13?

Replace/repair relay , replace PCB

Recheck the contact condition of connector CN71

Replace temperature fuse

Replace EV AP assembly

Is the relay (R Y72, R Y71) normal?

Refer to common relay R Y71 defrost heater R Y72 relay check

A

YES

YES

NO

NO

NO

YES

YES

Is the contactcondition connectorCN71 normal?

Is the temperature fuse within the EVAP

normal?

Is the defrost heater disconnected?

Check the wire assembly condition

6. TROUBLESHOOTING

6-7. When the defrost is not working

1. When the defrost sensor is short and defective, the defrost does not work but the normal operation continues. (As the self diagnosis check item, it is checked when the power is turn off/on again.)

2. When the temperature fuse is disconnected, the heating gets disabled, making the temperature rise naturally and delaying the COMP OFF time according to defrost to cause temperature defect.

3. When the defrost sensor is open and defective, the heating does not end and disconnects the temperature fuse to maintain the COMP OFF condition. (As the self diagnosis check item, it is checked when the power is turn off/on again.)

32

TROUBLESHOOTING

Normal

Check wire/replace defrost sensor

Repair temperature detection part, replace PCB

Is the recover after heating for a certain period of

time normal?

NO

YES

YES

NO

NO

YES

Is the temperature of defrost temperature higher than

the ending temperature?

Is the voltage of MICOM #9 entered higher than voltage

of ending temperature?

Measure applicable sensor resistance(Appendix table)

Measure applicable sensor resistance(Appendix table)

Replace PCB

A

6. TROUBLESHOOTING

6-7. When the defrost is not working

33

TROUBLESHOOTING6. TROUBLESHOOTING

6-8. In case of self diagnosis error

1) In case of freezer temperature sensor

▶Error display

Start

Replace temperature sensor

Poor connector contact/reinsertion

Check the wire disconnection between connector sensors

Check cold solder, short, solder touch

Is the single productof fridge temperature

sensor normal?

YES

YES

NO

NO

NO

NO

YES

YES

Is the inserted condition of main PCB connector

(CN50) normal?

Is the connecting wirebetween main PCB connector

(CN50) and temperature sensor(water color) normal?

Reference 12Refer to temperaturetable

Is the input voltage of MICOM PIN

#10 normal?

Replace PCB

34

TROUBLESHOOTING6. TROUBLESHOOTING

2) In case of external sensor error (Applied to type with external sensor)

▶Error display

Start

Replace external sensor

Poor connector contact/reinsertion

Check the wire disconnection between connector sensors

Check cold solder, short, solder touch

Is the single product ofdefrost sensor normal?

YES

YES

NO

NO

NO

NO

YES

YES

Is the inserted condition of main PCB connector

(CN50) normal?

Is the connecting wire betweenmain PCB connector (CN50) and defrost

sensor (water color) normal?

Reference 12Refer to temperaturetable

Is the input voltage of MICOM PIN #9 normal?

Replace main PCB

7 troubleshooting

Documents