Hướng dẫn sửa chữa tủ lạnh RT EA

REFRIGERATOR Basic Model : RT62EA* Model Name : RT62E*/W*/K*/U*/V*/Z* (Model Code) RT58E*/W*/K*/U*/Z* RT53E*, RT49E* REFRIGERATOR CONTENTS PRECAUTIONS PRODUCT SPECIFICATIONS .8 DISASSEMBLY AND ASSEMBLY 17 TROUBLE SHOOTING 31 ILLUSTRATED PARTS CATALOG .52 PCB DIAGRAM 75 WIRING DIAGRAM 77 RT62E/U/Z RT58E/U/Z RT62W/K/V RT58W/K/V RT53/49E CIRCUIT DIAGRAM 78 REFERENCE INFORMATION .80 For the latest information, Please access to our service web site ( North America : http://service.samsungportal.com Latin America : http://latin.samsungportal.com CIS : http://cis.samsungportal.com Europe : http://europe.samsungportal.com Asia : http://aisa.samsungportal.com Mideast & Africa : http://mea.samsungportal.com WARNING IMPORTANT SAFETY NOTICE The service guide is for service personal with adequate electrical, electronic and mechanical experience Any attempt to repair a major appliance may result in personal injury and property damage The manufacturer or dealer cannot be responsible for the interpretation of this information SAMSUNG ELECTRONICS Technical Service Guide Copyright 2008 All rights reserved This service guide may not be reproduced in whole or in part in any form without written permission from the SAMSUNG ELECTRONICS Company Contents PCB DIAGRAM 6-1) Part Arrangement (Main Board) 10 11 75 PCB DIAGRAM 6-2) Connector Arrangement (Main Board) CN31 - Sensor : Ambient : OPEN : CN73 - R-Room Damper ~ : Damper Heater ~ : Damper Motor CN10 - AC INPUT : NEUTRAL : LIVE CN30 - Sensor & Switch : F-Door Switch : GND : F-Sensor : F-DEF-Sensor : R-Door Switch : GND : R-Sensor : OPEN CN72 - BLDC Motor : C-FAN operation signal OPEN : F-FAN operation signal : C-FAN signal input volt OPEN : F-FAN signal input volt : CN50 DISPLAY : Display Switch input : Display LED Driver : OPEN CN70 - AC LOAD : F-LAMP : COMMON LINE(N) : COMP : HEATER COMMON OPEN : COMMON LINE(L) : F-DEF-HEATER CN71 - AC LOAD OPEN : R-LAMP OPEN 76 CIRCUIT DIAGRAM 8-1) BLOCK DIAGRAM 78 CIRCUIT DIAGRAM 8-2) CIRCUIT DIAGRAM 79 SELF DIAGNOSIS & TROUBLE SHOOTING 31 SELF DIAGNOSIS & TROUBLE SHOOTING 4-1) CHECK POINT BEFORE TROUBLESHOOTING 4-1-1 TEST (FORCED OPERATION / FORCED DEFROST) When pressing the Fridge button and the Super freeze button on PANEL DISPLAY simultaneously for more than 8sec, PANEL DISPLAY will be turned off and it is in TEST MODE At this point, the Freezer and the Fridge buttons, the Super freeze button, and the Vacation button can be pressed and it becomes the TEST button When pressing TEST buttonnnn, Test function shall be in order Forced Operation Forced F Cancellation (normal operation) Forced Operation Defrost To cancel TEST function, turn off the power and turn it on again Press for sec Forced Operation 1) When pressing TEST button while in TEST MODE, Forced Operation will be selected and a BEEP sound, the alarm will go off 2) If Forced Operation is selected, compressor operates instantly without delay At this point, if it is in Defrost, Defrost will be stopped instantly 3) When in Forced Operation, compressor and F FAN operate for 24 hr continuously and Fridge will be regulated by the set temp Forced operation continues until the completion or changing the MODE to forced F Defrost or cancellation 4) In forced operation, Freezer will be selected to “MAX -25 and Fridge will be set to “1 automatically However, if Forced Defrost or Test Cancellation is selected after a minute while in forced operation, the max set temp will not change (Maintaining “MAX -25 and “1 ) If forced defrost or test cancellation are selected within a minute while in forced run operation, the set temp will go back to the previous setting 5) On the completion of Forced Run (24 hr.), F Defrost shall be activated regardless of the previous state 6) After the above items are satisfied, it operates under normal defrosting conditions by sensing ambient temp and compressor run time 7) During forced operation, Super Freeze will not function and the selected function, LED will be off after sec Forced Defrost 1) When pressing TEST button twice while in TEST MODE, Freezer defrost will operate and beeping sound will be heard 2) Beeping sound will be heard until the completion of the defrost cycle and then pause 3) With the selection of forced F defrost, it will operate regardless of HEATER ON temp and complete defrost while comparing the HEATER OFF temp TEST Cancellation MODE 1) When in TEST MODE and pressing the TEST button once more during F Defrost, F Defrost will be cancelled and restored to normal operation Also, if POWER is turned off and on, all the TEST functions will be canceled 32 SELF DIAGNOSIS & TROUBLE SHOOTING 4-1) CHECK POINT BEFORE TROUBLESHOOTING Example of application) For decreasing the standard temp of Freezer by -3 Super Freeze S/W Freezer Fridge Freezer S/W Vacation S/W Fridge S/W Option Setting Set Value Example of application) for of increasing the standard temp of Fridge by +1.5 Super Freeze S/W Freezer Fridge Freezer S/W Vacation S/W Fridge S/W Option Setting Set Value 37 SELF DIAGNOSIS & TROUBLE SHOOTING 4-1) CHECK POINT BEFORE TROUBLESHOOTING 4-1-5 OPTION TABLE note) When using the temp set button in Freezer and Vacation button, all other options except for the above mentioned are ALREADY set Those are the items related to the refrigerator control and they will be omitted (Do not set other options except for those in the above A/S MANUAL Table for changing temp in Freezer Freezer TEMP SHIFT SET ITEM DISPLAY Table for changing temp in Fridge Fridge TEMP SHIFT SET ITEM LOCATION : Fridge 7-SEG DISPLAY LOCATION : Fridge 7-SEG SET VALUE TEMP Freezer 7-SEG SET VALUE SET VALUE TEMP Freezer 7-SEG TEMP Freezer 7-SEG SET VALUE TEMP Freezer 7-SEG 0 +0.5 0 +0.5 -0.5 +1.0 -0.5 +1.0 -1.0 10 +1.5 -1.0 10 +1.5 -1.5 11 +2.0 -1.5 11 +2.0 -2.0 12 +2.5 -2.0 12 +2.5 -2.5 13 +3.0 -2.5 13 +3.0 -3.0 14 +3.5 -3.0 14 +3.5 -3.5 15 +4.0 -3.5 15 +4.0 38 SELF DIAGNOSIS & TROUBLE SHOOTING 4-2 Troubleshooting flowchart Data Temperature table Resistance and MICOM port voltage of sensor by temperature Sensor chip: PX41C Voltage Resistance Voltage Resistance 39 Voltage Resistance SELF DIAGNOSIS & TROUBLE SHOOTING 4-2-1 In case of self diagnosis error - Sensor error is displayed on the front display of the refrigerator In case of a sensor error at the initial power connection, the refrigerator will not operate and repeatedly display (flash) the sensor part with the error - In case of a sensor error during operation, the refrigerator will not top but operate in emergency operation mode and normal cooling operation may not work Check and diagnose the problem by using this self diagnosis function in this manual 1) R sensor error Start Is the inserted condition of main PCB connector CN30 normal? Connector contact error/Reinsert Data Temperature table Resistance measuring location by sensor R:Measure resistance between CN30 No and No refers to short and refer to open error Is the R sensor item normal? Replace temperature sensor Refer to the circuit diagram in this manual Is the voltage of main PCB connector CN-30-”7” and “6” normal? Sensor MICOM/Connector number R Connector CN30-”7”-”6” Voltage is measured between 4.6V and 0.6V (0.6V>Measured value “7” (Gray) - Compare with temperature table after measurement R sensor voltage checking method - Sensor checkpoint on PCB:Measure voltage of IC01 MICOM #59 or CN30-”7” (Gray) > “6” (Brown) - Compare with temperature table after measurement Measure voltage of CN30-”7” (Gray) > “6” (Brown) as shown below 40 SELF DIAGNOSIS & TROUBLE SHOOTING 2) Ambient sensor error Start Is the inserted condition of main PCB connector CN31 normal? Connector contact error/Reinsert Data Temperature table Resistance measuring location by sensor Ambient:Measure resistance between CN31 No and No refers to short and refer to open error Refer to the circuit diagram in this manual Sensor MICOM/Connector number R Connector CN31-”1” and ”4” Voltage is measured between 4.6V and 0.6V IC1 MICOM #63 voltage is the same as CN31-”1” (White) Is the ambient sensor item normal? Replace temperature sensor Is the voltage of main PCB connector CN-31-”1” (White) and CN1-”4” (White) normal? (0.6V>Measured value “4” (White) - Compare with temperature table after measurement Ambient sensor voltage checking method - Sensor checkpoint on PCB: Measure voltage of IC01 MICOM #63 or CN31-”1” (White) > “4” (White) - Compare with temperature table after measurement Measure voltage of CN31-”1” (White) > “4” (White) as shown below 41 SELF DIAGNOSIS & TROUBLE SHOOTING 3) F sensor error Start Is the inserted condition of main PCB connector CN30 normal? Connector contact error/Reinsert Data Temperature table Resistance measuring location by sensor F: Measure resistance between CN30 No and No refers to short and refer to open error Refer to the circuit diagram in this manual Sensor MICOM/Connector number R Connector CN31-”1” and ”4” Voltage is measured between 4.6V and 0.6V IC1 MICOM #56 voltage is the same as CN30-”3” (Yellow) Is the F sensor item normal? Replace temperature sensor Is the voltage of main PCB connector CN-30-”3” (Yellow) and “2” (Purple) normal? (0.6V>Measured value “2” (Purple) - Compare with temperature table after measurement F sensor voltage checking method - Sensor checkpoint on PCB: Measure voltage of IC01 MICOM #56 or CN30-”3” (Yellow) > “2” (Purple) - Compare with temperature table after measurement Measure voltage of CN30-”3” (Yellow) > “2” (Purple) as shown below “2” and “6” are the same GND 42 SELF DIAGNOSIS & TROUBLE SHOOTING 4) F DEF sensor error Start Is the inserted condition of main PCB connector CN30 normal? Connector contact error/Reinsert Data Temperature table F-DEF: Measure resistance between CN30 No and No refers to short and refer to open error Refer to the circuit diagram in this manual Sensor MICOM/Connector number F DEF Connector CN30-”4” and ”2” Voltage is measured between 4.6V and 0.6V IC1 MICOM #57 voltage is the same as CN30-”4” (Blue) Is the F DEF sensor item normal? Replace temperature sensor Is the voltage of main PCB connector CN-30-”4” (Blue) and “6” (Purple) normal? (0.6V>Measured value “2” (Gray) - Compare with temperature table after measurement F DEF sensor voltage checking method - Sensor checkpoint on PCB: Measure voltage of IC01 MICOM #57 or CN30-”4” (Blue) > “6” (Brown) - Compare with temperature table after measurement Measure voltage of CN30-”4” (Blue) > “6” (Brown) as shown below 43 SELF DIAGNOSIS & TROUBLE SHOOTING 4-2-2 When the fan is not working - This refrigerator uses BLDC fan motor BLDC motor is a motor operated by DC 7-12V - Generally, the F-FAN motor operates together when the COMP is ON But when the ambient temperature is high and the door is opened/closed once, the operation is delayed for more than minute Please note that this is not an error - In case of an error, first turn the power off and select self diagnosis function, and check the part where the actual error occurs Door & MICOM State Start Door F MICOM(#43) R MICOM(#44) Close 5V(High) 5V(High) Open 0V(Low) 0V(Low) For C-FAN Is the COMP ON? Execute forced operation For F-FAN Is the voltage between main PCB CN72-”4” (Sky-blue) and “7” (Gray) about DC7~12V? Does the voltage between main PCB CN72-”1” (Red) and “7” (Gray) repeatedly below DC 3V? Expected cause FAN-MOTOR defect Check connection defect of the wire connecting part Check the motor rotation pulse input during fan motor operation F FAN pulse voltage CN72-”3”(Black) “7”(Gray) Because this signal is a pulse signal, the voltage changes But when measured with multi-meter, about 2-3V is measured Is the voltage between main PCB CN72-”6” (Yellow) and “7” (Gray) about DC7~12V? Normal fan operation Is the voltage between main PCB CN30-”1” (White/Red) and “2” (Purple) about 5V? Repair door S/W connecting part Turn off the power and then turn on the power after about minutes (Prevent compressor overload) The compressor, freezer/fridge/compressor fan operates when the power is initially connected But when the temperature (5°ΔC of F compartment) is detected due to instant power outage, it operates after minutes Does the voltage between main PCB CN72-”3” (Black) and “7” (Gray) repeatedly below DC 3V? Replace/Repair main PCB Reference Pulse signal generated when the motor is rotating is entered to CN72 No (F) and No (C) This signal is entered to MICOM When the signal is not entered when the motor is operating, turn the power off and then turn it on again after about 10 seconds When the signal is not entered even after this process, repeat this for times If the signal is not entered even after repeating, restart the motor after about 10 minutes This is the function applied to the case when the motor is locked by alien objects such as ice around the motor Display when checking self diagnosis function Expected cause FAN-MOTOR defect Check connection defect of the wire connecting part Check the motor rotation pulse input during fan motor operation F, C FAN motor voltage checking method F FAN;Voltage between PCB common ground CN72-”7” (Gray) and CN72-”6” (Yellow) is within DC 7~12V C FAN; Voltage between PCB common ground CN72-”7” (Gray) and CN72-”4” (Sky-blue) is within DC 7~12V - Check additionally when the resistance differs after measurement 1) F-FAN 2) C-FAN F Fan Error C Fan Error 44 SELF DIAGNOSIS & TROUBLE SHOOTING 4-2-3 When the defrost is not working (F DEF heater) Defrost value measuring location by heater F-DEF: Measure resistance (294 ohm 7%) between CN70 No 13 (Brown) and CN71 No (Orange) refers to short and refer to open (bimetal, heater) error Start Resistance measuring location by sensor F-DEF: Measure resistance between CN30 No and No refers to short and refer to open error Is the F defrost heater normal? Check bimetal, heater disconnection, wire contact condition etc Sensor resistance by temperature 30 20 10 -10 -20 -30 4.22 6.05 8.87 13.29 20.42 32.23 52.41 Refer to Data Temperature table for detail temperature Is the defrost sensor normal by self diagnosis? Refer to self diagnosis function in this manual Replace/Repair applicable sensor Is the temperature of the applicable defrost sensor 12 or below? Resistance measuring location by sensor F-DEF: Measure resistance between CN30 No and No refers to short and refer to open error Execute forced F defrost Execute forced operation for a certain period of time When you press the Vacation key and Fridge key simultaneously for seconds and press any key twice, it enter the test mode (Forced defrost) Is the power connected to the defrost heater? Does it recover to cooling operation after heating for a certain period of time? Recheck for applicable sensor error that is not recovered Reference When the temperature of F defrost sensor is over 10 respectively by the heater, it ends the heating and switches to cooling operation after a break F-DEF heater resistance checking method F DEF: When the resistance is different after measuring the resistance between CN70-”13” (Brown) and “7” (Orange), check dditionally F DEF heater Normal Is the connecting terminal of main PCB normal? Repair connecting terminal Check bimetal, heater disconnection, wire contact condition etc Replace/Repair defective relay or replace PCB assembly 45 SELF DIAGNOSIS & TROUBLE SHOOTING 4-2-4 When the power is not working Caution Because the main PCB power terminal generates AC 220V power and more than DC300V of high voltage, be careful during repair or measurement Start - When repairing the main PCB refer to the operating description and “Reference” part of this manual Is the plug connected? SMPS input voltage checking method CN10 input;AC power between CN1-”1” (Red) and “3” (Black) Reconnect the plug and take actions on loose plug etc Is 220V connected to the ends of SMPS PCB CN10? Check wire assembly condition Is the fuse of SMPS PCB disconnected? SMPS 2nd side voltage (+12V) checking method CN73-”1” > “JP17” Same as C102 ends 1) Replace fuse AC 250V 2.0A 2) Replace PCB assembly Is the fuse of SMPS PCB disconnected? Replace PCB assembly SMPS 2nd side voltage (+5V) checking method C104 ends Same as C103 ends Is the voltage of DC 5.8V connected between TOP S/W 223Y C-S? Replace PCB assembly Is 12V connected to C102 ends? Replace PCB assembly Is 5V connected to C103 ends? Replace PCB assembly Is the operation of panel PCB normal? 1) Check and repair wire assembly 2) Replace panel PCB Is the load including relay etc normally operating? 1) Check whether lead wire is contacting 2) Replace applicable relay (Replace PCB assembly) Is there any solder short and break on PCB? Check door panel PCB connection 1) Rework on solder 2) Replace PCB main Normal (Recheck) 46 SELF DIAGNOSIS & TROUBLE SHOOTING 4-2-5 When the compressor is not working Start Did minutes pass after turn the COMP OFF? Check after minutes Refer to test function in this manual When you execute forced operation, does the compressor work? Was the forced operation buzzer sound generated? (Always check after executing forced operation) Is the freezer sensor normal? Repair open and connected condition Is the IC1 MICOM #18 high? (5V) 1) Replace MICOM 2) Replace PCB Is the main PCB temperature sensor normal? Replace detection part and replace PCB Is the IC3 #14 about 0.8V? 1) Replace IC3 driver (ULN2803) 2) Replace PCB Repair open and connected condition Is the CN70 connector normal? Check connector connection defect Is the COMP assembly normal? Replace/Repair COMP assembly Normal (Recheck) Voltage checking method PCB common ground D104 heat emission plate and 1) IC1 MICOM #18: Voltage high (5V 0.5V) IC02 MICOM #18 when the COMP is operating Voltage checking method PCB common ground D104 heat emission plate and 1) IC1 MICOM #14: Voltage low (0.7V 0.5V) IC3 #14 when the COMP is operating 47 Common PCB ground D104 heat emission plate SELF DIAGNOSIS & TROUBLE SHOOTING 4-2-6 When the alarm is generated continuously (Buzzer sound related) When the ‘Ding Dong’ sound is generated continuously Start Isn’t the door slightly open? Slightly open Remove cause after identifying interference by door gasket, food etc Closed well Is there water penetrated on the door S/W? Replace door S/W Door & MICOM State Door Close Open F MICOM(#43) R MICOM(#44) 5V(High) 0V(Low) 5V(High) 0V(Low) Does the main #43 and #44 input voltage change as the door is opened/closed? Repair wire disconnection and door S/W defect Is the inserted condition of connector (CN30) normal? Separate the door S/W and measure the single product to check whether the changes Repair missing connector and contact defect Is the door S/W itself (item) normal? Replace door S/W Main PCB and door S/W are normal Recheck When the ‘Beep-Beep’ sound is generated continuously Start Isn’t forced operation or forced defrost selected? Selected Cancel forced operation and forced defrost function or turn off the power and then turn on the power again Does the buzzer sound continue after turning on the power again? Main PCB normal Check whether there are any alien particles in the test jumper part within the main PCB and check whether there are any short circuited parts 48 SELF DIAGNOSIS & TROUBLE SHOOTING When there is no buzzer sound generated This model has a buzzer installed (attached) on the main PCB When the buzzer sound is not generated when the button is pressed, when forced operation is executed and when the door is opened, separate the panel PCB to first check for broken buzzer, soldering defect etc Start When you press the button the front panel, is the selection ‘Ding Dong’ sound generated? Main PCB and buzzer normal When you open the freezer or refrigerator door for more than minutes, is the alarm sound generated? Refer to the panel display checking method to execute panel PCB check Is the buzzer of the panel PCB broken or bent? Replace (Repair) buzzer/replace panel PCB Did the part lead drop on the buzzer vibration board? Replace buzzer/replace panel PCB Review button pressing force and mechanical problems 49 SELF DIAGNOSIS & TROUBLE SHOOTING 4-2-7 When the panel PCB is abnormal Start Is the panel PCB connector insertion normal? Reinsert connector and repair contact defect Is the main PCB connector (CN50) insertion normal? Reinsert connector within main PCB Is the main PCB CN50 signal normal? Common PCB ground D104 heat emission plate When panel key is not selected Check voltage/replace main PCB When replacing the panel-PCB, is it normally lit? Panel PCB defect Check panel wire-Check wire disconnection and short between wires Recheck the main PCB pantry panel control circuit Check wire assembled condition between the panel and main When the panel PCB key is not selected * Basic checking method is for when it is not repaired after executing the above process Isn’t the key continuously pressed? Voltage checking method Basically it is based on PCB common ground CN1-”3” (Black) 1) Key voltage : CN50-”1” (Purple) 1) Normal times (0.0V) Pressed Isn’t the key continuously pressed? Doesn’t it still operate continuously when the PCB device is separated? Resolve PCB assembly reassembly/pressed part Operated separately Operates when separated Resolve PCB assembly reassembly/pressed part Is the LED still on when replacing the panel-PCB? Panel PCB defect Does main PCB IC3, and output normal voltage during key operation? Replace main PCB Check for short in main panel wire Check panel wire-Check wire disconnection and short between wires Check for short/open of pantry panel LED circuit part within main PCB 50 SELF DIAGNOSIS & TROUBLE SHOOTING 4-2-8 When the room lamp of the refrigerator is not working When replacing the room lamp of the freezer/refrigerator, there is a possibility of electric shock Therefore you must turn the power off before any replacement or repair For the light bulbs, be careful of heat emitted from the light bulbs * The following will be described based on the example of R-Room lamp Please take same approach based on the same principle and method Start Is the filament of the room lamp is disconnected? Door & MICOM State Door Close Open F MICOM(#43) R MICOM(#44) 5V(High) 0V(Low) Repair room lamp 5V(High) 0V(Low) Is the R-door S/W contact point normal? Reference * Room lamp relay is turned ON/OFF depending on whether the door is opened/closed * When the room lamp is not turned on well, observe the operating noise of the relay * Every time you open/close the door, the relay operating sound will be generated * F-LAMP Relay - RY74 * R-LAMP Relay - RY75 Replace/Repair door S/W Is the room lamp control replay of PCB normal (RY75)? Replace PCB and replace relay Check the R-door S/W connecting part and check/repair the room lamp socket Reference When the door is open, the door S/W contact point becomes open to connect 5V to MICOM for detection When measuring lamp resistance of the wire The resistance changes depending on the lamp input voltage (Below value is the actually measured value and can change depending on the function.) Door switch voltage checking method - Sensor check point on PCB: IC1 MICOM #44 or CN30-”1” (White-blue) > Measure voltage of D104 heat emission plate - Compare with temperature table after measurement Measure voltage of CN30-”1” (White-blue) > D104 heat emission plate as shown below Freezer lamp CN70-”1”(BLUE) ”11”(RED);10Ohm Ohm Lamp ; 15W Common PCB ground D104 heat emission plate Fridge lamp CN71-”5”(Purple) CN70-”11”(RED);15Ohm Ohm Lamp ; 25W 51 ... contact failure, reakage of wire, short circuit, inferior sensor Freezer SEGMENT Dislodged from Heater Housing, contact failure, breakage of wire, short circuit, inferior F-Heater or F DEFROST... sensor error Start Is the inserted condition of main PCB connector CN30 normal? Connector contact error/Reinsert Data Temperature table Resistance measuring location by sensor R:Measure resistance... sensor error Start Is the inserted condition of main PCB connector CN31 normal? Connector contact error/Reinsert Data Temperature table Resistance measuring location by sensor Ambient:Measure resistance