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LG CM2440 Service Manual
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LG CM2440 Service Manual

LG CM2440 Service Manual

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Internal Use Only
Website http://biz.lgservice.com
Micro Hi-Fi System
SERVICE MANUAL
MODEL: CM2440
(CM2440, CMS2440F)
CAUTION
BEFORE SERVICING THE UNIT, READ THE "SAFETY PRECAUTIONS"
IN THIS MANUAL.
P
N /
O
:
A
F
N
7
6
6
1
5
0
76
JULY
,
2
0
1
4

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Summary of Contents for LG CM2440

  • Page 1 Internal Use Only Website http://biz.lgservice.com Micro Hi-Fi System SERVICE MANUAL MODEL: CM2440 (CM2440, CMS2440F) CAUTION BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS” IN THIS MANUAL. JULY...
  • Page 2 CONTENTS SECTION 1 ..GENERAL SECTION 2 ..CABINET & MAIN CHASSIS SECTION 3 ..ELECTRICAL SECTION 4 ..REPLACEMENT PARTS LIST...
  • Page 3 SECTION 1 SUMMARY CONTENTS SERVICING PRECAUTIONS ........................1-3 ESD PRECAUTIONS ..........................1-5 OPTION & HIDDEN KEY .......................... 1-6 1. HOW TO CHECK S/W VERSION NUMBER? 2. HOW TO MAKE A SYSTEM RESET? 3. HOW TO SET THE SYSTEM OPTION? 4. HOW TO SET THE DOOR LOCK OPTION? 5.
  • Page 4 SERVICING PRECAUTIONS NOTES REGARDING HANDLING OF THE PICK-UP 1. Notes for transport and storage 1) The pick-up should always be left in its conductive bag until immediately prior to use. 2) The pick-up should never be subjected to external pressure or impact. Storage in conductive bag Drop impact 2.
  • Page 5 NOTES REGARDING COMPACT DISC PLAYER REPAIRS 1. Preparations 1) Compact disc players incorporate a great many ICs as well as the pick-up (laser diode). These components are sensitive to, and easily affected by, static electricity. If such static electricity is high voltage, components can be damaged, and for that reason components should be handled with care.
  • Page 6 ESD PRECAUTIONS Electrostatically Sensitive Devices (ESD) Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called Electrostatically Sensitive Devices (ESD). Examples of typical ESD devices are integrated circuits and some field-effect transistors and semiconductor chip components. The following techniques should be used to help reduce the incidence of component damage caused by static electricity.
  • Page 7 OPTION & HIDDEN KEY 1. How to check S/W version number? Step 1: Press and hold Stop key (Set) + Press and hold Play key (RMC). "CM2540_VER03_01/17_000 MCU VER03" ----------- -------- ------ ----------- Bx8805 Month/Date Option Sub MCU Step 2: To return to Previous screen, repeat Step1 operation. Step 3: In Step1 status, if press Prev Key on set, full screen display will be appeared.
  • Page 8 4. How to set the door lock option? Step 1: In CD mode, press and hold Stop key (Set) + Press and hold Stop key (RMC). "LOCKED" : after setting, the CD Door can`t be opened. Step 2: In CD mode, to change "Unlock" option, press and hold Stop key (Set) + Press and hold STOP Key (RMC). "UNLOCKED"...
  • Page 9 SPECIFICATIONS • GENERAL Power supply Refer to the main label. Power consumption Refer to the main label. Net Weight 2.2 kg External dimensions (W x H x D) (229 x 130 x 236) mm Operating conditions Temperature 5 °C to 35 °C (41 °F to 95 °F) Operating humidity 5 % to 85 % •...
  • Page 10 SECTION 2 CABINET & MAIN CHASSIS CONTENTS EXPLODED VIEWS ............................. 2-3 1. CABINET AND MAIN FRAME SECTION (CM2440) ................2-3 2. PACKING ACCESSORY SECTION ......................2-7 3. SPEAKER SECTION (CMS2440F)......................2-8...
  • Page 11 MEMO...
  • Page 12 EXPLODED VIEWS NOTES) THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO ALERT THE SERVICE PERSONNEL 1. CABINET AND MAIN FRAME SECTION (CM2440) TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE LITERATURE. SMPS MAIN 300A CONTROL DISPLAY CABLE1...
  • Page 13 MEMO MEMO...
  • Page 14 2. PACKING ACCESSORY SECTION 801 Instruction Ass'y 900 Remote Control 808 Battery 803 Packing 804 Bag 803 Packing 802 Box...
  • Page 15 3. SPEAKER SECTION (CMS2440F)
  • Page 16 SECTION 3 ELECTRICAL CONTENTS ELECTRICAL TROUBLESHOOTING GUIDE ....................3-2 1. SMPS PART ............................3-2 2. AUDIO ABNORMAL ..........................3-5 3. IC1 ABNORMAL ............................. 3-7 4. U17 ABNORMAL ............................ 3-7 5. U8 ABNORMAL ............................3-8 6. TU400 ABNORMAL ..........................3-8 7. CD PART ..............................3-9 8.
  • Page 17 ELECTRICAL TROUBLESHOOTING GUIDE 1. SMPS PART 6.8 V Is FS1101 normal? Replace FS1101(Use same type fuse). Is BD1101 normal? Replace BD1101. Is Vcc(10 V ~ 25 V) Is D1103 normal? supplied to IC1101 pin5? Check or replace D1103. Is D1111 normal? Replace D1111.
  • Page 18 ELECTRICAL TROUBLESHOOTING GUIDE 12 V Is FS1101 normal? Replace FS1101(Use same type fuse). Is BD1101 normal? Replace BD1101. Is Vcc(10 V ~ 25 V) Is D1103 normal? supplied to IC1101 pin5? Check or replace D1103. Is D1110 normal? Replace D1110. Power line of main PCB is short.
  • Page 19 ELECTRICAL TROUBLESHOOTING GUIDE 24 V Is FS1101 normal? Replace FS1101(Use same type fuse). Is BD1101 normal? Replace BD1101. Is Vcc(10 V ~ 25 V) Is Q1103 or IC1103 normal? supplied to IC1102 pin7? Check or replace Q1103 or IC1103. Is D1108, D1109 normal? Replace D1108, D1109.
  • Page 20 ELECTRICAL TROUBLESHOOTING GUIDE 2. AUDIO ABNORMAL Audio abnormal Check the output of Check the connection of speakers. U21 pin6, 9, 10, 13. Check the input signal of U21. Check the U809 or U507 or U10 normal? Check the power circuit. Check the “High”...
  • Page 21 ELECTRICAL TROUBLESHOOTING GUIDE CD/ USB Check the output signal of U3 pin34, 35, 36. Check U507 normal? Tuner Check the output signal Check the input signal of U13 pin1, 12. of TU400 pin5, 6. Check the output signal signal of U13 pin3, 13. Check the output signal of U22 pin1, 7.
  • Page 22 ELECTRICAL TROUBLESHOOTING GUIDE 3. IC1 ABNORMAL IC1 abnormal Check the power supply to IC1 pin6. Refer to power circuit troubleshooting. Check the low of IC1 pin5. Check the high of Q301 pin1. Check the control function. Check or replace IC1. 4.
  • Page 23 ELECTRICAL TROUBLESHOOTING GUIDE 5. U8 ABNORMAL U8 abnormal Check the power supply to U8 pin2. Refer to U17 abnormal. Check the power supply to U8 pin3. Check or replace U8. 6. TU400 ABNORMAL TU400 abnormal Check the power supply to TY400 pin3. Check Q5, Q4 normal? Check the high of Q4 pin1.
  • Page 24 ELECTRICAL TROUBLESHOOTING GUIDE 7. CD PART Turn on CD Check open / close. Check CN2. Check U4 pin9. 10.. Check “READING” display. Check PN1. Check Reading OK. Check PN1. Check pick-up movement. Check U4, CN2. Check U4. Playing, check audio output. Check U3 pin19, 20.
  • Page 25 ELECTRICAL TROUBLESHOOTING GUIDE 8. CD READING CHECK Check connector locking PN1, CN2 Check CN2 Defective pick-up or U3, U4. Does sled motor move? pin1, 2 (SL+, SL-). Check PN1 Defective pick-up or U3, U4. Does the laser move? pin6, 9 (F+, F-). Check PN1 Does laser light? Defective pick-up or Q4.
  • Page 26 ELECTRICAL TROUBLESHOOTING GUIDE 9. USB PART Turn on USB Check Power supply circuit Check “CHECKING” Check connector locking IC260 pin5 +5V. or “USB” display. U15 pin1, 5. Check IC260 Check reading. Check USB1 pin1_5V. pin2, 3 (D+, D-). Check IC260 pin6, 7 (D+, D-).
  • Page 27 WAVEFORMS OF MAJOR CHECK POINT 1. WHEN POWER ON, RESET & DATA ETC WAVEFORM LCD_RESET RESET (CD) LCD_CLK CLK (FLASH) F_DI F_DO LCD_DATA Figure 1-1. CD Figure 1-2. LCD 3-12...
  • Page 28 2. STARTING ACTION WAVEFORM IN MD DEVICE (SLED HOME) Figure 2. At power on 3-13...
  • Page 29 3. AT FIRST ACTION, FOCUS SIGNAL A, B, C, D Figure 3. 3-14...
  • Page 30 4. WHEN USB FUNCTION OPERATING USB_5V USB_P USB_N Figure 4. USB playing 17 18 3-15...
  • Page 31 5. RADIO OPERATING TU-RESET/CLK/DATA WAVEFORM TU_RESET TU_CLK TU_DATA Figure 5. 3-16...
  • Page 32 WIRING DIAGRAM 3-17 3-18...
  • Page 33 BLOCK DIAGRAMS 1. SYSTEM BLOCK DIAGRAM 3-19 3-20...
  • Page 34 2. SMPS BLOCK DIAGRAM 3-21 3-22...
  • Page 35 FROM THE ACTUAL CIRCUIT USED. THIS WAY, 2. Voltages are DC-measured with a digital voltmeter 1. SMPS CIRCUIT DIAGRAM FROM THE LG CORPORATION. ALL COMPONENTS IMPLEMENTATION OF THE LATEST SAFETY AND during Play mode. SHOULD BE REPLACED ONLY WITH TYPES PERFORMANCE IMPROVEMENT CHANGES INTO IDENTICAL TO THOSE IN THE ORIGINAL CIRCUIT.
  • Page 36 2. MAIN #1 CIRCUIT DIAGRAM : WAVEFORM NUMBER MAIN-1 2013. 11. 28 3-25 3-26...
  • Page 37 3. MAIN #2 CIRCUIT DIAGRAM : WAVEFORM NUMBER MAIN-2 2013. 11. 28 3-27 3-28...
  • Page 38 4. DISPLAY/ AUX/ USB/ CONTROL CIRCUIT DIAGRAM 17 18 : WAVEFORM NUMBER DISPLAY/AUX/USB/CONTROL 2013. 11. 28 3-29 3-30...
  • Page 39 CIRCUIT VOLTAGE CHART PIN No. Voltage PIN No. Voltage PIN No. Voltage PIN No. Voltage PIN No. Voltage PIN No. Voltage U8 XC6206(1.2V) U21 STA350B W TU400 TUNER MODUL 1.65 3.17 1.65 1.07 0.95 1.68 2.14 1.66 3.32 1.65 1.08 IC2 CS16311 22.4 3.32...
  • Page 40 PRINTED CIRCUIT BOARD DIAGRAMS 1. SMPS P.C.BOARD (TOP VIEW) (BOTTOM VIEW) NOTE) Warning Parts that are critical with respect to risk of fire or electrical shock. 3-33 3-34...
  • Page 41 2. MAIN P.C.BOARD (TOP VIEW) (BOTTOM VIEW) 3-35 3-36...
  • Page 42 3. DISPLAY P.C.BOARD (TOP VIEW) (BOTTOM VIEW) 4. CONTROL P.C.BOARD (TOP VIEW) (BOTTOM VIEW) 3-37 3-38...
  • Page 43 5. USB P.C.BOARD (TOP VIEW) (BOTTOM VIEW) 6. AUX P.C.BOARD (TOP VIEW) (BOTTOM VIEW) 3-39 3-40...

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Cms2440f