LG CM2460 Service Manual
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LG CM2460 Service Manual

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Internal Use Only
Micro Hi-Fi Audio
SERVICE MANUAL
MODEL: CM2460
(CM2460, CMS2460F)
CAUTION
BEFORE SERVICING THE UNIT, READ THE "SAFETY PRECAUTIONS"
IN THIS MANUAL.
P/NO : AFN77360066
JANUARY, 2016

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  • Page 1 Internal Use Only Micro Hi-Fi Audio SERVICE MANUAL MODEL: CM2460 (CM2460, CMS2460F) CAUTION BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS” IN THIS MANUAL. P/NO : AFN77360066 JANUARY, 2016...
  • Page 2 CONTENTS SECTION 1 ..GENERAL SECTION 2 ..CABINET & MAIN CHASSIS SECTION 3 ..ELECTRICAL SECTION 4 ..REPLACEMENT PARTS LIST...

  • Page 3: Table Of Contents

    SECTION 1 SUMMARY CONTENTS SERVICING PRECAUTIONS ..........................1-3 ESD PRECAUTIONS ............................1-5 HIDDEN KEY MODE ............................1-6 SERVICE INFORMATION FOR EEPROM ......................1-7 PROGRAM DOWNLOAD & UPDATE GUIDE ....................1-8 SPECIFICATIONS ............................. 1-9...

  • Page 4: Servicing Precautions

    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

    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: Hidden Key Mode

    HIDDEN KEY MODE Push both Front key and Remote Control key to activate it for 5 seconds. 1. Check Version and Option code  Front Key : PLAY/PAUSE  Remote Control Key : PLAY/PAUSE  You can change [Audio MCU Version <-> Audio EQ Version <-> EEPROM Option] by SKIP+/-. 2.

  • Page 8: Service Information For Eeprom

    SERVICE INFORMATION FOR EEPROM POWER ON FLD no disc status or PORT.IN status. Front ‘Play/Pause’ + Remote Control ‘Forward skip’ push same timing during 5 seconds. FLD ‘OP00-00’ Move to appropriate position and make changes with remote control ‘skip, sound effect, stop’ key. Press ‘PLAY/PAUSE’...

  • Page 9: Program Download & Update Guide

    PROGRAM DOWNLOAD & UPDATE GUIDE Caution: • When downloading the fi le, you should neither unplug the USB device, change to the other function, nor power off the device. • USB device must be unplugged when the downloading process is completed. If security program (Water Wall) is activated on your PC, you must save the fi...

  • Page 10: Specifications

    SPECIFICATIONS • GENERAL Power requirements Refer to the main label. Power consumption Refer to the main label. Networked standby : 0.5 W (If all network ports are activated.) Dimensions (W x H x D) Approx. 230 mm x 125 mm x 236 mm Net Weight Approx.
  • Page 11 1-10...
  • Page 12 SECTION 2 CABINET & MAIN CHASSIS CONTENTS EXPLODED VIEWS ............................2-3 1. CABINET AND MAIN FRAME SECTION ....................2-3 2. PACKING ACCESSORY SECTION ......................2-7 3. SPEAKER SECTION ..........................2-8...

  • Page 14: Exploded Views

    EXPLODED VIEWS NOTES) THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO ALERT THE SERVICE PERSONNEL 1. CABINET AND MAIN FRAME SECTION TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE LITERATURE. SMPS MAIN CABLE1 DISPLAY CABLE6 CABLE8 CABLE2 CABLE7...

  • Page 16: Packing Accessory Section

    2. PACKING ACCESSORY SECTION Owner’s manual Batteries Remote control Packing, Main Packing, Main 802 Box...

  • Page 17: Speaker Section

    3. SPEAKER SECTION A60L A60R...
  • Page 18 SECTION 3 ELECTRICAL CONTENTS ONE POINT REPAIR GUIDE ..........................3-2 1. NO POWER ............................3-2 2. NO BOOTING WHEN POWER ON THE SET..................3-4 3. VFD IS NOT DISPLAYED WHEN POWER ON THE SET ..............3-5 4. NO OPERATION OF MD ........................3-6 5.

  • Page 19: One Point Repair Guide

    ONE POINT REPAIR GUIDE 1. NO POWER If the unit doesn’t work by no power problem, repair the set according to the following guide. 1-1. FUSE & BRIDGE DIODE 1-1-1. Solution Please check and replace F900, BD900 or TH900 on SMPS board. 1-1-2.
  • Page 20 ONE POINT REPAIR GUIDE NO POWER If the unit doesn’t work by no power problem, repair the set according to the following guide. 1-2. D907 1-2-1. Solution Please check and replace D907 on SMPS board. 1-2-2. How to troubleshoot (Countermeasure) 1) Check the anode-cathod voltage of D907 with a digital multi-meter, it is normally 0.2 ~ 0.3 V.

  • Page 21: No Booting When Power On The Set

    ONE POINT REPAIR GUIDE 2. NO BOOTING WHEN POWER ON THE SET The set doesn’t work when press the power button on the display board or the remote control. 2-1. FLASH MEMORY 2-1-1. Solution Please check and replace IC105 on MAIN board. 2-1-2.

  • Page 22: Vfd Is Not Displayed When Power On The Set

    ONE POINT REPAIR GUIDE 3. VFD IS NOT DISPLAYED WHEN POWER ON THE SET When power on the set, any icons or characters on VFD are not displayed. 3-1. VFD 3-1-1. Solution Please check and replace VFD300 on DISPLAY board. 3-1-2.

  • Page 23: Cable6

    ONE POINT REPAIR GUIDE 4. NO OPERATION OF MD When no sound output in the CD function, you can not listen to music reading data from a CD disc if the servo motors in MD don’t work. This step is for checking the SPINDLE MOTOR among them. 4-1.

  • Page 24: No Operation Of Md

    ONE POINT REPAIR GUIDE NO OPERATION OF MD When no sound output in the CD function, you can not listen to music reading data from a CD disc if the servo motors in MD don’t work. This step is for checking the SLED MOTOR among them. 4-2.
  • Page 25 ONE POINT REPAIR GUIDE NO OPERATION OF MD When no sound output in the CD function, you can not listen to music reading data from a CD disc if the servo motors in MD don’t work. This step is for checking the TRAY OPEN/CLOSE MOTOR among them.
  • Page 26 ONE POINT REPAIR GUIDE NO OPERATION OF MD When no sound output in the CD function, you can not listen to music reading data from a CD disc if the pickup module in MD doesn’t work. This step is for checking the LASER TRACKING ACTUATOR. 4-4.
  • Page 27 ONE POINT REPAIR GUIDE NO OPERATION OF MD When no sound output in the CD function, you can not listen to music reading data from a CD disc if the pickup module in MD doesn’t work. This step is for checking the LASER FOCUSING ACTUATOR. 4-5.
  • Page 28 ONE POINT REPAIR GUIDE 5. NO SOUND There is no sound output in the CD FUNCTION, repair the set according to the following guide. 5-1. IN THE CD FUNCTION 5-1-1. Solution Please check and replace IC105, IC700 on MAIN board. 5-1-2.

  • Page 29: No Sound

    ONE POINT REPAIR GUIDE NO SOUND There is no sound output by DIGITAL AUDIO AMP DAMAGE, repair the set according to the following guide. 5-2. BY DIGITAL AUDIO AMP DAMAGE (IN ALL FUNCTIONS) 5-2-1. Solution Please check and replace IC700, IC701 on MAIN board. 5-2-2.
  • Page 30 ONE POINT REPAIR GUIDE NO SOUND There is no sound output in the USB FUNCTION, repair the set according to the following guide. 5-3. IN THE USB FUNCTION 5-3-1. Solution Please check and replace IC105 on MAIN board and DISPLAY board. 5-3-2.
  • Page 31 ONE POINT REPAIR GUIDE NO SOUND There is no sound output in the AUX FUNCTION, repair the set according to the following guide. 5-4. IN THE AUX FUNCTION 5-4-1. Solution Please check and replace IC400 on MAIN board. 5-4-2. How to troubleshoot (Countermeasure) 1) Check AUDIO_RIN, AUDIO_LIN signals to IC400 pin1, 2.
  • Page 32 ONE POINT REPAIR GUIDE NO SOUND There is no sound output in the TUNER FUNCTION, repair the set according to the following guide. 5-5. IN THE TUNER FUNCTION 5-5-1. Solution Please check and replace IC400, IC402 on MAIN board. 5-5-2. How to troubleshoot (Countermeasure) 1) Check if TUL_L/R is entered from pin13, 14 of IC402 to IC403 pin1, 12.

  • Page 33: Electrical Troubleshooting Guide

    ELECTRICAL TROUBLESHOOTING GUIDE 1. POWER (SMPS) No 5.1 VA F900 normal? Replace F900 (Use the same fuse). BD900 normal? Replace BD900. TH900 normal? Replace TH900. Is Vcc (10 V ~ 18 V) supplied to D903 normal? IC904 pin3? Check or replace D903. D906 normal? Replace D906.
  • Page 34 ELECTRICAL TROUBLESHOOTING GUIDE No PVDD (24.5 V) F900 normal? Replace F900 (Use the same fuse). BD900 normal? Replace BD900. TH900 normal? Replace TH900. Is Vcc (14 V ~ 26 V) supplied to D903 normal? IC901 pin6? Check or replace D903. Q901 base HIGH? •...
  • Page 35 ELECTRICAL TROUBLESHOOTING GUIDE No 12 V Is Vcc (12 V) Check or replace D906. supplied to D906? Q905 pin2 “HIGH”? Check P_CTRL HIGH signal from MCS. Check or replace Q905. No VFD Is VFD (5 V) supplied to PN100 pin1? Check or replace D301.

  • Page 36: Mcs Part Check

    ELECTRICAL TROUBLESHOOTING GUIDE 2. MCS PART CHECK MCS PART CHECK Check if voltage Refer to SMPS troubleshooting. of PN200 pin8 is 5.2 V. Check if IC203 Check and change IC203. have 3.3 V output. Check if IC204 Check and change IC204. have 1.2 V output.

  • Page 37: Fld Display Check

    ELECTRICAL TROUBLESHOOTING GUIDE 3. FLD DISPLAY CHECK FLD DISPLAY CHECK Check Refer to SMPS/MPEG PN100 pin1 input troubleshooting. voltage 5 V. Check D301 Check and change D301. input votltage 5 V? Check T300 Check and change pin6, 7 Output votltage AC 2.6 V. Check D302 pin1 Output Q301, Q303, Q305, Q306.

  • Page 38: Pwm Modulation Check

    ELECTRICAL TROUBLESHOOTING GUIDE 4. PWM MODULATION CHECK PWM MODULATION PART CHECK Check Refer to PN200 pin8 SMPS troubleshooting. (5.2 V) • Check IC700 (PS9860) VDD 3.3 V - pin6,17, 34, 43, 52. • Check X700 (24.576 MHz). Check Check X700 Replace X700 (24.576 MHz).

  • Page 39: Power Amp Part Check

    ELECTRICAL TROUBLESHOOTING GUIDE 5. POWER AMP PART CHECK POWER AMP PART CHECK Check PN200 Refer to SMPS troubleshooting. pin7: +12 V, pin1, 2: 24.5 V. Check IC701 pin29, 30, 31, 36, 37, 38 input voltage (24.5 V). Check each line resistor output voltage. Check IC701 pin2: +12 V input.

  • Page 40: Tuner / Aux Function Check

    ELECTRICAL TROUBLESHOOTING GUIDE 6. TUNER / AUX FUNCTION CHECK FUNCTION CHECK Check IC403 (BU4052) pin5, 14 (AUX), Check CON105, IC402. pin1, 12 (TUNER) input. Check IC403 Check IC403 Check PN200 pin7: +12 V. (BU4052) pin3, 13 output pin16: 12 V. data.

  • Page 41: Tuner Function Check

    ELECTRICAL TROUBLESHOOTING GUIDE 7. TUNER FUNCTION CHECK TUNER FUNCTION CHECK Check IC402 (pin11: +3.3 V). Check Q204 Input voltage (5.1 V). Replace Q204. Check IC402 pin8(SDA), pin7(SCL). IC105 (MLC3730) output data. Refer to function check. 3-24...

  • Page 42: Cd Function Check

    ELECTRICAL TROUBLESHOOTING GUIDE 8. CD FUNCTION CHECK CD FUNCTION Is Motor_open/close ok? Can the Is load +,- ok? (IC801 pin6, 7) disc insert? Check IC801. Is Motor ok? (about 12 Ω) Check loading motor. Check IC801 (Motor drive IC). Focus, IM driving Disc reading tracking, sled signal...

  • Page 43: Double Usb Function

    ELECTRICAL TROUBLESHOOTING GUIDE 9. DOUBLE USB FUNCTION USB FUNCTION Plug-in USB device. Check CN301. Check USB_5V. Display “NO USB”. Check USB_D+, D- Check USB jack (JK300). Display “READ”. (L303, L306) Display “NO FILE”. Check IC105 pin “U7”, “U8” Replace IC105. Check USB audio file in USB device (MP3, WMA file is playable) 3-26...

  • Page 44: Waveforms Of Major Check Point

    WAVEFORMS OF MAJOR CHECK POINT 1. SDRAM 2. SERVO CD-16M DATA ADDRESS Figure 1. Figure 2. 3-27...

  • Page 45: Audio Path

    3. AUDIO PATH DAC_MCLK CD_BCK DAC_BCK CD_LRCK DAC_LRCK CD_DATA DAC_DATA Figure 3-1. Figure 3-2. 3-28...

  • Page 46: Usb

    4. USB USB_5V Figure 4. 13 14 3-29...
  • Page 47 3-30...

  • Page 48: Wiring Diagram

    WIRING DIAGRAM FM ANT AC IN CD Pickup SPK jack AC IN DA11VP_SLM CD Pickup MAIN motor plug SMPS USB plug BT plug Display plug BT module SMPS plug Port. plug Display PCB KEY PCB 3-31 3-32...

  • Page 49: Block Diagrams

    BLOCK DIAGRAMS 1. SYSTEM BLOCK DIAGRAM 16.9344 MHz Amplifier Bluetooth 50 W/6 Ohm +12 V DA11VZ_SLM PS9860 TAS5612L MB8811C1B A,B,C,D,E,F +24 V Taiyo LIMIT SW 50 W/6 Ohm SERVO BU9546 3.3 V MPEG 5.2 V DI/DO TG1103 ROHM CD-RW Main chip IC MD SWITCH BUSY CD5888...

  • Page 50: Smps Block Diagram

    2. SMPS BLOCK DIAGRAM +5.2 V, 1.5 A 22 uF/450 V +12 V, 500 mA POWER IC 2/EMI OB2358 EEL22 1/EMI 100 uF/450 V +24 V, 3.5 A PWM IC FUSE 10.6 A 3.15 A OB5269 ERL2834 AC IN 110 V~240 V 3-35 3-36...

  • Page 51: Power Block Diagram

    3. POWER BLOCK DIAGRAM SMPS USB_CTRL 120 mA +5 V 0.5 A BT100 IC200 LDO IC803 IC105/MCS IC103/SDRAM IC104/RESET IC201/RESET IC102/FLASH IC101/FLASH USB PWR BULETOOTH APS2401 1.2V MLC3730 M12L64164A AZ7027 AZ7027 16 MB 1 MB TG1103 MB8811C0 3.3V_VCC 70 mA 2 mA 2 mA 38 mA...

  • Page 52: Circuit Voltage Chart

    CIRCUIT VOLTAGE CHART 1. ICs 2. CAPACITORS SPEC SPEC 288 V/ 50 Hz LOCATION NO. DESCRIPTION VCC/VDD LOCATION NO. DESCRIPTION VCC/VDD Location Value (uF) Voltage_Spec (Temperature) (Temperature) voltage Temperature: Temperature: C190 470 uF 10 V 3.21 V 25Q32 VCC: 2.7 ~ 5.5 V PS9860 VDD: 3.0 ~ 3.6 V -40 ~ 85 °C...

  • Page 53: Printed Circuit Board Diagrams

    PRINTED CIRCUIT BOARD DIAGRAMS 1. SMPS P. C. BOARD (TOP VIEW) NOTE) Warning Parts that are critical with respect to risk of fire or electrical shock. 3-55 3-56...
  • Page 54 SMPS P. C. BOARD (BOTTOM VIEW) 3-57 3-58...
  • Page 55 2. MAIN P. C. BOARD (TOP VIEW) 3-59 3-60...

  • Page 56: Main P.c.board

    MAIN P. C. BOARD (BOTTOM VIEW) 3-61 3-62...
  • Page 57 3. DISPLAY P. C. BOARD (TOP VIEW) 3-63 3-64...

  • Page 58: Display P. C. Board

    DISPLAY P. C. BOARD (BOTTOM VIEW) 3-65 3-66...

  • Page 59: Key P. C. Board

    4. KEY P. C. BOARD (TOP VIEW) (BOTTOM VIEW) 3-67 3-68...
  • Page 60 3-69 3-70...

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