LG MCD112 Service Manual
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LG MCD112 Service Manual

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Internal Use Only
Website http://biz.lgservice.com
MINI Hi-Fi SYSTEM
SERVICE MANUAL
MODEL : MCD112 (MCS112F)
CAUTION
BEFORE SERVICING THE UNIT, READ THE "SAFETY PRECAUTIONS"
IN THIS MANUAL.
P/NO : AFN72956656
APRIL, 2009

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  • Page 1 Internal Use Only Website http://biz.lgservice.com MINI Hi-Fi SYSTEM SERVICE MANUAL MODEL : MCD112 (MCS112F) CAUTION BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS” IN THIS MANUAL. P/NO : AFN72956656 APRIL, 2009...

  • Page 2: Table Of Contents

    PARTS LIST ..........5-1 14. TAPE REC PART CHECK ......3-12 INTERNAL BLOCK DIAGRAM OF ICs ....3-13 1. ES6838 ............3-13 2. HA12237F...........3-14 Copyright © 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 3: Servicing Precautions

    Take care not to use too much of this alcohol on the swab, and do not allow the alcohol to get inside the pick-up. LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 4: Notes Regarding Compact Disc Player Repairs

    NOTE: 1. To operate the RESET jump wire, pull the volume rotary knob and release it. 2. If you wish to operate the RESET jump wire, it is necessary to unplug the power cord. Copyright © 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only...

  • Page 5: Esd Precautions

    THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE LITERATURE. LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 6: Location Of Users Controls

    (not Control the volume when using any function. supplied). 11.USB connector - OPTIONAL Connect a remote USB compatible player here. Copyright © 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 7: Remote Control

    Title, Artist or Album. Press INFO while a file is playing to see this information. If there are no tags, “NO ID3 TAG” or “NO WMA TAG” will show. LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 8: Specifications

    Impedance 4Ω Rated Input Power Max. Input Power 100W Net Dimensions (WxHxD) 200 x 337 x 228mm Net Weight (1EA) 2.92kg Copyright © 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 9 MEMO LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 10: Cabinet Exploded View

    SECTION 2 EXPLODED VIEWS CABINET EXPLODED VIEW CABLE4 CN806 MAIN CABLE2 CABLE3 P9701 CABLE5 SMPS P9702 CABLE1 CN201 Copyright © 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 11: Tape Deck Mechanism Exploded View

    1. TAPE DECK MECHANISM (A/S & A/S : RIGHT A/S DECK) BRASS MOTOR PULLEY MAYBE CHANGED FOR WOW FLUTTER WHEN NECESSARY RING FW MAYBE ADDED FOR WOW FLUTTER WHEN NECESSARY LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 12: Tape Deck Mechanism (A/S & A/S : Left A/S Deck)

    2. TAPE DECK MECHANISM (A/S & A/S : LEFT A/S DECK) RING FW MAYBE ADDED FOR WOW FLUTTER WHEN NECESSARY Copyright © 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 13: Cd Mechanism Exploded View

    CD MECHANISM EXPLODED VIEW LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 14: Speaker Exploded View

    SPEAKER EXPLODED VIEW MODEL : MCS112F A80L A80B A80R A80AL A80AR 850L 850R WIRE80 2-10 Copyright © 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 15 MEMO MEMO 2-11 2-12 LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 16: Packing Accessory View

    PACKING ACCESSORY VIEW 2-13 Copyright © 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 17 MEMO LGE Internal Use Only 2-14 Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 18: Audio Part Electrical

    If DC V is 6.1V Chcek the DC V of C950, C951 Check short of P9701 line If DC V is in 31.5V Copyright © 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 19: P-Sens

    (KIA7042). IC101(KIA7042) is (KIA7042). (KIA7042). over 5V. Check voltage of IC100 Check if IC101(KIA7042) of 78KO/KF2_PIN1. output voltage is over 4.3V. LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 20: Micom Part Check Ii

    Q102_collector 0.6V LOW. IC100_PIN19, 20, 59 are 5V. X101 : 32.768kHz X100 : 9.8304MHz Check Q102. Replace Q102. Check the operation. Copyright © 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 21: Ic103(Ks4Cd21Cs) Check

    Check IC100(78KOKF2)_ PIN 22, 24 Refer to PIN22 Check micom micom troubleshooting DATA PIN24 CLK voltage 5V. Check micom. Replace micom. LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 22: Fld Display Check

    78PIN - > 1PIN 76 PIN - > DO - - > Check DATA in Check IC100. FLD light on? Replace IC100 Check IC100. Copyright © 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 23: Pwm Modulation Part Check

    79 PIN->CLK (P7403). Check Check each LINE IC604(PS9829) DATA registor output. Check PWM input. modulator output. FL:75(+)74(-) FR:71(+)70(-) Check IC604(PS9829). LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 24: Power Amp Part Check

    Each IC PIN4, 6, 14, 16 Power IC700, 701, 702, 703 PIN20, 27, 29, 34 output. Replace the coils Check output line coil. Copyright © 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 25: Aux Function Check

    PIN3, 13 output waveform. Check Check Refer to IC801(MC4580)_PIN4 IC801(MC4580)_PIN 2, 6 SMPS troubleshooting. VSS, PIN8 VDD input waveform. power. Replace IC801 LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 26: Tuner Function Check

    (BU4052)_PIN2,15 input waveform. Replace IC200. Replace IC200. Check IC801(MC4580)_ Check IC801(MC4580)_ PIN4 VSS, PIN8 VDD power. PIN2, 6 input waveform. Replace IC801. Copyright © 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 27: Tape Function Check

    IC601(BU4052)_ PIN2, 15 input waveform. Check IC200(BU4052)_ Check IC801(MC4580)_ PIN16 VDD, PIN8 VSS power PIN2, 6 input waveform. Replace IC200. LGE Internal Use Only 3-10 Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 28: Tape Play Part Check

    IC201_PIN32, 39 and B deck head input IC201_PIN34, 37. Replace IC201. Check IC201 Check IC201_PIN14 Check IC202_PIN10 "HIGH" mute operation. Check IC202. Replace IC202. Copyright © 2009 LG Electronics. Inc. All right reserved. 3-11 LGE Internal Use Only Only for training and service purposes...

  • Page 29: Tape Rec Part Check

    Check L203_PIN2, 3 Check Q205(D1304)_ Check IC100_PIN23 "HIGH" oscillation. base "HIGH". Replace IC202. Check P2203_PIN5, 3 input and PIN8 erase input. LGE Internal Use Only 3-12 Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 30: Internal Block Diagram Of Ics

    Gateway Audio DAC Controller Huffman Descrambler Decoder Transport Servo Controller / RF Video Processor ATAPI DRAM 8051 Digital Interface µController Copyright © 2009 LG Electronics. Inc. All right reserved. 3-13 LGE Internal Use Only Only for training and service purposes...

  • Page 31: Ha12237F

    2. HA12237F LGE Internal Use Only 3-14 Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 32: Ps9829B

    SG18 LED1 Driver SG19 SG20 SG21 SG22 SG23 SG24 Dimming Circuit Grid Driver GR10 GR11 GR12 GR13 GR14 GR15 GR16 Copyright © 2009 LG Electronics. Inc. All right reserved. 3-15 LGE Internal Use Only Only for training and service purposes...

  • Page 33: Str-S6757If1905

    5. STR-S6757IF1905 DRIVE Protection latch Reg& Iconst Delay Burst Start Control Stop Burst MaxON OCP/BD Bottom Selector Soft Start SS/OLP Counter LGE Internal Use Only 3-16 Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 34: Tas5142

    32 V Hardwire Supply VREG OC Limit System Decoupling Power Supply Power Decoupling Supply GVDD (12 V)/VDD (12 V) 12 V Copyright © 2009 LG Electronics. Inc. All right reserved. 3-17 LGE Internal Use Only Only for training and service purposes...

  • Page 35: U1739Ej2V1Ud00/Kf2_E

    ANI0/P20 to oscillator ANI7/P27 A/D converter Voltage REGC FLMD0 regulator RxD6/P14 (LINSEL) INTP0/P120 INTP1/P30 to INTP4/P33 Interrupt control INTP5/P16 INTP6/P140, INTP7/P141 LGE Internal Use Only 3-18 Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 36: Wiring Diagram

    DVD : 1ea 5. DVD MD : 5ea 6. DECK MECHA. : 3ea CD PCB MAIN DOUBLE DECK MECHANISM FRONT PCB 3-19 3-20 Copyright © 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 37: Block Diagrams

    5V(P-SEN S) AC INPUT Switch 6.1V (KIA278R05) IC # 2 P9702 -12V -31. 5V(VKK) FL1-FL2 (4. 5V) FEED BACK 3-21 3-22 LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 38: Main & Front Block Diagram

    14.3178MHz OP/CL BA3308 MIC _SIG TOUC OPAMP H PAD (ALC) STDATA, STCK, STREQ[3] DISPLAY OTI6888 VER.A9 D+ / D-,+5V/G 3-23 3-24 Copyright © 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 39: Schematic Diagrams

    CAL TO THOSE IN THE ORIGINAL CIRCUIT. SPECIAL UNTIL THE NEW SERVICE LITERATURE IS PRINTED. COMPONENTS ARE SHADED ON THE SCHEMATIC 3-25 3-26 LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 40: Main Schematic Diagram

    2. MAIN SCHEMATIC DIAGRAM 3-27 3-28 Copyright © 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 41: Amp Schematic Diagram

    3. AMP SCHEMATIC DIAGRAM 3-29 3-30 LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 42: Deck Schematic Diagram

    4. DECK SCHEMATIC DIAGRAM 3-31 3-32 Copyright © 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 43: Front Schematic Diagram

    5. FRONT SCHEMATIC DIAGRAM 3-33 3-34 LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 44: Key-L Schematic Diagram

    6. KEY-L SCHEMATIC DIAGRAM 7. KEY-R SCHEMATIC DIAGRAM 3-35 3-36 Copyright © 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 45: Printed Circuit Board Diagrams

    PRINTED CIRCUIT BOARD DIAGRAMS 1. MAIN P.C.BOARD (TOP VIEW) 3-37 3-38 LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 46 MAIN P.C.BOARD (BOTTOM VIEW) 3-39 3-40 Copyright © 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 47: Front P.c.board

    2. FRONT P.C.BOARD 3-41 3-42 LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 48: Smps P.c.board

    3. SMPS P.C.BOARD 4. KEY-L P.C.BOARD 5. KEY-R P.C.BOARD 3-43 3-44 Copyright © 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 49 MEMO MEMO 3-45 3-46 LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 50: Cd Part Electrical

    If PALY, AUDIO PIN10 : DA_LRCK (IC801 PIN60 LRSY) OUTPUT check PIN11 : DA_BCK (IC801 PIN59 DATACLK) PIN12 : DA_DATA0 (IC801 PIN58 DATA) Copyright © 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 51 22 : CLOSE) Check voltage change LO+, LO- OF IC803 Defective IC803 (PN805 PIN23 : OPEN, PIN22 : CLOSE) Defective mechanism LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 52 18 : FSEQ, 26 : WRQ) PIN3 DI : From DSP to micom PIN15 DO : From micom to DSP Check the waveform #1 Defective IC804 Copyright © 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 53 PIN3, 6 (SP+, SP-) IC802 or IC801 Check PN801 Defective pick up or Is reading OK? PIN14, 15 (TA+, TA-) IC802 or IC801 LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 54 #3 focus focus drive coil drive wave wave Defective IC802 Check PN801 connector line Defective PN801 connector Defective pick up focus actuator Copyright © 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 55 Defective IC801 laser control voltage check Defective Q801 or D801 Check PN801 connector line Defective PN801 connector Defective pick up laser part LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 56 #4 spindle spindle drive motor drive wave wave Defective IC802 Check PN802 connector line Defective PN802 connector Defective pick up spindle motor Copyright © 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 57 Does FE, TE signal appear? (IC801 Defective pick up or IC801 PIN10 : RFMON, PIN16 : TE) waveform #6 * REMON is FE LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 58: Usb Part Troubleshooting

    STCK : IC805 PIN52, IC801 PIN55 OUTPUT check STREQ : IC805 PIN53, IC801 PIN54 STDATA : IC805 PIN54, IC801 PIN56 Connector check (CN806) Copyright © 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 59: Waveforms Of Major Check Point

    (PN805 PIN4, 1, 18) during normal play PIN4 : CL PIN4 : CL PIN1 : CE PIN1 : CE PIN18 : FSEQ PIN18 : FSEQ LGE Internal Use Only 4-10 Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 60 There is disc on tray and focus search success disc on tray PIN25 : FAO PIN25 : FAO PIN16 : FA+ PIN16 : FA+ Copyright © 2009 LG Electronics. Inc. All right reserved. 4-11 LGE Internal Use Only Only for training and service purposes...
  • Page 61 #6.RF, FOCUS AND TRACKING ERROR WAVEFORM (IC801 PIN2, 10, 16) during normal play PIN2 : RFOUT PIN 16 : TE PIN10 : RFMON(FE) LGE Internal Use Only 4-12 Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 62: Schematic Diagrams

    SCHEMATIC DIAGRAMS 1. CD SCHEMATIC DIAGRAM 4-13 4-14 Copyright © 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 63: Usb Schematic Diagram

    2. USB SCHEMATIC DIAGRAM 4-15 4-16 LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 64: Printed Circuit Board Diagram

    PRINTED CIRCUIT BOARD DIAGRAM CD P.C.BOARD (TOP VIEW) (BOTTOM VIEW) 4-17 4-18 Copyright © 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 65 MEMO MEMO 4-19 4-20 LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes...

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