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Internal Use Only
Website http://biz.lgservice.com
CAR CD/MP3/WMA
RECEIVER
SERVICE MANUAL
MODEL : LAC6700R
CAUTION
BEFORE SERVICING THE UNIT, READ THE "SAFETY PRECAUTIONS"
IN THIS MANUAL.
P/NO : AFN35097871
OCTOBER, 2007

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Troubleshooting

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   Summary of Contents for LG LAC6700R

  • Page 1

    Internal Use Only Website http://biz.lgservice.com CAR CD/MP3/WMA RECEIVER SERVICE MANUAL MODEL : LAC6700R CAUTION BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS” IN THIS MANUAL. P/NO : AFN35097871 OCTOBER, 2007...

  • Page 2: Table Of Contents

    5. LCD LIGHTING P.C.BOARD...........................2-41 SECTION 3 EXPLODED VIEWS 1. CABINET AND MAIN FRAME SECTION ........................3-1 2. MECHANISM(PICK-UP) SECTION..........................3-3 SECTION 4 REPLACEMENT PARTS LIST .............4-1 Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 3: Section 1 Summary

    Further check the insulation between the blades of attachment plug and accessible conductive parts. LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 4: 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. Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 5: Specifications

    520 ~ 1720 or 522 ~ 1620kHz S/N Ratio 45dB Distortion 1.0% Usable Sensitivity 28dBµV • USB SECTION Version USB 1.1 LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 6: Section 2 Electrical

    11 Not avaliable to Remote Checked the Remote control. (External AMP) IC401(63,64) 12 No output Beep sound. Checked the Beep Control. IC401(80), BU301 Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 7

    : PRE-GND * Keep changed IC, We request that you send it to HQ. : PW-GND Picture 1) Power IC desc. LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 8

    Checked the Tuner Signal out. TU101(8,9), IC601(5,6) Checked the AF mute. TU101(19), IC401(4) Not available to RDS Checked the RDS data. TU101(20,21), IC401(65,83) Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 9: Cd Part Troubleshooting

    CN510(12, 17) Checked the loading IC513(12, 14, 15) motor control? Fig 3, 4 Checked the 8/12cm PN504(1) sens switch? Fig 1, 2 LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 10

    Fig 7 PN504(5, 6) Checked the TRVP control? Fig 13 IC506(24) Checked the tracking control? IC513(19, 20) Fig 6 Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 11

    Fig 8 No ejected the CD? CN901(16) [MAIN] Checked the Eject key? Checked the loading motor D6, D5 control? Fig 3, 4 LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 12: Usb Part Troubleshooting

    Checked the D+/D- port? Fig 14 Checked the USB IC511(27) indication port? Checked the USB IC506 (62, 63, 64) interface IC control? Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 13

    IC511(22, 23) IC510(50, 51) Checked the USB data? USB no sound? Checked the CD DSP IC520(1, 2, 3) signal out? Fig 8 LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 14: Waveforms

    Fig 4) Motor control signal for unloading D6:[REW] SLED CON PIN504:[PIN5] D5:[FEW] PIN504:[PIN6] SLED CON R5091:[SLED CON] R5091:[SLED CON] R5465:[LOAD IN] LOADING IN LOADING IN R5465:[LOAD IN] Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 15

    Fig 9) PD, RFOUT Fig 10) CLK, REQ & DATA PD/MD IC511:[PIN52] IC506:[PD41] IC511:REQ[PIN53] RFOUT IC506:[RFOUT46] IC511:DATA[PIN54] LOADING IN DATA LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. 2-10 Only for training and service purposes...

  • Page 16

    Fig 14) USB D+, D- signal R504:[PIN5] PN503:PIN3 [D-] PN504:[PIN6] PN503:PIN2 [D+] R5091:[SLED CON] UART RX R560:UART RX R5465:[LOAD IN] TRVP R562:UART TX UART TX Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only 2-11 Only for training and service purposes...

  • Page 17: Internal Block Diagram Of Ics

    CDOUT CEXT 10uF ILMOUT 0.1uF CILM 0.1uF AUDIOOUT FREG B CAUDIO 10uF QFREG RFREG3 FREG F CFREG RFREG1 10uF RFREG2 LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. 2-12 Only for training and service purposes...

  • Page 18

    (pin14) output circuits are built-in overcurrent protection circuit based on the respective output current. These overcurrent protection circuits limit the current with a curve shape of “7” in the voltage-current graph. This prevents IC destruction due to overcurrent. Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only 2-13...

  • Page 19: Ic302 (ba00ccowfp)

    PAUX_MUTE(O) PDAC_MUTE(O) PLIGHT(O) PCDP_RST(O) PDIM_OUT(O) PCDP_MLD(O) PEJECT(I) PZERO_MUTE(I) PQUALTY(I) PISP(O) PSMETER(I) PUSB_POWER/PBT_POWER(O ) PLEVEL_METER(I) PKEY2(I) PUSB_SW(I) PKEY1(I) PUSB_RESET(O) AVss EVdd1 LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. 2-14 Only for training and service purposes...

  • Page 20

    Tuner <----> VR IC mute • D/A converter reference voltage input AVREF0 • Positive power supply for P110, P111, and D/A converter Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only 2-15 Only for training and service purposes...

  • Page 21

    Connect to VSS via a capacitor (0.47 to 1µF) Ground EVSS0 Ground Potential for Ports Positive power supply (+5V) 100 EVDD0 Positive power supply (+5V) For Ports LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. 2-16 Only for training and service purposes...

  • Page 22: Ic601 (tda7419)

    DIGITAL CONTROL C BUS C BUS C BUS CREF CREF VREFOUTF VREFOUTF AC2INL/ AC2INL/ AC2INR/ AC2INR/ SE3L SE3L SE3R SE3R Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only 2-17 Only for training and service purposes...

  • Page 23

    Spectrum analyzer output VREF Vref output MIX / OUTSW / OUTRR2 Mix input / Additional subwoofer output / 2 rear right output LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. 2-18 Only for training and service purposes...

  • Page 24: Ic602 (njm2706-dmp24)

    22. LOUT 11. ealaVROUT 23. RIN 12. GND 24. LIN 6-2. BLOCK DIAGRAM Vref 3D FILTER H:eala L:BYPASS H:eala_Bass L:BYPASS Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only 2-19 Only for training and service purposes...

  • Page 25: Ic801 (tb2904hq)

    OUT3 ( ) OUT4 ( ) PW-GND4 OUT4 ( ) PRE-GND OFF-SET STBY MUTE PLAY MUTE : PRE-GND : PW-GND LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. 2-20 Only for training and service purposes...

  • Page 26: Ic901 (ld3811)

    VLCD2 DCRAM ADDRESS INSTRUCTION 48X240 COUNTER VLCD3 VLCD3 REGISTER bits ADDRESS REGISTER TIMING GENERATOR SHIFT REGISTER CLOCK CCB INTERFACE GENERATOR Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only 2-21 Only for training and service purposes...

  • Page 27

    LCD driver block power supply connection. Provide a VLCD voltage of between 4.5 and 10.0 V. Power supply connection. Connect to ground. LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. 2-22 Only for training and service purposes...

  • Page 28: Block Diagram

    BLOCK DIAGRAM Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only 2-23 2-24 Only for training and service purposes...

  • Page 29: Circuit Diagrams

    CIRCUIT DIAGRAMS 1. MAIN CIRCUIT DIAGRAM LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. 2-25 2-26 Only for training and service purposes...

  • Page 30: Cdp 1 Circuit Diagram

    2. CDP 1 CIRCUIT DIAGRAM Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only 2-27 2-28 Only for training and service purposes...

  • Page 31: Cdp 2 Circuit Diagram

    3. CDP 2 CIRCUIT DIAGRAM LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. 2-29 2-30 Only for training and service purposes...

  • Page 32: Front Circuit Diagram

    4. FRONT CIRCUIT DIAGRAM Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only 2-31 2-32 Only for training and service purposes...

  • Page 33: Usb Circuit Diagram

    5. USB CIRCUIT DIAGRAM 6. LCD LIGHTING CIRCUIT DIAGRAM LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. 2-33 2-34 Only for training and service purposes...

  • Page 34: Printed Circuit Diagrams

    PRINTED CIRCUIT BOARD DIAGRAMS 1. MAIN P.C.BOARD (TOP VIEW) Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only 2-35 2-36 Only for training and service purposes...

  • Page 35

    MAIN P.C.BOARD (BOTTOM VIEW) LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. 2-37 2-38 Only for training and service purposes...

  • Page 36: Cdp P.c.board

    2. CDP P.C.BOARD 3. FRONT P.C.BOARD (TOP VIEW) (BOTTOM VIEW) Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only 2-39 2-40 Only for training and service purposes...

  • Page 37: Usb P.c.board

    4. USB P.C.BOARD (TOP VIEW) (BOTTOM VIEW) 5. LCD LIGHTING P.C.BOARD LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. 2-41 2-42 Only for training and service purposes...

  • Page 38: Section 3 Exploded Views

    SECTION 3 EXPLODED VIEWS 1. CABINET AND MAIN FRAME SECTION *Accessory Loc.No. Loc.No. Loc.No. Loc.No. Loc.No. Loc.No. FRONT LCD901 CABLE1 MAIN Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 39: Mechanism(pick-up) Section

    2. MECHANISM(PICK-UP) SECTION LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...

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