LG LAC4710R Service Manual
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LG LAC4710R Service Manual

Car cd/mp3/wma receiver
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Internal Use Only
Website http://biz.lgservice.com
CAR CD/MP3/WMA
RECEIVER
SERVICE MANUAL
MODEL : LAC4710R
CAUTION
BEFORE SERVICING THE UNIT, READ THE "SAFETY PRECAUTIONS"
IN THIS MANUAL.
P/NO : AFN35097886
OCTOBER, 2007

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  • Page 1 Internal Use Only Website http://biz.lgservice.com CAR CD/MP3/WMA RECEIVER SERVICE MANUAL MODEL : LAC4710R CAUTION BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS” IN THIS MANUAL. P/NO : AFN35097886 OCTOBER, 2007...

  • Page 2: Table Of Contents

    5. LCD LIGHTING P.C.BOARD...........................2-35 SECTION 3 EXPLODED VIEWS 1. CABINET AND MAIN FRAME SECTION ........................3-1 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

    • AUX SECTION Frequency Response 20Hz ~ 20kHz S/N Ratio 80dB Distortion 0.1% Channel Separation (1kHz) 45dB Max Input Level (1kHz) 1.1V (35KΩ) LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 6: Section 2 Electrical

    Checked the Remote control. CN801(6), IC402(1,2,4), Q308, Q309 (External AMP) IC401(63,64) 12 No output Beep sound. Checked the Beep Control. IC401(80) 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(6,7) 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

    CN509(12, 17) Checked the loading IC513(12, 14, 15) motor control? Fig 3, 4 Checked the 8/12cm CN509(10) 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 Checked the Eject key? Checked the loading motor D6, D5 control? Fig 3, 4 CD no sound? Checked the DSP IC506(56, 59) signal out? LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 12: Waveforms

    Fig 4) Motor control signal for unloading D6:[REW] SLED CON IC504:[PIN13] D5:[FEW] IC504:[PIN14] 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 13 PLLF IC506:PLLF:[PIN54] IC504:SP+[PIN11] IC506:PD[41] RFOUT IC504:SP-[PIN12] IC506:RFOUT[46] IC506:SPOUT[PIN21] SPOUT LOADING IN Fig 9) CLK, REQ & DATA IC506:CLK[PIN52] IC506:REQ[PIN53] IC506:DATA[PIN54] DATA LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 14 IC506:STAT STAT [PIN71] [PIN71] IC506:MDATA IC506:MDATA [PIN48] [PIN48] MDATA MDATA Fig 12) SLED control IC504:[PIN13] IC504:[PIN14] R5091:[SLED CON] R5465:[LOAD IN] TRVP Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 15: 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. 2-10 Only for training and service purposes...
  • Page 16 (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 2-11...

  • Page 17: 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. 2-12 Only for training and service purposes...
  • Page 18 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 2-13 Only for training and service purposes...
  • Page 19 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. 2-14 Only for training and service purposes...

  • Page 20: Ic601 (Bd3805F)

    Mute Mute Input Selector (4 stereo include 1 isolation input) 50k 50k VCC/2 100k 100k 100k 100k 100k 100k AGND Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only 2-15 Only for training and service purposes...

  • Page 21: 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. 2-16 Only for training and service purposes...

  • Page 22: Ic901 (Pt6523)

    SG30 SG52 SG29 SG28 COM1 COM2 SG27 COM3 SG26 SG25 SG24 SG23 VDD1 VDD2 SG22 SG21 SG20 SG19 SG18 SG17 Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only 2-17 Only for training and service purposes...
  • Page 23 MEMO LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. 2-18 Only for training and service purposes...

  • Page 24: Block Diagram

    BLOCK DIAGRAM Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only 2-19 2-20 Only for training and service purposes...

  • Page 25: Circuit Diagrams

    CIRCUIT DIAGRAMS 1. MAIN CIRCUIT DIAGRAM LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. 2-21 2-22 Only for training and service purposes...

  • Page 26: Cdp Circuit Diagram

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

  • Page 27: Front Circuit Diagram

    3. FRONT 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 28: Aux Circuit Diagram

    4. AUX CIRCUIT DIAGRAM 5. LCD LIGHTING 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 29: Printed Circuit Diagrams

    PRINTED CIRCUIT DIAGRAMS 1. MAIN P.C.BOARD (TOP VIEW) LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. 2-29 2-30 Only for training and service purposes...
  • Page 30 MAIN P.C.BOARD (BOTTOM VIEW) Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only 2-31 2-32 Only for training and service purposes...

  • Page 31: Cdp P.c.board

    2. CDP P.C.BOARD 3. FRONT P.C.BOARD (TOP VIEW) (BOTTOM VIEW) LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. 2-33 2-34 Only for training and service purposes...

  • Page 32: Aux P.c.board

    MEMO 4. AUX P.C.BOARD 5. LCD LIGHTING P.C.BOARD Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only 2-35 2-36 Only for training and service purposes...

  • Page 33: 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. LCD1 CABLE1 MAIN LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...

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