LG DP372 Service Manual
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LG DP372 Service Manual

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Internal Use Only
Website http://biz.lgservice.com
PORTABLE DVD
SERVICE MANUAL
MODEL: DP372/DP372B-N
CAUTION
BEFORE SERVICING THE UNIT, READ THE "SAFETY PRECAUTIONS"
IN THIS MANUAL.
P/NO : AFN56903618
MARCH , 2008

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  • Page 1 Internal Use Only Website http://biz.lgservice.com PORTABLE DVD SERVICE MANUAL MODEL: DP372/DP372B-N CAUTION BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS” IN THIS MANUAL. P/NO : AFN56903618 MARCH , 2008...
  • Page 2 CONTENTS SECTION 1..SUMMARY SECTION 2..EXPLODED VIEWS SECTION 3..ELECTRICAL SECTION 4..REPLACEMENT PARTS LIST Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 3: Table Of Contents

    PRODUCT SAFETY SERVICING GUIDELINES FOR PORTABLE DVD PRODUCTS ..1-3 SERVICING PRECAUTIONS ........................1-4 • GENERAL SERVICING PRECAUTIONS • INSULATION CHECKING PRODEDURE • ELECTROSTATICALLY SENSITIVE (ES) DEVICES SPECIFICATIONS ............................1-5 LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 4: Product Safety Servicing Guidelines For Portable Dvd Products

    When servicing this product, under no circumstances should the original design be modified or altered without permission from LG Corporation. All components should be replaced only with types identical to those in the original circuit and their physical location, wiring and lead dress must conform to original layout upon completion of repairs.

  • Page 5: Servicing Precautions

    Input terminals, Earphone jacks,etc. tricity sufficient to damage an ES device.) LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 6: Specifications

    480 x 234 (WQVGA) • SUPPLIED ACCESSORIES RCA Video/Audio cable AC Adapter (MPA-630) Automotive Adapter (DPDC1) Remote Control Battery for Remote Control (Lithium Battery) Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 7 MEMO LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 8: Exploded Views

    SECTION 2 EXPLODED VIEWS CONTENTS EXPLODED VIEWS .............................2-2 1. CABINET AND MAIN FRAME SECTION ....................2-2 2. PACKING ACCESSORY SECTION......................2-3 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 9: Cabinet And Main Frame Section

    EXPLODED VIEWS 1. CABINET AND MAIN FRAME SECTION LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 10: Packing Accessory Section

    835 CAR-MOUNT PLUG ASS'Y(RCA CABLE) 801 OWNER'S MANUAL BATTERY 804 PACKING SHEET ADAPTER 803 BAG REMOTE CONTROL 802A 802B MASTER BOX Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 11 MEMO LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 12 PRINTED CIRCUIT BOARD DIAGRAMS ..................3-49 1. MAIN P.C.BOARD ..........................3-49 2. LCD P.C.BOARD ..........................3-53 3. INVERTER P.C.BOARD ........................3-53 4. KEY P.C.BOARD ..........................3-53 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 13: Electrical Troubleshooting Guide

    5VA section BAT_OUT=12V? Replace working? Check Q408/D401 Check Q410/D402 VCC_5V section and Replace and Replace working? Check Q402/Q415 Replace U401 and Replace LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 14: System Operation Flow

    2. System operation routine loop 1. Stop playback & open Tray 2. Display tray open message & LOGO Receive CLOSE Key? Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 15: System Test Flow

    3. Check FLASH R/W enable signal PRD, Update FLASH successfully? RWR. 4. Check RS232 SIGNALS. 5. Check FLASH Memory related circuit. LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 16 Check the Tray control FAN_TRAY+ & FAN_TRAY- amplifying circuit on Motor driver. signal? Check the cable connection between main PCBA and loader. Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 17 Proper Check the amp circuit FCS+ & FCS on motor driver. outputs? Check cable connect on with pick-up head. LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 18 Check the spindle control & FAN_SPN output amp circuit of motor driver properly? Check the cable connection between spindle and main PCBA. Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 19 TRK+ & TRK- amp circuit on motor driver output properly? Check cable connection on pick-up head. Check RF signal waveform. Disc is play? LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 20 IR.VFD front panel key & lines on 1389DE/LP. key functions? 1389DE/LP is normally? Check the cable TEST END connection on front panel. Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 21: Details And Waveforms On System Test And Debugging

    C236 C236 + CE208 + CE208 0.1uF 0.1uF 100uF/6.3V 100uF/6.3V + CE209 + CE209 100uF/6.3V 100uF/6.3V R230 R230 FIG 1-2 LGE Internal Use Only 3-10 Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 22 R314 R314 SD33 R307 10K R307 10K R313 R313 AT26DF161A/AT26DF321 AT26DF161A/AT26DF321 16Mb/32Mb SF_CS R310 R310 SD33 R311 R311 FIG 1-4 Copyright © 2008 LG Electronics. Inc. All right reserved. 3-11 LGE Internal Use Only Only for training and service purposes...

  • Page 23: Sdram Clock

    SW212 SW212 SW202 SW202 SW201 SW201 OPEN C234 C234 TRIN 0.1uF 0.1uF R218 R218 CLOSE DV33 L211 L211 FIG 3-1 LGE Internal Use Only 3-12 Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 24: Sled Control Related Signal

    VINTK R434 R434 FMSO MGND VINSP VOSL+ VOSP- VOSL- VOSP+ MGND MGND VOTK+ VOTK- TRSO FIG 4-2 < CD > Copyright © 2008 LG Electronics. Inc. All right reserved. 3-13 LGE Internal Use Only Only for training and service purposes...

  • Page 25: Laser Power Control Related Signal

    VINFC VCC2 DMSO R432 R432 VINSL+ VINTK MGND VINSP VOSL+ VOSP- DMSO(1.65V/0.3V) VOSL- VOSP+ MGND MGND VOTK+ VOTK- FIG 6-1 LGE Internal Use Only 3-14 Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 26: Focus On Waveform

    VCC1 FOSO R433 R433 VINFC DMSO R432 R432 VINSL+ MGND VOSL+ VOSL- MGND VOTK+ FOSO FIG 7-2 < CD > Copyright © 2008 LG Electronics. Inc. All right reserved. 3-15 LGE Internal Use Only Only for training and service purposes...

  • Page 27: Tracking Control Related Signal(System Checking)

    VINSP 22 MGND VOSP- 21 VOSL+ VOSP+ 20 VOSL- MGND 19 MGND VOTK- 18 VOTK+ TRSO FIG 8-2 < CD > LGE Internal Use Only 3-16 Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 28: De/Lp Video Output Waveform

    C522 PJ-3513B-3531 PJ-3513B-3531 ESD(15pF/56P) ESD(15pF/56P) J510 J510 R524 R524 A+5V C504 C504 56pF-102(EMC) 56pF-102(EMC) C526 C526 56pF-102(EMC) 56pF-102(EMC) FIG 10-1 Copyright © 2008 LG Electronics. Inc. All right reserved. 3-17 LGE Internal Use Only Only for training and service purposes...

  • Page 29: Wiring Connection Diagrams

    WIRING CONNECTION DIAGRAMS 1. WIRING CONNECTION DIAGRAM-1 (MAIN PCB <---> LCD & INVERTOR PCB) INVERTOR PCB LCD PCB MAIN PCB LGE Internal Use Only 3-18 Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 30: Wiring Connection Diagram-2

    2. WIRING CONNECTION DIAGRAM-2 (MAIN PCB <---> KEY PCB) key P y PCB MAIN PCB Copyright © 2008 LG Electronics. Inc. All right reserved. 3-19 LGE Internal Use Only Only for training and service purposes...

  • Page 31: Block Diagrams

    BLOCK DIAGRAMS 1. OVERALL BLOCK DIAGRAM LGE Internal Use Only 3-20 Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 32: Power Block Diagram

    2. POWER BLOCK DIAGRAM Copyright © 2008 LG Electronics. Inc. All right reserved. 3-21 LGE Internal Use Only Only for training and service purposes...

  • Page 33: Servo Block Diagram

    3. SERVO BLOCK DIAGRAM LGE Internal Use Only 3-22 Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 34: System Block Diagram

    4. SYSTEM BLOCK DIAGRAM Copyright © 2008 LG Electronics. Inc. All right reserved. 3-23 LGE Internal Use Only Only for training and service purposes...

  • Page 35: Av Block Diagram

    5. AV BLOCK DIAGRAM LGE Internal Use Only 3-24 Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 36: Lcd Block Diagram

    6. LCD BLOCK DIAGRAM Copyright © 2008 LG Electronics. Inc. All right reserved. 3-25 LGE Internal Use Only Only for training and service purposes...
  • Page 37 MEMO LGE Internal Use Only 3-26 Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 38: Circuit Diagrams

    DVD_KEY4 DVD_KEY4 DVD_KEY5 DVD_KEY5 02.MPEG 02.MPEG 02.MPEG Saturday, November 17, 2007 Saturday, November 17, 2007 Saturday, November 17, 2007 3-27 3-28 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 39: Memory Circuit Diagram

    LG & MALATA LG & MALATA 03.MEMORY 03.MEMORY 03.MEMORY Saturday, November 17, 2007 Saturday, November 17, 2007 Saturday, November 17, 2007 3-29 3-30 LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 40: Opu & Motor Circuit Diagram

    LIMIT Q414 Q414 Saturday, November 17, 2007 Saturday, November 17, 2007 Saturday, November 17, 2007 4x1 W/HOUSING 4x1 W/HOUSING 3-31 3-32 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 41: Av Circuit Diagram

    MR_OUT MR_OUT ML_OUT 05.AV 05.AV 05.AV ML_OUT Tuesday, November 20, 2007 Tuesday, November 20, 2007 Tuesday, November 20, 2007 3-33 3-34 LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 42: Charge Circuit Diagram

    LG & MALATA TP616 TP616 06.CHARGE 06.CHARGE 06.CHARGE Saturday, November 17, 2007 Saturday, November 17, 2007 Saturday, November 17, 2007 3-35 3-36 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 43: Lcd If Circuit Diagram

    C707 07.LCD I/F 07.LCD I/F 07.LCD I/F Saturday, November 17, 2007 Saturday, November 17, 2007 Saturday, November 17, 2007 3-37 3-38 LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 44: Audio Circuit Diagram

    SMBT3906 C810 C810 H:FM L:FM C811 C811 Saturday, November 17, 2007 Saturday, November 17, 2007 Saturday, November 17, 2007 3-39 3-40 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 45: Key Circuit Diagram

    1.Ref 100/75 100/75 100pF 100pF 2.Anode 3.Cathode Monday, October 15, 2007 Monday, October 15, 2007 Monday, October 15, 2007 3-41 3-42 LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 46: Lcd Key Circuit Diagram

    C808 R808 R808 15K 1% 15K 1% SLEEP K813 K813 RI-01CS0BM RI-01CS0BM R809 R809 39K 1% 39K 1% KEY_GND 3-43 3-44 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 47: Circuit Voltage Chart

    1.29 1.28 4.52 4.50 3.33 3.33 2.92 2.92 2.94 1.26 1.27 4.52 4.50 0.50 0.98 3.30 0.24 1.14 1.13 3-45 3-46 LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 48 3.39 3.38 Collector Q501 CE512 Base 0.70 0.70 Emitter 5.55 5.50 CE411 Q201 Collector 9.80 9.71 Emitter CE513 Base 3-47 3-48 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 49: Printed Circuit Board Diagrams

    PRINTED CIRCUIT BOARD DIAGRAMS 1. MAIN P.C.BOARD (TOP VIEW) 3-49 3-50 LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 50 MAIN P.C.BOARD (BOTTOM VIEW) 3-51 3-52 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 51: Lcd P.c.board

    2. LCD P.C.BOARD (TOP VIEW) (BOTTOM VIEW) 3. INVERTER P.C.BOARD (TOP VIEW) (BOTTOM VIEW) 4. KEY P.C.BOARD (TOP VIEW) (BOTTOM VIEW) 3-53 3-54 LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...

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Dp372b-n

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