LG HT903WA Service Manual
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LG HT903WA Service Manual

LG HT903WA Service Manual

Dvd/cd receiver
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Internal Use Only
Website http://biz.lgservice.com
DVD/CD RECEIVER
SERVICE MANUAL
MODEL: HT903WA
(HT903WA/HT903WA-AP, SH93WA-F/C/L/R/W, W93-T2)
P/NO : AFN55854922
APRIL, 2008

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  • Page 1 Internal Use Only Website http://biz.lgservice.com DVD/CD RECEIVER SERVICE MANUAL MODEL: HT903WA (HT903WA/HT903WA-AP, SH93WA-F/C/L/R/W, W93-T2) P/NO : AFN55854922 APRIL, 2008...

  • Page 2: Table Of Contents

    ....... 5-1 Copyright © 2008 LG Electronics. Inc. All right reserved.

  • Page 3: Section 1. General

    (Do not use any other liquid cleaners, because they will damage the lens.) 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 © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 4 7) The laser beam from the pick-up should NEVER be directly facing the eyes or bare skin. Armband Resistor (1 Mohm) Resistor Conductive (1 Mohm) Sheet Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 5: Esd Precautions

    THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE LITERATURE. LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 6 OPT D make changes OPT E OPT F OPT G Press pause key once Change will be applied when power OFF-->ON. Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 7 FLD ‘write ok’ or ‘up ok’ Remote control ‘2’ + Front ‘STOP’ push same timing FLD display E2P CLR or EP CLR Auto power off LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 8: Program Download Guide

    6. When the power is turned on, the language selection menu is initially displayed. After selecting the desired language, press the SELECT/ENTER. Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 9: Specifications

    DC 7.5V max WIRELESS RECEIVER (REAR SPEAKERS) Power requirements Refer to main label Power consumption Refer to main label Reception Output 2.4 GHz LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 10: Section 2. Electrical Part

    Does initial read work? Check focus circuit. Check disc. Check tracking servo circuit. Does it play? Does it output Check audio circuit. audio? Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 11 *1 : PN206 Pins. PIN1 : -34 VKK, PIN2 : -28 FL+, PIN3 : -32 FL-, PIN12 : +5VA, PIN13 : +5V LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 12 Refer to MICOM circuit. control waveform of PN301 pin11 is ok? Check if RC2 voltage is ok(5V)? Check RM circuit Resolder or Replace RC2. Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 13 2. System operation routine loop. 1. Stop Playback & Open Tray. 2. Display tray open message & LOGO. Receive CLOSE Key? LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 14 2. Check system reset circuit. Update 3. Check FLASH R/W enable signal PRD, FLASH successfully? RWR. 4. Check FLASH Memory related circuit. Replace FLASH. Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 15 Check the Tray control MOTOR LOAD+ & LOAD-signal? & SERVO circuit IC401. Check AV cable connection between main PCBA and loader. (MECHA) LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 16 Check the amp circuit on motor Proper F+ & F- outputs? driver. Check cable connection with pick-up head. Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 17 Check the spindle control amp SPNN output circuit of motor driver. properly? Check the cable connection between spindle and main PCB. LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 18 Check the tracking control amp TR+ & TR-output circuit on motor driver. properly? Check cable connection on pick-up head. Disc Playback? Check RF signal waveform. Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 19 Pins 54, 55, 58, 59, 61, 62, 67, 68, 70, 71, 74, 75). Check Digital Amp circuit TEST END. (IC701, IC702, IC703, IC704). LGE Internal Use Only 2-10 Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 20 Replace the Q703, Q704 and Q705. Is the Q703, Q704 and Q705 normal? Replace TI AMP IC(IC701, IC702, IC703, IC704) Copyright © 2008 LG Electronics. Inc. All right reserved. 2-11 LGE Internal Use Only Only for training and service purposes...
  • Page 21 Check DVD Module. Check 5V line. are high(5V). Check Check power section if IC101 Pin44 Check SMPS. circuit. is high. Replace IC101. LGE Internal Use Only 2-12 Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 22: Details And Waveforms On System Test And Debugging

    1) ES8391 main clock is at 27MHz(X501) FIG 1-1 2) ES8391 reset is high active. IC101 PWR_CTL DVD_RESET MRST# FIG 1-2 IC501 Copyright © 2008 LG Electronics. Inc. All right reserved. 2-13 LGE Internal Use Only Only for training and service purposes...
  • Page 23 1) Tray open/close waveform 2) Tray close waveform OPENSW( OPENSW CLOSESW CLOSESW OPEN OPEN CLOSE CLOSE FIG 3-1 FIG 3-2 LGE Internal Use Only 2-14 Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 24 OPENSW CLOSESW OPEN CLOSE FIG 3-3 4. SLED CONTROL RELATED SIGNAL (NO DISC CONDITION) DRV_MUTE SLED+ IC501 SLED- FIG 4-1 Copyright © 2008 LG Electronics. Inc. All right reserved. 2-15 LGE Internal Use Only Only for training and service purposes...
  • Page 25 5. LENS CONTROL RELATED SIGNAL(NO DISC CONDITION) IC501 FIG 5-1 6. LASER POWER CONTROL RELATED SIGNAL(NO DISC CONDITION) DVD MDI IC501 DVDLDO501 CDLDO FIG 6-1 IC501 LGE Internal Use Only 2-16 Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 26 7. DISC TYPE JUDGEMENT WAVEFORMS CD_DVDCT CD_DVDCT FIG 7-1 (DVD) FIG 7-2 (DVD) CD_DVDCT CD_DVDCT FIG 7-4 (CD) FIG 7-3 (CD) IC501 Copyright © 2008 LG Electronics. Inc. All right reserved. 2-17 LGE Internal Use Only Only for training and service purposes...
  • Page 27 CD_DVDCT IC501 FIG 8-1 (DVD) CD_DVDCT FIG 8-2 (DVD) 9. SPINDLE CONTROL WAVEFORMS (NO DISC CONDITION) SPINO IC501 FIG 9-1 LGE Internal Use Only 2-18 Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 28 10. TRACKING CONTROL RELATED SIGNAL(System checking) CD_DVDCT IC501 FIG 10-1 (DVD) CD_DVDCT IC501 FIG 10-2 (CD) Copyright © 2008 LG Electronics. Inc. All right reserved. 2-19 LGE Internal Use Only Only for training and service purposes...
  • Page 29 11. ES8391 VIDEO OUTPUT WAVEFORMS 1) Full colorbar signal(COMPOSIT) IC501 FIG 11-1 2) Y IC501 FIG 11-2 LGE Internal Use Only 2-20 Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 30 12. AUDIO OUTPUT FROM PWM IC 1) Audio related Signal ADATA0 ASDATA3 LRCK IC501 FIG 12-1 IC501 IC501 Copyright © 2008 LG Electronics. Inc. All right reserved. 2-21 LGE Internal Use Only Only for training and service purposes...
  • Page 31 C+ : TP605 -> R731 W+ : TP607 -> R767 C- : TP606 -> R736 W- : TP608 -> R762 LGE Internal Use Only 2-22 Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 32: Wiring Diagram

    PN103 CN902 CABLE 3 PN204 SMPS PCB PN206 CABLE 5 PN202 USB PCB PN301 FRONT PCB 2008. 01. 26 2-23 2-24 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 33: Overall Block Diagram

    DRIVER SANYO Component SANYO JACK JACK AUDIO AUDIO GR[1-12] SG[1-16] MICOM MICOM SPDIF SPDIF SPDIF OPT IN PORT S/W 2-25 2-26 LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 34: Circuit Diagrams

    NOTE) Parts that are shaded are critical 2008.01.21 NOTE) With respect to risk of fire or NOTE) electricial shock. 2-27 2-28 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 35 Warning NOTE) Parts that are shaded are critical NOTE) With respect to risk of fire or NOTE) electricial shock. 2-29 2-30 LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 36 3. MPEG CIRCUIT DIAGRAM 2008.03.07 2-31 2-32 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 37 4. POWER INTERFACE CIRCUIT DIAGRAM 2008.03.07 2-33 2-34 LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 38 5. I/O CIRCUIT DIAGRAM 2008.03.07 2-35 2-36 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 39 6. SERVO CIRCUIT DIAGRAM 2008.03.07 2-37 2-38 LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 40 7. AMP CIRCUIT DIAGRAM 2008.03.11 2-39 2-40 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 41 8. DSP CIRCUIT DIAGRAM 2008.03.11 2-41 2-42 LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 42 9. MICOM CIRCUIT DIAGRAM 2008.03.11 2-43 2-44 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 43 10-1. HDMI IN & OUT CIRCUIT DIAGRAM (OPTIONAL PART) HDMI IN&OUT HT903/503 EBY40235601(#1) 2008.03.07 2-45 2-46 LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 44 10-2. HDMI IN & OUT CIRCUIT DIAGRAM (OPTIONAL PART) HDMI IN&OUT HT903/503 EBY40235601(#2) 2008.03.07 2-47 2-48 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 45 10-3. HDMI IN & OUT CIRCUIT DIAGRAM (OPTIONAL PART) HDMI IN&OUT(IPOD Part) HT903/503 EBY40235601(#3) 2008.03.07 2-49 2-50 LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 46 11-1. HDMI OUT ONLY CIRCUIT DIAGRAM (OPTIONAL PART) 2008.03.26 2-51 2-52 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 47 11-2. HDMI OUT ONLY CIRCUIT DIAGRAM (OPTIONAL PART) 2-53 2-54 LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 48 12. FRONT KEY & TIMER CIRCUIT DIAGRAM PWR KEY HT903/HT503 EBY40087901 TIMER HT903/HT503 EBY40087801 2008.01.21 2-55 2-56 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 49 13. MIC & USB & PTB CIRCUIT DIAGRAM 2008.02.12 2-57 2-58 LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 50: Circuit Voltage Chart

    Voltage Names Pin Numbers Voltage VCC50 4.87 V 12V_INPUT 12.04 V MVCC50 5, 19 4.86 V COREVCC1.5 1.56 V 2-59 2-60 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 51 PRINTED CIRCUIT BOARD DIAGRAMS 1-1. MAIN P.C. BOARD DIAGRAM ( TOP VIEW ) 2-61 2-62 LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 52 1-2. MAIN P.C. BOARD DIAGRAM ( BOTTOM VIEW ) 2-63 2-64 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 53 2-1. AMP P.C. BOARD DIAGRAM ( TOP VIEW ) 2-65 2-66 LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 54 2-2. AMP P.C. BOARD DIAGRAM ( BOTTOM VIEW ) 2-67 2-68 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 55 Parts that are shaded are critical With respect to risk of fire or electrical shock. respect to risk of fire or electrical shock. 2-69 2-70 LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 56 ( TOP VIEW ) ( BOTTOM VIEW ) 4-2. HDMI OUT ONLY ( TOP VIEW ) ( BOTTOM VIEW ) 2-71 2-72 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 57 5. FRONT TIMER P.C. BOARD DIAGRAM 6. FRONT KEY P.C. BOARD DIAGRAM 7. FRONT JACK P.C. BOARD DIAGRAM 2-73 2-74 LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 58: Section 3. Exploded Views

    TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE LITERATURE. PN302 HDMI CABLE3 CABLE4 CABLE5 CABLE2 CABLE1 TU101 PN206 CN902 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 59: Deck Mechanism Exploded View(Dp-12Av)

    • DECK MECHANISM EXPLODED VIEW(DP-12AV) 015B 015A 012A LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 60: Packing Accessory Section

    PACKING, CASING PACKING, CASING SPEAKER CABLE WIRE80 RED 4M (F.R) WIRE81 WHITE 4M (F.L) WIRE70 GREEN 4M (CENTER) WIRE90 ORANGE 4M (WOOFER) Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 61: Speaker Section

    • SPEAKER SECTION 1. CENTER SPEAKER(SH93WA-C) WIRE70 : GREEN LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 62 2. FRONT SPEAKER(SH93WA-F) A80A A80B WIRE80 : RED(F.R) WIRE81 : WHITE(F.L) Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 63 LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 64 A82 : Rear Right A80C 854R 871L : RX-L ch A80B 871R : RX-R ch A80L : RX-L ch A80R : RX-R ch Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 65 LGE Internal Use Only 3-10 Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 66 4. PASSIVE SUBWOOFER(SH93WA-W) 955B 951A 951B 951C 955A WIRE90 : ORANGE Copyright © 2008 LG Electronics. Inc. All right reserved. 3-11 LGE Internal Use Only Only for training and service purposes...
  • Page 67 5. WIRELESS TRANSMITTER(W93-T2) A300 381L A80S 381R A80M * ACCESSORY SOUND SIGNAL cable DC power cable LGE Internal Use Only 3-12 Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 68: Section 4. Mechanism (Dp-12Av)

    SECTION 4. MECHANISM (DP-12AV) [CONTENTS] DECK MECHANISM PARTS LOCATIONS • Top View ............4-2 •...

  • Page 69: Deck Mechanism Parts Locations

    DECK MECHANISM PARTS LOCATIONS • Top View Procedure Disass Fig- Parts Fixing Type embly Starting No. Main Base Clamp Assembly Disc 1, 2 Plate Clamp 1, 2, 3 Magnet Clamp 1, 2, 3, 4 Clamp Upper Tray Disc 1, 6 Base Assembly Sled 4 Screws, 1, 2, 6...

  • Page 70: Deck Mechanism Disassembly

    DECK MECHANISM DISASSEMBLY TRAY DISC MAIN BASE DISC CLAMP ASSEMBLY PLATE CLAMP MAGNET CLAMP CLAMP UPPER (Fig. A) BASE MAIN HOLDER LEVER BASE MAIN BASE MAIN BOTTOM SIDE VIEW Fig. 4-1 Fig. 4-2 1. Main Base (Fig. 4-1) 2. Tray Disc (Fig. 4-2) 1-1.

  • Page 71: Base Assembly Sled

    RUBBER DAMPER Distinguish upper and lower sides (Assemble with care) RUBBER DAMPER Distinguish upper and lower sides RUBBER DAMPER (Assemble with care) BASE PU (S2) (S2) RUBBER DAMPER GENERAL PICK UP ASSEMBLY GEAR RACK SPINDLE MOTOR ASSEMBLY Fig. 4-3 3. Base Assembly Sled (Fig. 4-3) 3-3.

  • Page 72: Frame Assembly Up/Down

    GUIDE UP/DOWN GEAR LOADING GEAR PULLEY (L6) SCREW INSERTION (L6) TORGUE CONTROL BASE MAIN (L4) BELT LOADING (H1) (C2) PWB ASSEMBLY LOADING (S5) (S4) BASE MAIN (S4) UP/DOWN FRAME ASSEMBLY (L5) GUIDE UP/DOWN FIG. (A) FIG. (B) GUIDE UP/DOWN GUIDE UP/DOWN FIG.

  • Page 73: Deck Mechanism Exploded View(Dp-12Av)

    • DECK MECHANISM EXPLODED VIEW(DP-12AV) 015B 015A 012A...

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