LG HT503TH Service Manual
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LG HT503TH Service Manual

Dvd/cd receiver
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Internal Use Only
Website http://biz.lgservice.com
DVD/CD RECEIVER
SERVICE MANUAL
MODEL: HT503TH
P/NO : AFN33723396
FEBRUARY, 2008
(HT503TH-AH,SH53TH-S/C/W)

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Vincent
February 26, 2025

My LG DVD HT503TH NO SOUND

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1 comments:
Mr. Anderson
February 26, 2025

There may be several reasons why there is no sound from your LG DVD HT503TH:

1. Incorrect Input Mode – Ensure the connected equipment is set to the correct input mode to receive the DVD signal.
2. Loose or Disconnected Audio Cables – Check that all audio cables are securely connected to both the speakers and the receiver.
3. Damaged Audio Cables – Replace the audio cables if they appear to be damaged.

Follow these steps to troubleshoot and restore sound.

This answer is automatically generated

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Summary of Contents for LG HT503TH

  • Page 1 Internal Use Only Website http://biz.lgservice.com DVD/CD RECEIVER SERVICE MANUAL MODEL: HT503TH P/NO : AFN33723396 FEBRUARY, 2008 (HT503TH-AH,SH53TH-S/C/W)

  • 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: Service Information For Eeprom

    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

    270 x 1103x 270 mm 331 x 111 x 96 mm 170 x 400 x 382 mm Net Weight 3.6 kg 1.2 kg 5.7 kg 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 IC101 Pin9,36,59 are Check 5V line. 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 2) Tray close waveform 1) Tray open/close waveform OPENSW( OPENSW CLOSESW CLOSESW OPEN OPEN CLOSE CLOSE FIG 3-2 FIG 3-1 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 (DVD) FIG 7-3 (DVD) 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 2-25 2-26 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 2-27 2-28 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 NOTE) With respect to risk of fire or 2008.01.21 NOTE) electricial shock. 2-29 2-30 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 35 2008.02.12 NOTE) Parts that are shaded are critical NOTE) With respect to risk of fire or NOTE) electricial shock. 2-31 2-32 LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 36 3. MPEG CIRCUIT DIAGRAM 2008.01.21 2-33 2-34 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 2008.01.21 2-35 2-36 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 2008.01.21 2-37 2-38 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 39 6. SERVO CIRCUIT DIAGRAM 2008.01.21 2-39 2-40 LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 40 7. AMP CIRCUIT DIAGRAM 2008.02.12 2-41 2-42 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 41 8. DSP CIRCUIT DIAGRAM 2008.02.12 2-43 2-44 LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 42 9. MICOM CIRCUIT DIAGRAM 2008.02.12 2-45 2-46 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 43 10. HDMI IN & OUT(OPTION) CIRCUIT DIAGRAM_1 HDMI IN&OUT HT903/HT503 EBY 40235601 #01 2008.01.21 2-47 2-48 LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 44 11. HDMI IN & OUT(OPTION) CIRCUIT DIAGRAM_2 HDMI IN&OUT HT903/HT503 EBY40235601 #02 2008.01.21 2-49 2-50 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 45 12. HDMI IN & OUT(OPTION) CIRCUIT DIAGRAM_3 HDMI IN&OUT HT903/HT503 EBY40235601 #03 2008.01.21 2-51 2-52 LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 46 13. HDMI OUT ONLY(OPTION) CIRCUIT DIAGRAM_1 HDMI OUT HT903/HT503 EBY 41375101 #01 2008.01.21 2-53 2-54 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 47 14. HDMI OUT ONLY(OPTION) CIRCUIT DIAGRAM_2 HDMI OUT HT903/HT503 EBY41375101 #02 2008.01.21 2-55 2-56 LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 48 15. FRONT KEY & TIMER CIRCUIT DIAGRAM PWR KEY HT903/HT503 EBY40087901 TIMER HT903/HT503 EBY40087801 2008.01.21 2-57 2-58 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 49 16. MIC & USB & PTB CIRCUIT DIAGRAM 2008.02.12 2-60 2-61 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 2-62 2-63 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 ) 2-64 2-65 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 ) 2-66 2-67 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 ) 2-68 2-69 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 ) 2-70 2-71 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. 2-73 2-74 LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 56 5-1. HDMI OUT ONLY P.C. BOARD DIAGRAM ( TOP VIEW ) 5-2. HDMI OUT ONLY P.C. BOARD DIAGRAM ( BOTTOM VIEW ) 2-75 2-76 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 57 6. FRONT TIMER P.C. BOARD DIAGRAM 7. FRONT KEY P.C. BOARD DIAGRAM 8. FRONT JACK P.C. BOARD DIAGRAM 2-77 2-78 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 THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE LITERATURE. OPTIONAL PART 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

    PORTABLE IN CABLE 824 AM LOOP ANTENNA RCA CABLE VIDEO(1WAY) 825 FM WIRE ANTENNA BATTERY OWNER'S MANUAL REMOTE CONTROL PACKING, CASING PACKING, CASING 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(SH53TH-C) LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 62 2. FRONT/REAR SPEAKER(SH53TH-S) A80F : FRONT SPK A80R : REAR SPK A80B 853F : FRONT SPK 853R : REAR SPK Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 63 3. PASSIVE SUBWOOFER(SH53TH-W) 951A 951B LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 64: Section 4. Mechanism (Dp-12Av)

    1. DECK MECHANISM EXPLODED VIEW (DP-12AV) ......4-6 Copyright © 2008 LG Electronics. Inc. All right reserved.

  • Page 65: Deck Mechanism Parts Locations

    When reassembling, perform the procedure in reverse order. The “Bottom” on Disassembly column of above Table indicates the part should be disassembled at the Bottom side. LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 66: Deck Mechanism Disassembly

    1) Turn the Plate Clamp to counterclockwise direction and then lift up the Plate Clamp. 1-1-2. Magnet Clamp 1-1-3. Clamp Upper Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 67: Base Assembly Sled

    1) Release the Scerw(S3) 1) Release 4 Screw(S2). 2) Disconnect the FFC Connector(C1) 4. Rubber Rear (Fig. 4-3) 3-1. Gear Feed 3-2. Gear Middle LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 68: Frame Assembly Up/Down

    11. Base Main(Fig. 4-4) 1) Unlock the Locking Tab(L4) in direction of arrow(B) and then separate the Gear Pulley from the Base Main. Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 69: 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...

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