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LG HT552TH Service Manual
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LG HT552TH Service Manual

Dvd/cd receiver
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See also: Owner's Manual
P/NO : AFN31640733
DVD/CD RECEIVER

SERVICE MANUAL

MODEL : HT552TH
DECEMBER, 2006
http://biz.lgservice.com
SH52TH-C, SH52TH-S,
SH52TH-W

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Summary of Contents for LG HT552TH

  • Page 1: Service Manual

    DVD/CD RECEIVER SERVICE MANUAL MODEL : HT552TH SH52TH-C, SH52TH-S, SH52TH-W P/NO : AFN31640733 DECEMBER, 2006...

  • Page 2: Table Of Contents

    [CONTENTS] SECTION 1. GENERAL • SERVICING PRECAUTIONS ..........1-2 •...

  • Page 3: Servicing Precautions

    SECTION 1. GENERAL SERVICING PRECAUTIONS NOTES REGARDING HANDLING OF THE PICK-UP 1. Notes for transport and storage 1) The pick-up should always be left in its conductive bag until immediately prior to use. 2) The pick-up should never be subjected to external pressure or impact. Storage in conductive bag Drop impact 2.
  • Page 4 NOTES REGARDING COMPACT DISC PLAYER REPAIRS 1. Preparations 1) Compact disc players incorporate a great many ICs as well as the pick-up (laser diode). These components are sensitive to, and easily affected by, static electricity. If such static electricity is high voltage, components can be damaged, and for that reason components should be handled with care.

  • Page 5: Esd Precautions

    ESD PRECAUTIONS Electrostatically Sensitive Devices (ESD) Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called Electrostatically Sensitive Devices (ESD). Examples of typical ESD devices are integrated circuits and some field-effect transistors and semiconductor chip components. The following techniques should be used to help reduce the incidence of component damage caused by static electricity.

  • Page 6: Table Of Contents

    SERVICE INFORMATION FOR EEPROM(DVD PART) POWER ON *Refer to page 6-1. DETECT NEW EEPROM DVD LOGO Status (NO Disk status) (OPTION EDIT SCREEN) NAME Remotecontrol OPT 1 Pause key-->1-->4-->7-->2 in order. OPT 2 OPT 3 OPT 4 OPT 5 OPT 6 Press number 0~9, Press charater OPT 7 A~F (1~6 for a while)
  • Page 7 SERVICE INFORMATION FOR EEPROM (AMP PART) POWER ON FLD no disc status Remotecontrol ‘2’ + Front ‘STOP’ push same timing during 5s DETECT NEW EEPROM (OPTION EDIT SCREEN) NAME FLD ‘00…. Use arrow key ( ) move to appropriate position and make changes Press ENTER key once FLD ‘write ok’...

  • Page 8: Specifications

    SPECIFICATIONS GENERAL Power supply Refer to main label. Power consumption Refer to main label. Net Weight 3.6 kg External dimensions (W x H x D) 430 x 70 x 311 mm Operating conditions Temperature: 5°C to 35°C, Operation status: Horizontal Operating humidity 5% to 85% Laser...

  • Page 9: Audio Troubleshooting Guide

    SECTION 2. AUDIO PART AUDIO TROUBLESHOOTING GUIDE 1. POWER SUPPLY CIRCUIT Insert power cord Does red power led turn on? Check power plug and power supply circuit. Turn power on. Is power on? Check power supply circuit. Does initial read work? Check laser circuit.
  • Page 10 2. FRONT CIRCUIT (1/2) Power on. Reconnect it. Tuner off the red led? Check if the PN301 is ok? (Refer to notice *1) Check if the front Is digitron on normally? Refer to smps part. power is ok?(*2) Check if all buttons are ok? Check if the remotecontrol is ok?
  • Page 11 3. FRONT CIRCUIT (2/2) Check if the power part of the front is ok? Reffer to power(SMPS). Check if R345~R350, R150 ok? Replack R345 ~ R350, R154. Refer to micom circuit. Check if the power part of the front is ok? Reffer to power(SMPS).

  • Page 12: Wiring Diagram

    WIRING DIAGRAM CABLE4 EAD35201302 HDMI SCART JACK AV JACK SPEAKER TERMINAL JACK COMPONENT S/W OPTICAL IN AMP PCB MAIN PCB HEAT SINK 561-711O PN206 6630XE00118 6630XE00123 PN103 P4401 CABLE3 EAD35201502 23PIN 14PIN EAD35214501 15PIN EAD35219501 SMPS PCB 9PIN PN204 6630XE00111 CABLE2 EAD35632101 11PIN CABLE1 EAD35201101...

  • Page 13: Block Diagram

    BLOCK DIAGRAM IC508 TAS5152 IC601 TAS5152 TAS5152 TAS5152 IC501 IC204 IC203 AK5358 NJM4580 OPAMP IP9009A...
  • Page 14 MODIFIED OR ALTERED WITHOUT PERMISSION IMPLEMENTATION OF THE LATEST SAFETY AND during Play mode. FROM THE LG CORPORATION. ALL COMPONENTS PERFORMANCE IMPROVEMENT CHANGES INTO SHOULD BE REPLACED ONLY WITH TYPES IDENTI- THE SET IS NOT DELAYED UNTIL THE NEW SERVICE CAL TO THOSE IN THE ORIGINAL CIRCUIT.
  • Page 15 2. POWER INTERFACE CIRCUIT DIAGRAM 2-10 2-11...

  • Page 16: Circuit Diagrams

    3. µ-COM(MAIN) CIRCUIT DIAGRAM 2-12 2-13...
  • Page 17 4. SERVO CIRCUIT DIAGRAM 2-14 2-15...
  • Page 18 5. I/O CIRCUIT DIAGRAM 2-16 2-17...
  • Page 19 6. MIC & USB & PTB CIRCUIT DIAGRAM 2-18 2-19...
  • Page 20 7. POWER KEY CIRCUIT DIAGRAM 2-20 2-21...
  • Page 21 8. TIMER CIRCUIT DIAGRAM 2-22 2-23...
  • Page 22 9. HDMI CIRCUIT DIAGRAM 2-24 2-25...
  • Page 23 PRINTED CIRCUIT BOARD DIAGRAMS 1. MAIN P.C. BOARD DIAGRAM ( TOP VIEW ) 2-26 2-27...
  • Page 24 2. MAIN P.C. BOARD DIAGRAM ( BOTTOM VIEW ) 2-28 2-29...
  • Page 25 3. SMPS P.C. BOARD NOTES) Warning NOTES) Parts that are shaded are critical NOTES) with respect to risk of fire or NOTES) electricial shock. 2-30 2-31...
  • Page 26 4. KEY P.C. BOARD 5. TIMER P.C. BOARD 2-32 2-33...
  • Page 27 6. USB P.C. BOARD 2-34 2-35...

  • Page 28: Electrical Troubleshooting Guide

    SECTION 3. DVD & AMP PART ELECTRICAL TROUBLESHOOTING GUIDE 1. AMP PROTECTION "PROTECTION" appears on the FLD. After unplug power cord, connect again. Power on. "PROTECTION" appears continuously on the FLD. Is the IC101 pin64 Replace IC101. "LOW" signal(0V)? Replace the Q703, Q704 and Q705. Is the Q703, Q704 and 705 normal? Replace TI AMP IC(IC701~704).
  • Page 29 2. SYSTEM OPERATION FLOW Power On 1. IC101 initializes SERVO, DSP & RISC registers 2. Write RISC code to SDRAM 3. Reset RISC Show LOGO Tray Closed? Tray Close to Closed position SLED at Inner Side? SLED Moves to Inner Position 1.
  • Page 30 3. TEST & DEBUG FLOW TEST Check the AC Vol tage Check the POWER PART Power PCBA (110V or 220V) Switch on the Power PCBA Is the DC Voltage outputs OK? (-35V, -30V, -33V, ±12V, Check the POWER PART 3.5V, 5.6V, 5V, ±12V, 5.6V, 3.3V, 5V, 7V, 32.5V) Are 3.3V and 5V DC...
  • Page 31 ES8381 Check connection lines between SDRAM(IC502) & ES8381 and the SDRAM is damaged. ES8381 Check the related circuit of ES8381 VIDEO outputs IC501 Pins133, 134, 137, 138, 139, 140 properly? Normal OPEN_SW, CLOSE_SW signal? Check the Tray control IO pins on ES8381.
  • Page 32 Motor Check the connection line of Driver DRV_MUTE DRV_MUTE pin is High? Motor Check the related circuit of Driver DRV_MUTE SLEGN pin is High? SLED+ and SLED- output properly? Check Focus connection on ES8381 and motor driver.
  • Page 33 Check the laser power circuit on ES8381 and connecting to power transistor.(Q405, Q406) Collector voltage of power transistor is OK? (Q405, Q406) Proper Check the related circuit on RF signal on ES8381 ES8381 RF signal. Check the RF connection between IP9009 and ES8381. Proper SPINDLE signal on ES8381.
  • Page 34 Proper Check connections between signals on A, B, C, ES8381 and pick-up head. D of ES8381 Proper Check the related circuit on CD-DVDCT signal ES8381 CD-DVDCT on ES8381 Check CD_DVDCT connection between IP9009 and ES8381 Proper Check the related circuit on CD-DVDCT signal ES8381.
  • Page 35 PWM IC Check connection between received correct data IC601 BCK, LRCK, ADATAO stream? Normal Check the related circuit of PWM IC out?(IC601) PWM.(Check Audio out Pins54, 55, 58, 59, 61, 62, 67, 68, 70, 71, 74, 75 Check Digital Amp circuit (IC701, IC702, IC703, IC704)

  • Page 36: Opt.

    4. AUDIO µ-COM CIRCUIT(DVD & AMP) POWER ON Does CD/DVD appear Does AV1, TV Audio, AV1 opt. at FLD? and FM 87.5 appear at FLD Does Loading appear Does it appear DVD Error at FLD? at FLD? Does no Disc or Time Check power part of Main Refer to SMPS.

  • Page 37: Details And Waveforms On System Test And Debugging

    DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING 1. SYSTEM 27MHz CLOCK,RESET,FLASH R/W SIGNAL 1) ES8381 main clock is at 27MHz(X501) 3.8V, 27MHz FIG 1-1 2) ES8381 reset is high active. Power Cord in 5.2VA PWR_CTL(SYSTEM µ-COM) (IC101 PIN2) DVD_RESET(IC101 PIN 41) MRST#(IC501 PIN 251) FIG 1-2 3-10...
  • Page 38 3) Flash R/W enable signal during download(Downloading) FRD(IC503 PIN 28) FWR(IC503 PIN 11) FIG 1-4 2. SDRAM CLOCK 1) ES8381 main clock is at 27MHz(X501) DCLK = 93MHz, Vp-p=2.2, Vmax=2.7V (IC502 PIN 38) FIG 2-1 3-11...
  • Page 39 3. TRAY OPEN/CLOSE SIGNAL 1) Tray open/close waveform OPENSW(P4402 PIN3) CLOSESW(P4402 PIN4) OPEN(IC401 PIN 1) CLOSE(IC401 PIN 2) FIG 3-1 2) Tray close waveform OPENSW(P4402 PIN3) CLOSESW(P4402 PIN4) OPEN(IC401 PIN 1) CLOSE(IC401 PIN 2) FIG 3-2 3-12...
  • Page 40 3) Tray open waveform OPENSW(P4402 PIN3) CLOSESW(P4402 PIN4) OPEN(IC401 PIN 1) CLOSE(IC401 PIN 2) FIG 3-3 4. SLED CONTROL RELATED SIGNAL (NO DISC CONDITION) SLO(2.0V/1.4V/1.0V) (IC501 PIN 209) DRV_MUTE(5V) – (IC401 PIN 21) SLED+(4.7V/3.6V/1.9V) (IC401 PIN 17) SLED-(5.3V/3.7V/2.5V) (IC401 PIN 18) FIG 4-1 3-13...
  • Page 41 5. LENS CONTROL RELATED SIGNAL(NO DISC CONDITION) FOO(1.5V/1.4V/1.3V) (IC501 PIN 208) F+(4.0V/3.6V/3.2V) (IC401 PIN 13) F-(4.0V/3.6V/3.2V) (IC401 PIN 14) FIG 5-1 6. LASER POWER CONTROL RELATED SIGNAL(NO DISC CONDITION) DVD MDI(0V/180mV) (IC501 PIN 188) DVDLDO501(5.0V//3.5V) (IC501 PIN 185) CDLDO(5.0V/3.6V) (IC501 PIN 186) FIG 6-1 3-14...
  • Page 42 7. DISC TYPE JUDGEMENT WAVEFORMS F+(IC401 PIN 13) CD_DVDCT(IC501 PIN 169) RF(IC501 PIN 196) FIG 7-1 (DVD) F+(IC401 PIN 13) CD_DVDCT(IC501 PIN 169) RF(IC501 PIN 196) FIG 7-2 (DVD) 3-15...
  • Page 43 F+(IC401 PIN 13) CD_DVDCT(IC501 PIN 169) RF(IC501 PIN 196) FIG 7-3 (CD) F+(IC401 PIN 13) CD_DVDCT(IC501 PIN 169) RF(IC501 PIN 196) FIG 7-4 (CD) 3-16...
  • Page 44 8. FOCUS ON WAVEFORMS CD_DVDCT(IC501 PIN 169) FOO(IC501 PIN208) F+(IC401 PIN 13) F-(IC401 PIN 14) FIG 8-1 (DVD) CD_DVDCT(IC501 PIN 169) FOO(IC501 PIN208) F+(IC401 PIN 13) F-(IC401 PIN 14) FIG 8-2 (CD) 3-17...
  • Page 45 9. SPINDLE CONTROL WAVEFORMS (NO DISC CONDITION) SPINO(1.4V/1.8V) (IC501 PIN 207) SP-(3.6V/2.4V) (IC501 PIN 192) SP+(3.6V/4.8V) (IC501 PIN 191) FIG 9-1 10. TRACKING CONTROL RELATED SIGNAL(System checking) CD_DVDCT(IC501 PIN 169) TRO(IC501 PIN 210) TR-(IC401 PIN 12) TR+(IC401 PIN 11) FIG 10-1(DVD) 3-18...
  • Page 46 CD_DVDCT(IC501 PIN 169) TRO(IC501 PIN 210) TR-(IC401 PIN 12) TR+(IC401 PIN 11) FIG 10-2(CD) 11. ES6698FD VIDEO OUTPUT WAVEFORMS 1) Full colorbar signal(COMPOSIT) (IC501 PIN 134) FIG 11-1 3-19...
  • Page 47 2) Y (IC501 PIN 140) FIG 11-2 12. AUDIO OUTPUT FROM PWM IC 1) Audio L/R (IC602 PIN 1, 7) FIG 12-1 3-20...
  • Page 48 2) Audio related Signal ASDATA3 ADATA0(IC501 PIN 154) BCK(IC501 PIN 155) LRCK(IC501 PIN 156) FIG 12-2 3-21...
  • Page 49 13. DVD & AMP WAVEFORMS • R620 → TP611 • R618 → TP609 R621 TP612 R619 TP610 • R612 → TP603 • R610 → TP601 R613 TP604 R611 TP602 • R614 → TP605 • R616 → TP607 R615 TP606 R617 TP608 3-22...

  • Page 50: Dvd & Amp Circuit Diagrams

    DVD & AMP CIRCUIT DIAGRAMS 1. MPEG CIRCUIT DIAGRAM 3-22 3-23...
  • Page 51 2. DSP CIRCUIT DIAGRAM 3-24 3-25...
  • Page 52 3. AMP CIRCUIT DIAGRAM 3-26 3-27...
  • Page 53 PRINTED CIRCUIT BOARD DIAGRAMS 1. AMP P.C. BOARD DIAGRAM_TOP VIEW 3-28 3-29...
  • Page 54 2. AMP P.C. BOARD DIAGRAM_BOTTOM VIEW 3-30 3-31...

  • Page 55: Section 4. Exploded Views

    SECTION 4. EXPLODED VIEWS • CABINET AND MAIN FRAME SECTION_HT502’s NOTES) THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE LITERATURE. OPTIONAL PART...
  • Page 56 • DECK MECHANISM EXPLODED VIEW(DP-10A) 015B 015A 012A 012A...

  • Page 58: Packing Accessory Section

    • PACKING ACCESSORY SECTION 824 ANTENNA LOOP(AM) BATTERY 825 ANTENNA (FM) REMOCON INSTRUCTION ASSEMBLY PACKING, CASING PACKING, CASING...
  • Page 60 SECTION 5. SPEAKER SECTION • CENTER SPEAKER(SH52TH-C) 757A A70B A70A 757B WIRE70...
  • Page 61 4. LHS-96IA • FRONT/REAR SPEAKER(SH52TH-S) A80B A80A A80C 855B 855A WIRE WIRE82 : R.R WIRE80 : F.R WIRE81 : F.L WIRE83 : R.L...
  • Page 62 2. LHS-76IB • PASSIVE SUBWOOFER SPEAKER(SH52TH-W) A90B A90A WIRE90...

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