LG HT356SD Service Manual
  1. Manuals
  2. Brands
  3. LG Manuals
  4. Home Theater System
  5. HT356SD
  6. Service manual

LG HT356SD Service Manual

Hide thumbs Also See for HT356SD:
Table of Contents

Advertisement

Quick Links

See also: Owner's Manual
Internal Use Only
Website http://biz.lgservice.com
DVD HOME THEATER SYSTEM
SERVICE MANUAL
MODEL: HT356SD
(HT356SD, SH36SD-S/W)
CAUTION
BEFORE SERVICING THE UNIT, READ THE "SAFETY PRECAUTIONS"
IN THIS MANUAL.
P/NO : AFN73951821
JANUARY, 2011

Advertisement

Table of Contents
loading

Related Manuals for LG HT356SD

Summary of Contents for LG HT356SD

  • Page 1 Internal Use Only Website http://biz.lgservice.com DVD HOME THEATER SYSTEM SERVICE MANUAL MODEL: HT356SD (HT356SD, SH36SD-S/W) CAUTION BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS” IN THIS MANUAL. P/NO : AFN73951821 JANUARY, 2011...

  • Page 2: Table Of Contents

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

  • Page 3: Section 1. General

    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: Service Information For Eeprom

    SERVICE INFORMATION FOR EEPROM POWER ON DETECT NEW EEPROM DVD LOGO Status (NO Disk status) (OPTION EDIT SCREEN) NAME Remote control OPT 1 Pause key-->1-->4-->7-->2 in order. OPT 2 OPT 3 OPT 4 OPT 5 Press number 0~9, Press character OPT 6 OPT 7 A~F (1~6 for a while)

  • Page 7: How To Update Dvd & Audio Micom Programs

    HOW TO UPDATE DVD & AUDIO MICOM PROGRAMS 1. The Whole Sequence 1) DVD program download. 2) Power cord out −> in. 3) Audio micom program download. 4) Remote control Pause key ‘ ’ + ‘1472’ for input options. 5) Enter into the system information for check the version, options and check sum. 6) Power off −>...

  • Page 8: Specifications

    SPECIFICATIONS • GENERAL Power requirements Refer to main label. Power consumption Refer to main label. Dimensions (W x H x D) Approx. 360 x 65 x 320 mm without foot Net Weight (Approx.) 2.5 kg Operating conditions Temperature 5 °C to 35 °C (41 °F to 95 °F) Operating humidity 5 % to 90 % •...
  • Page 9 • SPEAKERS Front Speaker Type 1 Way 1 Speaker Impedance Rated 4 Ω Input Power 45 W Max. Input Power 90 W Net Dimensions (W x H x D) 113 x 113 x 84 mm Net Weight 0.34 kg Rear Speaker Type 1 Way 1 Speaker Impedance Rated...

  • Page 10: Section 2. Electrical Part

    SECTION 2. ELECTRICAL PART TROUBLESHOOTING GUIDE 1. Power Supply Circuit INSERT POWER CORD. Turn power on. Check power supply circuit. Is power on? Check tracking servo circuit. Does it play? Does it output Check audio circuit. audio?

  • Page 11: Front Circuit

    2. Front circuit (1/2) POWER ON. Is the Digitron on Check if Reconnect it. correctly? PN301 is ok? Check if all Check if the front Refer to SMPS part. buttons are ok? power is ok? Check if the remote control is ok? Check if Check pattern and resoldering Front B/D ok.
  • Page 12 3. Front circuit (2/2) Check if the power part of the Refer to power(SMPS). front is ok? Check if R346~R349, R352, R370 Replace R346~R349, R352, R370. Refer to MICOM circuit. Check if the power part of the front Refer to power(SMPS). is ok? Check if the remote control waveform of PN301...

  • Page 13: System Operation Flow

    4. System operation flow POWER ON. 1. 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 14 5. Test & debug flow TEST. Check the Check the POWER PART. AC voltage Power PCBA (110V or 220V). Switch on the Power PCBA. Are the DC Voltage outputs OK? (12V, Check the POWER PART. 3.3V, 5V, 7V, 34V). Are 3.3V and 5V DC outputs normal on main Check the regulators or diode.
  • Page 15 Power On. Check connection lines Flash between FLASH & MT1389L Memory operates Show LOGO? and the FLASH access time properly? whether is suitable or not. Check connection lines SDRAM between SDRAM(IC503) & works properly? MT1389L and the SDRAM is damaged. MT1389L Check the related circuit of VIDEO outputs...
  • Page 16 Does Motor the SLED move to inner Check the connection line of Driver M_STBY side when it is at outer M_STBY. pin is high? position? Motor Check the related circuit of Driver M_STBY SLD. pin is High? SLED+ and Check the AMP circuit on SLED- output motor driver.
  • Page 17 Check the laser power circuit Laser DVDLD or on MT1389L and turns on when CDLD output connecting to power reading disc? property? transistor(Q403, Q405). Collector Check the related circuit on voltage of power transistor laser power transistor. is OK?(Q403, Q405) Check cable connection between transistor output and pick-up head.
  • Page 18 Proper Check connections between signals on A, B, C, Focus on ok? MT1389L and pick-up head. D of MT1389L. Proper Check the related circuit on CD_DVDCT signal on MT1389L CD_DVDCT. MT1389L. Check CD_DVDCT connection between AM5890 and MT1389L. Proper Check the related circuit on CD_DVDCT signal on Track On OK? MT1389L.
  • Page 19 Normal Audio PWM IC Check connection between output when disc received correct data IC602 BCK, LRCK, ADATA0. playback? stream? Check the related circuit of Normal PWM.(Check Audio out PWM IC out?(IC602). Pins28, 31, 33, 34, 37, 39, 42). Check Digital AMP circuit (IC701, IC702).
  • Page 20 6. AMP Protection "PROTECTION" appears on the FLD. After unplug power cord, connect again. Power on. "PROTECTION" appears continuously on the FLD. Is the IC101 pin54 Replace IC101. "LOW" signal(0V)? Is the Q701 and Replace the Q701 and Q702. Q702 normal? Replace TI AMP IC(IC701, IC702) 2-11...
  • Page 21 7. AUDIO μ-COM Circuit(DVD & AMP) Power On. Does Does Aux, Scart, opt and FM 87.5 CD/DVD appear at appear at FLD. FLD? Does Does Reading appear it appear DVD Error at FLD? at FLD? Check Does no Disc or Time power part of Main Refer to SMPS.

  • Page 22: 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) MT1389L main clock is at 27MHz(X500) 12 21 FIG 1-1 2) MT1389L reset is high active. FIG 1-2 16 26 2-13...
  • Page 23 3) Flash R/W enable signal during download(Downloading) SF_DI SF_DO FIG 1-3 2. SDRAM CLOCK 1) MT1389L main clock is at 27MHz(X500) DCLK = 93MHz, Vp-p=2.2, Vmax=2.7V SDCLK FIG 2-1 2-14...
  • Page 24 3. TRAY OPEN/CLOSE SIGNAL 1) Tray open/close waveform 2) Tray close waveform OPENSW OPENSW CLOSESW CLOSESW OPEN OPEN CLOSE CLOSE FIG 3-1 FIG 3-2 3) Tray open waveform OPENSW 17 22 27 CLOSESW OPEN CLOSE FIG 3-3 16 26 17 22 27 2-15...
  • Page 25 4. SLED CONTROL RELATED SIGNAL (NO DISC CONDITION) M-STBY 12 21 FIG 4-1 16 26 17 22 27 2-16...
  • Page 26 5. LENS CONTROL RELATED SIGNAL(NO DISC CONDITION) 16 26 17 22 27 FIG 5-1 6. LASER POWER CONTROL RELATED SIGNAL(NO DISC CONDITION) MDI1 DVDLD 12 21 CDLD FIG 6-1 2-17...
  • Page 27 7. DISC TYPE JUDGEMENT WAVEFORMS 16 26 PU_DET 17 22 27 FIG 7-1 (DVD) 23 : This signal can see using special debug program PU_DET 23 25 32 FIG 7-2 (DVD) 16 26 2-18...
  • Page 28 16 26 PU_DET 17 22 27 FIG 7-3 (CD) 23 : This signal can see using special debug program PU_DET 23 25 32 FIG 7-4 (CD) 16 26 2-19...
  • Page 29 8. FOCUS ON WAVEFORMS 25 : This signal can see using special debug program PU_DET 23 25 32 FIG 8-1 (DVD) PU_DET 16 26 FIG 8-2 (CD) 17 22 27 2-20...
  • Page 30 9. SPINDLE CONTROL WAVEFORMS (NO DISC CONDITION) SPIND FIG 9-1 16 26 17 22 27 2-21...
  • Page 31 10. TRACKING CONTROL RELATED SIGNAL(System checking) 32 : This signal can see using special debug program PU_DET 23 25 32 FIG 10-1(DVD) PU_DET FIG 10-2(CD) 16 26 17 22 27 2-22...
  • Page 32 11. MT1389L VIDEO OUTPUT WAVEFORMS 1) Full colorbar signal(COMPOSIT) CVBS 23 25 32 FIG 11-1 2) Y 23 25 32 FIG 11-2 2-23...
  • Page 33 12. AUDIO OUTPUT FROM MT1389L 1) Audio related Signal ADATA0 ASDATA3 12 21 LRCK 23 25 32 FIG 12-1 2-24...
  • Page 34 13. DVD & AMP WAVEFORMS MT1389L • FL+ : R640 • RL+ : R641 • WF- : R642 • C+ : R644 WF+ : R643 • FR+ : R645 • RR+ : R646 2-25...
  • Page 35 2-26...

  • Page 36: Wiring Diagram

    WIRING DIAGRAM JK202 JK201 TU100 JK701 COMPONENT SCART SPK TERMINAL CVBS CN402 CN401 9PIN 18PIN CN103 MAIN+AMP PCB CN202 12 PIN 14 PIN SMPS PCB VOLUME FRONT PCB CN303 USB/MIC PCB PN202 MIC 1,2 PORT.IN WIRING DIAGRAM 2009.11.24 2-27 2-28...

  • Page 37: Overall Block Diagram

    OVERALL BLOCK DIAGRAM ST_IND Portable IN AUX_IN V-JACK(4) SCART TUNER_CL TUNER_DAT AMP IC+OPAMP Tuner RDS_CLK R/G/B TAS5342DDV RDS_DAT CVBS Y/Pb/Pr MM1692 27MHZ Y/G,PB/B,PR/R CVBS ADDATA CS5346 ADC_RST SERIAL ADC_CLK FLASH ADC_DAT MCLK, LRCK, PWM_RST DVD_CLK SANYO PS9850 PWMT_CLK DVD_DI LC87F564A MPEG SF_CS, SF_DI, PWM_DAT...

  • Page 38: Circuit Diagrams

    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 IDENTICAL THE SET IS NOT DELAYED UNTIL THE NEW SERVICE TO THOSE IN THE ORIGINAL CIRCUIT.
  • Page 39 2. MAIN & AMP - 1 CIRCUIT DIAGRAM 23 25 16 26 17 22 27 MAIN&AMP EBY60708001(#01) REV 2.8 WAVEFORM 2010. 12. 15 2-33 2-34...

  • Page 40: Circuit Diagrams

    3. MAIN & AMP - 2 CIRCUIT DIAGRAM MAIN&AMP EBY60708001(#02) REV 2.8 WAVEFORM 2010. 12. 15 2-35 2-36...
  • Page 41 4. FRONT CIRCUIT DIAGRAM FRONT EBY60687401 REV 2.2 2009.11.24 2-37 2-38...
  • Page 42 5. FRONT JACK CIRCUIT DIAGRAM FRONT JACK EBY60687501 REV 2.4 2009.12.22 2-39 2-40...

  • Page 43: Circuit Voltage Chart

    CIRCUIT VOLTAGE CHART 1. ICs ON MAIN AND AMP BOARD Playback Playback Location Pin No. Spec. EE Mode(V) Margin Margin Location Pin No. Spec. EE Mode(V) Margin Margin Mode(V) Mode(V) IC101 MICOM (LC87F5M64A) IC602 PWM (PS9850) 9(VDD2) 2.8~5.5 16(VDD_IO) 3.24 3.24 36(VDD3) 2.8~5.6...
  • Page 44 3. CAPACITORS ON MAIN AND AMP BOARD EE Mode Playback EE Mode Playback Capacitor Voltage Capacitor Voltage Value(uF) Spec. Value(uF) Spec. Margin Margin Margin Margin C106 10 V 3.41 V 3.41 V 6.59 V 3.4 V 3.4 V 6.6 V C753 16 V 12.07 V...
  • Page 45 PRINTED CIRCUIT BOARD DIAGRAMS 1. MAIN P.C. BOARD DIAGRAM (TOP VIEW) 2-45 2-46...
  • Page 46 MAIN P.C. BOARD DIAGRAM (BOTTOM VIEW) 2-47 2-48...
  • Page 47 2. SMPS P.C. BOARD DIAGRAM NOTE: Warning Parts that are shaded are critical With respect to risk of fire or electrical shock. 2-49 2-50...
  • Page 48 3. FRONT P.C BOARD DIAGRAM (TOP VIEW) 4. FRONT JACK P.C. BOARD DIAGRAM (TOP VIEW) FRONT P.C BOARD DIAGRAM (BOTTOM VIEW) FRONT JACK P.C. BOARD DIAGRAM (BOTTOM VIEW) 2-51 2-52...
  • Page 49 2-53 2-54...

  • Page 50: Section 3. Exploded Views

    SECTION 3. EXPLODED VIEWS • CABINET AND MAIN FRAME SECTION 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. CABLE1 MAIN PN202 SMPS FRONT JACK...

  • Page 51: Deck Mechanism Exploded View (Dp-15T)

    • DECK MECHANISM EXPLODED VIEW (DP-15T) 015B 015A 012A...

  • Page 52: Packing Accessory Section

    • PACKING ACCESSORY SECTION 811 Video Cable 825 FM Antenna 808 Battery 801 Owner’s Manual 900 Remote Control 803 Packing 804 Bag 803A Speaker Packing 803B Speaker Packing 803C Speaker Packing 802 Box...

  • Page 53: Speaker Section

    • SPEAKER SECTION 1. FRONT/REAR/CENTER SPEAKER (SH36SD-S) A800 Front Left SPK A810 Front Right SPK A600 Rear Left SPK A610 Rear Right SPK A700 Center SPK 850A 850B 855F Front, Center SPK Wire (3M) 855R Rear SPK Wire (7M)
  • Page 54 2. PASSIVE SUBWOOFER (SH36SD-W) A900...

  • Page 56: Section 4. Mechanism (Dp-15T)

    SECTION 4. MECHANISM (DP-15T) [CONTENTS] DECK MECHANISM PARTS LOCATIONS • Top View ............. . . 4-2 •...

  • Page 57: 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 1, 2, 6 Gear Feed...

  • Page 58: 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) Insert and push a Driver in the emergency eject 1-1.

  • Page 59: 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) 4.

  • Page 60: Frame Assembly Up/Down

    GUIDE UP/DOWN GEAR LOADING GEAR PULLEY (L6) SCREW INSERTION (L6) TORGUE CONTROL (800gf DOWN) 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 61: Deck Mechanism Exploded View (Dp-15T)

    DECK MECHANISM EXPLODED VIEW (DP-15T) 015B 015A 012A...

This manual is also suitable for:

Sh36sd-sSh36sd-w

Table of Contents