LG HT356SD Service Manual Download

Page: 1 / 61

P/NO : AFN73951821

JANUARY, 2011

DVD HOME THEATER SYSTEM

SERVICE MANUAL

MODEL: HT356SD

(HT356SD, SH36SD-S/W)

CAUTION

BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS”
IN THIS MANUAL.

Website http://biz.lgservice.com

Internal Use Only

MODEL: HT356SD (HT356SD, SH36SD-S/W)

SERVICE MANUAL

Summary of Contents for HT356SD

Page 1: ...E THEATER SYSTEM SERVICE MANUAL MODEL HT356SD HT356SD SH36SD S W CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL Website http biz lgservice com Internal Use Only MODEL HT356SD HT356SD SH36SD S W SERVICE MANUAL ...

Page 2: ...NG GUIDE 2 1 DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING 2 13 WIRING DIAGRAM 2 27 OVERALL BLOCK DIAGRAM 2 29 CIRCUIT DIAGRAMS 2 31 CIRCUIT VOLTAGE CHART 2 41 PRINTED CIRCUIT DIARGAMS 2 45 P SECTION 3 EXPLODED VIEWS CABINET AND MAIN FRAME SECTION 3 1 DECK MECHANISM EXPLODED VIEW DP 15T 3 3 PACKING ACCESSORY SECTION 3 5 SPEAKER SECTION 3 6 P SECTION 4 MECHANISM DP 15T 4 1 P SECTION 5 REPLACEM...

Page 3: ...beams may damage the eyes Absolutely never permit laser beams to enter the eyes Also NEVER switch ON the power to the laser output part lens etc of the pick up if it is damaged 5 Cleaning the lens surface If there is dust on the lens surface the dust should be cleaned away by using an air bush such as used for camera lens The lens is held by a delicate spring When cleaning the lens surface therefo...

Page 4: ... replacing a component part first disconnect the power supply lead wire from the unit 2 All equipment measuring instruments and tools must be grounded 3 The workbench should be covered with a conductive sheet and grounded When removing the laser pick up from its conductive bag do not place the pick up on the bag This is because there is the possibility of damage by static electricity 4 To prevent ...

Page 5: ...harges sufficient to damage ESD devices 5 Do not use freon propelled chemicals These can generate electrical charges sufficient to damage ESD devices 6 Do not remove a replacement ESD device from its protective package until immediately before you are ready to install it Most replacement ESD devices are packaged with leads electrically shorted together by conductive foam aluminum foil or comparabl...

Page 6: ...ress number 0 9 Press character A F 1 6 for a while Use arrow key V V V V to move to appropriate position and make changes Press pause key once Change will be applied when power OFF ON NAME OPT 1 OPT 2 OPT 3 OPT 4 OPT 5 OPT 6 OPT 7 OPT 8 OPT 9 OPT A HEX F1 00 A0 DD 00 11 A0 30 50 0C DETECT NEW EEPROM OPTION EDIT SCREEN ...

Page 7: ...DEL NAME ROM in upper cases Ex HT356 LG_HT356 ROM 2 Copy the file to the formatted USB and burn it 3 Move to the USB function and insert the USB to the set The upgrade information will be shown on the screen 4 Remove the USB press PLAY key of the remote control 5 Remove and reconnect the power cable when it changes to logo screen from upgrade information Then the upgrade process is completed 3 2 H...

Page 8: ...A jack x 2 ANALOG AUDIO IN 2 0 Vrms 1 kHz 0 dB 600 Ω RCA jack L R x 1 PORT IN 0 5 Vrms 3 5 mm stereo jack SYSTEM Laser Semiconductor laser wavelength 650 nm Signal system Standard NTSC PAL color TV system Frequency response 20 Hz to 20 kHz 48 kHz 96 kHz 192 kHz sampling Signal to noise ratio More than 80 dB Harmonic distortion 0 05 at 1 W Dynamic range More than 85 dB Bus Power Supply USB DC 5 V 5...

Page 9: ...ut Power 90 W Net Dimensions W x H x D 113 x 113 x 84 mm Net Weight 0 38 kg Center 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 Subwoofer Type 1 Way 1 Speaker Impedance Rated 8 Ω Input Power 75 W Max Input Power 150 W Net Dimensions W x H x D 155 x 325 x 265 mm Net Weight 3 kg Note Design and sp...

Page 10: ...ower Supply Circuit YES Check power supply circuit Check tracking servo circuit Check audio circuit NO NO NO Is power on YES Does it play YES Does it output audio YES YES Turn power on INSERT POWER CORD OK SECTION 2 ELECTRICAL PART ...

Page 11: ... if PN301 is ok Refer to SMPS part NO YES Check if the front power is ok YES Is the Digitron on correctly Check pattern and resoldering NO NO Check if DIS301 is ok YES Check if the remote control is ok YES Check if all buttons are ok POWER ON Front B D ok NO ...

Page 12: ...ont is ok YES Check if R346 R349 R352 R370 ok YES Refer to MICOM circuit 2 Refer to power SMPS NO Check if the power part of the front is ok YES Refer to MICOM circuit NO Check if the remote control waveform of PN301 pin5 is ok YES Check RM circuit NO Check if RC301 voltage is ok 3 3V YES Resolder or Replace RC301 ...

Page 13: ...close to closed position SLED at inner side Recieve OPEN CLOSE Key Receive CLOSE Key SLED moves to inner position 1 Judge whether have disc and disc type 2 Jump to related disc reading procedure 1 Execute Pressed Key IR Key 2 System operation routine loop NO NO NO NO YES 1 Stop Playback Open Tray 2 Display tray open message LOGO POWER ON YES YES ...

Page 14: ...s or diode NO 1 Check 27MHz system clock 2 Check system reset circuit 3 Check FLASH R W enable signal PRD RWR 4 Check FLASH Memory related circuit NO Replace FLASH NO YES Are the DC Voltage outputs OK 12V 3 3V 5V 7V 34V YES Are 3 3V and 5V DC outputs normal on main PCBA YES YES Update FLASH successfully YES Switch on the Power PCBA TEST A ...

Page 15: ...RAM works properly Check the related circuit of MT1389L IC501 Pins99 102 103 104 NO MT1389L VIDEO outputs properly Show LOGO NO Check the load OPEN CLOSE switch NO Check AV cable connection between main PCBA and loader MECHA YES YES YES Normal OPEN_SW CLOSE_SW signal Check the Tray control IO pins on MT1389L NO Normal TROPEN TRCLOSE signal Check the Tray control MOTOR SERVO circuit IC400 NO Normal...

Page 16: ...or Driver M_STBY pin is High Check the AMP circuit on motor driver NO SLED and SLED output properly Does the SLED move to inner side when it is at outer position NO Check Focus connection on MT1389L and motor driver NO Check cable connection with pick up head YES YES Proper Focus outputs to motor driver Check the AMP circuit on motor driver NO Proper F F outputs Optical Lens has movements for sear...

Page 17: ...lated circuit on laser power transistor NO NO Collector voltage of power transistor is OK Q403 Q405 Laser turns on when reading disc Put disc in Check the cable connection between spindle and main PCB YES YES Check the spindle control AMP circuit of motor driver SPNP SPNN output properly NO Check the SPINDLE related circuit on MT1389L Proper SPINDLE signal on MT1389L Does spindle rotate NO Check t...

Page 18: ...g control AMP circuit on motor driver NO NO YES YES YES Check CD_DVDCT connection between AM5890 and MT1389L Check cable connection on pick up head YES YES Proper signals on A B C D of MT1389L NO Proper CD_DVDCT signal on MT1389L Focus on ok NO Disc Playback NO NO NO NO YES Proper CD_DVDCT signal on MT1389L YES Proper TRACK signal on MT1389L YES T T output properly Track On OK D YES E Check RF sig...

Page 19: ...ADATA0 YES YES Check Digital AMP circuit IC701 IC702 YES Check the related circuit of PWM Check Audio out Pins28 31 33 34 37 39 42 NO NO YES PWM IC received correct data stream Normal PWM IC out IC602 Normal Audio output when disc playback E TEST END ...

Page 20: ...ntinuously on the FLD Replace IC101 NO YES Is the IC101 pin54 LOW signal 0V Replace the Q701 and Q702 NO YES Is the Q701 and Q702 normal YES YES After unplug power cord connect again YES Power on PROTECTION appears on the FLD Replace TI AMP IC IC701 IC702 ...

Page 21: ... no Disc or Time appear at FLD YES Check if DVD and AUDIO CD insert is OK Check Power YES YES Replace IC101 YES NO NO NO NO Refer to SMPS Refer to oscillator circuit Check IC101 reset waveform NO YES Check 3 3V line Check power section circuit NO NO NO NO NO Check power part of Main B D Check oscillator of X101 Check if IC101 Pin5 is high YES YES YES Check if IC101 Pin9 36 59 are high 3 3V Check i...

Page 22: ...AND DEBUGGING 1 SYSTEM 27MHz CLOCK RESET FLASH R W SIGNAL 2 MT1389L reset is high active 1 MT1389L main clock is at 27MHz X500 12 21 40 20 19 1 38 39 2 16 26 13 29 31 11 3 24 33 30 10 28 18 4 FIG 1 1 1 FIG 1 2 ZUZ XU_ k kylzl YWW y G w G 2 3 4 ...

Page 23: ...2 14 3 Flash R W enable signal during download Downloading 2 SDRAM CLOCK 1 MT1389L main clock is at 27MHz X500 FIG 1 3 5 6 SF_DI SF_DO DCLK 93MHz Vp p 2 2 Vmax 2 7V FIG 2 1 7 SDCLK 6 5 7 ...

Page 24: ...form 2 Tray close waveform 3 Tray open waveform FIG 3 3 8 9 10 11 OPENSW CLOSESW OPEN CLOSE FIG 3 1 8 9 10 11 OPENSW CLOSESW OPEN CLOSE FIG 3 2 8 9 10 11 OPENSW CLOSESW OPEN CLOSE 17 22 27 15 9 11 10 28 14 8 18 35 16 26 17 22 27 11 3 24 33 30 34 10 28 18 ...

Page 25: ...2 16 4 SLED CONTROL RELATED SIGNAL NO DISC CONDITION FIG 4 1 12 13 14 15 SLD M STBY SL SL 12 21 40 20 19 1 38 39 16 26 13 29 31 11 3 24 33 30 10 28 18 35 17 22 27 15 9 11 33 30 34 10 28 14 8 18 ...

Page 26: ...R CONTROL RELATED SIGNAL NO DISC CONDITION 5 LENS CONTROL RELATED SIGNAL NO DISC CONDITION FIG 6 1 19 20 21 FIG 5 1 16 17 18 FOD F F MDI1 DVDLD CDLD 3 16 26 17 22 27 9 11 3 24 33 30 34 10 28 8 18 12 21 40 20 19 1 38 39 ...

Page 27: ...MENT WAVEFORMS 23 This signal can see using special debug program FIG 7 1 DVD 22 23 24 F PU_DET RF FIG 7 2 DVD 22 23 24 F PU_DET RF 35 16 26 17 22 27 15 9 11 24 33 30 34 10 28 14 8 18 16 26 11 3 24 33 30 10 36 23 25 32 39 37 ...

Page 28: ...FIG 7 3 CD 22 23 24 23 This signal can see using special debug program F PU_DET RF FIG 7 4 CD 22 23 24 F PU_DET RF 35 16 26 17 22 27 15 9 11 24 33 30 34 10 28 14 8 18 16 26 11 3 24 33 30 10 36 23 25 32 39 37 ...

Page 29: ...S ON WAVEFORMS 25 This signal can see using special debug program FIG 8 1 DVD 25 26 27 28 PU_DET FOD F F FIG 8 2 CD 25 26 27 28 PU_DET FOD F F 36 23 25 32 39 37 3 16 26 17 22 27 15 9 11 3 24 33 30 34 10 28 14 8 18 ...

Page 30: ...2 21 9 SPINDLE CONTROL WAVEFORMS NO DISC CONDITION FIG 9 1 29 30 31 SPIND SP SP 35 16 26 17 22 27 15 13 29 31 9 11 3 24 33 30 34 10 28 14 8 18 ...

Page 31: ...LATED SIGNAL System checking 32 This signal can see using special debug program FIG 10 1 DVD 32 33 34 35 PU_DET TRO T T FIG 10 2 CD 32 33 34 35 PU_DET TRO T T 36 23 25 32 39 37 35 16 26 17 22 27 13 29 31 11 3 24 33 30 34 10 28 18 ...

Page 32: ...2 23 2 Y 11 MT1389L VIDEO OUTPUT WAVEFORMS 1 Full colorbar signal COMPOSIT FIG 11 1 36 FIG 11 2 37 CVBS Y_G 36 23 25 32 39 37 36 23 25 32 39 37 ...

Page 33: ...2 24 38 39 40 12 21 40 36 23 25 32 38 39 37 12 AUDIO OUTPUT FROM MT1389L 1 Audio related Signal FIG 12 1 ASDATA3 ADATA0 BCK LRCK ...

Page 34: ...2 25 1 FL R640 2 RL R641 3 WF R642 or WF R643 4 C R644 5 FR R645 6 RR R646 13 DVD AMP WAVEFORMS MT1389L 41 43 45 42 44 46 44 43 42 41 45 46 ...

Page 35: ...2 26 ...

Page 36: ...NT CVBS AUX SCART SPK TERMINAL 23PIN 9PIN 18PIN 14 PIN 12 PIN MD Tun er JK202 JK201 TU100 JK701 MAIN AMP PCB FRONT PCB USB MIC PCB VFD VOLUME MIC 1 2 USB PORT IN CN202 CN401 CN103 CN402 CN303 PN202 WIRING DIAGRAM 2009 11 24 2 27 2 28 ...

Page 37: ...F_DO SF_CLK 27MHZ ADC CS5346 V JACK 4 SCART AUX_IN 2 MM1692 MOTOR DRIVE IC AM5890 P UP M D DECK MECHANISM USB CON MIC I F Portable IN USBP USBN S4308 MIC_L R A B C D E F RF LDO1 LDO2 CD DVDMDI IOA VRCD VRDVD OPEN CLOSE FOCUS SLED SPINDLE TRACKIN AMP_STBY MPEG MT1389L 128PIN Y G PB B PR R CVBS R G B CVBS Y Pb Pr ADDATA MCLK LRCK BCK ADC_RST ADC_CLK ADC_DAT SANYO LC87F564A KEY 6965_DO 6965_CLK 6965_...

Page 38: ...ETY NOTICE WHEN SERVICING THIS CHASSIS UNDER NO CIRCUMSTANCES SHOULD THE ORIGINAL DESIGN BE MODIFIED OR ALTERED WITHOUT PERMISSION FROM THE LG CORPORATION ALL COMPONENTS SHOULD BE REPLACED ONLY WITH TYPES IDENTICAL TO THOSE IN THE ORIGINAL CIRCUIT SPECIAL COMPONENTS ARE SHADED ON THE SCHEMATIC FOR EASY IDENTIFICATION THIS CIRCUIT DIAGRAM MAY OCCASIONALLY DIFFER FROM THE ACTUAL CIRCUIT USED THIS WA...

Page 39: ... 15 13 29 31 9 11 6 20 19 23 25 3 32 1 5 38 24 33 30 34 10 28 14 8 18 39 37 A 1 2 3 4 5 6 7 8 9 10 11 12 B C D E F G H I J K L M N O P Q R S T MAIN AMP EBY60708001 01 REV 2 8 2010 12 15 2 MAIN AMP 1 CIRCUIT DIAGRAM WAVEFORM 2 33 2 34 ...

Page 40: ...3 MAIN AMP 2 CIRCUIT DIAGRAM 2 44 43 42 41 45 46 4 A 1 2 3 4 5 6 7 8 9 10 11 12 B C D E F G H I J K L M N O P Q R S T MAIN AMP EBY60708001 02 REV 2 8 2010 12 15 WAVEFORM 2 35 2 36 ...

Page 41: ...4 FRONT CIRCUIT DIAGRAM A 1 2 3 4 5 6 7 8 9 10 11 12 B C D E F G H I J K L M N O P Q R S T FRONT EBY60687401 REV 2 2 2009 11 24 2 37 2 38 ...

Page 42: ...5 FRONT JACK CIRCUIT DIAGRAM A 1 2 3 4 5 6 7 8 9 10 11 12 B C D E F G H I J K L M N O P Q R S T FRONT JACK EBY60687501 REV 2 4 2009 12 22 2 39 2 40 ...

Page 43: ...DQ3 3 0 3 6 3 21 0 39 3 31 0 29 9 VDDQ9 3 0 3 6 3 21 0 39 3 31 0 29 14 VDD14 3 0 3 6 3 21 0 39 3 31 0 29 27 VDD27 3 0 3 6 3 21 0 39 3 31 0 29 43 VDDQ43 3 0 3 6 3 21 0 39 3 31 0 29 49 VDDQ49 3 0 3 6 3 21 0 39 3 31 0 29 IC504 EEPROM 8 VCC 1 8 5 5 Read 2 7 5 5 write 3 41 2 09 3 4 2 1 Location Pin No Spec EE Mode V Margin Playback Mode V Margin IC602 PWM PS9850 16 VDD_IO 3 24 3 24 24 VDD_IO 3 24 3 24 ...

Page 44: ...0 10 V 3 16 V 0 V 3 16 V 6 84 V 3 16 0 3 16 V 6 84 V C532 100 10 V 3 17 V 0 V 3 17 V 6 83 V 3 16 V 0 V 3 16 V 6 84 V C538 10 16 V 1 47 V 0 V 1 47 V 14 53 V 1 58 V 0 V 1 58 V 14 42 V C549 220 10 V 3 22 V 0 V 3 22 V 6 78 V 3 22 V 0 V 3 22 V 6 78 V C563 10 16 V 3 21 V 0 V 3 21 V 12 79 V 3 19 V 0 V 3 19 V 12 81 V C565 10 16 V 3 21 V 0 V 3 21 V 12 79 V 3 2 V 0 V 3 2 V 12 8 V C613 10 16 V 1 24 V 0 V 1 2...

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 2 49 2 50 NOTE Warning Parts that are shaded are critical With respect to risk of fire or electrical shock ...

Page 48: ...3 FRONT P C BOARD DIAGRAM TOP VIEW FRONT P C BOARD DIAGRAM BOTTOM VIEW 4 FRONT JACK P C BOARD DIAGRAM TOP VIEW FRONT JACK P C BOARD DIAGRAM BOTTOM VIEW 2 51 2 52 ...

Page 49: ...2 53 2 54 ...

Page 50: ...4 284 283 282 463 CABLE1 D E A47 463 SMPS MAIN FRONT JACK 279 CABINET AND MAIN FRAME SECTION SECTION 3 EXPLODED VIEWS 3 1 3 2 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 ...

Page 51: ...012 010 012 037 012A 019 442 442 A02 A01 A03 001 002 003 439 018 013 017 014 020 016 440 015 015B 015A 435 026 DECK MECHANISM EXPLODED VIEW DP 15T 3 3 3 4 ...

Page 52: ...3 5 825 FM Antenna 801 Owner s Manual 803A Speaker Packing 803B Speaker Packing 803C Speaker Packing 803 Packing 900 Remote Control 811 Video Cable 808 Battery 802 Box 804 Bag PACKING ACCESSORY SECTION ...

Page 53: ...CTION 1 FRONT REAR CENTER SPEAKER SH36SD S 851 853 854 852 855F Front Center SPK Wire 3M 855R Rear SPK Wire 7M A800 Front Left SPK A810 Front Right SPK A600 Rear Left SPK A610 Rear Right SPK A700 Center SPK 850A 850B ...

Page 54: ...3 7 2 PASSIVE SUBWOOFER SH36SD W A900 950 951 952 ...

Page 55: ...3 8 ...

Page 56: ... 3 1 1 2 Magnet Clamp 4 3 1 1 3 Clamp Upper 4 3 2 Tray Disc 4 3 3 Base Assembly Sled 4 4 3 1 Gear Feed 4 4 3 2 Gear Middle 4 4 3 3 Gear Rack 4 4 4 Rubber Rear 4 4 5 Frame Assembly Up Down 4 5 6 Belt Loading 4 5 7 Gear Pulley 4 5 8 Gear Loading 4 5 9 Guide Up Down 4 5 10 PWB Assembly Loading 4 5 11 Base Main 4 5 EXPLODED VIEW 1 DECK MECHANISM EXPLODED VIEW DP 15T 4 6 SECTION 4 MECHANISM DP 15T ...

Page 57: ...1 2 7 12 13 14 15 16 17 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 Main Base Clamp Assembly Disc Plate Clamp Magnet Clamp Clamp Upper Tray Disc Base Assembly Sled Gear Feed Gear Middle Gear Rack Rubber Rear Frame Assembly Up Down Belt Loading Gear Pulley Gear Loading Guide Up Down PWB Assembly Loading Base Main 4 Screws 1 Connector 1 Locking Tabs 1 Screw 1 Screw 1 Locking Tab 1 Locking Tab 1 Loc...

Page 58: ...e Plate Clamp 1 1 2 Magnet Clamp 1 1 3 Clamp Upper 2 Tray Disc Fig 4 2 1 Insert and push a Driver in the emergency eject hole A at the right side or put the Driver on the Lever B of the Gear Emergency and pull the Lever B in direction of arrow so that the Tray Disc is ejected about 15 20mm 2 Pull the Tray Disc until it is separated from the Base Main completely MAIN BASE TRAY DISC BASE MAIN LEVER ...

Page 59: ...Feed 3 2 Gear Middle 3 3 Gear Rack 4 Rubber Rear Fig 4 3 BASE PU RUBBER DAMPER RUBBER DAMPER RUBBER DAMPER Distinguish upper and lower sides Assemble with care Distinguish upper and lower sides Assemble with care RUBBER DAMPER GEAR RACK GENERAL PICK UP ASSEMBLY SPINDLE MOTOR ASSEMBLY Fig 4 3 S2 S2 ...

Page 60: ...de Up Down Fig 4 4 1 Move the Guide Up Down in direction of arrow A as Fig A 2 Push the Locking Tab L5 down and then lift up the Guide Up Down to separate it from the Base Main Note When reassembling place the Guide Up Down as Fig C and move it in direction arrow B until it is locked by the Locking Tab L5 And confirm the Guide Up Down as Fig A 10 PWB Assembly Loading Fig 4 4 Note Put the Base Main...

Page 61: ...4 6 012 010 012 037 012A 019 442 442 A02 A01 A03 001 002 003 439 018 013 017 014 020 016 440 015 015B 015A 435 026 DECK MECHANISM EXPLODED VIEW DP 15T ...

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