LG LH-T3520X Service Manual

Dvd/cd receiver

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Internal Use Only
Website http://biz.lgservice.com
DVD/CD RECEIVER
SERVICE MANUAL
MODEL: LH-T3520X (LH-T3520X, SH33SD-S/W)
P/NO : AFN37064444
JANUARY, 2010

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Summary of Contents for LG LH-T3520X

  • Page 1 Internal Use Only Website http://biz.lgservice.com DVD/CD RECEIVER SERVICE MANUAL MODEL: LH-T3520X (LH-T3520X, SH33SD-S/W) P/NO : AFN37064444 JANUARY, 2010...
  • 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 (DVD PART) POWER ON DETECT NEW EEPROM DVD LOGO Status (NO Disk status) (OPTION EDIT SCREEN) NAME OPT 1 Remote control OPT 2 Pause key-->1-->4-->7-->2 in order. OPT 3 OPT 4 OPT 5 OPT 6 Press number 0~9, Press character OPT 7 A~F (1~6 for a while) OPT 8...
  • Page 7 SERVICE INFORMATION FOR EEPROM (MICOM PART) POWER ON FLD no disc status Remote control ‘2’ + Front ‘STOP’ DETECT NEW EEPROM push same timing during 5s (OPTION EDIT SCREEN) NAME OPT 1 OPT 2 FLD ‘OP-0…. OPT 3 OPT 4 OPT 5 Use arrow key ( ) move...
  • Page 8: How To Update Audio Micom & Dvd Programs

    HOW TO UPDATE AUDIO MICOM & DVD PROGRAMS 1. How to update AUDIO MICOM program. [Update using CD] 1. Change the filename to download as “(MODEL NAME)_(Version).HEX”. Only upper cases are permitted. ex) HT353 : “HT353_0709081.HEX” 2. Copy the file to the root folder of a CD and burn it. 3.
  • Page 9: Specifications

    SPECIFICATIONS GENERAL Power supply Refer to main label Power consumption Refer to main label Net Weight 2.5 kg External dimensions (W x H x D) 360 x 62 x 305 mm Operating conditions Temperature: 5°C to 35°C, Operation status: Horizontal Operating humidity 5% to 85% AMPLIFIER...
  • Page 10: Section 2. Electrical Part

    SECTION 2. ELECTRICAL PART TROUBLESHOOTING GUIDE 1. Power Supply Circuit INSERT POWER CORD. Check power plug and power Does red power led supply circuit. turn on? Turn power on. Check power supply circuit. Is power on? Does red power led Check laser circuit.
  • Page 11 2. Front circuit (1/2) POWER ON. Check if Reconnect it. Red LED turn off? PN103 is ok? Check if the front Is the Digitron on Refer to SMPS part. power is ok? correctly? Check if all buttons are ok? Check if the remote Check if Check pattern and resoldering control is ok?
  • Page 12 3. Front circuit (2/2) Check if the power part of the Refer to power(SMPS). front is ok? Check if R345 ~ R350 Replace R345 ~ R350. Refer to MICOM circuit. Check if the power Refer to power(SMPS). part of the front is ok? Check if the remote Refer to MICOM circuit.
  • Page 13 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. Judge whether have disc and disc type. 2.
  • Page 14 5. Test & debug flow TEST. Check the AC voltage Power PCBA (110 V Check the POWER PART. or 220 V). Switch on the Power PCBA. Are the DC Voltage outputs OK? (12 V, 5.6 V, Check the POWER PART. 3.5 V, 5 V, 7 V, 34 V).
  • Page 15 Power On. Check connection lines Flash between FLASH &MT1389/L Show LOGO? Memory operates and the FLASH access time properly? whether is suitable or not. Check connection lines SDRAM between SDRAM(IC504) & works properly? MT1389/L and the SDRAM is damaged. MT1389/L Check the related circuit of VIDEO outputs MT1389/L IC501 Pins99, 102,...
  • Page 16 Does Motor Check the connection line of the SLED move to inner Driver DRV_MUTE DRV_MUTE. side when it is at outer pin is high? position? Motor Check the related circuit of Driver DRV_MUTE SLEGN. pin is High? SLED+ and Check the amp circuit on SLED- output motor driver.
  • Page 17 Check the laser power circuit DVDLD or on MT1389/L and connecting Laser turns on when CDLD output to power transistor. reading disc? property? (Q401, Q402). Collector Check the related circuit on voltage of power transistor laser power transistor. is OK?(Q401, Q402) Check cable connection between transistor output and pick-up head.
  • Page 18 Proper Check connections between signals on A, B, C, Focus on ok? MT1389/L and pick-up head. D of MT1389/L. Proper Check the related circuit on CD-DVDCT signal MT1389/L CD-DVDCT. on MT1389/L. Check CD_DVDCT connection between AM5890 and MT1389/L. Proper Check the related circuit on CD-DVDCT signal Track On OK? MT1389/L.
  • Page 19 PWM IC Normal Audio Check connection between received correct data output when disc IC704 BCK, LRCK, ADATAO. playback? stream? Check the related circuit of Normal PWM.(Check Audio out PWM IC out?(IC704). Pins 55, 59, 61, 62, 68, 71, 75). Check Digital Amp circuit TEST END.
  • 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(0 V)? Replace the Q701 and Q702. Is the Q701 and Q702 normal? Replace ST AMP IC(IC702 and IC703) 2-11...
  • Page 21 7. AUDIO µ-COM Circuit(DVD & AMP) Power On. Does Does Aux, CD/DVD appear at Scart, opt and FM 87.5 appear at FLD. FLD? Does Does it appear DVD Error Loading appear at FLD? at FLD? Does Check 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 27 MHz CLOCK,RESET,FLASH R/W SIGNAL 1) MT1389/L main clock is at 27 MHz(X501) FIG 1-1 2) MT1389/L reset is high active. Power Cord in FIG 1-2 IC501 2-13...
  • Page 23 3) Flash R/W enable signal during download(Downloading) FIG 1-4 2. SDRAM CLOCK 1) MT1389/L main clock is at 27 MHz(X501) DCLK = 93MHz, Vp-p=2.2, Vmax=2.7V FIG 2-1 2-14...
  • Page 24 3. TRAY OPEN/CLOSE SIGNAL 1) Tray open/close waveform 2) Tray close waveform FIG 3-1 FIG 3-2 3) Tray open waveform FIG 3-3 2-15...
  • Page 25 4. SLED CONTROL RELATED SIGNAL (NO DISC CONDITION) FIG 4-1 2-16...
  • Page 26 5. LENS CONTROL RELATED SIGNAL(NO DISC CONDITION) FIG 5-1 6. LASER POWER CONTROL RELATED SIGNAL(NO DISC CONDITION) FIG 6-1 2-17...
  • Page 27 7. DISC TYPE JUDGEMENT WAVEFORMS FIG 7-1 (DVD) IC501 FIG 7-2 (DVD) IC501 2-18...
  • Page 28 FIG 7-3 (CD) IC501 FIG 7-4 (CD) IC501 2-19...
  • Page 29 8. FOCUS ON WAVEFORMS IC501 FIG 8-1 (DVD) FIG 8-2 (CD) 2-20...
  • Page 30 9. SPINDLE CONTROL WAVEFORMS (NO DISC CONDITION) FIG 9-1 10. TRACKING CONTROL RELATED SIGNAL(System checking) IC501 FIG 10-1(DVD) 2-21...
  • Page 31 FIG 10-2(CD) 11. MT1389/L VIDEO OUTPUT WAVEFORMS 1) Full colorbar signal(COMPOSIT) FIG 11-1 2-22...
  • Page 32 2) Y IC501 FIG 11-2 12. AUDIO OUTPUT FROM mt1389/L 1) Audio related Signal ASDATA3 IC501 FIG 12-1 2-23...
  • Page 33 13. DVD & AMP WAVEFORMS • R703 → TP704 • R720 → TP711 • R704 → TP707 • R709 → TP713 R717 → TP705 • R707 → TP702 • R701 → TP708 2-24...
  • Page 34 INTERNAL BLOCK DIAGRAM OF ICs 1. IC501 MPEG(MT1389L) • PIN CONFIGURATION VREF DACVDDC GPIO13 SPDIF / GPIO12 GPIO11 GPIO10 DVDD18 AVDD18_2 GPIO9 AVDD33_1 XTALI GPIO8 XTALO GPIO7 / CKE AGND33 DVDD33 REXT MDI1 MT1389L RA10 MDI2 LDO1 DVSS18 LDO2 AVDD33_2 RAS# CAS# TRAY_OPEN...
  • Page 35 1. IC501 MPEG(MT1389L) • BLOCK DIAGRAM CVBS, Y/C Debug 108MHz Port Component Module TV Encoder Video RF Amplifier Video DAC Servo IO Motor Servo Video Drive Processor Processo r interlacer Spindle Control FLASH MPEG-1/2/4 Audio JPEG Memory Video Decoder Controller Internal 6ch Audio DACs 6ch Audio Analog...
  • Page 36 1. IC501 MPEG(MT1389L) • PIN DESCRIPTION • Abbreviations: SR: Slew Rate PU: Pull Up PD: Pull Down SMT: Schmitt Trigger 4mA~16mA: Output buffer driving strength. Main Alt. Type Description Analog I nterface (66) RFIP Analog Input AC coupled DVD RF signal input RFIP RFIN OPOUT Analog Input...
  • Page 37 Main Alt. Type Description DACVDDB Power 3.3V power pin for video DAC circuitry DACVDDA Power 3.3V power pin for video DAC circuitry Analog Green, Y, SY, or CVBS B/CB/PB Analog Blue, CB/PB, or SC R/CR/PR Analog Red, CR/PR, CVBS, or SY AADVSS Ground Ground pin for 2ch audio ADC circuitry...
  • Page 38 Main Alt. Type Description DVSS18 Ground 1.8V Ground pin for internal digital circuitry 50, 68,84 DVDD33 Power 3.3V power pin for internal digital circuitry DVSS Ground 3.3V Ground pin for internal digital circuitry Micro Controller , Flash I nterface and GPIO(12) InOut 1) General purpose IO 3 GPIO3...
  • Page 39 Main Alt. Type Description InOut RD12 DRAM data 12 InOut RD11 DRAM data 11 InOut RD10 DRAM data 10 InOut DRAM data 9 InOut DRAM data 8 InOut DQM1 Data mask 1 4mA, PD InOut RCLK Dram clock 4mA, PD InOut RA11 DRAM address bit 11...
  • Page 40 Main Alt. Type Description 6) Audio Mute 7) HSYN/VSYN input 8) C1 1) GPIO9 2) MS_D0 set A InOut 3) SD_CMD set A GPIO9 4mA, PD 4) ASDATA1 5) ABCK 6) C2 7) RXD1 1) GPIO10 2) SD_CLK set B 3) SD_D0 set A InOut 4) ASDATA0...
  • Page 41 2. IC401 MOTOR DRIVER • PIN CONFIGURATION • BLOCK DIAGRAM 2-32...
  • Page 42 1. IC501 MPEG(MT1389L) • PIN DESCRIPTION 2-33...
  • Page 43 3. IC101 MICOM1389L) • PIN CONFIGURATION 47 46 P70/INT0/T0LCP/AN8 P32/UTX1 P71/INT1/T0HCP/AN9 P33/URX1 P72/INT2/T0IN/NKIN P34/UTX2 P73/INT3/T0IN P35/URX2 XT1/AN10 XT2/AN11 P27/INT5/T1IN V SS 1 P26/INT5/T1IN LC87F5M64A P25/INT5/T1IN P24/INT5/T1IN/INT7 V DD 1 P23INT4/T1IN P80/AN0 P22/INT4/T1IN P81/AN1 P21/INT4/T1IN P82/AN2 P20/INT4/T1IN/INT6 P10/SO0 P07/T7O P11/SI0/SB0 P06/T6O Top view 2-34...
  • Page 44 • BLOCK DIAGRAM Interrupt control Standby control ROM correct Flash ROM X’tal SIO0 Bus interface Port 0 SIO1 B register Timer 0 Port 1 C register Timer 1 Port 2 Timer 4 Port 7 Timer 5 Port 8 Timer 6 INT0 to INT7 Timer 7 Noise filter...
  • Page 45 3. IC101 MICOM • PIN DESCRIPTION Pin Name Description Option V SS 1, V SS 2 - Power supply pin V SS 3 V DD 1, V DD 2 + Power supply pin V DD 3 Port 0 • 8-bit I/O port •...
  • Page 46 Pin Name Description Option Port 7 • 4-bit I/O port • I/O specifiable in 1-bit units P70 to P73 • Pull-up resistor can be turned on and off in 1-bit units • Shared pins P70 : INT0 input/HOLD reset input/timer 0L capture input/watchdog timer output P71 : INT1 input/HOLD reset input/timer 0H capture input P72 : INT2 input/HOLD reset input/timer 0 event input/timer 0L capture input/ high speed clock counter input...
  • Page 47 4. IC201 ADC(CS5345) • PIN CONFIGURATION 48 47 46 45 44 43 42 41 40 39 38 37 SDA/CDOUT SCL/CCLK TSTO AD0/CS AD1/CDIN AGND CS5345 RESET AGND AIN3A AIN3B PGAOUTB AIN2A PGAOUTA AIN2B AIN6B AIN1A AIN6A AIN1B MICBIAS 13 14 15 16 17 18 19 20 21 22 23 24 2-38...
  • Page 48 4. IC201 ADC(CS5345) • BLOCK DIAGRAM +3.3V to +5V +3.3V to +5V 0.1 µF 10 µF 0.1 µF 10 µF 0.1 µF 3.3 µF +1.8V PGAOUTA to +5V 0.1 µF 3.3 µF PGAOUTB MCLK SCLK Digital Audio AIN1A Left Analog Input 1 1800 pF LRCK 10 µF...
  • Page 49 • PIN DESCRIPTION Pin Name Pin Description ® Serial Control Data (Input/Output) - SDA is a data I/O in IC Mode. CDOUT is the output data line for SDA/CDOUT the control port interface in SPI Mode. SCL/CCLK Serial Control Port Clock (Input) - Serial clock for the serial control port. Addre ss Bit 0 (IC) / Co ntrol Port Chip Select (SPI) (Input) - AD0 is a chip address pin in IC Mode;...
  • Page 50 5. IC704 PWM • PIN CONFIGURATION OVERLOAD IO_VSS EPD_ENA PWM1_P SO/SDA PWM1_M SCK/SCL IO_VDD DVDD PWM_HP_L_P DVSS PWM_HP_L_M SI/I2C_AD0 IO_VSS PULSUS /CS/I2C_AD2 DVSS SPI/I2C DVDD IO_VSS PWM_HP_R_P PWM_HP_R_M XOUT IO_VDD DMIX_LRCK IO_VSS DMIX_BCK PWM_SWL_P DMIX_SDOUT PWM_SWL_M DVDD DVSS DVSS DVDD DMIX_MCLK MIC_SDIN IO_VDD...
  • Page 51 5. IC704 PWM • PIN DESCRIPTION Name Pin NO. Type Description Power and Ground PLL_AVDD Analog PLL analog power supply. Power PLL_AVSS Analog PLL analog ground. Ground PLL_DVDD PLL digital power supply. Power PLL_DVSS PLL digital ground. Ground DVDD 13, 34, 42, Power Core power supply.
  • Page 52 MIC_MCLK Main clock for external microphone input A/DC. Clock frequency can be selected between 6.144MHz, 12.288MHz, and 24.576MHz. MIC_BCK PCM bit clock input/output of external microphone. Bit clock frequency is 3.072MHz (48kHz x 64, fixed) MIC_LRCK PCM Word clock (left-right clock) input/output of external microphone.
  • Page 53 SCK/SCL SCK for SPI mode or SCL for I2C mode. Schmitt-Trigger input. SI/I2C_AD0 SI for SPI mode or Slave Address 0 for I2C mode. Schmitt-Trigger input. Internal pull-down resistor. /CS/I2C_AD2 Chip selector (CS) for SPI mode or Slave Address 2 for I2C mode.
  • Page 54 WIRING DIAGRAM CABLE1 18PIN WIRING DIAGRAM PN202 HT303/HT353 EBY38558901(#8) REV 8.2 2008.12.16 2-45 2-46...
  • Page 55 OVERALL BLOCK DIAGRAM MT1389FE/L BLOCK DIAGRAM HT303/HT353 EBY38558901(#7) REV 8.2 2008.12.16 2-47 2-48...
  • Page 56 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 57 2. MPEG CIRCUIT DIAGRAM MPEG PART HT303/HT353 EBY38558901(#1) REV 8.2 2008.12. 16 2-51 2-52...
  • Page 58 3. SERVO CIRCUIT DIAGRAM SERVO HT303/HT353 EBY38558901(#2) REV 8.2 2008.12.16 2-53 2-54...
  • Page 59 4. MICOM CIRCUIT DIAGRAM MICOM HT303/HT353 EBY38558901(#3) REV 8.2 2008.12.16 2-55 2-56...
  • Page 60 5. I/O CIRCUIT DIAGRAM HT303/HT353 EBY38558901(#4) REV 8.2 2008.12.16 2-57 2-58...
  • Page 61 6. AMP CIRCUIT DIAGRAM HT303/HT353 EBY38558901(#5) REV 8.2 2008.12.16 2-59 2-60...
  • Page 62 7. MIC CIRCUIT DIAGRAM HT303/HT353 EBY38558901(#6) REV8.2 2008.12.16 2-61 2-62...
  • Page 63 8. FRONT CIRCUIT DIAGRAM FRONT HT303 EBY39798401 REV5.1 2007. 11. 30 2-63 2-64...
  • Page 64 9. PWR KEY CIRCUIT DIAGRAM PWR KEY HT303 EBY39799101(#1) REV2.1 2007. 11. 30 2-65 2-66...
  • Page 65 10. MIC & USB & PTB CIRCUIT DIAGRAM MIC&USB&PTB HT303 EBY39799201 REV3.3 2007. 11. 30 2-67 2-68...
  • Page 66 PRINTED CIRCUIT BOARD DIAGRAMS 1. MAIN P.C. BOARD DIAGRAM ( TOP VIEW ) 2-69 2-70...
  • Page 67 MAIN P.C. BOARD DIAGRAM ( BOTTOM VIEW ) 2-71 2-72...
  • Page 68 2. SMPS P.C. BOARD DIAGRAM NOTE: Warning Parts that are shaded are critical With respect to risk of fire or electrical shock. 2-73 2-74...
  • Page 69 3. TIMER P.C BOARD DIAGRAM (HT303) TIMER P.C BOARD DIAGRAM (HT353) 4. KEY P.C. BOARD DIAGRAM (HT303) KEY P.C. BOARD DIAGRAM (HT353) 5. FRONT JACK P.C. BOARD DIAGRAM 2-75 2-76...
  • Page 70 SECTION 3. EXPLODED VIEWS NOTES) THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED • CABINET AND MAIN FRAME SECTION TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE LITERATURE. PN302 CABLE1 PN202...
  • Page 71 • DECK MECHANISM EXPLODED VIEW(DP-12TV) 015B 015A 012A...
  • Page 72 • PACKING ACCESSORY SECTION 818 PORTABLE IN CABLE 824 AM LOOP ANTENNA 808 BATTERY 811 RCA CABLE, VIDEO (1WAY) FM WIRE ANTENNA OWNER'S MANUAL REMOTE CONTROL PACKING, CASING PACKING, CASING...
  • Page 73 • SPEAKER SECTION 1. SATELLITE SPEAKER(SH33SD-S) F.L SPK F.R SPK CENTER SPK R.L SPK R.R SPK WIRE80 F.L SPK WIRE81 F.R SPK WIRE82 CENTER SPK WIRE83 R.L SPK WIRE84 R.R SPK...
  • Page 74 2. PASSIVE SUBWOOFER(SH33SD-W) WIRE90...
  • Page 76 SECTION 4. MECHANISM (DP-12TV) [CONTENTS] DECK MECHANISM PARTS LOCATIONS • Top View ............4-2 •...
  • Page 77: 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 78: 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 79: 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 80: 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 81: Deck Mechanism Exploded View (Dp-12Tv)

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

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