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LG HT904TA Service Manual

Dvd receiver system
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Internal Use Only
Website http://biz.lgservice.com
DVD RECEIVER SySTEM
SERVICE MANUAL
MODEL: HT904TA
(HT904TA, SH94TA-F/S/C/W)
P/NO : AFN73078818
JUNE, 2009

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  • Page 1 Internal Use Only Website http://biz.lgservice.com DVD RECEIVER SySTEM SERVICE MANUAL MODEL: HT904TA (HT904TA, SH94TA-F/S/C/W) P/NO : AFN73078818 JUNE, 2009...

  • 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 OPT 6 Press number 0~9, Press character OPT 7 A~F (1~6 for a while) OPT 8...

  • Page 7: 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) HT904 : “HT904_0810010 .HEX” 2 .

  • Page 8: Specifications

    SPECIFICATIONS GENERAL Power supply Refer to main label . Power consumption Refer to main label . Net weight 3 .9 kg External dimensions (w x H x D) 430 x 73 x 327 mm Operating conditions Temperature 5°C to 35°C, Operation status: Horizontal Operating humidity 5% to 85% Laser...
  • Page 9 SPEAKERS (SH94PA) Front Speaker Rear Speaker SH94PA-F SH94PA-S Type 2 way 3 Speaker 1 way 1 Speaker 4 Ω 4 Ω Impedance Rated Input Power 155 w 155 w Max . Input Power 310 w 310 w Net Dimensions (w x H x D) 290 x 1150 x 290mm 96 x 240 x 108 mm Net weight...

  • Page 10: Section 2. Electrical Part

    SECTION 2. ELECTRICAL PART TROUBLESHOOTING GUIDE . Power Supply Circuit Insert power cord. Check power plug and power Is the Digitron on correctly? supply circuit. Turn power on. Check power supply circuit. Is power on? Check laser circuit. Does initial read work? Check focus circuit.
  • Page 11 2. Front circuit (/2) Power on. Check if CN301 (or CN304) Reconnect it. Red LED turn off? and PN301 are ok? (*1) Check if the front Is the Digitron on Refer to SMPS part. power is ok?(*2) correctly? Check if all buttons are ok? Check if the remote control is ok?
  • Page 12 2. Front circuit (2/2) Check if the power part of the Refer to power(SMPS). front is ok? Check if R345~R350, R149 are Replace R345~R350, R149. 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 CN301 (or CN304)
  • Page 13 . I-pod circuit I-pod Insert Check CN3C1 & FFC Refer to Front Circuit. Does it detect ipod? Cable connection. (*3) Reconnect or Resoldering. Check Connector Status. Does it play? Check CN301 & FFC Does it output Cable Connection. Video/Audio? Check IC3C4. Does it change? *3: CN3C1 Pins.
  • Page 14 . 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 15 . 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? (-34V, -28V, -32V, ±12V, Check the POWER PART. 3.5V, 5.6VA, 5V, 7V). Are 3.3V and 5V DC outputs normal on main Check the regulators or diode.
  • Page 16 Power On. Check connection lines Flash between FLASH & MT1389MH Memory operates Show LOGO? and the FLASH access time properly? whether is suitable or not. Check connection lines SDRAM between SDRAM(IC503) & works properly? MT1389MH and the SDRAM is damaged. MT1389MH Check the related circuit of VIDEO outputs...
  • Page 17 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 18 Check the laser power circuit Laser DVDLD or on MT1389MH 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 19 Proper Check connections between signals on A, B, C, Focus on ok? MT1389MH and pick-up head. D of MT1389MH. Proper Check the related circuit on CD_DVDCT signal on MT1389MH CD_DVDCT. MT1389MH. Check CD_DVDCT connection between AM5890 and MT1389MH. Proper Check the related circuit on CD_DVDCT signal on Track On OK? MT1389MH.
  • Page 20 Check connection between Normal Audio PWM IC IC601 BCK, LRCK, ADATA0, output when disc received correct data ADATA1, ADATA2(Pins19, 20, playback? stream? 23, 24, 25). Check the related circuit of Normal PWM.(Check Audio out PWM IC out?(IC601). Pins 54, 55, 58, 59, 61, 62, 67, 68, 70, 71, 74, 75) Check Digital Amp circuit TEST END.
  • Page 21 . AMP Protection "PROTECTION" appears on the FLD. After unplug power cord, connect again. Power on. "PROTECTION" appears continuously on the FLD. Is the IC101 pin53 Replace IC101. "LOW" signal(0V)? Is the Q703, Q704 and Replace the Q703, Q704 and Q705. Q705 normal? Replace TI AMP IC(IC0, IC02, IC0, IC0) 2-2...
  • Page 22 . AUDIO µ-COM Circuit(DVD & AMP) Power On. Does Does AV1, TV AUDIO, AV1 OPT and CD/DVD appear at FM 87.5 appear FLD? at 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 23: Details And Waveforms On System Test And Debugging

    DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING . SYSTEM 2MHz CLOCK,RESET,FLASH R/W SIGNAL ) MTMH main clock is at 2MHz(X00) FIG - 2) MTMH reset is high active. Power Cord in P_CTL DVD_RST RESET_IN IC101 FIG -2 IC501 IC501 2-...
  • Page 24 ) Flash R/W enable signal during download(Downloading) SF_DI SF_DO FIG - 2. SDRAM CLOCK ) MTMH main clock is at 2MHz(X00) DCLK = 93MHz, Vp-p=2.2, Vmax=2.7V SDCLK FIG 2- 2-...
  • Page 25 . TRAY OPEN/CLOSE SIGNAL ) Tray open/close waveform 2) Tray close waveform OPENSW OPENSW CLOSESW CLOSESW OPEN OPEN CLOSE CLOSE FIG - FIG -2 ) Tray open waveform OPENSW CLOSESW OPEN CLOSE FIG - 2-...
  • Page 26 . SLED CONTROL RELATED SIGNAL (NO DISC CONDITION) M-STBY FIG - 2-...
  • Page 27 . LENS CONTROL RELATED SIGNAL(NO DISC CONDITION) FIG - . LASER POWER CONTROL RELATED SIGNAL(NO DISC CONDITION) IC501 MDI1 DVDLD CDLD FIG - 2-...
  • Page 28 . DISC TYPE JUDGEMENT WAVEFORMS PU_DET FIG - (DVD) 2 : This signal can see using special debug program IC501 PU_DET FIG -2 (DVD) 2-...
  • Page 29 PU_DET FIG - (CD) 2 : This signal can see using special debug program IC501 PU_DET FIG - (CD) 2-20...
  • Page 30 . FOCUS ON WAVEFORMS 2 : This signal can see using special debug program IC501 PU_DET FIG - (DVD) PU_DET FIG -2 (CD) 2-2...
  • Page 31 . SPINDLE CONTROL WAVEFORMS (NO DISC CONDITION) SPIND FIG - 2-22...
  • Page 32 0. TRACKING CONTROL RELATED SIGNAL(System checking) 2 : This signal can see using special debug program IC501 PU_DET FIG 0-(DVD) PU_DET FIG 0-2(CD) 2-2...
  • Page 33 . MTMH VIDEO OUTPUT WAVEFORMS ) Full colorbar signal(COMPOSIT) CVBS IC501 FIG - 2) Y IC501 FIG -2 2. AUDIO OUTPUT FROM PWM IC ) Audio related Signal ADATA0 ASDATA3 IC501 LRCK FIG 2- 2-2...
  • Page 34 . DVD & AMP WAVEFORMS MTMH • FL+ : R705 → TP601 FL- : R710 → TP602 • RL+ : R718 → TP603 RL- : R722 → TP604 • WF- : R745 → TP605 WF+ : R748 → TP606 2-2...
  • Page 35 • C+: R731 → TP609 C- : R736 → TP610 • FR+ : R775 → TP611 FR- : R780 → TP612 • RR+ : R788 → TP607 RR- : R792 → TP608 2-2...

  • Page 36: Wiring Diagram

    WIRING DIAGRAM A/V IN/OUT SCART HDMI HDMI HDMI iPod iPod SPK Terminal CN603 I/o B’d CABle 4 (20 PIN, FFC) 2 PIN CN401 9 PIN MAIN PCB SMPS PCB CN103 CN204 13 PIN 11 PIN CABle 3 CABle 5 (13 PIN, FFC) (11 PIN, FFC) 13 PIN 11 PIN...

  • Page 37: Overall Block Diagram

    oveRAll BloCK DIAGRAM SPDIF oPTICAl D+, D- X100 MAIN BoARD AMP BoARD TAS5352_PDN 9.8304 MHz 27 MHz X601 TAS5352_SD HDMI TMDS RX SPDIF HDMI HDMI 12.288 MHz SPDIF SPDIF IC101 IC101 12bit IC601 vIDeo AUDIo IC601 HDMI AUDIo MClK,BClK TAS5352 9830_DAT TAS5352 Fl+/-, FR+/-...

  • Page 38: Circuit Diagrams

    FROM THE ACTUAL CIRCUIT USED. THIS WAY, MODIFIED OR ALTERED WITHOUT PERMISSION IMPLEMENTATION OF THE LATEST SAFETY AND 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. MPeG CIRCUIT DIAGRAM MPEG HT964/HT904 25 32 EBY57656101_#1 REV9.3 WAVEFORM 2009. 02. 19 2-33 2-34...
  • Page 40 3. SeRvo CIRCUIT DIAGRAM SERVO HT964/HT904 EBY57656101_#2 REV9.3 WAVEFORM 2009. 02. 19 2-35 2-36...
  • Page 41 4. I/o CIRCUIT DIAGRAM WIRELESS PART HT964/HT904 EBY57656101_#3 REV9.3 2009. 02. 19 2-37 2-38...
  • Page 42 5. MICoM CIRCUIT DIAGRAM MICOM HT964/HT904 EBY57656101_#4 REV9.3 WAVEFORM 2009. 02. 19 2-39 2-40...
  • Page 43 6. HDMI RX CIRCUIT DIAGRAM HDMI RX HT964/HT904 EBY57656101_#5 REV9.3 2009. 02. 19 2-41 2-42...
  • Page 44 7. HDMI TX CIRCUIT DIAGRAM HDMI TX HT964/HT904 EBY57656101_#6 REV9.3 2009. 02. 19 2-43 2-44...
  • Page 45 8. IPoD ReAR CIRCUIT DIAGRAM IPOD REAR HT964/HT904 EBY57656101_#7 REV9.3 2009. 02. 19 2-45 2-46...
  • Page 46 9. AMP CIRCUIT DIAGRAM WAVEFORM HT964/HT904 EBY57656101_#8 REV9.3 2009. 02. 19 2-47 2-48...
  • Page 47 10. DSP & PWM CIRCUIT DIAGRAM DSP&PWM HT964/HT904 EBY57656101_#9 REV9.3 2009. 02. 19 2-49 2-50...
  • Page 48 11. I/o JACK CIRCUIT DIAGRAM I/O JACK HT964/HT904 EBY57025201 REV7.3 2009. 02. 19 2-51 2-52...
  • Page 49 12. IPoD DoCKING CIRCUIT DIAGRAM (oPTIoNAl PART) IPOD DOCKING HT904 EBY57025401 REV6.1 2009. 02. 24 2-53 2-54...
  • Page 50 13. MIC & USB & PTB CIRCUIT DIAGRAM MIC&USB&PTB HT904 EBY57025601 REV7.2 2009. 02. 24 2-55 2-56...
  • Page 51 14. FRoNT CIRCUIT DIAGRAM TIMeR PART PWR KeY PART PWR KEY HT904 EBY57605101 REV3.1 2009. 02. 24 TACT KeY PART FRONT TACT KEY HT904 HT904 EAX57605601 REV6.2 EBY57605201 REV4.1 2009. 02. 24 2009. 02. 24 2-57 2-58...

  • Page 52: Circuit Voltage Chart

    CIRCUIT volTAGe CHART 1. ICs on BoARD MAIN IC255 (IPoD, MM1225XFBe) Pin No. SPeC DvD PB (v) Pin No. SPeC DvD PB (v) Pin No. SPeC DvD PB (v) Pin No. SPeC DvD PB (v) IC100 (eePRoM, M24C16-WMN6TP) Pin No. SPeC volT 3.24...
  • Page 53 2. CAPACIToRS oN BoARD value (uF) voltage_Spec positive (+) negative (-) voltage value (uF) voltage_Spec positive (+) negative (-) voltage value (uF) voltage_Spec positive (+) negative (-) voltage C101 10uF 4.94 0.00 4.94 C418 47uF 6.30 3.19 3.04 0.15 C878 10uF 1.78 0.00...
  • Page 54 PRINTeD CIRCUIT BoARD DIAGRAMS 1. MAIN P.C. BoARD DIAGRAM ( ToP vIeW ) 2-63 2-64...
  • Page 55 MAIN P.C. BoARD DIAGRAM ( BoTToM vIeW ) 2-65 2-66...
  • Page 56 2. SMPS P.C. BoARD DIAGRAM ( ToP vIeW ) SMPS P.C. BoARD DIAGRAM ( BoTToM vIeW ) NoTe: Warning Parts that are shaded are critical With NoTe: Warning respect to risk of fire or electrical shock. Parts that are shaded are critical With respect to risk of fire or electrical shock.
  • Page 57 3. I-PoD DoCKING P.C.BoARD DIAGRAM 4. MIC & USB & PTB P.C.BoARD DIAGRAM ( ToP vIeW ) ( BoTToM vIeW ) 5. FRoNT P.C. BoARD DIAGRAM HT904 POWER KEY EAX57605901 HT904 TACT KEY EAX57606001 2-69 2-70...

  • Page 58: 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. PN301 CABLE1 A43A PN106 CABLE4 PN01 TACT MAIN KEY CABLE3 A43B SMPS CABLE2...
  • Page 59 • DECK MEChANISM EXPLODED VIEW (DP-15A) 015B 015A 012A...

  • Page 60: Packing Accessory Section

    • Packing accessory section 808 BATTERY 824 AM LOOP ANTENNA 811 RCA CABLE VIDEO(1WAY) 818 PORTABLE IN CABLE 825 FM WIRE ANTENNA 900 REMOTE CONTROL 801 OWNER'S MANUAL 804 BAG 803 PACKING, CASING 803 PACKING, CASING 802 BOX sPeaker Wire WIRE80 FRONT LEFT 3M WIRE81 FRONT RIGHT 3M WIRE70 CENTER 3M WIRE90 SUBWOOFER 3M WIRE60 REAR LEFT 10M WIRE61 REAR RIGHT 10M...

  • Page 61: Speaker Section

    • sPeaker section (sH94ta) 1. center sPeaker (sH94ta-c) A700 754B 754A...
  • Page 62 2. Front/rear sPeaker (sH94ta-F/s) A800 : FRONT SPK A810 : REAR SPK A800F : FRONT TOP A800R : REAR TOP A800B 853F : FRONT 853R : REAR 853F : FRONT 853R : REAR 858A 858B...
  • Page 64 3. PassiVe sUBWooFer (sH94ta-W) A900 954B 954A...
  • Page 65 3-10...
  • Page 66 SECTION 4 . MECHANISM (DP-15A) [CONTENTS] DECK MECHANISM PARTS LOCATIONS • Top View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2 •...

  • Page 67: 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 4 Screws, 1 Connector 1 Locking Tabs 1, 2, 6, 8 Gear Middle • Top View(without Tray Disc) 1, 2, 6, 8, 9 Gear Rack 1 Screw 1, 2, 7 Rubber Rear...

  • Page 68: 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 69: 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 . Rubber Rear (Fig . 4-3) 1) Release 4 Screw(S2). 2) Disconnect the FFC Connector(C1) 3-1 . Gear Feed 3-2 .

  • Page 70: 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 . (C) Fig . 4-4 5 . Frame Assembly Up/Down (Fig . 4-4) 8 .

  • Page 71: Deck Mechanism Exploded View (Dp-15A)

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

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