LG SH72TZ-C Service Manual
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LG SH72TZ-C Service Manual

Dvd/cd receiver
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Internal Use Only
Website http://biz.lgservice.com
DVD/CD RECEIVER
SERVICE MANUAL
MODELS: HT762TZ / HT762TZ-A2
SH72TZ-C, SH72TZ-S, SH72TZ-W
OCTOBER, 2007
P/NO : AFN35120318

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  • Page 1 Internal Use Only Website http://biz.lgservice.com DVD/CD RECEIVER SERVICE MANUAL MODELS: HT762TZ / HT762TZ-A2 SH72TZ-C, SH72TZ-S, SH72TZ-W OCTOBER, 2007 P/NO : AFN35120318...

  • Page 2: Table Of Contents

    ........6-1 Copyright © 2007 LG Electronics. Inc. All right reserved.

  • Page 3: Section 1. General

    (Do not use any other liquid cleaners, because they will damage the lens.) Take care not to use too much of this alcohol on the swab, and do not allow the alcohol to get inside the pick-up. LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 4 7) The laser beam from the pick-up should NEVER be directly facing the eyes or bare skin. Armband Resistor (1 Mohm) Resistor Conductive (1 Mohm) Sheet Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 5: Esd Precautions

    THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE LITERATURE. LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 6 OPT D OPT E OPT F OPT G Press pause key once Change will be applied when power OFF-->ON. Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 7: Service Information For Eeprom

    FLD ‘write ok’ or ‘up ok’ Remote control ‘2’ + Front ‘STOP’ push same timing FLD display E2P CLR or EP CLR Auto power off LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 8: Specifications

    430 x 107 x 83 mm 165 x 422 x 415 mm (W x H x D) Net Weight 4.11 kg 1.12 kg 7.6 kg Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 9 LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 10: Section 2. Audio Part

    Check laser circuit. Check focus circuit. Check disc. Does it play? Check tracking servo circuit. Does it output audio? Check audio circuit. Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 11 *2 : PN603 Pins. PIN1 : -35 VKK PIN2 : -30 FL+ PIN3 : -33 FL- PIN7 : +5V PIN13 : +5VA LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 12 Refer to micom circuit. PN301 pin11 is ok? Check if RC2 voltage is ok(5V)? Check rm circuit Resolder or replace RC2. Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 13 LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 14: Wiring Diagram

    6630XE00111 CABLE2 EAD35632101 11PIN CABLE1 EAD35201101 PN202 6630R-FB05K 561-711C PN302 KEY PCB VOLUME PN301 FRONT PCB 6630R-FB05R JK2D3 JK2D1JK2D2 JK2D4 3PIN Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 15: Block Diagram

    BLOCK DIAGRAM X601 IC508 TAS5152 IC601 TAS5152 TAS5152 TAS5152 ES7108 TU101 IC501 IC204 IC203 AK5358 NJM4580 OP AMP IP9009A LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 16: Circuit Diagrams

    2007. 07. 04 NOTE) Parts that are shaded are critical NOTE) With respect to risk of fire or NOTE) electricial shock. 2-10 Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 17 DVD & AMP CIRCUIT DIAGRAMS 2. MPEG CIRCUIT DIAGRAM 2007. 08. 20 2-11 2-12 LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 18 3. POWER INTERFACE CIRCUIT DIAGRAM 2007. 08. 20 2-13 2-14 Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 19 4. I/O CIRCUIT DIAGRAM 2007. 08. 20 2-15 2-16 LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 20 5. SERVO CIRCUIT DIAGRAM 2007. 08. 20 2-17 2-18 Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 21 6. HDMI CIRCUIT DIAGRAM 2007. 08. 20 2-19 2-20 LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 22 7. POWER KEY CIRCUIT DIAGRAM 2007. 07. 04 2-21 2-22 Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 23 8. TIMER CIRCUIT DIAGRAM 2007. 07. 04 2-23 2-24 LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 24 9. MIC & USB & PTB CIRCUIT DIAGRAM EBY38928002 2007. 08. 20 2-25 2-26 Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 25 PRINTED CIRCUIT BOARD DIAGRAMS 1. MAIN P.C. BOARD (TOP VIEW) 2-27 2-28 LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 26 MAIN P.C. BOARD (BOTTOM VIEW) 2-29 2-30 Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 27 Warning NOTES) Parts that are shaded are critical NOTES) with respect to risk of fire or NOTES) electricial shock. 2-31 2-32 LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 28 3. KEY P.C. BOARD 5. MIC & USB P.C. BOARD EAX38921302 EAX38921302 EAX38921302 4. TIMER P.C. BOARD 2-33 2-34 Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 29 LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 30: Section 3. Dvd & Amp Part

    Replace IC101. "LOW" signal(0V)? Replace the Q703, Q704 and Q705. Is the Q703, Q704 and Q705 normal? Replace TI AMP IC(IC701~704). Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 31 2. System operation Routine Loop 1. Stop Playback & Open Tray 2. Display tray open message & LOGO Receive CLOSE Key? LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 32 2. Check system reset circuit. Update 3. Check FLASH R/W enable signal PRD, FLASH RWR. successfully? 4. Check FLASH Memory related circuit. Replace FLASH Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 33 IC501 Pins133, 134, 137, 138, 139, 140 properly? Normal OPEN_SW, CLOSE_SW signal? Check the Tray control IO pins on ES8381. Check the Tray control SERVO circuit IC401. LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 34 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. Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 35 ES8381 RF signal. Check the RF connection between IP9009 and ES8381. Proper SPINDLE signal on ES8381. ES8381 SPNP SPNN output properly? LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 36 Proper Check the TRACK connection TRACK signal on ES8381 and motor driver. on ES8381 TR+ & TR- output properly? Disc Playback? Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 37 PWM.(Check Audio out Pins54, 55, 58, 59, 61, 62, 67, 68, 70, 71, 74, 75 Check Digital Amp circuit (IC701, IC702, IC703, IC704) LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 38 Check if IC101 Pin15, 16, Check 3.3V line. 47 are high(5V). Check if IC101 Pin1 Check Power section is high. Circuit. Replace IC101. Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 39 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 LGE Internal Use Only 3-10 Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 40 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 Copyright © 2007 LG Electronics. Inc. All right reserved. 3-11 LGE Internal Use Only Only for training and service purposes...
  • Page 41 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 LGE Internal Use Only 3-12 Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 42 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 Copyright © 2007 LG Electronics. Inc. All right reserved. 3-13 LGE Internal Use Only Only for training and service purposes...
  • Page 43 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 LGE Internal Use Only 3-14 Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 44 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) Copyright © 2007 LG Electronics. Inc. All right reserved. 3-15 LGE Internal Use Only Only for training and service purposes...
  • Page 45 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) LGE Internal Use Only 3-16 Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 46 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) Copyright © 2007 LG Electronics. Inc. All right reserved. 3-17 LGE Internal Use Only Only for training and service purposes...
  • Page 47 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) LGE Internal Use Only 3-18 Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 48 TR-(IC401 PIN 12) TR+(IC401 PIN 11) FIG 10-2(CD) 11. ES8381 VIDEO OUTPUT WAVEFORMS 1) Full colorbar signal(COMPOSIT) (IC501 PIN 134) FIG 11-1 Copyright © 2007 LG Electronics. Inc. All right reserved. 3-19 LGE Internal Use Only Only for training and service purposes...
  • Page 49 (IC501 PIN 140) FIG 11-2 12. AUDIO OUTPUT FROM PWM IC 1) Audio L/R (IC602 PIN 1, 7) FIG 12-1 LGE Internal Use Only 3-20 Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 50 2) Audio related Signal ASDATA3 ADATA0(IC501 PIN 154) BCK(IC501 PIN 155) LRCK(IC501 PIN 156) FIG 12-2 Copyright © 2007 LG Electronics. Inc. All right reserved. 3-21 LGE Internal Use Only Only for training and service purposes...
  • Page 51 • R610 → TP601 R613 TP604 R611 TP602 • R614 → TP605 • R616 → TP607 R615 TP606 R617 TP608 LGE Internal Use Only 3-22 Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 52: Amp Circuit Diagrams

    AMP CIRCUIT DIAGRAMS 1. AMP CIRCUIT DIAGRAM 2007. 07. 04 3-23 3-24 Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 53 2. DSP CIRCUIT DIAGRAM 2007. 07. 04 3-25 3-26 LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 54 3. MICOM CIRCUIT DIAGRAM 2007. 07. 04 3-27 3-28 Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 55 PRINTED CIRCUIT BOARD DIAGRAMS 1. AMP P.C. BOARD (TOP VIEW) 3-29 3-30 LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 56 AMP P.C. BOARD (BOTTOM VIEW) 3-31 3-32 Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 57 LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 58: Section 4. Exploded Views

    SECTION 4. EXPLODED VIEWS • CABINET AND MAIN FRAME SECTION CABLE3 CABLE4 CABLE2 CABLE1 280A Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 59 • DECK MECHANISM EXPLODED VIEW(DP-12A) 015B 015A 012A LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 60 RCA CABLE 1.5M 1P(YELLOW) 824 AM LOOP ANTENNA BATTERY 825 FM WIRE ANTENNA REMOTE CONTROL OWNER'S MANUAL ASSEMBLY PACKING, CASING PACKING, CASING Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 61 LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 62: Section 5. Speaker Part

    SECTION 5. SPEAKER PART • CENTER SPEAKER(SH72TZ-C) 759A 759B WIRE70 Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 63 4. LHS-96IA • FRONT/REAR SPEAKER(SH72TZ-S) WIRE80 : F.R WIRE81 : F.L WIRE60 : R.R WIRE61 : R.L LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 64 2. LHS-76IB • PASSIVE SUBWOOFER(SH72TZ-W) A90B A90A 957A 952B 952A WIRE90 Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 65 LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...

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Ht762tz-a2Ht762tzSh72tz-sSh72tz-w

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