LG LH-T552SB Service Manual Download Page 10 | Manualshive

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2-4

2-5

WIRING DIAGRAM

WIRELESS

OPTICAL

IN

SCART

JACK

OPTION

SW

AV1,2

COMPONENT

MONITOR OUT

S-VIDEO OUT

TUNER

SPEAKER TERMINAL

MAIN PCB

AMP PCB

SMPS PCB

MD

FRONT

PCB

FRONT

PCB

MIC&USB PCB

VFD

H/P JACK

USB JACK

MIC

JACK

MIC

JACK

CN001

PN005

CN350

PN801

6PIN

5PIN

23PIN

11PIN

24PIN

23PIN

14PIN

14PIN

30PIN

PN103

PN104

PN001

PN002

PN902

PN303

PDM01

PDM03

PN105

PN302

NOTES) Warning

NOTES)

Parts that are shaded are critical

NOTES)

With respect to risk of fire or

NOTES)

electricial shock.

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Summary of Contents for LH-T552SB

Page 1: ...DVD CD RECEIVER SERVICE MANUAL MODEL LH T552SB LHS 55SBC LHS 55SBS LHS 55SBW MODEL LH T552SB LHS 55SBC LHS 55SBS LHS 55SBW SERVICE MANUAL ...

Page 2: ... PART AUDIO TROUBLESHOOTING GUIDE 2 1 WIRING DIAGRAM 2 4 BLOCK DIAGRAM 2 6 SCHEMATIC DIAGRAMS 2 8 PRINTED CIRCUIT DIARGAMS 2 22 SECTION 3 DVD AMP PART ELECTRICAL TROUBLESHOOTING GUIDE 3 1 DVD PART SCHEMATIC DIAGRAMS 3 22 SECTION 4 EXPLODED VIEWS 4 1 SECTION 5 SPEAKER PART 5 1 SECTION 6 REPLACEMENT PARTS LIST 6 1 ...

Page 3: ...ser 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 the...

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: ...arges 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 comparable...

Page 6: ... sync RCA jack x 1 Pb Pr 0 7 V p p 75 Ω RCA jack x 1 TUNER FM Tuning Range 87 5 108 0 MHz or 65 0 74 0 MHz 87 5 108 0 MHz Intermediate Frequency 10 7 MHz Signal to Noise Ratio 60 dB Mono Frequency Response 140 10 000 Hz AM MW Tuning Range 522 1 620 kHz or 520 1 720 kHz Intermediate Frequency 450 kHz AMPLIFIER Stereo mode 70W 70W 8Ω at 1 kHz THD 10 Surround mode Front 70W 70W THD 10 Center 70W Surr...

Page 7: ...2 1 SECTION 2 AUDIO PART AUDIO TROUBLESHOOTING GUIDE 1 POWER SUPPLY CIRCUIT ...

Page 8: ...2 2 2 FRONT CIRCUIT 1 2 PIN3 PIN4 PIN9 27 5 FL 32 4 VKK 23 7 FL 5 0 CN902 CN902 ...

Page 9: ...2 3 3 FRONT CIRCUIT 2 2 ...

Page 10: ... PCB SMPS PCB MD FRONT PCB FRONT PCB MIC USB PCB VFD H P JACK USB JACK MIC JACK MIC JACK CN001 PN005 CN350 PN801 6PIN 5PIN 23PIN 11PIN 24PIN 23PIN 14PIN 14PIN 30PIN PN103 PN104 PN001 PN002 PN902 PN303 PDM01 PDM03 PN105 PN302 NOTES Warning NOTES Parts that are shaded are critical NOTES With respect to risk of fire or NOTES electricial shock ...

Page 11: ...R 8 16 V SW1 SW2 MUTE1 A Pb R Pr R CTL A B B VIDEO SW A Tuner L R AV1 L R AV2 L R SCART L R AV1 CVBS AV2 CVBS Monitor out SCART CVBS out C Y SCART ID SCART FB RST AD AD DATA AD BCK AD LRCK A SPDIF 12 288MHz LRCK BCK ADAT 0 1 2 3 FL R RL R C SW MUTE TR Mute RST AD A Mixing ALRCK ABCK MCLK AMDAT SPDIF 8406_SDI 8406_SDO 8406_CLK 8406_CE 8406_RST 8406_INT H P Y G Y Y Y C DVD CVBS CVBS A T_CE T_DO T_DI...

Page 12: ...EMATIC DIAGRAM_1 NOTES Symbol denotes AC ground NOTES Symbol denotes DC chassis ground NOTE Warning NOTE Parts that are shaded are critical NOTE With respect to risk of fire or NOTE electricial shock A B C D E F G H I J K L M N O P Q R S T ...

Page 13: ...2 10 2 11 2 POWER SCHEMATIC DIAGRAM_2 A B C D E F G H I J K L M N O P Q R S T ...

Page 14: ...2 12 2 13 3 MICOM SCHEMATIC DIAGRAM A B C D E F G H I J K L M N O P Q R S T ...

Page 15: ...2 14 2 15 4 FRONT SCHEMATIC DIAGRAM A B C D E F G H I J K L M N O P Q R S T ...

Page 16: ...2 16 2 17 5 DSP AMP SCHEMATIC DIAGRAM A B C D E F G H I J K L M N O P Q R S T ...

Page 17: ...2 18 2 19 6 I O SCHEMATIC DIAGRAM A B C D E F G H I J K L M N O P Q R S T ...

Page 18: ...2 20 2 21 7 MAIN MIC SCHEMATIC DIAGRAM A B C D E F G H I J K L M N O P Q R S T ...

Page 19: ...2 22 2 23 PRINTED CIRCUIT BOARD DIAGRAMS 1 MAIN DVD P C BOARD DIAGRAM TOP VIEW ...

Page 20: ...2 24 2 25 2 MAIN DVD P C BOARD DIAGRAM BOTTOM VIEW ...

Page 21: ...2 26 2 27 3 FRONT MIC P C BOARD 6870R7507AB ...

Page 22: ...at are shaded are critical NOTES With respect to risk of fire or NOTES electricial shock 5 JACK P C BOARD 5 TOOL LOCATION GUIDE NOTES Warning NOTES Parts that are shaded are critical NOTES With respect to risk of fire or NOTES electricial shock 7 TOOL TOP VIEW BOTTOM VIEW ...

Page 23: ...2 30 2 31 6 AMP P C BOARD TOP VIEW BOTTOM VIEW ...

Page 24: ...ion Recieve OPEN CLOSE Key Receive CLOSE Key 1 Stop Playback Open Tray 2 Display tray open message LOGO 1 Execute Pressed Key IR Key 2 Systemoperati on Routi ne Loop 1 Judge whether have disc and disc type 2 Jump to related disc reading procedure SLED at Inner Side 1 8082 initializes SERVO DSP RISC registers 2 Write RISC code to SDRAM 3 Reset RISC SECTION 3 DVD AMP PART ...

Page 25: ...system clock 2 Check systemreset circuit 3 Check FLASH R Wenable signal PRD RWR 4 Check FLASH Memory related circuit Check the AC Vol tage Power PCBA 110V or 220V Switch on the Power PCBA Are 3 3V and 5V DC outputs normal on main PCBA Update FLASH successfully Replace FLASH A Is the DC Voltage outputs OK 44V 22V 26 5V 12V 5 6V 3 3V 5V 7V 8V ...

Page 26: ...3 3 A 115 ...

Page 27: ...3 4 B 1 2 ...

Page 28: ...3 5 C ES6698 ES6698 ES6698 ...

Page 29: ...3 6 D ...

Page 30: ...ection between IC300 ABCK ALRCK ASDAT Check the related circuit of PWM Check Audio out Pins52 54 55 59 62 68 Normal PWM IC out IC301 PWM IC received correct data stream Check Digital Amp circuit IC701 IC702 IC703 IC704 ...

Page 31: ... it appear DVD Error at FLD Refer to SMPS Refer to oscillator Circuit Check IC101 Reset Waveform Check 3 3V line Check Power section Circuit NO Check power part of Main B D Check oscillator of X101 Check if IC101 Pin80 is high Check if IC101 Pin32 51 80 are high 5V Check if IC101 Pin96 is high Replace IC101 NO NO Check if DVD an Audio Micom Insert is OK Check Power YES Check DVD Module YES Check S...

Page 32: ... DEBUGGING 1 SYSTEM 27MHz CLOCK RESET FLASH R W SIGNAL 1 ES6698FD main clock is at 27MHz X501 3 8V 27MHz FIG 1 1 2 ES6698FD reset is high active PWR_CTL SYSTEM µ COM IC501 PIN83 5 2VA Power Cord in M_RESET IC501 PIN 207 URST IC501 PIN 188 FIG 1 2 ...

Page 33: ... 10 2 SDRAM CLOCK 1 ES6698FD main clock is at 27MHz X501 IC503 PIN 38 DCLK 93MHz Vp p 2 2 Vmax 2 7V FIG 2 1 4 Flash R W enable signal during download Downloading FRD IC500 PIN 28 FWR IC500 PIN 11 FIG 1 4 ...

Page 34: ...LOSE SIGNAL 1 Tray open close waveform OPEN PDM03 PIN7 CLOSE PDM03 PIN8 TROPEN IC402 PIN 4 TRCLOSE IC402 PIN 5 FIG 3 1 2 Tray close waveform OPEN PDM03 PIN7 CLOSE PDM03 PIN8 TROPEN IC402 PIN 4 TRCLOSE IC402 PIN 5 FIG 3 2 ...

Page 35: ...DISC CONDITION FMSO 2 0V 1 4V 1 0V IC501 PIN 19 STBY 5V IC401 PIN 50 SL 4 7V 3 6V 1 9V IC404 PIN 12 SL 5 3V 3 7V 2 5V IC404 PIN 11 FIG 4 1 3 Tray open waveform OPEN PDM03 PIN7 CLOSE PDM03 PIN8 TROPEN IC402 PIN 4 TRCLOSE IC402 PIN 5 FIG 3 3 ...

Page 36: ...ION FOSO 1 5V 1 4V 1 3V IC501 PIN 12 F 4 0V 3 6V 3 2V IC404 PIN 14 F 4 0V 3 6V 3 2V IC404 PIN 13 FIG 5 1 6 LASER POWER CONTROL RELATED SIGNAL NO DISC CONDITION MDI1 0V 180mV IC401 PIN 26 LD01 5 0V 3 5V IC401 PIN 20 LD02 5 0V 3 6V IC401 PIN 21 FIG 6 1 ...

Page 37: ...3 14 F IC404 PIN 14 FE IC401 PIN 40 RFL IC401 PIN 19 FIG 7 2 DVD 7 DISC TYPE JUDGEMENT WAVEFORMS F IC404 PIN 14 FE IC401 PIN 40 RFL IC401 PIN 19 FIG 7 1 DVD ...

Page 38: ...3 15 F IC404 PIN 14 FE IC401 PIN 40 RFL IC401 PIN 19 FIG 7 3 CD F IC404 PIN 14 FE IC401 PIN 40 RFL IC401 PIN 19 FIG 7 4 CD ...

Page 39: ...3 16 FE IC401 PIN 40 FOSO IC501 PIN12 F IC404 PIN 14 F IC404 PIN 13 FIG 8 2 CD 8 FOCUS ON WAVEFORMS FE IC401 PIN 40 FOSO IC501 PIN12 F IC404 PIN 14 F IC404 PIN 13 FIG 8 1 DVD ...

Page 40: ... NO DISC CONDITION DMSO 1 4V 1 8V IC501 PIN 18 SP 3 6V 2 4V IC404 PIN 18 SP 3 6V 4 8V IC404 PIN 17 FIG 9 1 10 TRACKING CONTROL RELATED SIGNAL System checking TE IC401 PIN 39 TRSO IC501 PIN 13 T IC404 PIN 16 T IC404 PIN 15 FIG 10 1 DVD ...

Page 41: ...3 18 11 RF WAVEFORM RFOP 2 3V 1 1V IC401 PIN 55 RFON 0 8V 2 0V IC401 PIN 57 FIG 11 1 TE IC401 PIN 39 TRSO IC501 PIN 13 T IC404 PIN 16 T IC404 PIN 15 FIG 10 2 CD ...

Page 42: ...3 19 12 ES6698FD VIDEO OUTPUT WAVEFORMS 1 Full colorbar signal COMPOSIT IC501 PIN 110 FIG 12 1 2 Y IC501 PIN 113 FIG 12 2 ...

Page 43: ...3 20 1 Audio L R FIG 13 1 13 AUDIO OUTPUT FROM PWM IC IC301 PIN 68 49 2 Audio related Signal ASDAT0 IC501 PIN 117 ABCK IC501 PIN 123 ALRCK IC501 PIN 116 ASDATA3 FIG 13 2 ...

Page 44: ...3 21 1 R310 TP301 or R311 TP302 2 R320 TP311 or R321 TP312 3 R312 TP303 or R313 TP304 4 R318 TP307 or R319 TP308 5 R314 TP305 or R315 TP304 6 R318 TP309 or R319 TP310 14 DVD AMP WAVEFORMS ...

Page 45: ......

Page 46: ...A B C D E F G H I J K L M N O P Q R S T 3 22 3 23 DVD PART SCHEMATIC DIAGRAMS 1 DVD MPEG DSP SCHEMATIC DIAGRAM ...

Page 47: ...A B C D E F G H I J K L M N O P Q R S T 3 24 3 25 2 RF SERVO SCHEMATIC DIAGRAM ...

Page 48: ...3 FRONT MIC SCHEMATIC DIAGRAM A B C D E F G H I J K L M N O P Q R S T 3 26 3 27 ...

Page 49: ...3 28 3 29 4 USB CONTROLLER SCHEMATIC DIAGRAM A B C D E F G H I J K L M N O P Q R S T ...

Page 50: ...5 AMP SCHEMATIC DIAGRAM 5TOOL A B C D E F G H I J K L M N O P Q R S T 3 30 3 31 ...

Page 51: ...6 AMP SCHEMATIC DIAGRAM 7TOOL A B C D E F G H I J K L M N O P Q R S T 3 32 3 33 ...

Page 52: ...A46 A26 A53 A50 A45 A47 274 452 452 275 261 261 261 OPTIONAL PART JACK OPTION 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 4 1 4 2 SECTION 4 EXPLODED VIEWS ...

Page 53: ...EMBLY DECK MECHA LOADING DP 9 SH 015A 4680R E008A MOTOR MECH FEEDING RF 300EA 1D390 MABUCHI NSP 015B 4560R 0008A PULLEY MOTOR 016 6871R 9294A PWB PCB ASSEMBLY TOTAL DP 9C LOADING 017 4470R 0176A GEAR DVD DP 9 LOADING MOLD 018 4974R 0067A GUIDE DVD DP 9C UP DOWN MOLD 019 3210R M008A FRAME DP 9C UP DOWN MOLD 020 3040R M066A BASE MAIN DP 9T MOLD NSP 021 4681R B009B MOTOR ASSEMBLY DECK MECHA DP9 FEEDI...

Page 54: ...on BATTERY 808 FILTER CIRC 826 MICRO PHONE 827 INSTRUCTION ASSEMBLY 801 REMOCON 900 811 PLUG ASS Y 1WAY YELLOW 824 ANTENNA LOOP AM 825 ANTENNA FM 828 AC ADAPTOR BAG 804 PACKING CASING 803 BOX 802 PACKING CASING 803 OPTIONAL PART ...

Page 55: ......

Page 56: ...5 1 SECTION 5 SPEAKER SECTION CENTER SPEAKER MODEL LHS 55SBC A70 750 751 752 753 754 755 ...

Page 57: ...5 2 FRONT REAR SPEAKER MODEL LHS 55SBS 857 856 851 852 853 851 855 854 850 A80 OPTIONAL PART LHS 75SBS ONLY ...

Page 58: ...5 3 SUB WOOFER SPEAKER MODEL LHS 55SBW 950 956 951 955 954 953 952 A90 ...

Page 59: ......

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