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LG HT552TH, Service Manual

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LG HT552TH Service Manual Download Page 28

3-1

ELECTRICAL TROUBLESHOOTING GUIDE

SECTION 3. DVD & AMP PART

1. AMP PROTECTION

"PROTECTION" appears on the FLD.

Power on.

Replace TI AMP IC(IC701~704).

"PROTECTION" 

appears continuously on the FLD.

Is the IC101 pin64 

"LOW" signal(0V)?

Is the Q703, Q704 and 705 normal?

After unplug power cord, connect again.

OK.

Replace IC101.

Replace the Q703, Q704 and Q705.

No

No

No

Yes

Yes

Yes

Summary of Contents for HT552TH

Page 1: ...DVD CD RECEIVER SERVICE MANUAL MODEL HT552TH SH52TH C SH52TH S SH52TH W SERVICE MANUAL P NO AFN31640733 DECEMBER 2006 MODEL HT552TH SH52TH C SH52TH S SH52TH W http biz lgservice com ...

Page 2: ...AUDIO PART AUDIO TROUBLESHOOTING GUIDE 2 1 WIRING DIAGRAM 2 4 BLOCK DIAGRAM 2 6 CIRCUIT DIAGRAMS 2 8 PRINTED CIRCUIT DIARGAMS 2 28 SECTION 3 DVD AMP PART ELECTRICAL TROUBLESHOOTING GUIDE 3 1 DVD AMP CIRCUIT DIAGRAMS 3 22 PRINTED CIRCUIT DIARGAMS 3 28 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: ...ter A F 1 6 for a while Use arrow key to move to approprite position and make changes Press pause key once Change will be applied when power OFF ON NAME HEX OPT 1 00 OPT 2 00 OPT 3 00 OPT 4 00 OPT 5 00 OPT 6 00 OPT 7 00 OPT 8 00 OPT 9 00 OPT A 00 OPT B 00 OPT C 00 OPT D 00 OPT E 00 OPT F 00 OPT G 00 DETECT NEW EEPROM OPTION EDIT SCREEN Refer to page 6 1 ...

Page 7: ...push same timing during 5s FLD 00 Use arrow key move to appropriate position and make changes Press ENTER key once FLD write ok or up ok Remotecontrol 2 Front STOP push same timing FLD display E2P CLR or EP CLR Auto power off NAME HEX 00 86 01 FA 02 23 03 00 04 00 DETECT NEW EEPROM OPTION EDIT SCREEN ...

Page 8: ...ge 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 8 000 Hz AM MW Tuning Range 522 1 620 kHz or 520 1 720 kHz Intermediate Frequency 450 kHz AMPLIFIER Stereo mode 70 W 70 W 4Ω at 1 kHz THD 10 Surround mode Front 70 W 70 W THD 10 Center 70 W Surround 70 W 70 W 4Ω at 1 kHz THD 10 Subwoofer 150 W 3Ω at 30 Hz THD 10...

Page 9: ...S YES YES YES Turn power on NO Check power plug and power supply circuit NO Check power supply circuit NO Check laser circuit Check focus circuit Check disc NO NO Check tracking servo circuit Check audio circuit Does red power led turn on Is power on Does initial read work Does it play Does it output audio OK ...

Page 10: ...pattern and resoldering Is digitron on normally Check if all buttons are ok Check if the front power is ok 2 Check if the DIS301 is ok NO 1 Check if the remotecontrol is ok NO 2 Power on Front b d ok 1 When it is needed to reconnected FFC cable into PN301 Short 1pin of PN103 with 18pin of CN901 in amp part 2 PN603 Pins PIN1 35 VKK PIN2 30 FL PIN3 33 FL PIN7 5V PIN13 5VA ...

Page 11: ... front is ok Check if R345 R350 R150 ok Refer to micom circuit 1 YES YES YES NO Reffer to power SMPS NO Reffer to micom circuit NO Check rm circuit Check if the power part of the front is ok Check if the remotecontrol waveform of the PN301 pin11 is ok Check if the RC2 voltage is ok 5V YES Resoldering or replace RC2 2 ...

Page 12: ...PN202 6630R FB05K 6630XE00111 PN204 11PIN MIC1 CN301 EAD35219301 MIC2 USB STEREO PN301 PN103 P4401 6630XE00123 23PIN CN902 CN901 P4402 6630XE00109 3PIN 15PIN 9PIN 14PIN TUNER KEY PCB 561 711O 6630XE00120 6630XE00120 6630XE00124 EAD35214501 EAD35219501 561 715N 561 661B 6630XE01224 6630XE00118 561 711C 6630R FB05R CABLE3 EAD35201502 CABLE1 EAD35201101 CABLE4 EAD35201302 CABLE2 EAD35632101 EAD352145...

Page 13: ...2 6 2 7 BLOCK DIAGRAM IC508 PORTA BLE IC204 AK5358 ADC IC203 NJM4580 OPAMP DVD_DI DVD_CLK DVD_CE DVD_DO IC501 IP9009A IC601 TAS5152 TAS5152 TAS5152 TAS5152 FL FR WF C RL RR ...

Page 14: ...E MODIFIED OR ALTERED WITHOUT PERMISSION FROM THE LG CORPORATION ALL COMPONENTS SHOULD BE REPLACED ONLY WITH TYPES IDENTI CAL TO THOSE IN THE ORIGINAL CIRCUIT SPECIAL COMPONENTS ARE SHADED ON THE SCHEMATIC FOR EASY IDENTIFICATION THIS CIRCUIT DIAGRAM MAY OCCASIONALLY DIF FER FROM THE ACTUAL CIRCUIT USED THIS WAY IMPLEMENTATION OF THE LATEST SAFETY AND PERFORMANCE IMPROVEMENT CHANGES INTO THE SET I...

Page 15: ...2 10 2 11 2 POWER INTERFACE 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 ...

Page 16: ...2 12 2 13 3 µ COM MAIN 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 ...

Page 17: ...2 14 2 15 4 SERVO 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 ...

Page 18: ...2 16 2 17 5 I O 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 ...

Page 19: ...2 18 2 19 6 MIC USB PTB 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 ...

Page 20: ...2 20 2 21 7 POWER KEY 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 ...

Page 21: ...2 22 2 23 8 TIMER 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 ...

Page 22: ...2 24 2 25 9 HDMI 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 ...

Page 23: ...PRINTED CIRCUIT BOARD DIAGRAMS 1 MAIN P C BOARD DIAGRAM TOP VIEW 2 26 2 27 ...

Page 24: ...2 28 2 29 2 MAIN P C BOARD DIAGRAM BOTTOM VIEW ...

Page 25: ...3 SMPS P C BOARD NOTES Warning NOTES Parts that are shaded are critical NOTES with respect to risk of fire or NOTES electricial shock 2 30 2 31 ...

Page 26: ...2 32 2 33 4 KEY P C BOARD 5 TIMER P C BOARD ...

Page 27: ...2 34 2 35 6 USB P C BOARD ...

Page 28: ...ROTECTION appears on the FLD Power on Replace TI AMP IC IC701 704 PROTECTION appears continuously on the FLD Is the IC101 pin64 LOW signal 0V Is the Q703 Q704 and 705 normal After unplug power cord connect again OK Replace IC101 Replace the Q703 Q704 and Q705 No No No Yes Yes Yes ...

Page 29: ...ecieve 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 IC101 initializes SERVO DSP RISC registers 2 Write RISC code to SDRAM 3 Reset RISC ...

Page 30: ...ock 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 Is the DC Voltage outputs OK 35V 30V 33V 12V 3 5V 5 6V 5V 12V 5 6V 3 3V 5V 7V 32 5V Are 3 3V and 5V DC outputs normal on main PCBA Update FLASH successfully Replace FLASH A ...

Page 31: ...1 Pins133 134 137 138 139 140 Check the Tray control IO pins on ES8381 Check the Tray control amplifyung circuit IC401 Check connection lines between SDRAM IC502 ES8381 and the SDRAM is damaged ES8381 VIDEO outputs properly Normal OPEN_SW CLOSE_SW signal ...

Page 32: ...Driver DRV_MUTE pin is High Motor Driver DRV_MUTE pin is High SLED and SLED output properly Check the connection line of DRV_MUTE Check the related circuit of SLEGN Check Focus connection on ES8381 and motor driver ...

Page 33: ...ng to power transistor Q405 Q406 Collector voltage of power transistor is OK Q405 Q406 Proper RF signal on ES8381 Proper SPINDLE signal on ES8381 SPNP SPNN output properly Check the related circuit on ES8381 RF signal Check the RF connection between IP9009 and ES8381 ...

Page 34: ... on ES8381 Proper TRACK signal on ES8381 TR TR output properly Check CD_DVDCT connection between IP9009 and ES8381 Check the related circuit on ES8381 CD DVDCT Check connections between ES8381 and pick up head Check the related circuit on ES8381 Check the TRACK connection on ES8381 and motor driver ...

Page 35: ...tween IC601 BCK LRCK ADATAO Check the related circuit of PWM Check Audio out Pins54 55 58 59 61 62 67 68 70 71 74 75 Normal PWM IC out IC601 PWM IC received correct data stream Check Digital Amp circuit IC701 IC702 IC703 IC704 ...

Page 36: ...s 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 Pin41 is high Check if IC101 Pin15 16 47 are high 5V Check if IC101 Pin1 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 37: ...ND DEBUGGING 1 SYSTEM 27MHz CLOCK RESET FLASH R W SIGNAL 1 ES8381 main clock is at 27MHz X501 3 8V 27MHz FIG 1 1 2 ES8381 reset is high active PWR_CTL SYSTEM µ COM IC101 PIN2 5 2VA Power Cord in DVD_RESET IC101 PIN 41 MRST IC501 PIN 251 FIG 1 2 ...

Page 38: ...3 11 2 SDRAM CLOCK 1 ES8381 main clock is at 27MHz X501 IC502 PIN 38 DCLK 93MHz Vp p 2 2 Vmax 2 7V FIG 2 1 3 Flash R W enable signal during download Downloading FRD IC503 PIN 28 FWR IC503 PIN 11 FIG 1 4 ...

Page 39: ...LOSE SIGNAL 1 Tray open close waveform OPENSW P4402 PIN3 CLOSESW P4402 PIN4 OPEN IC401 PIN 1 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 ...

Page 40: ... 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 3 Tray open waveform OPENSW P4402 PIN3 CLOSESW P4402 PIN4 OPEN IC401 PIN 1 CLOSE IC401 PIN 2 FIG 3 3 ...

Page 41: ...O 1 5V 1 4V 1 3V IC501 PIN 208 F 4 0V 3 6V 3 2V IC401 PIN 13 F 4 0V 3 6V 3 2V IC401 PIN 14 FIG 5 1 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 ...

Page 42: ...3 15 F IC401 PIN 13 CD_DVDCT IC501 PIN 169 RF IC501 PIN 196 FIG 7 2 DVD 7 DISC TYPE JUDGEMENT WAVEFORMS F IC401 PIN 13 CD_DVDCT IC501 PIN 169 RF IC501 PIN 196 FIG 7 1 DVD ...

Page 43: ...3 16 F IC401 PIN 13 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 ...

Page 44: ...3 17 CD_DVDCT IC501 PIN 169 FOO IC501 PIN208 F IC401 PIN 13 F IC401 PIN 14 FIG 8 2 CD 8 FOCUS ON WAVEFORMS CD_DVDCT IC501 PIN 169 FOO IC501 PIN208 F IC401 PIN 13 F IC401 PIN 14 FIG 8 1 DVD ...

Page 45: ...C CONDITION SPINO 1 4V 1 8V IC501 PIN 207 SP 3 6V 2 4V IC501 PIN 192 SP 3 6V 4 8V IC501 PIN 191 FIG 9 1 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 ...

Page 46: ...3 19 CD_DVDCT IC501 PIN 169 TRO IC501 PIN 210 TR IC401 PIN 12 TR IC401 PIN 11 FIG 10 2 CD 11 ES6698FD VIDEO OUTPUT WAVEFORMS 1 Full colorbar signal COMPOSIT IC501 PIN 134 FIG 11 1 ...

Page 47: ...3 20 2 Y IC501 PIN 140 FIG 11 2 1 Audio L R FIG 12 1 12 AUDIO OUTPUT FROM PWM IC IC602 PIN 1 7 ...

Page 48: ...3 21 BCK IC501 PIN 155 LRCK IC501 PIN 156 ASDATA3 2 Audio related Signal ADATA0 IC501 PIN 154 FIG 12 2 ...

Page 49: ...3 22 1 R620 TP611 or R621 TP612 2 R618 TP609 or R619 TP610 3 R612 TP603 or R613 TP604 4 R610 TP601 or R611 TP602 5 R614 TP605 or R615 TP606 6 R616 TP607 or R617 TP608 13 DVD AMP WAVEFORMS ...

Page 50: ...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 3 22 3 23 DVD AMP CIRCUIT DIAGRAMS 1 MPEG CIRCUIT DIAGRAM ...

Page 51: ...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 3 24 3 25 2 DSP CIRCUIT DIAGRAM ...

Page 52: ...3 AMP 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 3 26 3 27 ...

Page 53: ...PRINTED CIRCUIT BOARD DIAGRAMS 1 AMP P C BOARD DIAGRAM_TOP VIEW 3 28 3 29 ...

Page 54: ...3 30 3 31 2 AMP P C BOARD DIAGRAM_BOTTOM VIEW ...

Page 55: ...A26 A43 A44 A41 471 276 265 261 261 320 260 280 261 A47 CABLE4 CABLE3 CABLE1 SMPS AMP MAIN CN902 CN901 CN301 279 283 300 CABLE2 OPTIONAL PART 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 56: ... DECK MECHANISM EXPLODED VIEW DP 10A 026 001 002 003 A01 020 018 014 013 017 435 012 A26 019 012 440 015B 015A 015 016 A02 439 012A 012A 010 432 030 025 024 439 431 435 430 021 036 A03 4 3 4 4 ...

Page 57: ......

Page 58: ...4 9 PACKING ACCESSORY SECTION BATTERY 808 INSTRUCTION ASSEMBLY 801 REMOCON 900 824 ANTENNA LOOP AM 825 ANTENNA FM BAG 804 PACKING CASING 803 BOX 802 PACKING CASING 803 ...

Page 59: ......

Page 60: ...5 1 751 751 750 WIRE70 757A 753 753 753 753 752 A70B 757B 755 754 756 CENTER SPEAKER SH52TH C SECTION 5 SPEAKER SECTION A70 A70A ...

Page 61: ...5 2 4 LHS 96IA FRONT REAR SPEAKER SH52TH S WIRE80 F R WIRE81 F L WIRE WIRE82 R R WIRE83 R L A80 A80A A80B 853 853 853 853 853 850 852 852 855 855A 855B 861 860 859 857 858 856 A80C 851 854 ...

Page 62: ...2 LHS 76IB PASSIVE SUBWOOFER SPEAKER SH52TH W 5 3 A90 952 950 A90A 953 A90B 956 955 957 954 958 952 959 959 958 952 951 WIRE90 ...

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