LG LH-760PA Service Manual Download Page 29 | Manualshive

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3-2

2. Test & debug flow

TEST

Check the POWER PART

No

Yes

No

Yes

No

No

Yes

Yes

Check the POWER PART

Check the regulators or diode.

1. Check 27MHz 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

Is the

DC Voltage

outputs OK? (-41V, -22V,

-26.5V, ±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

«
...
27
28
29
30
31
...
»

Summary of Contents for LH-760PA

Page 1: ...DVD CD RECEIVER SERVICE MANUAL MODEL LH T7652SB LHS 76SBC LHS 76SBS LHS 76SBW SERVICE MANUAL MODEL LH T7652SB LHS 76SBC LHS 76SBS LHS 76SBW ...

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: ...ke changes Press pause key once Change will be applied when power OFF ON OPTION NTSC model doesn t have VCR option and use DVD option B F as VCR option only DVD exist PAL model has another separate VCR option Both VCR and DVD exist 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 EEPR...

Page 7: ...mediate 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 LH T76 S Stereo mode 100W 100W Rated Output Power 100W 4Ω at 1 kHz THD 10 Surround mode Front 100W 100W Rated Output Power 100W THD 10 Centre 100W Surround 100W 100W Rated Output Power 100W 4Ω at 1 kHz THD 10 Subwoofe...

Page 8: ...2 1 SECTION 2 AUDIO PART AUDIO TROUBLESHOOTING GUIDE 1 POWER SUPPLY CIRCUIT ...

Page 9: ...2 2 2 FRONT CIRCUIT 1 2 PIN2 PIN1 PIN3 PIN12 22 FL 41 VKK 26 5 FL 5 0 P1301 Short 1pin of CN901 with 4pin of CN901 in SMPS part CHECK IF THE P1301 IS OK CHECK IF THE DIS301 IS OK ...

Page 10: ...2 3 3 FRONT CIRCUIT 2 2 CHECK IF R345 R350 R154 OK REPLACE R345 R350 R154 Check if the Remocon waceform of the P3101 pin 10 is OK Check if the RM301 voltage is OK 5V Resoldering or Replace RM301 ...

Page 11: ......

Page 12: ...2 4 2 5 WIRING DIAGRAM ...

Page 13: ...2 6 2 7 BLOCK DIAGRAM ...

Page 14: ...AM 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 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 ...

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 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 USB 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 MIC USB 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 OPTIONAL PART 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: ...2 26 2 27 10 FRONT 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 24: ...2 28 2 29 PRINTED CIRCUIT BOARD DIAGRAMS 1 MAIN P C BOARD DIAGRAM TOP VIEW ...

Page 25: ...2 30 2 31 2 MAIN P C BOARD DIAGRAM BOTTOM VIEW ...

Page 26: ...2 32 2 33 3 SMPS P C BOARD ...

Page 27: ...2 34 2 35 4 KEY P C BOARD 5 TIMER P C BOARD BOTTOM VIEW TOP VIEW TOP VIEW BOTTOM VIEW ...

Page 28: ...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 29: ...ystem 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 Is the DC Voltage outputs OK 41V 22V 26 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 30: ...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 31: ...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 32: ...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 33: ... 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 34: ...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 35: ...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 36: ...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 37: ...3 10 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 38: ...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 39: ... 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 40: ...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 41: ...3 14 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 42: ...3 15 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 43: ...3 16 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 44: ...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 45: ...3 18 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 46: ...3 19 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 47: ...3 20 BCK IC501 PIN 155 LRCK IC501 PIN 156 ASDATA3 2 Audio related Signal ADATA0 IC501 PIN 154 FIG 12 2 ...

Page 48: ...3 21 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 49: ......

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 DSP P C BOARD DIAGRAM 3 28 3 29 TOP VIEW BOTTOM VIEW ...

Page 54: ...3 30 3 31 2 AMP P C BOARD DIAGRAM TOP VIEW BOTTOM VIEW ...

Page 55: ...3 A47 A00 A50 283 275 275 465 465 465 A48 OPTIONAL PART OPTIONAL PART AMP SMPS MAIN DSP CABLE1 CABLE2 P3201 P3401 465 271 MIC 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 SECTION 4 EXPLODED VIEWS 4 1 4 2 ...

Page 56: ...15 4681R A015A Motor Unclassified DECK MECHA LOADING DP 9 SH 015A 4680R E008A Motor DC RF 300EA 1D390 2V 90MA 25MA 1 015B 4560R 0008A Pulley MOLD POM MOTOR 016 6871R 9297A PCB Assembly DP 10T LOADING FEEDING 017 4470R 0176A Gear MOLD POM DVD DP 9 LOADING MO 018 4974R 0067A Guide MOLD POM DVD DP 9C UP DOWN MO 019 3210R M008A Frame MOLD ABS DP 9C UP DOWN MOLD 020 3040R M066A Base MOLD ABS MAIN DP 9T...

Page 57: ......

Page 58: ...ATTERY 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 832 DISC ...

Page 59: ...5 1 SECTION 5 SPEAKER SECTION 1 LHS 76SB CENTER SPEAKER LHS 76SBC A70 A70A 750 751 752 753 755 754 757 756 ...

Page 60: ...5 2 4 LHS 96SB FRONT REAR SPEAKER LHS 76SBS A80 A80A 851 853 854 856 855 857 850 852 ...

Page 61: ...5 3 2 LHS 76IB PASSIVE SUBWOOFER SPEAKER LHS 76SBW A90 A90A 960 954 958 957 953 955 953 953 951 950 956 952 959 961 OPTIONAL PART ...

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