LG LX-D2640 Service Manual Download Page 8

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SECTION 2. ELECTRICAL

P-SENS PART CHECK

ZD 601(+) Voltage check

IC301 26PIN PATTERN Check

D602(+) rectification waveform check

ZD601 replacement

D602 Replacement

VKK CHECK

PN601 31pin -27V check

Pattern check front pcb Ass’y

C668(-) DC -32V check

D602(-) DC -27V check

A601 EMITTER DC -27V check

Pattern check

D603, D605 replacement

Q601 replacement

ZD602 check replacement

❏

TROUBLESHOOTING GUIDE

YES

Summary of Contents for LX-D2640

Page 1: ...STYLISH DVD MICRO HOME THEATER SYSTEM SERVICE MANUAL P N 3829RAT115B AUGUST 2004 MODEL LX D2640 LXS D2640W SERVICE MANUAL MODEL LX D2640 LXS D2640W ...

Page 2: ... 2 29 SECTION 3 DVD PART DVD ELECTRICAL TROUBLESHOOTING GUIDE 3 1 SCHEMATIC DIAGRAM 3 7 PRINTED CIRCUIT DIAGRAM 3 13 SECTION 4 EXPLODED VIEWS CABINET AND MAIN FRAME SECTION D2640 4 1 CABINET AND MAIN FRAME SECTION DP2640 4 3 TAPE DECK MECHANISM SINGLE AUTO REVERSE DECK 4 5 TAPE DECK MECHANISM SINGLE AUTO DECK OPTIONAL 4 7 DECK Mechanism Exploded View 4 9 SECTION 5 SPEAKER PART 5 1 LXS D2640W 5 1 S...

Page 3: ...ver be touched 4 Laser 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 t...

Page 4: ...tive 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 AC leakage the metal part of the soldering iron should be grounded 5 Workers should be grounded by an armband 1M Ω 6 Care should be taken not to permit the laser pick up to come in contact with clothing in order to prevent sta tic electricity changes in the clothing to...

Page 5: ...harges 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 comparabl...

Page 6: ...ction Mass 4 0kg External dimensions W x H x D 170 x 340 x 243 mm DVD VCD CD player Frequency response audio 200 18000 Hz Signal to noise ratio audio More than 70 dB 1 kHz Signal to noise ratio video More than 60 dB 1 kHz Dynamic range audio More than 70 dB Video output 1 0 V p p 75 Ω S video output Y 1 0 V p p 75 Ω C 0 3 V p p 75 Ω Cassette tape player Tape Speed 3 kHz 3 Wow Flutter 0 25 MTT 111 ...

Page 7: ... 1 6 MEMO ...

Page 8: ...aveform check ZD601 replacement D602 Replacement VKK CHECK PN601 31pin 27V check Pattern check front pcb Ass y C668 DC 32V check D602 DC 27V check A601 EMITTER DC 27V check Pattern check D603 D605 replacement Q601 replacement ZD602 check replacement TROUBLESHOOTING GUIDE YES ON YES YES YES YES YES ON ON ON ON ON ...

Page 9: ... 9 AC voltage output check PN901 5 7 PIN DC power check IC904 IC909 IC906 replacement PATT check D911 912 913 914 check replacement Transformer replacement System cable check IC904 replacement IC501 replacement System cable check C902 DC power check IC902 replacement PATT check IC501 pin8 H check Ic907 912 replacement PATT check PN901 pin7 DC power check IC908 replacement PATT check YES YES YES YE...

Page 10: ...ut check IC701 pin8 12 13 signal input check IC701 pin10 High check IC701 Power check replacement IC702 pin12 High check IC702 power check replacement Q702 Base H check Q720 Q770 Q730 Base L check Q702 Base H check No sound Ic702 pin 4 6 signal output check Realy connected check R781 voltage check Q780 Base H check Speaker connected check Speaker connected check IC701 pin3 4 15 signal output check...

Page 11: ...3 pin4 11 signal input check AUX AUX2 IC603 pin1 12 pin5 14 signal input check JK601 signal input check CD IC601 pin3 26 signal input check PN602 pin15 17 signal input check TUNER IC603 pin2 15 signal input check Refer to Tuner pack troubleshooting YES YES YES YES YES YES YES YES ...

Page 12: ...ply check P SENS terminal check X301 replacement RESET circuit check IC601 Troubleshooting IC601 pin1 power check IC601 pin13 14 CLK Data signal check IC601 FUNCTION SELECTIOR check normal operation Refer to power supply check IC301 pin13 14 pin data check CD TAPE FUNCTION replacement PATTERN check IC601 replacement Refer to IC301 troubleshooting YES YES YES YES YES YES YES YES ON ON ON ON ON ON O...

Page 13: ...ng PLL CE DI DO CLK check operation check normal operation PLL_CEL Chip Enable DI Data input DO Data output CLK Tuner mode clock PLAY check KIA6289N IC202 4PinVCC power applied IC201 3 6 Pin signal output check Q209 259 Base Low check Refer to power supply check Deck Mecha operation performance check Deck Mecha replacement IC202 replacement YES YES YES YES YES YES YES ON ON ON ON ON ON ...

Page 14: ...es check Deck replacement Q202 Q252 Base Low check IC501 pin9 L check IC203 pin6 VCC power check Power trouble check C227 power input check Refer to power check R228 10V check L201 replacement Q204 Emitter oscilates check R212 R262 oscilates wave check Pattern check Q202 252 replacement YES YES YES YES YES YES YES YES ON ON ON ON ON ON ON ON ...

Page 15: ...24 A7 NC 25 PGM HALL DECK Counter signal input PORT 4 26 D5 NC 0 27 D6 NC 0 28 D7 NC 0 29 VSS2 VSS2 VSS 0 30 GND GND GND 0 31 VAREF VDD2 DC 5V 4 9 32 VDD VDD4 DC 5V 4 9 33 V0 FL01 FLT Grid voltage control signal output PORT 25 34 V1 FL02 FLT Grid voltage control signal output PORT 25 35 V2 FL03 FLT Grid voltage control signal output PORT 25 36 V3 FL04 FLT Grid voltage control signal output PORT 25...

Page 16: ... IC DATA SIGNAL SUPPLY PORT 0 75 V46 EXP1 CLK EXPENDER IC CLK SIGNAL SUPPLY PORT 0 76 V45 EXP2 CLK EXPENDER IC CLK signal supply PORT 0 77 V44 EXP2 DO EXPENDER IC DATA signal supply PORT 0 78 V43 MIC_SENS MIC_SENS signal input PORT 0 79 V42 LED CTL LED CONTROL PORT 4 7 80 V41 BEAT CUT TUNER BEAT CUT circuit Control PORT 0 81 V47 MOTOR DECK Motor Power Control 0 14 82 V48 SOL MD Solenoid Control 0 ...

Page 17: ...BASS I R BASS I R R CH BASS driving external constant PORT 5 I 20 TREBLE R TREBLE R R CH TREBLE driving external constant PORT 5 O 21 IS R IS R R CH SURROUND signal input PORT 5 I 22 MUX R MUX R R CH REC signal output PORT 5 O 23 IN R4 CD R R CH CD signal input PORT 5 I 24 IN R3 AUX R R CH AUX signal input PORT 5 I 25 IN R2 TUNER R R CH TUNER signal input PORT 5 I 26 IN R1 TAPE R R CH TAPE signal ...

Page 18: ...ion V Remarks 1 OUT A A_CH AMPOUTPUT 0 O 2 IN A A_CH NF INPUT 0 I 3 IN A A_CH INPUT 0 I 4 GND GND 7 38 5 IN B B_CH INPUT 0 I 6 IN B B_CH NF INPUT 0 I 7 OUT B B_CH AMPOUTPUT 0 O 8 VDD DC 12V 11 5 8 TDA7448 IC602 1 Vs Supply Voltage 9 2 IN1 FRONT_R signal input PORT 4 5 3 IN3 REAR_R signal input PORT 4 5 4 IN5 WOORER signal input PORT 4 5 5 OUT5 SUB_WOORER signal output PORT 4 5 6 OUT3 CENTR signal ...

Page 19: ...cription V Remarks 1 REC SW L CH REC L CH PLAY signal input PORT 0 O 2 GND GND GND 0 3 P B SW L CH P B L CH REC signal input PORT 0 O 4 CONT PLAY REC PLAY REC Switch Control PORT 0 12 I 5 GND GND GND 0 6 VCC DC 9V DC 12V 10 8 7 P B SW R CH P B R CH REC signal input PORT 0 O 8 GND GND GND 0 9 REC SW R CH REC R CH PLAY signal input PORT 0 O 2 PRE AMP IC KIA6225S IC201 Pin NO Symbol Description V Rem...

Page 20: ...UTPUT PORT 0 O 5 OUT OUTPUT R R CH OUTPUT PORT 0 O 6 OUT OUTPUT R R CH OUTPUT PORT 0 O 7 PRE PRE PRE AMP Vcc 36 I 8 SUB SUB GND 0 9 GND GND GND 0 10 IN1 INPUT L L CH INPUT PORT 0 I 11 IN1F L FEED L CH FEED BACK signal input PORT 0 I 12 ST BY ST BY MUTE STBY Control PORT 0 6 I 13 IN2F R FEED R CH FEED BACK signal input PORT 0 I 14 IN2 INPUT R R CH INPUT PORT 0 I 2 MAIN POWER IC STK403 240 IC701 Pin...

Page 21: ...l Description V Remarks 1 LPF1 IN LOW FASS FILTER 1 INPUT 2 6 I 2 LPF1 OUT LOW FASS FILTER 1 OUTPUT 2 6 O 3 OP1 OUT OPERATIONAL AMPLIFIER 1 OUTPUT 2 6 O 4 OP1 IN OPERATIONAL AMPLIFIER 1 INPUT 2 6 I 5 CC1 CURRENT CONTROL 1 0 6 6 CC2 CURRENT CONTROL 2 0 6 7 GND GND 0 8 LPF2 OUT LOW FASS FILTER 1 OUTPUT 2 6 O 9 LPF2 IN LOW FASS FILTER 1 INPUT 2 6 I 10 OP2 OUT OPERATIONAL AMPLIFIER 1 OUTPUT 2 6 O 11 O...

Page 22: ... 3 1 SECTION 3 DVD PART DVD ELECTRICAL TROUBLESHOOTING GUIDE 1 Power check flow ...

Page 23: ... 3 2 2 Test debug flow ...

Page 24: ... 3 3 ...

Page 25: ... 3 4 ...

Page 26: ... 3 5 ...

Page 27: ... 3 6 MEMO ...

Page 28: ... 5 1 SECTION 5 SPEAKER PART 857 856 853 859 858 859 858 859 858 861 853 855 862 854 851 860 852 850 MODEL LXS D2640W ...

Page 29: ... 5 2 MEMO ...

Page 30: ...2 15 2 16 BLOCK DIAGRAM ...

Page 31: ...2 17 2 18 SCHEMATIC DIAGRAM MAIN SCHEMATIC DIAGRAM ...

Page 32: ...2 19 2 20 AMP SCHEMATIC DIAGRAM ...

Page 33: ...2 21 2 22 FRONT SCHEMATIC DIAGRAM ...

Page 34: ...2 23 2 24 MIC POWER SCHEMATIC DIAGRAM ...

Page 35: ...2 25 2 26 DECK SCHEMATIC DIAGRAM ...

Page 36: ...2 27 2 28 WIRING DIAGRAM ...

Page 37: ...2 29 2 30 PRINTED CIRCUIT DIAGRAM MAIN P C BOARD DIAGRAM SOLDER SIDE ...

Page 38: ...2 31 2 32 MAIN P C BOARD DIAGRAM COMPONENT SIDE ...

Page 39: ...2 33 2 34 PRINTED CIRCUIT DIAGRAM AMP P C BOARD DIAGRAM SOLDER SIDE ...

Page 40: ...2 35 2 36 AMP P C BOARD DIAGRAM COMPONENT SIDE ...

Page 41: ...2 37 2 38 FRONT P C BOARD DIAGRAM SOLDER SIDE ...

Page 42: ...2 39 2 40 FRONT P C BOARD DIAGRAM COMPONENT SIDE ...

Page 43: ...2 41 2 42 MIC P C BOARD DIAGRAM ...

Page 44: ...2 43 2 44 POWER P C BOARD DIAGRAM ...

Page 45: ...2 45 2 46 MEMO MEMO ...

Page 46: ...3 7 3 8 SCHEMATIC DIAGRAM MPEG SCHEMATIC DIAGRAM SECTION 3 DVD PART ...

Page 47: ...3 9 3 10 RF SERVO SCHEMATIC DIAGRAM ...

Page 48: ...3 11 3 12 I O SCHEMATIC DIAGRAM ...

Page 49: ...3 13 3 14 PRINTED CIRCUIT DIAGRAM MIAN P C BOARD DIAGRAM SOLDER SIDE ...

Page 50: ...3 15 3 16 MIAN P C BOARD DIAGRAM COMPONENT SIDE ...

Page 51: ...4 1 4 2 455 331 305 290 A42 287 A45 FAN A47 301 450 303 302 284 288 258 285 454 283 281 280 282 286 284 KEY MIC ARRAY SECTION 4 EXPLODED VIEWS CABINET AND MAIN FRAME SECTION D2640 ...

Page 52: ...4 3 4 4 455 351 270 276 A41 A46 A43 302 301 450 303 275 A26 259 258 454 257 255 254 264 263 261 262 260 253 251 250 252 A00 253 CABINET AND MAIN FRAME SECTION DP2640 ...

Page 53: ...01 007 401 002 506 006 037 016 017 018 019 020 022 A01 015 023 403 504 025 021 505 401 009 507 402 502 401 009 013 406 409 036 035 039 031 029 028 027 040 026 028 038 032 501 502 TAPE DECK MECHANISM SINGLE AUTO REVERSE DECK ...

Page 54: ...8 401 009 402 003 011 401 009 013 406 407 029 028 401 027 408 030 032 026 023 403 504 025 015 401 008 007 006 016 018 017 019 020 022 A01 021 505 401 002 501 502 TAPE DECK MECHANISM SINGLE AUTO DECK OPTIONAL ...

Page 55: ...ODED VIEW DP 7 OLD 429 429 026 010 018 013 014 017 015 015A 011 430 431 011A 012 004 001 002 003 A01 A26 A02 020 430 430 430 430 012 021 433 433 012 012 028 022 432 024 A03 025 030 015B 015C 435 029 031 431 431 431 024A 024A 024B ...

Page 56: ...P 9 NEW Deck Mechanism Exploded View 026 001 002 003 A01 020 018 014 013 017 435 012 019 012 440 015B 015A 015 016 A02 439 012A 012A 010 432 030 025 024 431 435 430 021 035A 439 035 036 A03 A26 4 11 4 12 ...

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