LG-XHT5025X-cdr-sm 电路图 维修手册.pdf

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1、DVD/CD RECEIVER SERVICE MANUAL SERVICE MANUAL Website Internal Use Only P/NO : AFN32853257 NOVEMBER, 2007 MODELS : XH-T5020X / XH-T5025X LH-T5025X MODELS : XH-T5020X / XH-T5025X / LH-T5025X RadioFans.CN 收音机爱 好者资料库 1-1 CONTENTS SECTION 1. GENERAL SERVICING PRECAUTIONS . . . . . . . . . . . . . . . .

2、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 ESD PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 SERVICE INFORMATION FOR EEPROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

3、 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-7 SECTION 2. AUDIO PART AUDIO TROUBLESHOOTING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 WIRING DIAGRAM . . . . . . . . .

4、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4 BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6 CIRCUIT DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5、 . . . . . . . . . . . . . . . . . . . . . . 2-8 PRINTED CIRCUIT DIARGAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-26 SECTION 3. DVD & AMP PART ELECTRICAL TROUBLESHOOTING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1 A

6、MP CIRCUIT DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-23 PRINTED CIRCUIT DIARGAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-29 SECTION 4. EXPLODED VIEWS . . . . . . . . . . . . . . . . . .

7、. . . . . . . . . . . . . . . . . . . . . . . . .4-1 SECTION 5. SPEAKER PART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1 SECTION 6. REPLACEMENT PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1 Copyright 2007 LG Electro

8、nics.Inc.All right reserved. Only for training and service purposes LGE Internal Use Only RadioFans.CN 收音机爱 好者资料库 Copyright 2007 LG Electronics.Inc.All right reserved. Only for training and service purposes LGE Internal Use Only 1-2 SERVICING PRECAUTIONS NOTES REGARDING HANDLING OF THE PICK-UP 1. No

9、tes for transport and storage 1) The pick-up should always be left in its conductive bag until immediately prior to use. 2) The pick-up should never be subjected to external pressure or impact. 2. Repair notes 1) The pick-up incorporates a strong magnet, and so should never be brought close to magne

10、tic materials. 2) The pick-up should always be handled correctly and carefully, taking care to avoid external pressure and impact. If it is subjected to strong pressure or impact, the result may be an operational malfunction and/or damage to the printed-circuit board. 3) Each and every pick-up is al

11、ready individually adjusted to a high degree of precision, and for that reason the adjustment point and installation screws should absolutely never 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 outpu

12、t 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, therefore, a cotton swab

13、should be used, taking care not to distort this. 6) Never attempt to disassemble the pick-up. Spring by excess pressure. If the lens is extremely dirty, apply isopropyl alcohol to the cotton swab. (Do not use any other liquid cleaners, because they will damage the lens.) Take care not to use too muc

14、h of this alcohol on the swab, and do not allow the alcohol to get inside the pick-up. Storage in conductive bagDrop impact NEVER look directly at the laser beam, and dont allow contact fingers or other exposed skin. Magnet How to hold the pick-up Conductive Sheet Cotton swab Pressure Pressure SECTI

15、ON 1. GENERAL RadioFans.CN 收音机爱 好者资料库 1-3 Copyright 2007 LG Electronics.Inc.All right reserved. Only for training and service purposes LGE Internal Use Only NOTES REGARDING COMPACT DISC PLAYER REPAIRS 1. Preparations 1) Compact disc players incorporate a great many ICs as well as the pick-up (laser

16、diode).These components are sensitive to, and easily affected by, static electricity. If such static electricity is high voltage, components can be damaged, and for that reason components should be handled with care. 2) The pick-up is composed of many optical components and other high-precision comp

17、onents. Care must be taken, therefore, to avoid repair or storage where the temperature of humidity is high, where strong magnet- ism is present, or where there is excessive dust. 2. Notes for repair 1) Before replacing a component part, first disconnect the power supply lead wire from the unit 2) A

18、ll 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 electri

19、city.) 4) To prevent AC leakage, the metal part of the soldering iron should be grounded. 5) Workers should be grounded by an armband (1M ) 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 es

20、cape from the armband. 7) The laser beam from the pick-up should NEVER be directly facing the eyes or bare skin. Resistor (1 Mohm) Conductive Sheet Resistor (1 Mohm) Armband 1-4 ESD PRECAUTIONS Copyright 2007 LG Electronics.Inc.All right reserved. Only for training and service purposes LGE Internal

21、Use Only Electrostatically Sensitive Devices (ESD) Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called Electrostatically Sensitive Devices (ESD). Examples of typical ESD devices are integrated circuits and some field-effect transi

22、stors and semiconductor chip components. The following techniques should be used to help reduce the incidence of component damage caused by static electricity. 1. Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain off any electrostatic charge on your bo

23、dy by touching a known earth ground. Alternatively, obtain and wear a commercially available discharging wrist strap device, which should be removed for potential shock reasons prior to applying power to the unit under test. 2. After removing an electrical assembly equipped with ESD devices, place t

24、he assembly on a conductive surface such as aluminum foil, to prevent electrostatic charge buildup or exposure of the assembly. 3. Use only a grounded-tip soldering iron to solder or unsolder ESD devices. 4. Use only an anti-static solder removal device. Some solder removal devices not classified as

25、 anti-static can generate electrical charges 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

26、 to install it. (Most replacement ESD devices are packaged with leads electrically shorted together by conductive foam, aluminum foil or comparable conductive materials). 7. Immediately before removing the protective material from the leads of a replacement ESD device, touch the protective material

27、to the chassis or circuit assembly into which the device will by installed. CAUTION : BE SURE NO POWER IS APPLIED TO THE CHASSIS OR CIRCUIT, AND OBSERVE ALL OTHER SAFETY PRECAUTIONS. 8. Minimize bodily motions when handing unpackaged replacement ESD devices. (Otherwise harmless motion such as the br

28、ushing together of your clothes fabric or the lifting of your foot from a carpeted floor can gener- ate static electricity sufficient to damage an ESD device). CAUTION. GRAPHIC SYMBOLS THE LIGHTNING FLASH WITH APROWHEAD SYMBOL.WITHIN AN EQUILATERAL TRIANGLE, IS INTENDED TO ALERT THE SERVICE PERSONNE

29、L TO THE PRESENCE OF UNINSULATED “DANGEROUS VOLTAGE” THAT MAY BE OF SUFFICIENT MAGNITUDE TO CONSTITUTE A RISK OF ELECTRIC SHOCK. THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE LITERATURE. 1-5

30、Copyright 2007 LG Electronics.Inc.All right reserved. Only for training and service purposes LGE Internal Use Only SERVICE INFORMATION FOR EEPROM(DVD PART) POWER ON DVD LOGO Status (NO Disk status) Remote control Pause key-1-4-7-2 in order. Press number 09, Press character AF (16 for a while) Use ar

31、row key ( ) to move to appropriate position and make changes Press pause key once Change will be applied when power OFF-ON. NAME OPT 1 OPT 2 OPT 3 OPT 4 OPT 5 OPT 6 OPT 7 OPT 8 OPT 9 OPT A OPT B OPT C OPT D OPT E OPT F OPT G HEX 55 5A 40 FF 52 05 FC 31 4F 00 00 00 00 00 00 00 DETECT NEW EEPROM (OPTI

32、ON EDIT SCREEN) Copyright 2007 LG Electronics.Inc.All right reserved. Only for training and service purposes LGE Internal Use Only 1-6 SERVICE INFORMATION FOR EEPROM(AMP PART) POWER ON FLD no disc status Remote control 2 + Front STOP push same timing during 5s FLD 00. Use arrow key ( ) move to appro

33、priate position and make changes Press ENTER key once FLD write ok or up ok Remote control 2 + Front STOP push same timing FLD display E2P CLR or EP CLR Auto power off DETECT NEW EEPROM (OPTION EDIT SCREEN) NAME HEX 00 16 01 EA 02 25 03 00 00 00 XH-T5020X NAME HEX 00 16 01 EA 02 23 03 00 00 00 XH-T5

34、025X NAME HEX 00 16 01 EA 02 24 03 00 00 00 LH-T5025X 1-7 SPECIFICATIONS GENERAL Power supply Refer to main label. Power consumption Refer to main label. Net Weight 3.6 kg External dimensions (W x H x D) 430 x 70 x 311 mm Operating conditions Temperature:5C to 35C, Operation status:Horizontal Operat

35、ing humidity 5% to 85% Laser Semiconductor laser, wavelength 650 nm CD/DVD Signal system PAL 625/50, NTSC 525/60 Frequency response (audio) 200 Hz to 18 kHz Signal-to-noise ratio (audio) More than 75 dB (1 kHz, NOP -6 dB, 20 kHz LPF/A-Filter) Dynamic range (audio) More than 70 dB Harmonic distortion

36、 (audio) 0.5 % (1 kHz, at 1W position) (20 kHz LPF) VIDEO Video input 1.0 V (p-p), 75 , negative sync., RCA jack x 1 Video output 1.0 V (p-p), 75 , negative sync., RCA jack x 1/SCART (TO TV) COMPONENT VIDEO OUT (Y) 1.0 V (p-p), 75 ohms, negative sync, RCA jack x 1 (PB)/(PR) 0.7 V (p-p), 75 ohms, RCA

37、 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 - 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 +

38、 70 W (4at 1 kHz, THD 10 %) Surround mode Front:70 W + 70 W (THD 10 %) Center*:70 W Surround*:70 W + 70 W (4at 1 kHz, THD 10 %) Subwoofer*:150 W (3at 30 Hz, THD 10 %) Inputs AUDIO IN, OPTICAL IN Outputs MONITOR OUT, EURO AV (TO TV) OUT, COMPONENT VIDEO OUT SPEAKERS (SH52PH) Front SpeakerCenter speak

39、erRear SpeakerPassive Subwoofer (SH52PH-F)(SH52PH-C)(SH52PH-S)(SH52PH-W) Type2 Way 3 Speaker2 Way 3 Speaker1 Way 1 Speaker1 Way 1 Speaker Impedance4443 Frequency Response100 - 20000 Hz150 - 20000 Hz130 - 20000 Hz40 - 1500 Hz Sound Pressure Level82 dB/W (1m)82 dB/W (1m)82 dB/W (1m)80 dB/W (1m) Rated

40、Input Power70 W70 W70 W150 W Max.Input Power140 W140 W140 W300 W Net Dimensions260 x 1100 x 260 mm330 x 86 x 121 mm114 x 208.5 x 83 mm212 x 395 x 341 mm (W x H x D) Net Weight3.0 kg1.15 kg0.55 kg6.0 kg (* Depending on the sound mode settings and the source, there may be no sound output.) Copyright 2

41、007 LG Electronics.Inc.All right reserved. Only for training and service purposes LGE Internal Use Only Copyright 2007 LG Electronics.Inc.All right reserved. Only for training and service purposes LGE Internal Use Only SPEAKERS (SH52TH) Front Speaker Center speaker Rear Speaker Passive Subwoofer (SH

42、52TH-F) (SH52TH-C) (SH52TH-S) (SH52TH-W) Type 2 Way 3 Speaker 2 Way 3 Speaker 2 Way 3 Speaker 1 Way 1 Speaker Impedance 4 4 4 3 Frequency Response 100 - 20000 Hz 150 - 20000 Hz 130 - 20000 Hz 40 - 1500 Hz Sound Pressure Level 82 dB/W (1m) 82 dB/W (1m) 82 dB/W (1m) 80 dB/W (1m) Rated Input Power 70 W

43、 70 W 70 W 150 W Max. Input Power 140 W 140 W 140 W 300 W Net Dimensions 260 x 1100 x 260 mm 330 x 86 x 121 mm 260 x 1100 x 260 mm 212 x 395 x 341 mm (W x H x D) Net Weight3.0 kg1.15 kg0.55 kg6.0 kg SPEAKERS (SH52SH) Front/Rear Speaker Center speaker Passive Subwoofer (SH52SH-S)(SH52SH-C)(SH52SH-W)

44、Type 1 Way 1 Speaker1 Way 2 Speaker1 Way 1 Speaker Impedance 4 4 3 Frequency Response 130 - 20000 Hz130 - 20000 Hz40 - 1500 Hz Sound Pressure Level 82 dB/W (1m)82 dB/W (1m)80 dB/W (1m) Rated Input Power 70 W70 W150 W Max. Input Power 140 W140 W300 W Net Dimensions(W x H x D) 114 x 208.5 x 83 mm330 x

45、 86 x 121 mm212 x 395 x 341 mm Net Weight 0.55 kg1.15 kg6.0 kg 1-8 2-1 Copyright 2007 LG Electronics.Inc.All right reserved. Only for training and service purposes LGE Internal Use Only SECTION 2. AUDIO PART AUDIO TROUBLESHOOTING GUIDE 1. POWER SUPPLY CIRCUIT Insert power cord YES YES YES YES YES YE

46、S 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. Is the Digitron on correctly? Is power on? Does initial read work? Does it play? Does it

47、 output audio? OK 2-2 Copyright 2007 LG Electronics.Inc.All right reserved. Only for training and service purposes LGE Internal Use Only 2. FRONT CIRCUIT (1/2) YES YES YES YES YES YES YES NONO Reconnect it. (Refer to notice *1) Red LED turn off?Check if PN301 is ok? NO NO NO Refer to smps part. Chec

48、k pattern and resoldering Is the Digitron on correctly? Check if all buttons are ok? Check if the front power is ok?(*2) Check if DIS301 is ok? NO 1 Check if the remote control 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 18p

49、in of CN901 in amp part *2 : PN603 Pins. PIN1 : -35 VKK PIN2 : -30 FL+ PIN3 : -33 FL- PIN7 : +5V PIN13 : +5VA 2-3 Copyright 2007 LG Electronics.Inc.All right reserved. Only for training and service purposes LGE Internal Use Only 3. FRONT CIRCUIT (2/2) YES YES YES YES YESYES YES YES NO Refer to power(SMPS). NO Replace R345 R350, R154. Check if the power part of the front is ok? Check if R345R350, R154 ok? Refer to micom circuit. 1 NO