LG-LHS26S-cdr-sm 电路图 维修手册.pdf

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1、DVD/CD RECEIVER SERVICE MANUAL MODELS : LH-T2645(X)/LH-TK2645(X)/LH-T2665(X)/LH-TK2665(X)/LH-T2660(X)/LH-TK2660(X)SERVICE MANUAL P/NO : AFN31220002AUGUST, 2006 MODELS : LH-T2645(X)/LH-TK2645(X)/LHS-26SGS/26SGW LH-T2665(X)/LH-TK2665(X)/LHS-26SQS/26SQW LH-T2660(X)/LH-TK2660(X)/LHS-26SHS/26SHW LH-T2645

2、(X)/LH-TK2645(X) LH-T2665(X)/LH-TK2665(X) LH-T2660(X)/LH-TK2660(X) RadioFans.CN 收音机爱 好者资料库 1-1 CONTENTS SECTION 1. GENERAL SERVICING PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 ESD PRECAUTIONS . . . . . . . . . . . . . . . . . . . . .

3、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 SERVICE INFORMATION FOR EEPROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4、 .1-6 SECTION 2. AUDIO PART AUDIO TROUBLESHOOTING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4 BLOCK DIAGRAM . . . . . . . . .

5、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6 CIRCUIT DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8 PRINTED CIRCUIT DIARGAMS . . . . . . . . . . . . . . . . . . . . . . . . . . .

6、 . . . . . . . . . . . . . . . . . 2-28 SECTION 3. DVD & AMP PART ELECTRICAL TROUBLESHOOTING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1 DVD & AMP CIRCUIT DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-22 PRINTED CIRCU

7、IT DIARGAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-28 SECTION 4. EXPLODED VIEWS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1 SECTION 5. SPEAKER PART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

8、. . . . .5-1 SECTION 6. REPLACEMENT PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1 RadioFans.CN 收音机爱 好者资料库 1-2 SERVICING PRECAUTIONS NOTES REGARDING HANDLING OF THE PICK-UP 1. Notes for transport and storage 1) The pick-up should always be left in its conductive bag until im

9、mediately 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 magnetic materials. 2) The pick-up should always be handled correctly and carefully, taking care to av

10、oid 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 already individually adjusted to a high degree of precision, and for that reason the adjustment poi

11、nt 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 output part (lens, etc.) of the pick-up if it is damaged. 5) Cleaning the lens surface If there is dus

12、t 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 cot- ton swab should be used, taking care not to distort this. 6) Never attempt to disassemble the pick-up.

13、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 much of this alcohol on the swab, and do not allow the alcohol to get inside the pick-up. Storage

14、 in conductive bagDrop impact NEVER look directly at the laser beam, and dont let contact fingers or other exposed skin. Magnet How to hold the pick-up Conductive Sheet Cotton swab Pressure Pressure SECTION 1. GENERAL RadioFans.CN 收音机爱 好者资料库 1-3 NOTES REGARDING COMPACT DISC PLAYER REPAIRS 1. Prepara

15、tions 1) Compact disc players incorporate a great many ICs as well as the pick-up (laser 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

16、 care. 2) The pick-up is composed of many optical components and other high-precision components. 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

17、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

18、 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 ) 6) Care should be taken not to permit the laser pick-up to come in con

19、tact with clothing, in order to prevent static electricity changes in the clothing to escape 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 Electrostatically

20、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 transistors and semiconductor chi

21、p 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 body by touching a known eart

22、h 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 the assembly on a conductive

23、 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 anti-static can generate e

24、lectrical 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 to install it. (Most repla

25、cement 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 to the chassis or circuit a

26、ssembly 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 brushing together of your clo

27、thes 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 PERSONNEL TO THE PRESENCE OF UNINS

28、ULATED “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 SERVICE INFORMATION FOR EE

29、PROM POWER ON DVD LOGO Status (NO Disk status) Remotecontrol Pause key-1-4-7-2 in order. Press number 09, Press charater AF (16 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. * OPTION NTSC model doesnt hav

30、e VCR option and use DVD option BF as VCR option. (only DVD exist) PAL model has another separate VCR option. (Both VCR and DVD exist) NAMEHEX OPT 155 OPT 241 OPT 340 OPT 4FF OPT 552 OPT 605 OPT 7F8 OPT 831 OPT 90C OPT A00 OPT B00 OPT C00 OPT D00 OPT E00 OPT F00 OPT G00 DETECT NEW EEPROM (OPTION EDI

31、T SCREEN) * Refer to page 6-1. 1-6 SPECIFICATIONS GENERAL Power supply Refer to main label Power consumption Refer to main label Net Weight 3.9 kg External dimensions (W x H x D)430 x 57 x 295 mm Operating conditions Temperature: 5C to 35C, Operation status: Horizontal Operating humidity 5% to 85% C

32、D/DVD Laser Semiconductor laser, wavelength 650 nm Signal system PAL 625/50, NTSC 525/60 Frequency response (audio) 150 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 (audio) 0.5 % (1 kHz, a

33、t 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) 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

34、 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-T26s) Stereo mode Front: 30 W + 30 W (THD 10 %) Centre*: 30 W Surround*: 30 W + 30 W (6 at 1 kHz, THD 10 %) Subwoofer*: 70 W (8 at 30 Hz, THD 10 %) InputAUX

35、IN, MIC OutputsMONITOR, PHONES: (32 , 1.0 V) SPEAKERS(LHS-26SG) Satellite SpeakerPassive Subwoofer Type1 Way 1 Speaker1 Way 1 Speaker Impedance6 8 Frequency Response130 - 20,000 Hz 50 - 1,500 Hz Sound Pressure Level83 dB/W (1m) 82 dB/W (1m) Rated Input Power30W 70W Max. Input Power60W 140W Net Dimen

36、sions88 x 100 x 95 mm 160 x 350 x 325 mm Net Weight0.54 kg 4.12 kg (* Depending on the sound mode settings and the source, there may be no sound output.) 1-7 SPEAKERS(LHS-26SH) Satellite SpeakerPassive Subwoofer Type 1 Way 1Speakers1 Way 1Speaker Impedance 6 8 Frequency Response 130 - 20,000 Hz 50 -

37、 1,500 Hz Sound Pressure Level 130 - 20,000 Hz 50 - 1,500 Hz Rated Input Power 30W 70W Max Input Power 60W 140W Net Dimensions 88 x 100 x 95 mm 160 x 350 x 325 mm Net Weight 0.54 kg 4.12 kg SPEAKERS(LHS-26SQ) Satellite SpeakerPassive Subwoofer Type1 Way 1 Speaker1 Way 1 Speaker Impedance6 8 Frequenc

38、y Response130 - 20,000 Hz 50 - 1,500 Hz Sound Pressure Level83 dB/W (1m) 82 dB/W (1m) Rated Input Power30W 70W Max. Input Power60W 140W Net Dimensions88 x 100 x 95 mm 160 x 350 x 325 mm Net Weight0.54 kg 4.12 kg 2-1 SECTION 2. AUDIO PART AUDIO TROUBLESHOOTING GUIDE 1. POWER SUPPLY CIRCUIT 2-2 2. FRO

39、NT 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? 2-3 3. FRONT CIRCUIT (2/2) CHECK IF R345 R350, R154 OK. REPLACE R345 R350, R154. Check if the Remocon waceform

40、of the P3101 pin 10 is OK Check if the RM301 voltage is OK(5V) Resoldering or Replace RM301 2-42-5 WIRING DIAGRAM 2-62-7 BLOCK DIAGRAM 2-82-9 CIRCUIT DIAGRAMS 1. SMPS(POWER) CIRCUIT DIAGRAM NOTES) Symbol denotes AC ground. NOTES) Symbol denotes DC chassis ground. NOTE) Warning NOTE) Parts that are s

41、haded are critical NOTE) With respect to risk of fire or NOTE) electricial shock. A 1 2 3 4 5 6 7 8 9 10 11 12 BCDEFGHIJKLMNOPQRST 2-102-11 2. POWER INTERFACE CIRCUIT DIAGRAM A 1 2 3 4 5 6 7 8 9 10 11 12 BCDEFGHIJKLMNOPQRST 2-122-13 3. -COM(MAIN) CIRCUIT DIAGRAM A 1 2 3 4 5 6 7 8 9 10 11 12 BCDEFGHI

42、JKLMNOPQRST 2-142-15 4. SERVO CIRCUIT DIAGRAM A 1 2 3 4 5 6 7 8 9 10 11 12 BCDEFGHIJKLMNOPQRST 2-162-17 5. I/O CIRCUIT DIAGRAM A 1 2 3 4 5 6 7 8 9 10 11 12 BCDEFGHIJKLMNOPQRST 2-182-19 6. MIC CIRCUIT DIAGRAM A 1 2 3 4 5 6 7 8 9 10 11 12 BCDEFGHIJKLMNOPQRST 2-202-21 7. USB CIRCUIT DIAGRAM A 1 2 3 4 5

43、 6 7 8 9 10 11 12 BCDEFGHIJKLMNOPQRST 2-222-23 8. MIC & USB CIRCUIT DIAGRAM A 1 2 3 4 5 6 7 8 9 10 11 12 BCDEFGHIJKLMNOPQRST 2-242-25 9. HDMI CIRCUIT DIAGRAM(OPTIONAL PART) A 1 2 3 4 5 6 7 8 9 10 11 12 BCDEFGHIJKLMNOPQRST 2-262-27 10. FRONT CIRCUIT DIAGRAM A 1 2 3 4 5 6 7 8 9 10 11 12 BCDEFGHIJKLMNO

44、PQRST 2-282-29 PRINTED CIRCUIT BOARD DIAGRAMS 1. MAIN P.C. BOARD DIAGRAM ( TOP VIEW ) 2-302-31 2. MAIN P.C. BOARD DIAGRAM ( BOTTOM VIEW ) 2-322-33 3. SMPS P.C. BOARD 2-342-35 4. KEY P.C. BOARD 5. TIMER P.C. BOARD ( BOTTOM VIEW ) ( TOP VIEW ) ( TOP VIEW )( BOTTOM VIEW ) 3-1 ELECTRICAL TROUBLESHOOTING

45、 GUIDE 1. System operation flow Power On No Yes Yes Yes No No No Show LOGO Tray Closed? Tray Close to Closed position SLED Moves to Inner Position 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. Systemope

46、rati 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 3-2 2. Test & debug flow TEST Check the POWER PART No Yes N

47、o 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 Volta

48、ge 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 3-3 A ES8381 Check the related circuit of ES8381 IC501 Pins133, 134, 137, 138, 139, 140 Check the Tray control IO pins on ES8381. Check the T

49、ray 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? 3-4 B Motor 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. 3-5 C ES8381. Check the laser power circuit on ES8381 and connecting to power transistor.(Q405, Q4