LG-LHT551SB-cdr-sm 电路图 维修手册.pdf

DVD/CD RECEIVER SERVICE MANUAL MODELS : LH-T550SB, LH-T551SB, LH-T553SB LHS-55SBC, LHS-55SBS, LHS-55SBW MODELS : LH-T550SB, LH-T551SB, LH-T553SB LHS-55SBC, LHS-55SBS, LHS-55SBWSERVICE MANUAL RadioFans.CN 收音机爱 好者资料库 1-1 CONTENTS SECTION 1. GENERAL SERVICING PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 ESD PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5 SECTION 2. AUDIO PART AUDIO TROUBLESHOOTING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4 BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6 SCHEMATIC DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8 PRINTED CIRCUIT DIARGAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-22 SECTION 3. DVD & AMP PART ELECTRICAL TROUBLESHOOTING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1 DVD PART SCHEMATIC DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-22 SECTION 4. EXPLODED VIEWS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1 SECTION 5. SPEAKER PART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .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 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 magnetic 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 already 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 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, therefore, a cot- ton swab 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 much 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 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. Preparations 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 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 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 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 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 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 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 body 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 the 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 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 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 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 brushing 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 PERSONNEL 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 GENERAL Power supply Refer to main label Power consumption Refer to main label Weight 3.9 kg External dimensions (W x H x D) 430 x 54 x 350 mm Operating conditions Temperature: 5C to 35C, Operation status: Horizontal Operating humidity 5% to 85% CD/DVD Laser Semiconductor laser, wavelength 650 nm Signal system PAL 625/50, NTSC 525/60 Frequency response (audio) 200 Hz to 20 kHz Signal-to-noise ratio (audio) More than 75 dB (1 kHz, NOP, 20 kHz LPF/A-Filter) Dynamic range (audio) More than 70 dB Harmonic distortion (audio) 0.5 % (1 kHz, at 12W position) (20 kHz LPF/A-Filter) 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 S-video output (Y) 1.0 V (p-p), 75 , negative sync., Mini DIN 4-pin x 1 (C) 0.3 V (p-p), 75 Component Video output (Y) 1.0 V (p-p), 75 , negative sync., RCA jack x 1 (Pb)/(Pr) 0.7 V (p-p), 75 , RCA 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 - 10,000 Hz AM MW Tuning Range 522 - 1,620 kHz or 520 - 1,720 kHz Intermediate Frequency 450 kHz AMPLIFIER Stereo mode 70W + 70W (8 at 1 kHz, THD 10 %) Surround mode Front: 70W + 70W (THD 10 %) Center*: 70W Surround*: 70W + 70W (8 at 1 kHz, THD 10 %) Subwoofer*: 150W (4 at 30 Hz, THD 10 %) InputAV IN OutputsS-VIDEO, MONITOR, PHONES: (32 , 10.V) SPEAKERS Front SpeakerCenter SpeakerSubwoofer Type1 Way 1 Speaker1 Way 1 Speaker1 Way 1 Speaker Impedance8 8 4 Frequency Response110 - 20,000 Hz110 - 20,000 Hz40 - 1,500 Hz Sound Pressure Level82 dB/W (1m)82 dB/W (1m)82 dB/W (1m) Rated Input Power70W70W150W Max. Input Power140W140W300W Net Dimensions140 x222x153 mm300 x116x91 mm195x402x360 mm Net Weight0.95 kg1.0 kg5.6 kg (* Depending on the sound mode settings and the source, there may be no sound output.) SPECIFICATIONS 2-1 SECTION 2. AUDIO PART AUDIO TROUBLESHOOTING GUIDE 1. POWER SUPPLY CIRCUIT 2-2 2. FRONT CIRCUIT (1/2) PIN3 PIN4 PIN9 : -27.5 FL- : -32.4 VKK : -23.7 FL+ : +5.0 CN902CN902 2-3 3. FRONT CIRCUIT (2/2) 2-42-5 WIRING DIAGRAM WIRELESS OPTICAL IN SCART JACK OPTION SW AV1,2 COMPONENT MONITOR OUT S-VIDEO OUT TUNER SPEAKER TERMINAL MAIN PCB AMP PCB SMPS PCB MD FRONT PCB FRONT PCB MIC&USB PCB VFD H/P JACK USB JACK MIC JACK MIC JACK CN001PN005 CN350 PN801 6PIN 5PIN 23PIN11PIN24PIN23PIN 14PIN14PIN 30PIN PN103PN104 PN001PN002 PN902PN303 PDM01PDM03 PN105PN302 2-62-7 BLOCK DIAGRAM Audio s/w Bu 4052 ADC CS 5340 Fs = 48kHz Fx DIT CS 8406 (slave) PS 9818 (PWM) Video S/W NJM 2279 out (CVBS-S/W) + Slide S/W Video S/W NJM2279 (Y-S/W) USB Controller ALC BA 3308 CS 5340 ADC DVD BLOCK (ES 6698) Mic Volume : OSD CTL MIC1 MIC2 Optical Tuner AV1 AV2 (option) Monitor Out S-AV Component Scart (option) USB Port MIC 7V Wireless L R V L R V G B R L R L R G B R 8 16 V SW1, SW2,MUTE1 (A) Pb(R) ,Pr(R) CTL-A/B (B) VIDEO-SW (A) Tuner-L/R AV1-L/R AV2-L/R SCART-L/R AV1-CVBS AV2-CVBS Monitor out SCART-CVBS out C Y SCART-ID SCART-FB /RST-AD AD-DATA AD-BCK AD-LRCK (A) SPDIF12.288MHz LRCK BCK ADAT 0,1,2,3 (FL/R,RL/R, C/SW) MUTE TR Mute /RST-AD(A) Mixing ALRCK,ABCK MCLK,AMDAT SPDIF 8406_SDI,8406_SDO 8406_CLK,8406_CE 8406_RST,8406_INT H/P Y(G) Y YY C DVD-CVBS CVB S (A)(T_CE,T_DO,T_DI,T_CLK,T_RDS_DATA,T_RDS,CLK) (A) AUDIO MICOM LC876B48 (PIN MAP ) SS T OPTION FRONT STA510A AMP IC MIC1_DET(A) MIC2_DET(A) (A) HP_DET AM PDN TH_W FAN1 FAN2 (A) FAN1_CTL FAN2_CTL OPTION 2-82-9 SCHEMATIC DIAGRAMS 1. POWER SCHEMATIC DIAGRAM_1 ABCDEFGHIJKLMNOPQRST NOTES) Warning NOTES) Parts that are shaded are critical NOTES) With respect to risk of fire or NOTES) electricial shock. 2-102-11 2. POWER SCHEMATIC DIAGRAM_2 ABCDEFGHIJKLMNOPQRST 2-122-13 3. MICOM SCHEMATIC DIAGRAM ABCDEFGHIJKLMNOPQRST 2-142-15 4. FRONT SCHEMATIC DIAGRAM ABCDEFGHIJKLMNOPQRST 2-162-17 5. DSP&AMP SCHEMATIC DIAGRAM ABCDEFGHIJKLMNOPQRST 2-182-19 6. I/O SCHEMATIC DIAGRAM ABCDEFGHIJKLMNOPQRST 2-202-21 7. MAIN MIC SCHEMATIC DIAGRAM ABCDEFGHIJKLMNOPQRST 2-222-23 PRINTED CIRCUIT BOARD DIAGRAMS 1. MAIN/DVD P.C. BOARD DIAGRAM ( TOP VIEW ) 2-242-25 6870R7505AC 2. MAIN/DVD P.C. BOARD DIAGRAM ( BOTTOM VIEW ) 2-262-27 3. FRONT MIC P.C. BOARD 6870R7507AA 2-282-29 4. SMPS P.C. BOARD LOCATION GUIDE NOTES) Warning NOTES) Parts that are shaded are critical NOTES) With respect to risk of fire or NOTES) electricial shock. 5. JACK P.C. BOARD ( 5 TOOL ) LOCATION GUIDE NOTES) Warning NOTES) Parts that are shaded are critical NOTES) With respect to risk of fire or NOTES) electricial shock. ( 7 TOOL ) ( TOP VIEW ) ( BOTTOM VIEW ) 2-302-31 6. AMP P.C. BOARD ( TOP VIEW )( BOTTOM VIEW ) 3-1 ELECTRICAL TROUBLESHOOTING 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. 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 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 Are 3.3V and 5V DC outputs normal on main PCBA? Update FLASH successfully? Replace FLASH A Is the DC Voltage outputs OK? (-44V, -22V, -26.5V, 12V, 5.6V, 3.3V, 5V, 7V, 8V) 3-3 A , 115. 3-4 B 1. 2. 3-5 C ES6698. ES6698. ES6698. 3-6 D 3-7 E Check connection between IC300 ABCK, ALRCK, ASDAT Check the related circuit of PWM.(Check Audio out Pins52, 54, 55, 59,62, 68 Normal PWM IC out?(IC301) PWM IC received correct data stream? Check Digital Amp circuit (IC701, IC702, IC703, IC704) 3-8 3. AUDIO -COM Circuit(DVD & AMP) YES Does CD/DVD appear at FLD? Does AV1, TV Audio, AV1 opt. and FM 87.5 appear at FLD OK Does Loading appear at FLD? POWER ON YESNO YES Does no Disc or Time appear at FLD? NOYES NO NO NO NO NO NO Does 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 Pin80 is high. Check if IC101 Pin32, 51, 80 are high(5V). Check if IC101 Pin96 is high. Replace IC101. NO NO Check if DVD an Audio Micom Insert is OK. Check Power. YES Check DVD Module. YES Check SMPS. YESYES YES YES YES YES YES 3-9 DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING 1. SYSTEM 27MHz CLOCK,RESET,FLASH R/W SIGNAL 1) ES6698FD main clock is at 27MHz(X501) 3.8V, 27MHz FIG 1-1 2) ES6698FD reset is high active. PWR_CTL(SYSTEM -COM) IC501 PIN83) 5.2VA P