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LG LX-U150X, Service Manual

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LG LX-U150X Service Manual Download Page 17

- 2-10 -

FM(TU101) TROUBLESHOOTING

YES

IC 102 TROUBLESHOOTING

NO

NO

YES

YES

NO

NO

YES

NO

 

YES

NO

YES

YES

YES

NO

YES

YES

NO

Check the 10V input of TU101 Pin 6

Check the "High" of TU101 Pin5

Check the Power input of IC102 pin8

Check the 10V of Q102 "E"

Check the OSC waveform of

TU101 pin8

Refer to "IC102 Troubleshooting"

Check the waveform of IC102 pin16, 17

Check the "LOW" of IC103 

pin7

Replace the Q102

Refer the TU101

Check the Power circuit

Refer to "IC103

Troubleshooting"

Check the waveform of IC102 pin20, 21

IC903,D105,D106 Check

Check the 

FM(TU101) ,AM(L102)

Replace the IC102

Replace the IC103

Check the "LOW" of

IC102 pin13

Refer to "IC103

Troubleshooting"

END

Summary of Contents for LX-U150X

Page 1: ...MODEL LX U150X LXU 150 SERVICE MANUAL MICRO COMPONENT SYSTEM SERVICE MANUAL MODEL LX U150X LXS U150 http biz lgservice com ...

Page 2: ...FORMS OF MAJOR CHECK POINT 2 2 TROUBLESHOOTING 2 5 BLOCK DIAGRAM 2 23 SCHEMATIC DIAGRAMS 2 25 WIRING DIAGRAM 2 33 PRINTED CIRCUIT DIAGRAMS 2 35 INTERNAL BLOCK DIAGRAM OF ICs 2 43 SECTION 3 EXPLODED VIEWS CABINET AND MAIN FRAME SECTION 3 1 SECTION 4 SPEAKER 4 1 SECTION 5 REPLACEMENT PARTS LIST REPLACEMENT PARTS LIST 5 1 CONTENTS ...

Page 3: ...e 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 ca...

Page 4: ...ded 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 1MΩ 6 Care should be taken not to permit the laser pick up to come in contact with clothing in order to prev...

Page 5: ...t 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 conduc tive foam aluminum foil or comparable conductive ma...

Page 6: ...450kHz Signal to noise ratio 35dB Frequency Response 100 1800Hz Output Power 5W 5W AMP T H D 0 5 Frequncy Response 60 20000Hz Signal to noise ratio 60dB Tape Speed 4 75cm sec Wow Flutter 0 3 MTT 111 JIS WTD F F REW time 120sec C 60 TAPE Frequency Response 250 8000 Hz Signal to noise ratio 40dB P B 38dB R P Channel Separation 32dB P B 30dB R P Erase Ratio 50dB MTT 5511 MODEL LXS U150 Type 1Way 1 Sp...

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

Page 8: ...herwise noted 4 Connect low side of signal source and output indicator to chassis ground unless otherwise specified 5 Keep the signal input as low as possible to avoid AGC and AC action TAPE DECK ADJUSTMENT TUNER ADJUSTMENT Item Test Frequency Test Point Adjustment Adjust for Remark DC Voltage FM 98MHz 60dBuV Oscilloscope L104 0V 50mV R145 AM IF AM 603kHz 80dBu Speaker out L103 Maximum Maximum Wav...

Page 9: ...DI PIN 6 DO PIN 4 RESET PIN 14 WRQ 1 MICOM INTERFACE WAVEFORM PN805 PIN 3 4 5 6 during power on 1 MICOM INTERFACE WAVEFORM PN805 PIN 3 4 5 6 during normal play 1 MICOM INTERFACE WAVEFORM PN805 PIN 7 8 9 during power on 1 MICOM INTERFACE WAVEFORM PN805 PIN 7 8 9 during normal play WAVEFORMS OF MAJOR CHECK POINT ...

Page 10: ...RM IC802 PIN 5 13 when focus search 2 SLED DRIVE AND MOTOR WAVEFORM IC802 PIN 5 13 during normal play 3 FOCUS DRIVE AND MOTOR WAVEFORM IC802 PIN 25 IC802 PIN 16 When focus search failed or there is no disc on tray 3 FOCUS DRIVE AND MOTOR WAVEFORM IC802 PIN 25 IC802 PIN 16 There is disc on tray and focus search success ...

Page 11: ...IN 17 TA PIN 6 SPIN PIN 11 SP 5 TRACK DRIVE AND MOTOR WAVEFORM IC802 PIN 22 IC802 PIN 17 during normal play 4 SPINDLE DRIVE AND MOTOR WAVEFORM IC802 PIN 6 11 when TOC reading 6 RF FOCUS AND TRACKING ERROR WAVEFORM IC801 PIN 2 10 16 during normal play ...

Page 12: ...300 PIN 26 Check Check the Fuse Check the DC 6 02V Output of IC902 Check the 5V of Q9011 C CD FUNCTION Replace the fuse Check the DC voltage of CN901 Pin3 4 Replace the Transformer Replace the Transformer Replace the D908 909 910 911 Check the DC voltage of CN901 Pin 8 Pin 9 Replace the D908 909 910 911 Replace the D902 903 Check the High of Q902 B Replace the Q901 Check the High Of CN601 pin7 D92...

Page 13: ... Output of IC701 Pin 8 12 Check the waveform Of D920 Replace ZD902 Check the Signal Output of IC701 pin2 4 Check the DC 10V of IC601 Pin1 Check the DC 9V of IC903 Check the Power Circuit Check the speaker connection Check the High of IC701 pin5 Check the FUNC input Normal Does High appear at Q701 Q702 B MUTE Replace the TR ...

Page 14: ...pin4 25 Check the signal input of IC601 pin6 23 Check the signal input of IC601 pin5 24 IC601 pin12 17 output IC601 pin12 17 output IC601 pin12 17 output CN201 PN201 check IC201 pin4 11 check Check signal input JK602 Check the signal input of CN601 pin 1 3 and refer to CD troubleshooting IC102 pin17 18 check CD TUNER AUX IC601 pin12 17 output ...

Page 15: ...r supplying to IC300 pin11 Low High Refer to Power Circuit Troubleshooting Check the P SENS Replace the X301 Check the RESET circuit Check the power supplying To IC601 pin1 Check the CLK Data of IC601 pin14 15 Check the Control function END Refer to Power Circuit Troubleshooting Check the Data of IC300 pin6 7 CD TAPE FUNCTION Replace the IC201 Check the pattern of IC300 IC601 Refer to IC300 Troubl...

Page 16: ... 17 X104 oscillation Check CE DI DO CLK Check the Operation END Check the High L102 Pin 2 Replace X104 D107 D108 IC902 Check CE Chip Enable DI Data input from Micom DO Data output to Micom CLK Tuner mode clock Check the oscillation the L102 Pin 13 Refer to IC103 Troubleshooting Check the IC102 Troubleshooting Replace to L102 ...

Page 17: ... the 10V of Q102 E Check the OSC waveform of TU101 pin8 Refer to IC102 Troubleshooting Check the waveform of IC102 pin16 17 Check the LOW of IC103 pin7 Replace the Q102 Refer the TU101 Check the Power circuit Refer to IC103 Troubleshooting Check the waveform of IC102 pin20 21 IC903 D105 D106 Check Check the FM TU101 AM L102 Replace the IC102 Replace the IC103 Check the LOW of IC102 pin13 Refer to ...

Page 18: ...al check Pin 4 Pin 11 Check the signal output IC201 Pin 4 Pin 11 PN202 Check SW202 Check Check PN201 Q201 Audio output PN201 Pin 8 Pin 9 Check the oscillation of L201 Check the signal input to PN201 Pin 8 Pin 9 Check Leaf S W B Check R218 L201 L204 Check Head Connector PN202 Check the PN201 Pin 4 Pin 5 ...

Page 19: ...ECK CONNECTOR CHECK CN808 PN305 PN304 PIN 12 LEAF S W VOLTAGE CHECK OPEN 5V CLOSE 2 5V CHECK POWER SUPPLY CIRCUIT PN601 CONNECTOR CHECK CN802 PN601 CHECK MICOM INTERFACE CIRCUIT PN305 CHECK MICOM INTERFACE CIRCUIT PN305 CONNECTOR CHECK PN801 CN802 CHECK PICKUP MOVEMENT CHECK LC78690W IC801 CHECK SA5810 IC802 CONNECTOR CHECK PN601 OK ...

Page 20: ...NNECTOR LOCKING CHECK CN808 CHECK POWER SUPPLY CIRCUIT PN305 PN601 PN305 PIN 12 5V PN601 PIN 7 5V PN305 PIN 13 LEAF S W VOLTAGE CHECK OPEN 5V CLOSE 2 5V IC902 KIA7805 CHECK DEFECTIVE MICOM IC300 PIN 20 LEAF S W VOLTAGE CHECK DEFECTIVE IC300 ...

Page 21: ...5V CHECK MICOM INTERFACE CIRCUIT PN305 PN305 PIN 3 4 5 6 7 8 9 SIGNAL CHECK 14 WRQ 4 RESET 5 DO 5 DI 7 CL 8 CE 9 FSEQ 3 BTL MUTE CHECK THE WAVE FORM 1 DEFECTIVE CONNECTOR OR MAIN POWER SUPPLAY CHECK VOLTAGE THE PIN 2 OF IC806 IC806 PIN2 3 3V CHECK RESET SIGNAL OF PN805 PN805 PIN4 3V DEFECTIVE MICOM OR CONNECTOR DEFECTIVE MICOM OR CONNECTOR DEFECTIVE IC801 DEFECTIVE IC806 ...

Page 22: ...IN 3 4 SL SL CHECK PN801 PIN 13 16 FA FA CHECK PN802 PIN 5 6 SP SP DOES LASER LIGHT CHECK PN801 PIN 10 LD IS READING OK CHECK PN801 PIN 14 15 TA TA DEFECTIVE PICKUP OR IC802 OR IC801 DEFECTIVE PICKUP OR IC802 OR IC801 DEFECTIVE PICKUP OR IC801 DEFECTIVE PICKUP OR IC802 OR IC801 DEFECTIVE PICKUP OR IC802OR IC801 YES YES YES YES NO NO NO NO NO NO NO NO NO NO ...

Page 23: ...S SL WAVEFORM APPEAR AT IC802 PIN 13 AND PN 802 PIN 3 WAVEFORM 2 SLED MOTOR WAVE DOES SLIN WAVEFORM APPEAR AT IC802 PIN 5 WAVEFORM 2 SLED DRIVE WAVE DEFECTIVE IC802 CHECK PN802 CONNECTOR LINE DEFECTIVE PICKUP SLED MOTOR YES NO NO NO NO NO DEFECTIVE PN802 CONNECTOR ...

Page 24: ...T IC802 PIN 16 AND PN801 PIN 13 WAVEFORM 3 FOCUS COIL DRIVE WAVE DOES FAO WAVEFORM APPEAR AT IC802 PIN 25 WAVEFORM 3 FOCUS DRIVE WAVE DEFECTIVE IC801 DEFECTIVE IC802 DEFECTIVE PN801 CONNECTOR DEFECTIVE PICKUP FOCUS ACTUATOR CHECK PN801 CONNECTOR LINE YES NO NO NO NO NO ...

Page 25: ...TAGE CHECK IS 3 3 V APPLIED TO PIN30 36 39 41 61 OF IC801 RF IC SUPPLY VOLTAGE CHECK DEFECTIVE IC804 DEFECTIVE IC801 DEFECTIVE Q801 OR D801 DEFECTIVE PN801 CONNECTOR DEFECTIVE PICKUP LASER PART CHECK PN801 CONNECTOR LINE IS 2 3 V PIN18 OF IC801 LASER CONTROL VOLTAGE CHECK YES YES NO NO NO NO NO NO ...

Page 26: ... IC802 PIN 11 AND PN802 PIN 6 WAVEFORM 4 SPINDLE MOTOR DRIVE WAVE DOES SPIN WAVEFORM APPEAR AT IC802 PIN 6 WAVEFORM 4 SPINDLE DRIVE WAVE DEFECTIVE IC801 DEFECTIVE IC802 DEFECTIVE PN802 CONNECTOR DEFECTIVE PICKUP SPINDLE MOTOR CHECK PN802 CONNECTOR LINE YES NO NO NO NO NO ...

Page 27: ...S TAIN WAVEFORM APPEAR AT IC802 PIN 22 WAVEFORM 5 TRACKING DRIVE WAVE DEFECTIVE IC801 DEFECTIVE IC802 DEFECTIVE PN802 CONNECTOR DEFECTIVE PICKUP OR IC801 DEFECTIVE PICKUP OR IC801 CHECK PN802 CONNECTOR LINE DOES RF SIGNAL APPEAR IC801 PIN 2 WAVEFORM 6 DOES FE TE SIGNAL APPEAR IC801 PORT FE 10 TE 16 WAVEFORM 6 YES YES YES NO NO NO NO NO NO ...

Page 28: ... PLAY AUDIO OUTPUT CHECK OK CONNECTOR CHECK PN305 PN601 PN807 CHECK POWER SUPPLY CIRCUIT PN806 CHECK MICOM INTERFACE CIRCUIT PN805 CHECK PN807 1 PIN 5V CHECK PN810 PIN 2 D 3 D CHECK OTI6888 IC803 CHECK LC78690W IC801 CONNECTOR CHECK PN601 YES YES YES NO NO NO USB PART ...

Page 29: ... 2 22 MEMO ...

Page 30: ... 2 23 2 24 BLOCK DIAGRAM ...

Page 31: ... 2 25 2 26 SCHEMATIC DIAGRAMS MAIN DECK SCHEMATIC DIAGRAM ...

Page 32: ... 2 27 2 28 CD USB SCHEMATIC DIAGRAM ...

Page 33: ... 2 29 2 30 FRONT POWER USB SCHEMATIC DIAGRAM ...

Page 34: ... 2 31 2 32 TUNER SCHEMATIC DIAGRAM ...

Page 35: ... 2 33 2 34 WIRING DIAGRAM ...

Page 36: ... 2 35 2 36 PRINTED CIRCUIT DIAGRAMS FRONT POWER USB P C BOARD Top View FRONT POWER USB P C BOARD Bottom View ...

Page 37: ... 2 37 2 38 MAIN DECK P C BOARD Top View ...

Page 38: ... 2 39 2 40 MAIN DECK P C BOARD Bottom View ...

Page 39: ... 2 41 2 42 CD P C BOARD Top View CD P C BOARD Bottom View ...

Page 40: ...3 COM0 L2 COM2 COM1 PL1 COM1 COM2 PL0 COM0 COM0 PL4 V1 PL5 V2 O_PBMUTE P06 O_FUNCLK P07 O_LOADRDOUT P10 SO0 I_LOADRDIN P11 SI0 SB0 O_LOADRCLK P12 SCK0 O_USB_TX P13 SO1 I_USB_RX P14 SI1 SB1 I_RDSDATA P15 SCK1 O_AMUTE P16 T1PWML I_FSEQ P17 T1PWMH BUZ RES XT1 AN10 XT2 AN11 VSS1 CF1 CF2 VDD1 I_KEY1 P80 AN0 I_KEY2 P81 AN1 I_CDLEAF P82 AN2 I_PBSW P83 AN3 I_RECSW P84 AN4 I_FMST P85 AN5 I_VOLA P86 AN6 I_V...

Page 41: ... 2 44 IC601 TDA7468D 1 BLOCK DIAGRAM ...

Page 42: ... 2 45 2 PIN COFIGURATION ...

Page 43: ... 2 46 IC301 BU1923F 1 BLOCK DIAGRAM 2 PIN COFIGURATION ...

Page 44: ... 2 47 IC102 LA1837 1 BLOCK DIAGRAM 2 TEST CIRCUIT DIAGRAM ...

Page 45: ... 2 48 IC103 LC72131 ...

Page 46: ... 2 49 IC201 AN7312 IC701 LA4631 ...

Page 47: ... VVDD1 DMUTEB PUIN DEFECT FSEQ C2F DVDD DV SS DVDD1 8 VVD D3 VVSS3 SLCO AVDD RCHO LRVSS LRVDD LCHO XVDD XIN XOUT XVSS AMUTEB DOUT DVDD DVSS DVDD1 8 VVSS2 VPDOUT2 VCOC2 VPREF2 VVDD2 CLOCK GENERATOR ERROR CORRECTION SLICE LEVEL CONTROL EFMIN RFOUT LPF PHLPF AIN CIN BIN DIN FEC RFMON VREF JITTC EIN FIN TEC TE TEIN LDD LDS AVSS ATTENUATION CONTROL SERVO CONTROL SUBCODE DECODE CD PLL Synchronization De...

Page 48: ...64 270 450 450 A43 450 450 450 450 A46 450 450 310 259 454 454 450 269 268 287 452 278 289 295 255 253 256 257 258 254 252 251 250 271 305 T901 277 277 276 291 A49 275 290 288 A41 455 451 280 281 282 283 284 285 450 294 A45 CABINET AND MAIN FRAME SECTION SECTION 3 EXPLODED VIEWS NOTE Refer to SECTION 5 REPLACEMENT PARTS LIST in order to look for the part number of each part ...

Page 49: ... 3 3 3 4 MEMO MEMO ...

Page 50: ... 4 1 MODEL LXS U150 SECTION 4 SPEAKER SECTION 850 ...

Page 51: ... 4 2 MEMO ...

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