LG DP450G, Service Manual

Page 1: ...VD SERVICE MANUAL CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL Website http biz lgservice com Internal Use Only P NO AFN73065026 MARCH 2009 MODEL DP450G MODEL DP450G SERVICE MANUAL ...

Page 2: ...1 1 CONTENTS SECTION 1 SUMMARY SECTION 2 EXPLODED VIEWS SECTION 3 ELECTRICAL SECTION 4 REPLACEMENT PARTS LIST ...

Page 3: ...MMARY CONTENTS PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS 1 3 SERVICING PRECAUTIONS 1 4 GENERAL SERVICING PRECAUTIONS INSULATION CHECKING PRODEDURE ELECTROSTATICALLY SENSITIVE ES DEVICES SPECIFICATIONS 1 5 ...

Page 4: ...not been defeated 3 Soldering must be inspected to discover possible cold solder joints solder splashes or sharp solder points Be certain to remove all loose foreign particles 4 Check for physical evidence of damage or deterioration to parts and co ponents for frayed leads or damaged insulation including the AC cord and replace if necessary 5 No lead or component should touch a high current device...

Page 5: ...cluding Metal pan els Input terminals Earphone jacks etc Electrostatically Sensitive ES Devices Some semiconductor solid state devices can be damaged easily by static electricity Such components commonly are called Electrostatically Sensitive ES Devices Examples of typical ES devices are integrated circuits and some field effect transistors and semiconductor chip components The following technique...

Page 6: ... humidity 5 to 90 Laser Semiconductor laser Signal system PAL Connectors Audio Video Output ø3 5mm mini jack x 1 Video 1 0V p p 75Ω sync negative Audio 1 5Vrms 1kHz 0dB Earphone terminal ø3 5mm stereo mini jack x 1 Liquid Crystal Display Panel size 7 inches wide diagonal Projection system R G B stripe Driving system TFT active matrix Resolution 480 x 234 WQVGA SPECIFICATIONS ...

Page 7: ...1 6 ...

Page 8: ...2 1 EXPLODED VIEWS 2 2 1 CABINET AND MAIN FRAME SECTION 2 2 2 PACKING ACCESSORY SECTION 2 3 SECTION 2 EXPLODED VIEWS CONTENTS ...

Page 9: ...266 268 476 A48 B A LCD BOARD 277 277 476 476 A51 A40 A52 LCD PANEL CABLE2 CABLE1 250 252 475 477 475 477 254 254 253 251 476 E D C 269 270 F 809 476 CABLE3 A00 269 A46 MAIN BOARD E C A D B F G 474 271 273 272 273 474 275 273 474 A44 274 EXPLODED VIEWS 1 CABINET AND MAIN FRAME SECTION ...

Page 10: ...PACKING ACCESSORY SECTION PLUG ASS Y RCA CABLE 806 834 POWER CORD 300 SET BOX 802 ACC BOX 802A 808 BATTERY 801 OWNER S MANUAL CABLE CIGAR JACK 804 PACKING SHEET 803 PACKING REMOTE CONTROL 900 839 CARRING CASE ...

Page 11: ...2 4 ...

Page 12: ...19 3 MT1389 VIDEO OUTPUT WAVEFORM 3 20 4 AUDIO OUTPUT FROM AUDIO DAC 3 20 BLOCK DIAGRAMS 3 21 1 OVERALL BLOCK DIAGRAM 3 21 2 POWER BLOCK DIAGRAM 3 22 3 SERVO BLOCK DIAGRAM 3 23 4 SYSTEM BLOCK DIAGRAM 3 24 5 A V BLOCK DIAGRAM 3 25 CIRCUIT DIAGRAMS 3 27 1 MPEG CIRCUIT DIAGRAM 3 27 2 MEMORY CIRCUIT DIAGRAM 3 29 3 OPU MOTOR CIRCUIT DIAGRAM 3 31 4 AV CIRCUIT DIAGRAM 3 33 5 CHARGE CIRCUIT DIAGRAM 3 35 6...

Page 13: ... G B signal output VCOM signal Vip 4 5 LCD MODE CONT signal All LOW Normal condition TFT LCD pressure voltage 3 3V 5V 15V 10V TFT LCD normal Color adjusting normal Each connector END Replace Replace and Reassemble Readjust as adjustement standard Replace Power source and L909 L1 D1 D2 check MAIN B D Check IC U1 Check and Replace Check and Replace MPEG1389LP Pin107 108 109 IC U2 Check and Replace D...

Page 14: ...TC3308 IC Connector Main interface VCOM BLOCK LCD POWER BLOCK R G B Circuit BLOCK LCD PANEL SPEAK KEY INVERTER POWER BLOCK BACKLIGHT KEYPAD BLOCK IR AD_K DVD_KE Y1 DVD_KE Y2 DVD_KE Y3 ROUT GOUT BOUT VIN_6 12V PWRCTL_LCD MP2359 IC VGH 15V VGL 10V 7 5V 5V VGH VGL STVR STVL CKV UND OEV VCOMO LNR MOD OEH STHL STHR CPH3 CPH2 CPH1 89P_R 89P_G 89P_B SP L SP L SP R SP R RCR2561 IC ...

Page 15: ...pF C47 100pF R23 100 R23 100 CN2 CON12_1 0MM CN2 CON12_1 0MM 10 9 8 7 6 5 4 3 2 1 11 12 13 14 R964 50 R964 50 R965 50 R965 50 U1 UTC3308 U1 UTC3308 A OUT 1 A IN 2 A IN 3 GND 4 B IN 5 B IN 6 B OUT 7 V 8 C56 102pF C56 102pF CN3 CON10_1 0MM CN3 CON10_1 0MM 10 9 8 7 6 5 4 3 2 1 11 12 C9 105 C9 105 TP1 TP1 R963 50 R963 50 R947 270K R947 270K R16 430 270 R16 430 270 D1 D_15V D1 D_15V 1 2 L5 4 7uH L5 4 7...

Page 16: ...PRINTED CIRCUIT BOARD DIAGRAMS TOP VIEW 3 7 3 8 BOTTOM VIEW ...

Page 17: ...3 9 3 10 ...

Page 18: ...ES YES YES YES Is ADAPTOR out 12V Is D606 OK Is BATTERY OK Replace ADAPTOR Replace D606 No 12V Replace U401 Is U202 1 8V OK Replace U202 Replace U202 Is Q402 5V OK Replace U401 Replace U401 Is U401 3 3V OK VCOM signal Vip 4 5 Is U401 5V OK Is U401 5V OK No LCD_3 3V No S3 3V No A 5V No M5V VCC_5V No 5VA Replace BATTERY No power on by ADAPTOR No power on by BATTERY ...

Page 19: ...eck Audio jack mode Check A 5V Check signals from MPEG Replace IC U502 YES YES YES YES E PICTURE ABNORMAL Picture abnormal Check the disc Refer to SERVO part Check DCLK signal of MPEG part Check MPEG IC U201 Replace B D YES YES YES YES YES D VIDEO OUT ABNORMAL Video out abnormal Check Video jack mode Check A 5V Check signals from MPEG Check IC U502 YES YES YES YES ...

Page 20: ...3 13 MAIN ELECTRICAL TROUBLESHOOTING GUIDE G OPEN CLOSE ABNORMAL OPEN CLOSE abnormal Check SW201 switch Check the connectin of MD Refer to SERVO part YES YES NO YES YES Check IC U201 Pin92 ...

Page 21: ...MPEG Decoder input signal Check MPEG Decoder input signal YES YES YES YES NO NO NO NO YES OK NO NO NO NO NO YES YES YES YES OK YES OK Does the Video of the DVD Disc play properly Does the Video of the video CD play properly Does the audio sound output normally Does logo appear on the screen Is MPEG data signal normal Is MPEG data signal normal Does the audio signal output from MPEG decoder Is cloc...

Page 22: ...t on MT1389 RFL signal Check DMSO related circuit on MT1389 Check the RFL connection between J401 and MT1389 Check the cable connection between spindle and main PCBA YES YES YES YES NO NO NO NO NO YES YES Disc ID is correct Does spindle rotate A Put Disc in Proper RFL signal on MT1389 Proper DMSO signal on MT1389 ...

Page 23: ... Check connections between MT1389 and pick up head Check the related circuit on MT1389 Check IC U401 Check cable connection on pick up head Check RF signal waveform YES YES YES YES NO NO NO NO NO NO NO NO YES YES YES YES YES Focus on OK Track on OK Disc is play Proper FEO signal on MT1389 Properly TRSO signal on MT1389 T Toutput properly Proper signals on A B C D of MT1389 Proper FEO signal on MT1...

Page 24: ... lines on MT1389 Check Audio filter amplify mute circuit Check the cable connection on Front pannel TEST END YES YES YES NO NO NO NO NO YES YES Normal Audio output when disc playback Normal IR VFD Front pannel key functions Proper Aout_L Aout_R signal on MTK1389 Commun ications between IR VFD Front pannel key MT1389 Front μ com is normally ...

Page 25: ...TROUBLESHOOTING GUIDE 4 CHARGING CIRCUIT Is 8 4V of J601_Pin3 OK NO YES No turn on Red LED Replace IC U601 NO YES Is IC U601 OK Replace L601 NO YES Is L601 OK Replace L602 Replace IC U603 Is IC U603 OK NO NO YES Is L602 OK ...

Page 26: ...3 19 DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING FIG 1 1 1 SYSTEM 27MHz CLOCK 1 MT1389L main clock is at 27MHz Y201 1 FIG 2 1 2 SDRAM CLOCK 1 MT1389 main clock is at 27MHz R303 ...

Page 27: ...3 20 FIG 3 1 3 MT1389 VIDEO OUTPUT WAVEFORM 1 Full colorbar signal CVBS FIG 4 1 4 AUDIO OUTPUT FROM AUDIO DAC ...

Page 28: ...I KEY IR GT6312 5VA 1 8V 3 3V VOLU ME CVBS MT1389DE LP MPEG R5460214AC SM9926 B BC KEY DVD_KEY1 DVD_KEY2 DVD_KEY3 A 5V IR_OUT SL SL AM5898N MOTOR DRIVER STANDBY PWM AD_PR P 5VA 1 8V BAT_OUT RED GREEN AOUT_L R AD_K 64MBit SDRAM MA 0 11 BA 0 1 CS CAS RAS WE DQM 0 1 DCLK DCKE 16M FLASH MEMORY SF_DO SF_CS SF_CK SF_DI REMOCON RECEIVER Power Charge LED 3 3V 3 3V OPO V1P4 FOSO TRSO FMSO DMSO STBY LCD PAN...

Page 29: ...W 12V i n Charge Ena ble Charge Thermister Divide Divide DC Sense BAT Sense DC DC AM5898N Reg 5VA 3 3V 1 8V S W S W A 5V Standby LCD Panel Video Audio System Servo A 5V Battery out 3 3V 1 8V LCD Vcc 7 5V 15V 10V DV 7 5V 15V 10V 5VD A 5V M5V Charge Discharge RCR 2561 GT6312 REMOCON RECEIVER 5VA ...

Page 30: ...r Driver DVD A B C D RF CD A B C D E F RF PICK UP Y201 U201 MTK1389DE LP P DVDPLAYER ONE CHIP FMSO DMSO FOSO TRSO STBY V1P4 FO FO TR TR 27MHz X TAL CDLD LD01 DVDLD LD02 IOA LIMIT ALPC MDI1 MDI2 Spindle Moter SL SL Steppi ng Moter OP OP OPO SP SP ...

Page 31: ...CKE 16 32MBit FLASH MEMORY SF_CS SF_DI SF_CK 27MHz 5VA REMOCON RECEIVER KEY1 LCD MODE DISPLAY SETUP MENU UP DOWN LEFT RIGHT ENTER Power Charge LED KEY2 AD_KEY 3 3V 3 3V 2 14 2 8 16 64Mbit 1 8V 3 3V MT1389DE LP MPEG POWER PLAY PAUSE REW FF STOP COLOR BRIGHT DVD_K1 DVD_K2 DVD_K3 IR RED GREEN System AV Part SF_DO ...

Page 32: ...R AOUT_L R 2CH DAC MT1389DE LP MPEG VIDEO 1 8V 3 3V CVBS AUDIO PT2303 SPK SPK A 5V SP_L L H P JACK SP_L R A_MUTE_SW NJM4580M OP AMP 12V AV OUT SP_MUTE ML_OUT MR_OUT SDA SCL VOLUME System AV Part VIDEO ADC GT6312 H P JACK SP_L R 5VA ...

Page 33: ...3 26 ...

Page 34: ...6 0 1uF R225 3 3K R225 3 3K L214 10uH L214 10uH CE201 100uF 6 3V CE201 100uF 6 3V 1 2 R201 100K R201 100K C203 0 1uF C203 0 1uF R218 10K R218 10K CE207 47uF 6 3v CE207 47uF 6 3v 1 2 L207 FB 1206 L207 FB 1206 MT1389LP U201 MT1389L SMD LQFP 128 MT1389LP U201 MT1389L SMD LQFP 128 RFA 1 RFB 2 RFC 3 RFD 4 RFE 5 RFF 6 AVDD18_2 7 AVDD33_1 8 XTALI 9 XTALO 10 AGND33 11 V20 12 V14 13 REXT 14 MDI1 15 MDI2 16...

Page 35: ...0 1uF C306 0 1uF U302 AT26DF161 U302 AT26DF161 CS 1 DO 2 WP 3 VSS 4 DI 5 CLK 6 HOLD 7 VCC 8 R315 300 R315 300 RN301 33x4 100x4 RN301 33x4 100x4 1 8 2 7 3 6 4 5 CE301 47uF 10V CE301 47uF 10V 1 2 C309 0 1uF C309 0 1uF C308 0 1uF C308 0 1uF R311 10K R311 10K C307 0 1uF C307 0 1uF C303 0 1uF C303 0 1uF C302 0 1uF C302 0 1uF C311 22P 33P C311 22P 33P L301 FB 50 L301 FB 50 C310 0 1uF C310 0 1uF R304 33 ...

Page 36: ...1 2 C416 68pF C416 68pF R459 100K R459 100K R411 1 2K 1 R411 1 2K 1 CE410 220uF 16V CE410 220uF 16V 1 2 L412 47UH L412 47UH C419 1000pF C419 1000pF C402 2200pF NC C402 2200pF NC R449 150K NC R449 150K NC R455 0 R455 0 C415 1000pF C415 1000pF L416 10uH L416 10uH R422 6 8K R422 6 8K R424 4 7 R424 4 7 CE403 47uF 10V CE403 47uF 10V 1 2 R406 150K NC R406 150K NC C414 0 1uF C414 0 1uF C436 NC C436 NC CE...

Page 37: ...52 100K R552 100K L507 0603 10uH L507 0603 10uH C523 ESD 15pF C523 ESD 15pF R521 47K R521 47K TP502 TP502 R529 4 7K R529 4 7K R512 4 7K R512 4 7K C511 NC C511 NC C513 680pF 103 C513 680pF 103 PT2303 U502 PT2303 PT2303 U502 PT2303 Shutdown 1 GND1 2 IN2 9 VDD 4 IN2 11 IN1 6 GND2 7 IN1 8 OUT2 14 VREF 10 OUT2 12 HP IN 16 VDD 13 OUT1 5 GND3 15 OUT1 3 C B E 4 7K 2 1 3 Q805 DTC343TK C B E 4 7K 2 1 3 Q805...

Page 38: ...44 10K R617 0 15 1W R617 0 15 1W TP614 TP614 R642 1K R642 1K L602 33UH L602 33UH TP607 TP607 R245 47K R245 47K C618 0 1uF C618 0 1uF D603 LL4148 D603 LL4148 1 2 FB5 50R FB5 50R IR G VCC IR1 R24FV1A DIP IR G VCC IR1 R24FV1A DIP 1 2 3 C631 0 1uF C631 0 1uF R625 3 6K R625 3 6K R632 330 R632 330 C634 0 1uF C634 0 1uF R608 10K 1 R608 10K 1 R616 51 R616 51 TP611 TP611 TP609 TP609 OFF ON SW206 SSSS811101...

Page 39: ...600 C704 33P C704 33P R714 33 600 EMC R714 33 600 EMC R712 33 600 EMC R712 33 600 EMC L707 FB 600 L707 FB 600 C703 33P C703 33P J702 CON10_1 0MM J702 CON10_1 0MM 10 9 8 7 6 5 4 3 2 1 11 12 C705 33P C705 33P C706 33P C706 33P J701 CON12_1 0MM J701 CON12_1 0MM 10 9 8 7 6 5 4 3 2 1 11 12 13 14 R710 33 600 EMC R710 33 600 EMC L706 FB 600 L706 FB 600 L702 FB 600 L702 FB 600 CE702 47uF 25V CE702 47uF 25...

Page 40: ...04 2K 1 R804 2K 1 K805PRE K805PRE 1 2 C802 ESD 15pF C802 ESD 15pF K807 DOWN K807 DOWN 1 2 C10 0 1uF C10 0 1uF R805 2 7K 1 R805 2 7K 1 K801PLAY PLAUSE K801PLAY PLAUSE 1 2 C804 ESD 15pF C804 ESD 15pF K808 RIGHT K808 RIGHT 1 2 R810 51K R810 51K J801 CON8_1 0MM J801 CON8_1 0MM 1 2 3 4 5 6 7 8 9 10 K813 UP K813 UP 1 2 R806 4 7K 1 R806 4 7K 1 K804NEXT K804NEXT 1 2 C805 ESD 15pF C805 ESD 15pF K809 LEFT K...

Page 41: ...8 0 0 29 1 05 1 48 30 1 52 0 31 1 59 0 32 1 12 1 12 33 0 05 0 06 34 0 05 0 08 35 0 01 0 04 36 0 01 0 37 3 33 3 33 38 1 60 1 60 39 2 82 2 40 40 0 0 41 0 0 42 0 92 1 19 43 3 33 3 33 44 0 99 1 07 45 0 89 1 12 46 0 0 47 1 07 1 17 48 1 03 1 38 49 3 33 0 50 0 1 55 51 1 64 1 37 52 0 0 53 0 1 1 04 54 0 0 U401 AM5898N 1 0 2 40 2 1 29 1 28 3 1 26 1 27 4 0 01 0 5 9 92 9 89 6 9 94 9 91 7 9 94 9 91 8 0 2 21 9 ...

Page 42: ... 0 0 CE207 3 33 3 32 0 0 CE208 1 87 1 87 0 0 CE209 3 33 3 33 0 0 CE211 3 33 3 32 0 0 CE212 3 26 3 26 0 0 CE213 3 33 3 33 0 0 CE301 3 33 3 33 0 0 CE402 5 07 4 98 0 0 CE403 5 07 5 00 0 0 CE406 5 06 5 00 0 0 CE410 3 39 3 38 0 0 CE411 9 80 9 71 0 0 CE412 5 06 5 04 0 0 CE413 9 80 9 71 0 0 CE415 3 37 3 36 0 0 CE416 5 15 4 99 0 0 CE417 3 34 3 33 3 34 3 33 CE418 MODE PIN NO STOP PLAY 3 34 3 33 3 34 3 33 C...

Page 43: ...3 45 3 46 PRINTED CIRCUIT BOARD DIAGRAMS 1 MAIN P C BOARD TOP VIEW ...

Page 44: ...3 47 3 48 MAIN P C BOARD BOTTOM VIEW ...

Page 45: ...3 49 3 50 2 KEY P C BOARD TOP VIEW BOTTOM VIEW ...