LG DP372 Service Manual
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LG DP372, 3-39 3-40 7. AUDIO CIRCUIT DIAGRAM SCL FM_MUTE ML_OUT MR_OUT GND 3.3V MR_OUT SDA SCL FM_MUTE ML_OUT ANT FM+3.3VFM+3.3V SDA ANT 3.3V FM+3.3V FM+3.3V GND 2,3,4,5,6,7 3.3V 2,3,4 MR_OUT 5 FM_MUTE 2 SCL 2,3 SDA 2,3 ML_OUT 5 C SMBT3906 1 2 EB 3 2 D AF2301P 1 SG 3 H:FM L:FM EMC EMC POWER I/F OFF-PAGE CONNECTION MPEG I/F AV I/F R809 3K R809 3K L802 220nH(NC/EMC) L802 220nH(NC/EMC) C811 104 C811 104 C820 39pF(15P/EMC) C820 39pF(15P/EMC) C815 474C815 474 Q801 BFG540W/X Q801 BFG540W/X C 1 E 2 B 3 E 4 L801 FB L801 FB C816
LG DP372, 3-12 Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only SDCLK DCAS# BA1 DRAS# BA0 CAS# WE# DCLK RAS# DBA0 DBA1 DWE# DQM1 DRAS# SDCKE DCAS# DCS# DWE# SDCLK DQM0 EMC R303 150/200 EM C R303 150/200 EMC R305 33/150(EMC) R305 33/150(EMC) RN301 33x4 RN301 33x4 1 8 2 7 3 6 4 5 R304 33/150(EMC) R304 33/150(EMC) CLK 38 CKE 37 CS 19 RAS 18 CAS 17 WE 16 DQML 15 DQMH 39 NC1 36 NC2 40 VSS 54 VSS 41 VSS 28 2. SDRAM CLOCK 3. TRAY OPEN/CLOSE SIGNAL FIG 2-1 7 TRIN DV33 L211L211 R218 10K R218 10K C234 0.1uF C234 0.1uF SW201 SW212 SW201 SW212 1 4 2 3 SW202 SW212 SW202 SW212 1 4 2 3 FIG 3-1 8 8 7 DCL
3-21 Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 2. POWER BLOCK DIAGRAM Battery Charge Circuit BAT Con AC/DC Adapter 12V 12V in in BAT BAT ou ou t FET SW SW (12 (12 V in in ) Cha Cha rge rge E E na na ble ble Cha Cha rge rge The The rmi rmi st st e
LG DP372, 3-4 Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 3. SYSTEM TEST FLOW TEST Replace power PCBA or AC transformer. YES NO Switch on the power PCBA Repair or Replace power PCBA YES NO Make sure the main PCBA don't short on VCCs and switch it on. YES Check the regulators or related diodes. YES NO Connect to PC RS232 cable and update the FLASH memory code. 1. Check 27MHz system clock. 2. Check system reset circuit. 3. Check FLASH R/W enable signal PRD, RWR. 4. Check RS232 SIGNALS. 5. Check FLASH Memory related circuit. NO A YES Check the AC voltage power PCBA (110V or 220V) Update FLASH successfully? Is the DC volta
LG DP372, 3-17 Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only A+5V <--> C504 56pF-102(EMC) C504 56pF-102(EMC) Q509 BAT54S Q509 BAT54S 3 2 1 R524 10 R524 10 C522 ESD(15pF/56P) C522 ESD(15pF/56P) J510 PJ-3513B-3531 J510 PJ-3513B-3531 1 1 2 2 3 3 4 4 5 5 6 6 C526 56pF-102(EMC) C526 56pF-102(EMC) 9. 1389DE/LP VIDEO OUTPUT WAVEFORM 10. AUDIO OUTPUT FROM 1389DE/LP FIG 9-1 24 FIG 10-1 25 24 A+5V <--> C504 56pF-102(EMC) C504 56pF-102(EMC) Q509 BAT54S Q509 BAT54S 3 2 1 R524 10 R524 10 C522 ESD(15pF/56P) C522 ESD(15pF/56P) J510 PJ-3513B-3531 J510 PJ-3513B-3531 1 1 2 2 3 3 4 4 5 5
LG DP372, 3-22 Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 3. SERVO BLOCK DIAGRAM U401 AM5898N Motor 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-TA L CDLD(LD01),DVDLD(LD02) IOA LIMIT ALPC MDI1,MDI2 Spi Spi ndle dle Mo Mo ter SL-,SL+ Steppi Steppi ng ng Mo Mo ter OP+,OP- OP O SP-,SP+
LG DP372, 1-2 Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only SECTION 1 SUMMARY CONTENTS PRODUCT SAFETY SERVICING GUIDELINES FOR PORTABLE DVD PRODUCTS.........1-3 SERVICING PRECAUTIONS....................................................................................................................1-4 • GENERAL SERVICING PRECAUTIONS • INSULATION CHECKING PRODEDURE • ELECTROSTATICALLY SENSITIVE (ES) DEVICES SPECIFICATIONS .......................................................................................................................................
LG DP372, 1-3 Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only PRODUCT SAFETY SERVICING GUIDELINES FOR PORTABLE DVD PRODUCTS IMPORTANT SAFETY NOTICE This manual was prepared for use only by properly trained audio-video service tech- nicians. When servicing this product, under no circumstances should the original design be modified or altered without permission from LG Corporation. All components should be replaced only with types identical to those in the original circuit and their physical location, wiring and lead dress must conform to original layout upon completi
LG DP372, 3-27 3-28 CIRCUIT DIAGRAMS 1. MPEG CIRCUIT DIAGRAM RFV18-2 IOA TRIN IR_OUT XO STBY FMO DVD_KEY1 DVD_KEY3 DVD_KEY2 DVD_KEY4 DVD_KEY5 VCOMO OEV LDO1 OP- RFVDD3 AVCM MA3 IR_OUT AVDD33 OP+ LIMIT V20 MA1 TRO FOO V1P4 FMO DMO FOSOFOSOFOSOFOSOFOSOFOSO TRSOTRSOTRSOTRSOTRSOTRSO DMSODMSODMSODMSODMSODMSO FMSOFMSOFMSOFMSO TRIN MA0 TXD VCC_5V RFO FS RXD MA10 SDA1 DVD_KEY4 BA1 BA0 D A B C RAS# STVL AADVDD CAS# CKV OPO RFV18-1 WE# AADVDD MA4 MA11 APLLVDD3 MA5 DCLK V20 DQM1 MA6 MA7 SF_CS SF_DI SF_DO SF_CK URST# SF_C S SF_D O SF_D I DACVDD3 LDO2 TXD RXD RFV18-1 RFV18-2 V1P4 C LDO1 D LDO2 STBY E V1P4 F RFO DMSO TRSO FOSO FMSO I
LG DP372, 3-1 Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only SECTION 3 ELECTRICAL CONTENTS ELECTRICAL TROUBLESHOOTING GUIDE ...................................................................................3-2 1. POWER CHECK FLOW.........................................................................................................................3-2 2. SYSTEM OPERATION FLOW ...............................................................................................................3-3 3. SYSTEM TEST FLOW ................
LG DP372, 3-8 Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only NO NO YES YES Check connections between 1389DE/LP and pick-up head. Check cable connection on pick-up head. NO YES YES YES YES YES Check cable connection on pick-up head. Check RF signal waveform. Focus on OK? Proper signals on A,B,C,D of 1389DE/LP NO NO Check the TRD connection on 1389DE/LP and motor driver Track on OK? Disc is play? Properly TRD signal on 1389DE/LP? NO Check the tracking con
LG DP372, 3-7 Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only NO NO YES YES Check the laser power circuit on 1389DE/LP and connecting to power transistor. Check cable connection between transistor output and pick-up head NO Laser off NO NO YES Check the related circuit on RF signal. Check DVD_LD & CD_LD signal YES YES NO NO YES Check SPD_PWM related circuit on 1389DE/LP. YES Check the cable connection between spindle and main PCBA. YES
LG DP372, 2-3 Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 2. PACKING ACCESSORY SECTION PLUG ASS'Y(RCA CABLE) 806 BATTERY 808 834 ADAPTER 833 REMOTE CONTROL 900 MASTER BOX 802 BOX 802B BOX 802A 801 OWNER'S MANUAL CABLE, CIGAR JACK 804 PACKING SHEET 803 BAG 835 CAR-MOUNT
LG DP372, 3-9 Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only NO NO YES YES Check connection between 1389DE/LP & audio AMP. Check audio filter, amplify, mute circuit. NO NO YES Check communication lines on 1389DE/LP. YES YES TEST END Check the cable connection on front panel. Normal audio output when disc playback? Audio AMP received correct data stream? Commu- nications between IR.VFD front panel key & 1389DE/LP is normally? Normal IR.VFD & F
LG DP372, 1-4 Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only SERVICING PRECAUTIONS CAUTION: Before servicing the PORTABLE DVD covered by this service data and its supplements and addends, read and follow the SAFETY PRECAUTIONS. NOTE: if unforeseen cir- cumstances create conflict between the following servicing precautions and any of the safety precautions in this publica- tion, always follow the safety precautions. Remember Safety First : General Servicing Precautions 1. Always unplug the PORTABLE DVD AC power cord from the AC power source before:
1-5 Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only SPECIFICATIONS • DVD PLAYER Power requirements DC 12V Power consumption 12W External dimensions 207 x 39 x 168mm (W x H x D) Net weight (Approx.) 0.85kg Operating temperature 5°C to 40°C Operating humidity 5% to 90% Laser semiconductor laser Signal system
3-18 WIRING CONNECTION DIAGRAMS Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 1. WIRING CONNECTION DIAGRAM-1 (MAIN PCB <---> LCD & INVERTOR PCB) MAIMAIN PCBCB LCDLCD PCB INVERTOR PCB
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