LG DP271, DP271B, LPA-837 Service Manual
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LG DP271, DP271B, LPA-837 Service Manual

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See also: Owner's Manual
http://biz.lgservice.com
PORTABLE DVD
SERVICE MANUAL
MODEL : DP271/DP271B/LPA-837
CAUTION
BEFORE SERVICING THE UNIT, READ THE "SAFETY PRECAUTIONS"
IN THIS MANUAL.
P/NO : AFN33673330
APRIL, 2007

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Summary of Contents for LG DP271, DP271B, LPA-837

  • Page 1 http://biz.lgservice.com PORTABLE DVD SERVICE MANUAL MODEL : DP271/DP271B/LPA-837 CAUTION BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS” IN THIS MANUAL. P/NO : AFN33673330 APRIL, 2007...
  • Page 2 CONTENTS SECTION 1..SUMMARY SECTION 2..EXPLODED VIEWS SECTION 3..ELECTRICAL SECTION 4..REPLACEMENT PARTS LIST...

  • Page 3: Table Of Contents

    SECTION 1 SUMMARY 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: Product Safety Servicing Guidelines For Video Products

    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 completion of repairs.

  • Page 5: Servicing Precautions

    SERVICING PRECAUTIONS CAUTION: Before servicing the PORTABLE DVD covered Electrostatically Sensitive (ES) Devices by this service data and its supplements and addends, read Some semiconductor (solid state) devices can be damaged and follow the SAFETY PRECAUTIONS. NOTE: if easily by static electricity. Such components commonly are unforeseen circumstances create conflict between the called Electrostatically Sensitive (ES) Devices.

  • Page 6: Specifications

    SPECIFICATIONS • DVD PLAYER Power supply DC 12V (AC adapter terminal), DC 7.4V (Battery) Power consumption 12W with battery Weight 190.4g (0.56kg)(without battery pack) External dimensions(W X D X H) (191 X 74 X 39mm) Signal system NTSL Laser Semiconductor laser, wavelength 655nm (DVD), 790nm(CD) Frequency range (audio) DVD linear sound:48kHZ sampling 4HZ to 20kHZ...
  • Page 7 SECTION 2 EXPLODED VIEWS CONTENTS EXPLODED VIEWS .............................2-2 1. CABINET AND MAIN FRAME SECTION ....................2-2 3. PACKING ACCESSORY SECTION......................2-3...

  • Page 8: Exploded Views

    EXPLODED VIEWS 1. CABINET AND MAIN FRAME SECTION...

  • Page 9: Packing Accessory Section

    2. PACKING ACCESSORY SECTION 834 CABLE, CIJAR JACK 806 PLUG ASS'Y 833 ADAPTER 900 REMOTE CONTROL 801 OWNER'S MANUAL 808 BATTERY 802A BOX INNER 804 PACKING SHEET 802 BOX CARTON 803 PACKING...
  • Page 10 SECTION 3 ELECTRICAL CONTENTS LCD PART ..............................3-2 LCD ELECTRICAL TROUBLESHOOTING GUIDE .................3-3 BLOCK DIAGRAM ............................3-5 CIRCUIT DIAGRAM ...........................3-7 PRINTED CIRCUIT DIAGRAM .......................3-9 MAIN PART ...............................3-11 MAIN ELECTRICAL TROUBLESHOOTING GUIDE ..............3-11 1. POWER (DC-DC CONVERTER) CIRCUIT..................3-11 2. MPEG CIRCUIT ...........................3-14 3. RF/SERVO CIRCUIT..........................3-15 DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING .........3-19 1.

  • Page 11: Lcd Part

    LCD PART 1) Power measuring Measure each power after power supply. C902(-) : -10V, C901(+) : +15V, C916(+) : +7.5V, C918(+) : +5VD, C914 : 3.3V 2) VCOM waveform adjustment Adjust the VCOM level while changing the VR901 as below waveform by using the scope in the C921.

  • Page 12: Lcd Electrical Troubleshooting Guide

    LCD ELECTRICAL TROUBLESHOOTING GUIDE Appear shadow form interference in black background Inverter abnormal Display condition? Fuse Replace Fuse normal? IC(U1) Check and Replace IC(U1) normal operate D907, D901, D902 7.5V, 15V, -10V normal? Main B/D on located IC(U901) Check and Replace +5V normal? Check and Replace RGB signal output?
  • Page 13 LCD ELECTRICAL TROUBLESHOOTING GUIDE LCD MODE CONT signal? MAIN B/D Check All “LOW” (Normal condition? TFT LCD pressure voltage? Power source and D901, D902, U901 Check +15V, -14V, +5V Replace TFT LCD normal? Readjust as adjustement standard Color adjusting normal? Replace and Reassemble Each connector? Replace...

  • Page 14: Block Diagram

    BLOCK DIAGRAM...
  • Page 15 MEMO...

  • Page 16: Circuit Diagram

    89P_B PANEL T-CON I/F BAT_OUT 3.3V 3.3V 2,3,4,8 PWRCTL_LCD TO SERVO CON18 CON18 LG & MALATA LG & MALATA LG & MALATA Document Number Document Number Document Number 07.LCD I/F 07.LCD I/F 07.LCD I/F Monday, January 15, 2007 Monday, January 15, 2007...

  • Page 17: Printed Circuit Diagram

    PRINTED CIRCUIT DIAGRAM MEMO (TOP VIEW) (BOTTOM VIEW) 3-10...

  • Page 18: Main Part

    MAIN PART MAIN ELECTRICAL TROUBLESHOOTING GUIDE 1. POWER (DC-DC CONVERTER) CIRCUIT No power on No power on by ADAPTOR by BATTERY Is ADAPTOR Replace ADAPTOR Replace BATTERY BATTERY OK? out 9.5V Replace D606 Is D606 OK. No +18V No +3.3V No +5V No LCD power Is U202...
  • Page 19 MAIN ELECTRICAL TROUBLESHOOTING GUIDE B. AUDIO OUT ABNORMAL C. VIDEO OUT ABNORMAL Audio out abnormal Video out abnormal Check Audio jack & mode Check Video jack & mode Check +9V Check Video signals from MPEG Check signals from MPEG Check IC(U501) Replace IC(U504) Check LC filter D.
  • Page 20 MAIN ELECTRICAL TROUBLESHOOTING GUIDE F. PICTURE ABNORMAL G. DISC ERROR Picture abnormal Disc error Check the disc. Check Disc YES(If OK) Refer to SERVO part Refer to SERVO part YES(If OK) (If OK) Check MPEG_CLK Replace B/D Signal of MPEG part YES(If OK) Check MPEG (IC U201) Replace B/D...

  • Page 21: Mpeg Circuit

    MAIN ELECTRICAL TROUBLESHOOTING GUIDE 2. MPEG CIRCUIT Power is on Does Logo appear Check power & clock. on the screen? Does the Check CD/DVD DSP Is MPEG data Video of the DVD Disc output signal. signal normal? play properly? Check MPEG Decoder input signal.

  • Page 22: Rf/Servo Circuit

    MAIN ELECTRICAL TROUBLESHOOTING GUIDE 3. RF/SERVO CIRCUIT Laser off Put Disc in. Check the related circuit on Proper RFL signal Disc ID is correct? MT1389 RFL signal . on MT1389? Check the RFL connection between J401 and MT1389. Check DMSO related circuit Proper DMSO signal Does spindle rotate.
  • Page 23 MAIN ELECTRICAL TROUBLESHOOTING GUIDE Proper Check connections between Focus on OK. signals on A, B, C, D MT1389 and pick-up head. of MT1389 Check the related circuit Proper FEO signal on MT1389 FEO sugnal. on MT1389. Check IC(U401) Check the related circuit Proper FEO signal Track on OK.
  • Page 24 MAIN ELECTRICAL TROUBLESHOOTING GUIDE Proper Normal Check Aout_L related circuit Aout_L, Aout_R signal Audio output when Aout_R on MTK1389 disc playback. Check the related circuit of Audio DAC. Check Audio filter, amplify, mute circuit. Commu- Normal nications between Check communi cation lines IR.
  • Page 25 MAIN ELECTRICAL TROUBLESHOOTING GUIDE * CHARGEING CIRCUIT No turn on Red LED Is 8.4V of J602_Pin 1 OK? Is L601 OK? Replace L601. Is IC(U601) OK? Replace IC(U601). Is L602 OK? Replace L602. Is U603 OK? Replace IC(U603). 3-18...

  • Page 26: Details And Waveforms On System Test And Debugging

    DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING 1. SYSTEM 27MHz CLOCK, RESET & FLASH R/W SIGNAL 1) MT1379 main clock is at 27MHz (X201) FIG 1-1 2. SDRAM CLOCK 1) MT1389 main clock is at 27MHz (R308) DCLK=125MHz, Vp-p=3.7V U301 PIN38 FIG 2-1 3-19...

  • Page 27: Disc Type Judgement Waveform

    3. DISC TYPE JUDGEMENT WAVEFORM F+(U401 PIN8) FE(U201 PIN26) RFL(U201 PIN21) FIG 3-1 F+(U401 PIN8) FE(U201 PIN26) RFL(U201 PIN21) FIG 3-2 3-20...
  • Page 28 F+(U401 PIN8) FE(U201 PIN26) RFL(U201 PIN21) FIG 3-3 F+(U401 PIN8) FE(U201 PIN26) RFL(U201 PIN21) FIG 3-4 3-21...

  • Page 29: Focus On Waveform

    4. FOCUS ON WAVEFORM FOSO(U401 PIN11) F+(U401 PIN8) F-(U401 PIN9) FIG 4-1 5. SPINDLE CONTROL WAVEFORM (NO DISC CONDITION) DMSO(U401 PIN12) SP-(U401 PIN15) SP+(U401 PIN14) FIG 5-1 3-22...

  • Page 30: Tracking Control Related Signal (System Checking)

    6. TRACKING CONTROL RELATED SIGNAL (SYSTEM CHECKING) TE(U201 PIN27) TRSO(U401 PIN23) T-(U401 PIN18) T+(U401 PIN17) FIG 6-1 TE(U201 PIN27) TRSO(U401 PIN23) T-(U401 PIN18) T+(U401 PIN17) FIG 6-2 3-23...

  • Page 31: Mt1389 Audio Optical And Coaxial Output (Aspdif)

    7. MT1389 AUDIO OPTICAL AND COAXIAL OUTPUT (ASPDIF) ASDIF Vpp=2.5V (U201 PIN208) FIG 7-1 8. MT1389 VIDEO OUTPUT WAVEFORM 1) Full colorbar signal (CVBS) (U501 PIN14) FIG 8-1 3-24...

  • Page 32: Audio Output From Audio Dac

    9. AUDIO OUTPUT FROM AUDIO DAC 1) Audio L/R MR 1kHz 0dB (JK601 PIN4, 5) FIG 9-1 2) Audio related Signal ASDATA3 ASDAT0(IC301 PIN3) ABCK(IC301 PIN4) ALRCK(IC5301 PIN5) FIG 9-2 3-25...

  • Page 33: Wiring Connection Diagrams

    WIRING CONNECTION DIAGRAMS 1. WIRING CONNECTION DIAGRAM 1 (MAIN PCB <---> LCD PCB) MAIN PCB MAIN PCB 3-26...

  • Page 34: Wiring Connection Diagram 2

    2. WIRING CONNECTION DIAGRAM 2 (MAIN PCB <---> KEY PCB) Key PCB MAIN PCB 3-27...

  • Page 35: Block Diagrams

    BLOCK DIAGRAMS 1. OVERALL BLOCK DIAGRAM DQ[0..15] DCLK,DCKE WE#,DQM[0..1] CS#,CAS#,RAS#, BA[0..1], MA[0..11], AD[0..7] PCE#,PRD#,PWR# A[0..21] CKV,PWRCTL_LCD OEH/V,LNR,UND, STVL/R, STHL/R, MOD,89P_R/G/B, VCOMO,CPH1/2/3, BATTERY MECHANISM DECK 3-28...

  • Page 36: Power Block Diagram

    2. POWER BLOCK DIAGRAM 3-29...

  • Page 37: Servo Block Diagram

    3. SERVO BLOCK DIAGRAM 3-30...

  • Page 38: System Block Diagram

    4. SYSTEM BLOCK DIAGRAM 3-31...

  • Page 39: Av Block Diagram

    5. AV BLOCK DIAGRAM 3-32...

  • Page 40: Circuit Diagrams

    0.1uF 100uF/6.3V 100uF/6.3V + CE210 + CE210 Change 620->680 4x1 W/HOUSING 4x1 W/HOUSING C278 C278 R234 R234 C279 C279 LG & MALATA LG & MALATA LG & MALATA 100uF/6.3V 100uF/6.3V 10uF/10V/NC 10uF/10V/NC 10K/NC 10K/NC 10uF/10V/NC 10uF/10V/NC Crystal R233 R233 Document Number...

  • Page 41: Memory Circuit Diagram

    0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 47uF/10V 47uF/10V EEPROM 24C02 EEPROM 24C02 SOP8 SOP8 LG & MALATA LG & MALATA LG & MALATA Document Number Document Number Document Number 03.MEMORY 03.MEMORY 03.MEMORY Monday, January 15, 2007 Monday, January 15, 2007 Monday, January 15, 2007...

  • Page 42: Opu & Motor Circuit Diagram

    100uF/10V/NC J403 J403 4x1 W/HOUSING 4x1 W/HOUSING MDI1 MDI2 CON4_2.0_DIP_B CON4_2.0_DIP_B LG & MALATA LG & MALATA LG & MALATA Document Number Document Number Document Number 04.OPU & MOTOR 04.OPU & MOTOR Monday, January 15, 2007 Monday, January 15, 2007...

  • Page 43: Av Circuit Diagram

    SMBT3904 SMBT3904 SMBT3904 SMBT3904 R541 R541 SP_L- SP_L- SP_L+ SP_L+ SP_R- SP_R- SP_R+ SP_R+ LCD I/F LG & MALATA LG & MALATA LG & MALATA ML_OUT SMBT3904 SMBT3906 ML_OUT MR_OUT MR_OUT Document Number Document Number Document Number 05.AV 05.AV 05.AV...

  • Page 44: Charge Circuit Diagram

    AD_K2 SCLK MPEG I/F C611 C611 C610 C610 0.1uF 0.1uF 0.1uF 0.1uF LG & MALATA LG & MALATA LG & MALATA Document Number Document Number Document Number 06.CHARGE 06.CHARGE 06.CHARGE Monday, January 15, 2007 Monday, January 15, 2007 Monday, January 15, 2007...

  • Page 45: Fm-Tx (Option) Circuit Diagram

    ML_OUT MR_OUT R807 R807 MR_OUT CE801 CE801 100uF/10V 100uF/10V AV I/F Q802 Q802 LG & MALATA LG & MALATA LG & MALATA 2SC3356 2SC3356 Document Number Document Number Document Number 08.FM-TX(OPTION) 08.FM-TX(OPTION) 08.FM-TX(OPTION) Monday, January 15, 2007 Monday, January 15, 2007...

  • Page 46: Panel I/F Circuit Diagram

    C937 PWRCTL_LCD SS5822 SS5822 10uF/16v 10uF/16v Q905 Q905 B_IN R916 R916 SMBT3904 SMBT3904 Q902 Q902 SMBT3904 SMBT3904 LG & MALATA LG & MALATA LG & MALATA R947 R947 10uF/16V 10uF/16V R920 R920 R915 R915 L906 L906 R949 R949 R954 R954...

  • Page 47: Menu Key Circuit Diagram

    8.2K 1% 15K 1% 15K 1% 39K 1% 39K 1% 13K 1% 13K 1% MENU KEY <-> FRONT KEY LG & MALATA LG & MALATA LG & MALATA Document Number Document Number Document Number 10.MENU KEY 10.MENU KEY 10.MENU KEY...

  • Page 48: Front Key Circuit Diagram

    1.2K 1% 1.5K 1% 1.5K 1% 2K 1% 2K 1% 3K 1% 3K 1% CON2 CON2 LG & MALATA LG & MALATA LG & MALATA Document Number Document Number Document Number 11.FRONT KEY 11.FRONT KEY 11.FRONT KEY Monday, January 15, 2007...

  • Page 49: Circuit Voltage Chart

    • CIRCUIT VOLTAGE CHART MODE MODE MODE MODE MODE MODE MODE STOP PLAY STOP PLAY STOP PLAY STOP PLAY STOP PLAY STOP PLAY STOP PLAY PIN NO. PIN NO. PIN NO. PIN NO. PIN NO. PIN NO. PIN NO. 2.85 IC302(MX29LV160) 3.17 2.81...
  • Page 50 MODE MODE MODE MODE MODE MODE STOP PLAY STOP PLAY STOP PLAY STOP PLAY STOP PLAY STOP PLAY PIN NO. PIN NO. PIN NO. PIN NO. PIN NO. PIN NO. U601(FDS4435) Q505 CE202 CE601 10.4 10.4 Emitter CE416 10.4 10.4 Collector CE602 10.4...

  • Page 51: Printed Circuit Diagrams

    PRINTED CIRCUIT DIAGRAMS 1. MAIN P.C.BOARD (TOP VIEW) 3-55 3-56...
  • Page 52 MAIN P.C.BOARD (BOTTOM VIEW) 3-57 3-58...

  • Page 53: Key Menu P.c.board

    2. KEY MENU P.C.BOARD (TOP VIEW) (BOTTOM VIEW) 3. KEY FRONT P.C.BOARD (TOP VIEW) (BOTTOM VIEW) 3-59 3-60...

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