LG LGDVP7772 Service Manual
  1. Manuals
  2. Brands
  3. LG Manuals
  4. Portable DVD Player
  5. LGDVP7772
  6. Service manual
LG LGDVP7772 Service Manual

LG LGDVP7772 Service Manual

Wide display portable dvd player
Hide thumbs Also See for LGDVP7772:

Advertisement

Table of Contents

All manuals and user guides at all-guides.com
CONTENTS
SECTION 1 . . . . SUMMARY
SECTION 2 . . . . EXPLODED VIEWS
SECTION 3 . . . . ELECTRICAL
SECTION 4 . . . . REPLACEMENT PARTS LIST
1-1

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the LGDVP7772 and is the answer not in the manual?

Questions and answers

Related Manuals for LG LGDVP7772

Summary of Contents for LG LGDVP7772

  • Page 1 All manuals and user guides at all-guides.com CONTENTS SECTION 1 ..SUMMARY SECTION 2 ..EXPLODED VIEWS SECTION 3 ..ELECTRICAL SECTION 4 ..REPLACEMENT PARTS LIST...
  • Page 2 All manuals and user guides at all-guides.com SECTION 1 SUMMARY CONTENTS PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS ..... 1-3 SERVICING PRECAUTIONS ....................1-4 SPECIFICATIONS ........................1-5...
  • Page 3 All manuals and user guides at all-guides.com PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS CAUTION : DO NOT ATTEMPT TO MODIFY THIS PRODUCT IN ANY WAY, SUBJECT : X-RADIATION NEVER PERFORM CUSTOMIZED INSTALLATIONS WITHOUT MANUFAC- 1. BE SURE PROCEDURES AND INSTRUCTIONS TO ALL SERVICE PER- TURER’S APPROVAL.
  • Page 4 All manuals and user guides at all-guides.com 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 unfore- easily by static electricity.
  • Page 5 All manuals and user guides at all-guides.com SPECIFICATIONS [DVD player] Power supply DC 9.8 V (AC adapter terminal), DC 7.4 V (Battery) Power consumption 25 W with battery Weight 12.6 lbs (0.66 kg) (without battery pack) External dimensions (W X D X H) 7.3 x 5.9 x 1.0 inches (186 x 150 x 25 mm) Signal system Laser...
  • Page 6 All manuals and user guides at all-guides.com SECTION 2 EXPLODED VIEWS CONTENTS EXPLODED VIEWS ........................2-2 Cabinet and Main Frame Section ....................2-2 Deck Mechanism Section ......................2-3 Packing Accessory Section .......................2-4...

  • Page 7: Exploded Views

    All manuals and user guides at all-guides.com EXPLODED VIEWS • Cabinet and Main Frame Section...

  • Page 8: Deck Mechanism Section

    All manuals and user guides at all-guides.com • Deck Mechanism Section...

  • Page 9: Packing Accessory Section

    All manuals and user guides at all-guides.com • Packing Accessory Section 831 ADAPTER DC DC 12 830 AC ADAPTER BATTERY 300 POWER CORD REMOCON 814 PLUG ASS’Y OWNER’S MANUAL R/C BATTERY PACKING SHEET PACKING PACKING BOX CARTONX OPTIONAL PARTS...
  • Page 10 All manuals and user guides at all-guides.com SECTION 3 ELECTRICAL CONTENTS LCD PART ........................3-2 ELECTRICAL TROUBLE SHOOTING GUIDE ............3-16 BLCOK DIAGRAMS ....................3-25 CIRCUIT DIAGRAM ....................3-28 PRINTED CIRCUIT DIAGRAMS ................3-58...
  • Page 11 All manuals and user guides at all-guides.com LCD PART 1) Power measuring Measure each power after power supply. CE809(+): -10V, CE812(+): +15V, C828: +7.5V, CE8F6: +5V, CE8H1: +9.8V 2) VCO frequency adjustment Change the VR805 when there is no signal (video signal off) and adjust to 29.1MHz(error: +/- 0.03MHz) with a frequency counter.
  • Page 12 All manuals and user guides at all-guides.com 4) Adjustment of screen center position Change and adjust the VR802 so that the middle vertical line between Green and magenta is located at the center of the LCD Panel on the Full color bar screen. Full color bar screen 5) Removal of horizontal line noise Remove a thick horizontal line noise while changing the VR803 and monitoring the logo screen.
  • Page 13 All manuals and user guides at all-guides.com LCD TROUBLE SHOOTING GUIDE(1/2) appear shadow form interference in black background DESPLAY CONDITION? INVERTOR ABNORMAL There is only bright light.(LCD B/D abnormal) FUSE(F801)Normal? FUSE Replace Q8F1 Normal operate? IC8F1, IC8F2 Check and Replace T801, D8F1, D8F2, D8F3 Check 7.5V, 15V, -10V Normal? Main B/D on located...
  • Page 14 All manuals and user guides at all-guides.com LCD TROUBLE SHOOTING GUIDE(2/2) IC802 Replace IC802’s CLK and CONT signal? LCD MODE CONT signal? MAIN B/D Check ALL “LOW”(NORMAL condition) TFT LCD pressure voltage? Power source and D803, D804 Check +15V, -10V, +5V Replace TFT LCD Normal? Color Adjusting Normal?
  • Page 15 All manuals and user guides at all-guides.com LCD BLOCK DIAGRAM...
  • Page 16 All manuals and user guides at all-guides.com ELECTRICAL TROUBLE SHOOTING GUIDE 1. Power (DC-DC Converter) Circuit NO POWER ON NO POWER ON by ADAPTOR by BATTERY Is ADAPTOR Replace BATTERY Replace ADAPTOR Is BATTERY OK? OUT 9.8V? Replace F101 Is F101 OK? Replace Q102 Is Q102 OK? Replace LF101...
  • Page 17 All manuals and user guides at all-guides.com B. Audio Out abnormal C. Video Out abnormal VIDEO OUT ABNORMAL AUDIO OUT ABNORMAL Check Audio Jack & Check Video Jack & Mode Mode Check +5V , -5V Check Video signals from MPEG Check Signals from MPEG Check IC402 Replace IC301...
  • Page 18 All manuals and user guides at all-guides.com F. Picture abnormal G. Disc Error DISC ERROR PICTURE ABNORMAL Check Disc Check the disc. YES (If OK) Refer to Servo part Refer to Servo part YES (If OK) If OK Check MPEG_CLK Signal Replace B/D of MPEG part YES (If OK)
  • Page 19 All manuals and user guides at all-guides.com 2. MPEG Circuit Power is on Does Logo appear Check power & clock. on the screen? Does the Check CD/DVD DSP output moving picture of the DVD Disc Is MPEG data signal normal? play on the screen signal.
  • Page 20 All manuals and user guides at all-guides.com 3. Front Circuit(Dogotrpm & Key) START Power on. when power S/W turn on, Check Power. LED ON? Is oscillation of X701 normal? Check waveform of Check waveform Is Digitron on normally? Replace IC702. IC701 Pin12, 16, 18, 19? of IC701 Pin 25.
  • Page 21 All manuals and user guides at all-guides.com 4. RF/Servo Circuit Laser off Put disc in? Check the related circuit Proper RFL signal Disc ID is correct? on MT1389 RFL signal . on MT1389? Check the RFL connection between CON200 and MT1389. Proper Check DMSO related DMSO signal on...
  • Page 22 All manuals and user guides at all-guides.com Proper Check connections between signals on A, B, C, Focus ON OK? MT1389 and pick-up head. D of MT1389 Check the related circuit Proper FEO signal on MT1389 FEO sugnal . on MT1389? Check IC500 IC Check the related Proper FEO signal...
  • Page 23 All manuals and user guides at all-guides.com Audio Normal DAC received Check connection between MT1389 Audio output correct data stream? & Audio DAC. (Check VRST#, ACLK, when disc playback? ABCK, ASDAT3) Normal Check the related circuit of Audio DAC Audio DAC. (Check Audio out? (IC601) out Pin 14, 15,18,19) Check Audio filter, amplify, mute...
  • Page 24 All manuals and user guides at all-guides.com * Chargeing Circuit No turn on Red LED Is 8.4V of J601_Pin1 OK? Is Q603 OK? Replace Q603. Is Q602 OK? Replace Q602. Is L601, C613, C614, Replace L601, C613, R610 OK? C614, R610? Is Q601 OK? Replace Q601 Is IC601 OK?
  • Page 25 All manuals and user guides at all-guides.com BLOCK DIAGRAMS 1. OVERALL BLOCK DIAGRAM LIMIT FO+,FO-,TR+,TR- V,W,U, HW+/-,HV+/-,HU+/-,H- STEP1+/-,STEP2+/- DECK MECHANISM 3-25...
  • Page 26 All manuals and user guides at all-guides.com 2. POWER(DC-DC CONVERTER)BLOCK DIAGRAM 3-26...
  • Page 27 All manuals and user guides at all-guides.com 3. AUDIO/VIDEO BLOCK DIAGRAM 3-27...
  • Page 28 All manuals and user guides at all-guides.com LCD CIRCUIT DIAGRAM LCD1 CIRCUIT DIAGRAM...
  • Page 29 All manuals and user guides at all-guides.com LCD2 CIRCUIT DIAGRAM 3-10...
  • Page 30 All manuals and user guides at all-guides.com LCD3 CIRCUIT DIAGRAM SR14121A 3-11 3-12...
  • Page 31 All manuals and user guides at all-guides.com LCD VOLTAGE SHEET IC801 IR3Y29BM PIN NO VOLT WAVEFORM PIN NO VOLT WAVEFORM Y signal(0.5) HD(0-3.3) Y signal(0.5) C signal(0.5) VD(0-3.3) HQ-OUT CLK(0.4) 0-2.8 CLK(0.4) 0-2.6 0-2.6 0-2.6 R(0.6-4.4) 0-2.6 G(0.6-4.4) 0-2.6 0-2.6 B(0.6-4.4) 0-2.6 CLK 0-2.6...
  • Page 32 All manuals and user guides at all-guides.com LCD P.C. BOARD LOCATION GUIDE LOCATION GUIDE 3-14 3-15...
  • Page 33 All manuals and user guides at all-guides.com...
  • Page 34 All manuals and user guides at all-guides.com CIRCUIT DIAGRAMS 1. MAIN POWER CIRCUIT DIAGRAM POWER INPUT DC+9.8V GT119 TP100 LF101 TP104 J101 F101 ACM0908-801-2P 0433-003A PWR_SRC D101 C102 UDZS16B C140 0.1U BAT7.6V 22U/16V C101 D103 0.1U Q102 is defective RB081L-20 D105 HEC3110 RB081L-20...
  • Page 35 All manuals and user guides at all-guides.com 2. SERVO CIRCUIT DIAGRAM R206 R208 100K A+5V The countermeasure of static electricity Q202 R209 LD PART KTC3875 L201 R233 10uH CD_LD D202 STZ6.8N(OPEN) R207 Q203 100K LDO1 2SB1132 CON200 D203 Q200 Q201 D201 STZ6.8N(OPEN) 2SK3018...
  • Page 36 All manuals and user guides at all-guides.com 3. MAIN(MT1389) CIRCUIT DIAGRAM VREFN TP630 IOWR# TRAY OPEN SWITCH TP631 C563 C565 IOCE# C564 390P OPEN 0.1U Crystal TP642 JITFO JITFN TP643 VREFP No power on R536 SW501 750K TRAY_OPEN_SW R513 VFD_TXD GT500 100K TRAY_OPEN_SW...
  • Page 37 All manuals and user guides at all-guides.com 4. AUDIO CIRCUIT DIAGRAM A_VIDEO_IO_CON A_AUDIO_CD_CON Q318 Q329 Q323 KTC3875 E+5V KTC3875 KTC3875 A+5V TP305 R390 TP307 TP309 Q316 Q317 KRA103S Q325 KTA1504S TP304 KTC3875 D310 R302 Q327 R388 KRA103S 4.7K Q320 TP306 TP308 TP302 TP303...
  • Page 38 All manuals and user guides at all-guides.com 5. VIDEO CIRCUIT DIAGRAM R453 Q409 KTC3875 VIDEO_IO_CON3,6 /V_JACK_IN 3 C438 R408 TP438 0.1U TP435 R440 TP417 TP416 D+3.3V Q408 TP418 KTC3875 R404 CE411 100U/10V TP436 TP401 VIN1 Q415 R415 Q404 A+5V KTC3875 KTA1504S TP439 R406...
  • Page 39 All manuals and user guides at all-guides.com 6. FRONT MICOM CIRCUIT DIAGRAM TP708 SL700 VFD_RXD VFD_RXD 3 FRONT DOWNLOAD CON702 FRONTDOWN-8-0.5 GT701 GT702 A+5V GT703 GT704 E+5V L704 10UH GT705 E+5V IC703 C713 0.1U Signal Power Up (3.3V=>5V) RESET PART TP790 TP795 TP799...
  • Page 40 All manuals and user guides at all-guides.com 7. LCD POWER CIRCUIT DIAGRAM No Display F801 LCDPWR 0433-750mA L8F1 TP813 100UH/0.45A C8K8 C8F11 0.1U 22U/16V R8F2 TP801 R8F5 R8F6 D8F1 100K CRS02 L8F2 TP814 TP817 33UH -15V C8F1 0.47U/25V TP803 TP802 C8F32 C8G11 C8G1...
  • Page 41 All manuals and user guides at all-guides.com 8. BATTERY CHARGE CIRCUIT DIAGRAM Q601 D604 L601 TP655 TP656 TP657 TP658 RB050L-40 10UH/3A DC+9.8V R610 0.025/1W SI4435DY TP672 BAT7.6V TP669 Q602 TP659 SI4435DY R611 10K(1%) C607 IC601 0.47U/25V -INC2 +INC2 TP670 OUTC2 Q603 +INE2 TP663...
  • Page 42 All manuals and user guides at all-guides.com 9. KEY CIRCUIT DIAGRAM E+5V CON901 CON902 CON_KEY12 CON_KEY14 R901 100K TP901 Q902 KTA1504S TP904 TP910 R923 R904 TP906 TP909 R909 R910 TP911 R922 R906 TP907 R907 TP908 R908 4.7K 9.1K 2.7K 1.3K 2.7K TP902 TP905...
  • Page 43 All manuals and user guides at all-guides.com DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING 1. SYSTEM 27MHz CLOCK,RESET,FLASH R/W SIGNAL 2. SDRAM CLOCK 1) MT1389 main clock is at 27MHz(X500) 1) MT1389 main clock is at 27MHz(X501) DCLK = 93MHz, Vp-p=2.2, Vmax=2.7V 3.8V, 27MHz (IC500 PIN 229, 228) FIG 2-1...
  • Page 44 All manuals and user guides at all-guides.com F+(IC200 PIN 24) F+(IC200 PIN 24) FE(IC500 PIN 31) FE(IC500 PIN 31) RFL(IC500 PIN 6) RFL(IC500 PIN 6) FIG 7-2 (DVD) FIG 7-4 (CD) 4. FOCUS ON WAVEFORM F+(IC200 PIN 24) FE(IC500 PIN 31) FOSO(IC200 PIN9) FE(IC500 PIN 31) F+(IC200 PIN 24)
  • Page 45 All manuals and user guides at all-guides.com 6. TRACKING CONTROL RELATED SIGNAL(System checking) TE(IC500 PIN 32) FE(IC500 PIN 31) TRSO(IC200 PIN 8) FOSO(IC200 PIN9) F+(IC200 PIN 24) T-(IC200 PIN 20) F-(IC200 PIN 23) T+(IC200 PIN 19) FIG 8-2 (CD) FIG 10-1(DVD) 5.
  • Page 46 All manuals and user guides at all-guides.com 9. MT1389 VIDEO OUTPUT WAVEFORM 7. RF WAVEFORM 1) Full colorbar signal(CVBS) RFOP(2.3V/1.1V) (IC500 PIN 25) (IC604 PIN 23) RFON(0.8V/2.0V) (IC500 PIN 26) FIG 11-1 FIG 13-1 8. MT1389 AUDIO OPTICAL AND COAXIAL OUTPUT (ASPDIF) 2) Y (IC500 PIN 225) (IC604 PIN 21)
  • Page 47 All manuals and user guides at all-guides.com 3) C 2) Audio related Signal ASDAT 0 ASDAT0(IC301 PIN 3) ABCK(IC301 PIN 4) (IC604 PIN 26) ALRCK(IC5301 PIN 5) FIG 13-3 FIG 14-2 10. AUDIO OUTPUT FROM AUDIO DAC 1) Audio L/R (JK601 PIN 4,5) FIG 14-1 3-54...
  • Page 48 All manuals and user guides at all-guides.com CIRCUIT VOLTAGE CHART MODE MODE MODE MODE MODE MODE MODE MODE MODE MODE STOP PLAY STOP PLAY STOP PLAY STOP PLAY STOP PLAY STOP PLAY STOP PLAY STOP PLAY STOP PLAY STOP PLAY PIN NO.
  • Page 49 All manuals and user guides at all-guides.com MODE MODE MODE MODE MODE MODE STOP PLAY STOP PLAY STOP PLAY STOP PLAY STOP PLAY STOP PLAY STOP PLAY STOP PLAY STOP PLAY STOP PLAY STOP PLAY PIN NO. PIN NO. PIN NO. PIN NO.
  • Page 50 All manuals and user guides at all-guides.com PRINTED CIRCUIT DIAGRAMS 1. MAIN P.C. BOARD LOCATION GUIDE LOCATION GUIDE 3-60 3-61...
  • Page 51 All manuals and user guides at all-guides.com 2. KEY P. C. BOARD LOCATION GUIDE LOCATION GUIDE 3-62 3-63...

Table of Contents