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Dynex DX-LTDVD20 Service Manual

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SERVI C E MANUAL
CAUTION : Before servicing this chassis, read the "IMPORTANT SERVICE SAFETY INFORMATION" section
on page 2 of this manual.
MODEL
DX-LTDVD20
FILE : e15257f
DATA : Sep. 29 2007

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Summary of Contents for Dynex DX-LTDVD20

  • Page 1 SERVI C E MANUAL MODEL DX-LTDVD20 CAUTION : Before servicing this chassis, read the "IMPORTANT SERVICE SAFETY INFORMATION" section on page 2 of this manual. FILE : e15257f DATA : Sep. 29 2007...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS TABLE OF CONTENTS....................2 IMPORTANT SERVICE SAFETY INFORMATION............3,4 GENERAL SPECIFICATIONS ..................5-7 DISASSEMBLY INSTRUCTIONS................8 ISP INSTRUCTION .....................9,10 ELECTRICAL ADJUSTMENTS..................11-12 TROUBLESHOOTING GUIDE..................13-21 BLOCK DIAGRAMS....................22-24 WIRING CONNECTION ....................25 PRINTED CIRCUIT BOARDS..................26-27 SCHEMATIC DIAGRAMS....................28-39 INTERCONNECTION DIAGRAM.................40 WAVEFORMS......................41-42 MECHANICAL EXPLODED VIEWS................43 MECHANICAL REPLACEMENT PARTS LIST............44 ELECTRICAL REPLACEMENT PARTS LIST............45-57...

  • Page 3: Important Service Safety Information

    LASER BEAM CAUTION LABEL When the power supply is being turned on, you may not remove this laser cautions label. If it removes, radiation of laser may be received. PREPARATION OF SERVICING Pickup Head consists of a laser diode that is very susceptible to external static electrocity. Although it operates properly after replacement, if it was subject to electrostatic discharge during replacement, its life might be shortened.
  • Page 4 SAFTY NOTICE SAFTY PRECAUTIONS LEAKAGE CURRENT CHECK Plug the AC line cord directly into a 120V AC outlet (do Measure the AC voltage across the 1500 resistor. not use an isolation transformer for this check). Use an The test must be conducted with the AC switch on and AC voltmeter, having 5000 per volt or more sensitivity.

  • Page 5: General Specifications

    GENERAL SPECIFICATIONS LCD Size / Visual Size 20 inch System LCD Type Color TFT LCD Number of Pixels 1366(H)×768(V) View Range Left/Right/Up/Down Color System NTSC Speaker 2 Speaker 8ohm Sound Output 3W×2 DVD System Color System NTSC Disc Disc Diameter 120mm/90mm Tuning Broadcasting System...
  • Page 6 SRS WOW (SRS 3D/Focus/Tru Bass) Variable Audio Out Tuning CH Program TV/Cable ADD/DELETE Label CH Label Video Label Favorite CH V-Chip V-chip 2.0 Type English / French / Spanish OSD Language Closed Caption CC Advanced Picture Size 16:9 Picture Scroll Cinema Mode Aspect 16:09...
  • Page 7 DMF Support JPEG Digital Out (Dolby Digital) (MPEG) (PCM) (DTS) Down Mix Out (Dolby Digital) (DTS) Closed Caption Screen Saver Audio DAC Owner's Manual Language G-11 Accessories Remote Control Unit Guarantee Card Warning Sheet Quick Set-up Sheet Battery UM size x pcs OEM Brand AC Adapter AC Cord (for AC Adapter)

  • Page 8: Disassembly Instructions

    DISASSEMBLY INSTRUCTIONS 1: STAND (Refer to Fig. 1) 4: MAIN PCB AND POWER PCB. (Refer to Fig. 4) Unlock the supports Remove the screws. Remove the screws Disconnect the connections. Remove stand. Remove the Main PCB and Power PCB. Remove the screws Remove DVD cover.

  • Page 9: Isp Instruction

    ISP INSTRUCTION 1. Connect one end of the Jig to the LPT jack of the computer, and the other 6. Unselect "Program" and "Verify", click "Run" (Refer to Fig. 5). end to the VGA connector PC at the side of the TV. 2.
  • Page 10 RE-WRITE FOR DVD FIRMWARE Turn on the power, and set the DVD mode. Confirm that the "OPEN" will be appeared on the screen. Insert the Up-Date Disc. Automatic read will start and "Upgrade file detected, Upgrade? Press PLAY key to start" will be displayed on the screen.

  • Page 11: Electrical Adjustments

    ELECTRICAL ADJUSTMENTS Press "INPUT+ 2 + 5 + 8 + 0" on the remote control in turn to enter Factory mode as FIG 1. Factory Menu For AU20_T200XW02 INPUT SOURCE ADC ADJ. COLORTEMP ADJ. PICTURE MODE FACTORY RESET USER RESET SW Version 00:52:17 02/09/07...
  • Page 12 WHEN REPLACING EEPROM (MEMORY) IC Turn POWER on. Press "INPUT+ 2 + 5 + 8 + 0" on the remote control in turn to enter Factory mode as FIG 1. Factory Menu For AU20_T200XW02 INPUT SOURCE ADC ADJ. COLORTEMP ADJ. PICTURE MODE FACTORY RESET USER RESET...

  • Page 13: Troubleshooting Guide

    TROUBLESHOOTING GUIDE No work / LED is off Check if power Replace power connection connection isnormal Check if voltage of Replace Power PCB Power PCB CZ2, CZ3 is normal Replace fuse and eliminate short Check if fuse is normal or open situation Check if voltage of J8 Replace Main PCB pin4 is normal...
  • Page 14 TROUBLESHOOTING GUIDE No work / LED is red Check if RMC Replace RMC PCB PCB is normal Check if voltage of U1,U3, Replace U1,U3,U6,U25,U27 U6,U25,U27 is normal Replace Main PCB...
  • Page 15 TROUBLESHOOTING GUIDE No Picture / LED is blue Check the power and Check if voltage of power Check if backlight is normal control signal of CZ2 Replace Main PCB PCB CZ3 pin 13 is normal in main PCB is normal Replace LCD panel Check if connector Replace CON10...
  • Page 16 TROUBLESHOOTING GUIDE No CVBS/SVIDEO Picture Check if SVIDEO/CVBS Replace connect wire signal of U22 pin25,26, 29,30 is normal Replace Main PCB No HDMI Check if signal of Replace connection CON9 is normal Check if voltage of Replace U12 or U13 U13 pin8 is normal Check if signal of Replace U9...
  • Page 17 TROUBLESHOOTING GUIDE No DVD picture Check if voltage of Replace Main PCB J2 pin 1 is normal Check if signal of Replace CONNECTION J2 pin 8,9,10 is normal Replace DVD...
  • Page 18 TROUBLESHOOTING GUIDE No VGA picture Check if signal of CON7 Replace connection pin 1,2,3,12,13,15 is normal Check if volatge of Replace U8 U8 pin 8 is normal Check if signal of U22 pin Replace Main PCB 7,8,33,34,55,56 is normal Check if signal of Replace U22 LVDS is normal Replace Main PCB...
  • Page 19 TROUBLESHOOTING GUIDE No AV1/AV2 audio Check if signal of CON3 Replace connection pin 1,2 and CON4 pin 6,8 is normal Check if signal of Replace U22 U22 pin 79,80 is normal Check if signal of Replace U32 U32 pin 1,7 is normal Check if signal of U31 Replace U31 pin 1,2,14,15 is normal...
  • Page 20 TROUBLESHOOTING GUIDE No PC/HDMI audio Check if signal of U22 Replace U22 pin 70,71,75,76 is normal Check if signal of Replace U36 U36 pin 1,7 is normal Check if signal of U31 Replace U31 pin 1,2,14,15 is normal Replace Speaker...
  • Page 21 TROUBLESHOOTING GUIDE No DVD audio Check if signal of J2 Replace DVD pin 18,19 is normal Check if signal of Replace U22 U22 pin 79,80 is normal Check if signal of Replace U36 U36 pin 1,7 is normal Check if signal of U31 Replace U31 pin 1,2,14,15 is normal Replace Speaker...

  • Page 22: Block Diagrams

    DVD BLOCK DIAGRAM LCD BLOCK DVD LOADER KWL248L 3.3V, 1.8V DVD/CDPD DVD_MENU RF_A, B, C, D, E, F DVD_TRIP STB_DVD VIDEO DVD/CD, DVD_LD, CD_LD DVD PB/C DVD PB/Y V1P4/FMO/FOO DVD_RMC TR+/-, F+/- TRO/STBY/DMO Motor Drive SPINDLE/ MPEG/MICON/DSP/RF_AMP SP+/-, SL+/- D001 STEPING/ DVD POWER BA5954...
  • Page 23 SCALER/LVDS/ADC/JACK/AV SWITCH/STEREO/SOUND AMP BLOCK DIAGRAM T SDA T SCC M_SDA SDRAM DEMUX TUNER M_SCC MSD809 DTVS205CH201 SDRAM CVBS AV1_S_VIDE_C SDRAM AV1_S_VIDE_Y AV1_CVBS TV VIDEO DECORD AV1_L /ADC/SCALE AV1_R FLASH MSD116L AV2_CVBS AV2_L L OUT AV2_R LINE L OUT AV3_Y AUDIO AMP R OUT 4580 AV3_Pb...
  • Page 24 POWER BLOCK DIAGRAM P O W E R S U P P L Y H V P O W E R P C B M A I N P C B 5 VA 1 2 VA U 1 0 2 . 5 V H D A M 111 7 - 2 .

  • Page 25: Wiring Connection

    WIRING CONNECTION HV POWER PCB POWER PCB LCD PANEL RMC PCB CON12 CON1 SPEAKERS CON10 OPERATION PCB MIAN PCB CON4 CON1 INPUT PCB...

  • Page 26: Printed Circuit Boards

    MAIN PCB (TOP) MAIN PCB (BOTTOM)
  • Page 27 OPERATION PCB RMC PCB (TOP) RMC PCB (BOTTOM) INPUT PCB...

  • Page 28: Schematic Diagrams

    MSD116L CIRCUIT DIAGRAM...
  • Page 29 MSD POWER CIRCUIT DIAGRAM...
  • Page 30 MCU & RTC CIRCUIT DIAGRAM...
  • Page 31 DEMODULATOR CIRCUIT DIAGRAM...
  • Page 32 SDRAM CIRCUIT DIAGRAM...
  • Page 33 SYS-POWER CIRCUIT DIAGRAM...
  • Page 34 AV IN & OUT CIRCUIT DIAGRAM...
  • Page 35 HD & VGA CIRCUIT DIAGRAM...
  • Page 36 HDMI CIRCUIT DIAGRAM 9 J9 J...
  • Page 37 TUNER CIRCUIT DIAGRAM ) - (...
  • Page 38 AUDIO CIRCUIT DIAGRAM...
  • Page 39 EXT-MODULE CON CIRCUIT DIAGRAM...

  • Page 40: Interconnection Diagram

    INTERCONNECTION DIAGRAM POWER PCB AC120~240V 50/60Hz ON/OFF ON/OFF ADJUST ADJUST HV POWER PCB +12V +12V +12V +12V +12V +12V LCD PANEL CON10 RXE3+ RXE3+ RXE3- RXE3- RXEC+ RXEC+ RXEC- RXEC- CVBS CVBS RXE2+ RXE2+ DVD-Y DVD-Y RXE2- RXE2- DVD-PB/C DVD-PB/C RXE1+ RXE1+ DVD-PR/Y...

  • Page 41: Waveforms

    WAVEFORMS SOUND AMP/HEADPHON AMP STEREO 20μs 2.0ms 2.0ms 500mV 500mV 500mV 2.0ms 2.0ms 20μs 500mV 500mV 200mV MICON 20μs 50ns 2.0ms 200mV 500mV 2.0V SCALER 20μs 2.0ms 20μs 200mV 2.0V 500mV TUNER 20μs 20μs 20μs 500mV 500mV 500mV...
  • Page 42 WAVEFORMS AUDIO/VIDEO MPEG/MICON/DSP 10μs 500μs 2.0V 10ns 500mV 100mV LVDS 10ms 500μs 100mV 500mV 20mV INTERFACE_HDMI IC 20μs 1.0V 10μs 20ns 200mV 1.0V 20μs 1.0V 200ns 10μs 1.0V 200mV MEMORY 20μs 1.0V 500mV...

  • Page 43: Mechanical Exploded Views

    DTV2030 EXPLODED VIEW...

  • Page 44: Mechanical Replacement Parts List

    PART No. PART NAME Q'TY eb46144p DTV-2030/DAM1/US FRONT PANEL ADORN eb46143p DTV-2030/DAM1/US SPEAKER COVER eb46145p DTV-2030/DAM1/US TRANSPARENCY WINDIOW COVER eb45822s DTV-2030/DAM1/US TRANSPARENCY WINDIOW eb48392 DTV-2030/DAM1/US FRONT PANEL es5156d YDP4070-10 SPEAKER es5184 YDQG30-6 SPEAKER e22772 DTV-2030(M1) RMC PCB ea7939n T200XW02(V0)N TFT LCD eb45814ps DTV-2030/DAM1/US FUNCTION BUTTON COVER eb45815p...

  • Page 45: Electrical Replacement Parts List

    DX-LTDVD20 LCD TV PART No. PART NAME Q'TY e12279q DB2600-2.1 DVD e22630 DTV207A POWER PCB e22631 IVA2006C HV POWER PCB e22874 DTV20M(MATSC) MAIN PCB e22772 DTV-2030(M1) RMC PCB e22773 DTV-2030(M1) OPERATION PCB ea7939n T200XW02(V0)N TFT LCD es06195c RC-260I REMOTE es15257fss...
  • Page 46 REF No. PART No. PART NAME REF No. PART No. PART NAME DTV-2030(M1) OPERATION PCB ep20014 GRM39B473K16PT ea6434 ep20028 GRM39CH221J50PT EVQ11L04W ea6434 ep20028 GRM39CH221J50PT EVQ11L04W ea6434 ep20085 GRM40Y5V225Z16 EVQ11L04W ea6434 ep20029 GRM39CH331J50PT EVQ11L04W ea6434 ep20046 GRM39B561K50PT EVQ11L04W ea6434 ep20085 GRM40Y5V225Z16 EVQ11L04W ea6434 ep20029 GRM39CH331J50PT...
  • Page 47 REF No. PART No. PART NAME REF No. PART No. PART NAME ep20101 ECJ2FF1C106Z C105 ep20015 GRM39F104Z25PT ep20015 GRM39F104Z25PT C106 ep20015 GRM39F104Z25PT ep20009 GRM39B102K50PT C107 ep20015 GRM39F104Z25PT ep20014 GRM39B473K16PT C108 ep20015 GRM39F104Z25PT ep20014 GRM39B473K16PT C109 ep20015 GRM39F104Z25PT ep20014 GRM39B473K16PT C110 ep20002 GRM39CH220J50PT ep20014 GRM39B473K16PT C111...
  • Page 48 REF No. PART No. PART NAME REF No. PART No. PART NAME C208 ep20015 GRM39F104Z25PT C251 ep20015 GRM39F104Z25PT C210 ep20101 ECJ2FF1C106Z C252 ep20015 GRM39F104Z25PT C211 ep20015 GRM39F104Z25PT C253 ep20015 GRM39F104Z25PT C212 ep20015 GRM39F104Z25PT C254 ep20015 GRM39F104Z25PT C213 ep20085 GRM40Y5V225Z16 C255 ep20015 GRM39F104Z25PT C214 ep20015 GRM39F104Z25PT...
  • Page 49 REF No. PART No. PART NAME REF No. PART No. PART NAME C300 ep20101 ECJ2FF1C106Z C345 ep20002 GRM39CH220J50PT C301 ep20010 GRM39B152K50PT C347 ep20035 GRM39F105Z10PT C302 ep20015 GRM39F104Z25PT C348 ep20035 GRM39F105Z10PT C303 ep20038 GRM39CH471J50PT C350 ep20015 GRM39F104Z25PT C304 ep20015 GRM39F104Z25PT c351 ep20101 ECJ2FF1C106Z C305 ep20015 GRM39F104Z25PT...
  • Page 50 REF No. PART No. PART NAME REF No. PART No. PART NAME C388 ep20101 ECJ2FF1C106Z CA14 ep30028a 16V/47UF C389 ep20101 ECJ2FF1C106Z CA15 ea3516a CD288H-470UF-M-16V C390 ep20101 ECJ2FF1C106Z CA16 ep30028a 16V/47UF C391 ep20101 ECJ2FF1C106Z CA18 ep20101 ECJ2FF1C106Z C480 ep20051 GRM39CH5R1D50PT CA20 ep20085 GRM40Y5V225Z16 C483 ep20015 GRM39F104Z25PT...
  • Page 51 REF No. PART No. PART NAME REF No. PART No. PART NAME CON7 ea7470 DD19 ep5766d STZ6.2N VGA socket (17"LCDTV) CON8 ea7534 DD20 ep5766d STZ6.2N CH-05 CON9 ep7108c YSHM1R00A0W DD21 ep1620 BAV70-7-F CON10 ep7150 DD22 ep5766d STZ6.2N YWB005401KA1R CON11 ea6509 DD23 ep5766d STZ6.2N B-4B-PH...
  • Page 52 REF No. PART No. PART NAME REF No. PART No. PART NAME ep6679 ep5073d 2SD601A-R LQH4N100K04 ep6659 ep5073d 2SD601A-R BGH2012B601LT ep6659 ep5700 BGH2012B601LT 2SB709AR ep6659 ep5750 BGH2012B601LT MMST3904-7-F ep6659 ep5073d 2SD601A-R BGH2012B601LT ep6659 ep5073d 2SD601A-R BGH2012B601LT ep6659 ep5073d 2SD601A-R BGH2012B601LT ep6659 ep5073d 2SD601A-R BGH2012B601LT...
  • Page 53 REF No. PART No. PART NAME REF No. PART No. PART NAME ep11005 RC-03K750JT ep11005 RC-03K750JT ep11053 RC-03K562JT ep11005 RC-03K750JT ep11053 RC-03K562JT ep11005 RC-03K750JT ep11116 RC-03K470JT ep11005 RC-03K750JT ep11053 RC-03K562JT ep11116 RC-03K470JT ep11005 RC-03K750JT ep11116 RC-03K470JT ep11053 RC-03K562JT ep11116 RC-03K470JT ep11003 RC-03K100JT ep11013 RC-03K103JT ep11003 RC-03K100JT...
  • Page 54 REF No. PART No. PART NAME REF No. PART No. PART NAME R126 ep11006 RC-03K101JT R176 ep11013 RC-03K103JT R127 ep11009 RC-03K102JT R177 ep11009 RC-03K102JT R128 ep11140 RC-03K220JT R182 ep11012 RC-03K472JT R129 ep11008 RC-03K471JT R206 ep11013 RC-03K103JT R130 ep11240 RC-03K391FT R207 ep11013 RC-03K103JT R132 ep11013 RC-03K103JT...
  • Page 55 REF No. PART No. PART NAME REF No. PART No. PART NAME R260 ep11013 RC-03K103JT R306 ep11164 RC-03K225JT R261 ep11013 RC-03K103JT R307 ep11031 RC-03K392JT R262 ep11003 RC-03K100JT R308 ep11003 RC-03K100JT R263 ep11013 RC-03K103JT R309 ep11008 RC-03K471JT R264 ep11009 RC-03K102JT R310 ep11036 RC-03K223JT R265 ep11012 RC-03K472JT...
  • Page 56 REF No. PART No. PART NAME REF No. PART No. PART NAME R366 ep11117 RC-03K511JT R416 ep11009 RC-03K102JT R367 ep11071 RC-03K221JT R455 ep11013 RC-03K103JT R368 ep11071 RC-03K221JT R456 ep11013 RC-03K103JT R369 ep11009 RC-03K102JT ep11206 RCML08W220JT R370 ep11116 RC-03K470JT ep11206 RCML08W220JT R371 ep11029 RC-03K222JT ep11550 RCML08W470JT...
  • Page 57 REF No. PART No. PART NAME ep90762a HY57V641620ETP-6-C ep90762a HY57V641620ETP-6-C ea4802 TDA7266SA ep4513 NJM4580E-TE2 ep5759 IRF7304TR-PBF ep90905 MC9S08QG4CDTER ep4513 NJM4580E-TE2 ea9633 DTVS205CH201A ep90862 AP1122EA ep90887 AP1117E33LA ep90860a MSD809-LF ep90503 SN74LVC2G08 ep90939 AIC1896 ea9634 HC-49/S49.38111MHZ ea6476 14.31818M-30 ea6476 14.31818M-30...

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