Durabrand DBTV1902 Service Manual
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Durabrand DBTV1902 Service Manual

Durabrand DBTV1902 Service Manual

Color television receiver
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DBTV1902
SERVICE MANUAL
This SUPPLEMENT must be used together SERVICE MANUAL for DBTV1901 Series B.
All other test and repair procedures are as shown in the ORIGINAL MANUAL.
Please file this SUPPLEMENT with the ORIGINAL VERSIONS.
COLOR TELEVISION RECEIVER
SUPPLEMENT
MFR'S VERSION B
Design and specifications are subject to change without notice.

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  • Page 1 DBTV1902 SERVICE MANUAL COLOR TELEVISION RECEIVER SUPPLEMENT MFR'S VERSION B This SUPPLEMENT must be used together SERVICE MANUAL for DBTV1901 Series B. All other test and repair procedures are as shown in the ORIGINAL MANUAL. Please file this SUPPLEMENT with the ORIGINAL VERSIONS.
  • Page 2 MECHANICAL REPLACEMENT PARTS LIST DBTV1901 Series B DBTV1902 REF. NO. PART NO. DESCRIPTION PART NO. DESCRIPTION A3L211C720 CABINET FRONT ASS'Y A3L217C720 CABINET FRONT ASS'Y 722552A019 SHEET,RATING 722552A022 SHEET,RATING 7230007398 SECURITY TAG 793WCDB237 GIFT BOX 793WCDB366 GIFT BOX JB5K0200 POLYBAG,INSTRUCTION JB5U0200...

  • Page 3: Servicing Notices On Checking

    SERVICING NOTICES ON CHECKING 1. KEEP THE NOTICES 6. AVOID AN X-RAY As for the places which need special attentions, Safety is secured against an X-ray by consider- they are indicated with the labels or seals on the ing about the cathode-ray tube and the high cabinet, chassis and parts.

  • Page 4: Table Of Contents

    CONTENTS SERVICING NOTICES ON CHECKING ......................A1-1 HOW TO ORDER PARTS ..........................A1-1 IMPORTANT ..............................A1-1 CONTENTS ..............................A2-1 GENERAL SPECIFICATIONS ........................A3-1~A3-4 DISASSEMBLY INSTRUCTIONS 1. REMOVAL OF ANODE CAP ......................B1-1 2. REMOVAL AND INSTALLATION OF FLAT PACKAGE IC ............... B2-1, B2-2 SERVICE MODE LIST ............................

  • Page 5: General Specifications

    GENERAL SPECIFICATIONS CRT Size / Visual Size 19 inch / 480.0mmV System CRT Type Normal Deflection degree Magnetic Field BV/BH +0.45G/0.18G Color System NTSC Speaker 1Speaker Position Bottom Size 3 Inch Impedance Sound Output 1.5 W 10%(Typical) 1.0 W NTSC3.58+4.43 /PAL60Hz Tuning Broadcasting System System M...
  • Page 6 GENERAL SPECIFICATIONS Contrast Color Tint (NTSC Only) Sharpness Tuning Bass Treble Balance Back Light Stereo,Audio Output,SAP Video Color Stream Channel(TV/Cable) CH Label Sleep Timer Sound Mute V-chip Rating OSD Language English French Spanish OSD Language Setting English Clock and Sleep Timer Max Time 120 Min Timer...
  • Page 7 GENERAL SPECIFICATIONS TV/VCR(VCR) Code Play Stop Cable G-11 Features Auto Degauss Auto Shut Off Canal+ CATV Anti-theft Rental Memory(Last CH) Memory(Last Volume) V-Chip Type USA,ORION Type Auto Search CH Allocation Channel Lock Just Clock Function Game Position CH Label VM Circuit Full OSD Premiere Comb Filter...
  • Page 8 GENERAL SPECIFICATIONS PTB Sheet 300 ohm to 75 ohm Antenna Adapter G-13 Interface Switch Front Power System Select Main Power SW Sub Power Channel Up/Reset Channel Down/Enter Volume Up/Set Up Volume Down/Set Down MENU=Volume Up+Volume Down Rear AC/DC TV/CATV Selector Degauss Main Power SW Indicator...

  • Page 9: Disassembly Instructions

    DISASSEMBLY INSTRUCTIONS 1. REMOVAL OF ANODE CAP 3. After one side is removed, pull in the opposite direction to remove the other. Read the following NOTED items before starting work. NOTE After turning the power off there might still be a potential Take care not to damage the Rubber Cap.

  • Page 10: Removal And Installation Of Flat Package Ic

    DISASSEMBLY INSTRUCTIONS REMOVAL AND INSTALLATION OF When IC starts moving back and forth easily after desoldering completely, pickup the corner of the IC using FLAT PACKAGE IC a tweezers and remove the IC by moving with the IC desoldering machine. (Refer to Fig. 2-3.) REMOVAL NOTE Put the Masking Tape (cotton tape) around the Flat...
  • Page 11 DISASSEMBLY INSTRUCTIONS INSTALLATION When bridge-soldering between terminals and/or the soldering amount are not enough, resolder using a Thin- Take care of the polarity of new IC and then install the tip Soldering Iron. (Refer to Fig. 2-8.) new IC fitting on the printed circuit pattern. Then solder each lead on the diagonal positions of IC temporarily.

  • Page 12: Service Mode List

    SERVICE MODE LIST This unit provided with the following SERVICE MODES so you can repair, examine and adjust easily. To enter the Service Mode, press both set key and remote control key for more than 1 second. Set Key Remocon Key Operations Releasing of V-CHIP PASSWORD.

  • Page 13: Electrical Adjustments

    ELECTRICAL ADJUSTMENTS BEFORE MAKING ELECTRICAL 2. BASIC ADJUSTMENTS ADJUSTMENTS 2-1: RF AGC DELAY Read and perform these adjustments when repairing the Place the set with Aging Test for more than 15 minutes. circuits or replacing electrical parts or PCB assemblies. Receive an 63dB monoscope pattern.
  • Page 14 ELECTRICAL ADJUSTMENTS 2-8: OSD HORIZONTAL Activate the adjustment mode display of Fig. 1-1. Press the VOL. UP/DOWN button on the remote control until the difference of A and B becomes minimum. (Refer to Fig. 2-3) "A" Fig. 2-1 00 OSD Fig.
  • Page 15 ELECTRICAL ADJUSTMENTS 2-13: Confirmation of Fixed Value (step No.) Please check if the fixed values of the each adjustment items are set correctly referring below. FUNCTION H VCO BRIGHT MAX BRIGHT MIN CONT CENT CONT MIN COLOR MAX COLOR MIN SHARPNESS FM LEVEL LEVEL...
  • Page 16 ELECTRICAL ADJUSTMENTS 3-3: STATIC CONVERGENCE PURITY AND CONVERGENCE ADJUSTMENTS NOTE Adjust after performing adjustments in section 3-2. NOTE Receive the crosshatch pattern from the color bar Turn the unit on and let it warm up for at least 30 generator. minutes before performing the following adjustments.
  • Page 17 ELECTRICAL ADJUSTMENTS 4. ELECTRICAL ADJUSTMENT PARTS LOCATION GUIDE (WIRING CONNECTION) CP601 FB401 CP806_1 TP023 TU001 TP022 J801 CP401 CRT PCB T502 L503 CP502 S501B S501A CD101A CD101B MAIN PCB AC IN SPEAKER...

  • Page 18: Block Diagram

    BLOCK DIAGRAM TU001 CHROMA IC CH. UP IC601 M61250FP X602 IC1001 AN7511 3.579545MHz VOL. UP X' TAL AUDIO OUT MICON IC SOUND AMP SP1001 CH. DOWN RF AGC OUT CF601 IC101 OEC7073A SAW FILTER VIF IN (1) VOL. DOWN Q606 AUDIO MUTE VIF IN (2) REG.

  • Page 19: Printed Circuit Boards Main/Crt

    PRINTED CIRCUIT BOARDS MAIN/CRT (INSERTED PARTS) SOLDER SIDE RISK OF FIRE - REPLACE AS MARKED. CP502 S501B R500 CD501 D509 C526 FH502 FH501 S501A F501 C502 OS101 L501_1 B502 FB401 D504 Q501 B503 R808 C514 C503 Q502 C501 W821 Q803_1 D502 D803 R508...
  • Page 20 PRINTED CIRCUIT BOARDS MAIN/CRT (CHIP MOUNTED PARTS) SOLDER SIDE R621 R1001 R601 R612 R1004 R617 R1008 R628 R633 R129 R134 R104 R420 R133 IC101 C113 R118 C114 R132 R529 R814...
  • Page 21 MICON/TUNER SCHEMATIC DIAGRAM (MAIN PCB) ACCESSORY TU001 ENV56DB6G3 W835 R128 TM101 R607 C003 RC-DW010 R101 R126 2.7K FROM/TO CHROMA OS101 PIC-37143SY TUNER+5V FROM DEFLECTION/CRT R002 R001 18K 1/2W 18K 1/2W X-RAY R143 FROM POWER DEGAUSS MICON IC TO SOUND/AV IC101 OEC7073A AUDIO_MUTE AUDIO MUTE...
  • Page 22 CHROMA SCHEMATIC DIAGRAM (MAIN PCB) FROM POWER UNREG+12V Q603 W818 KTC3203_Y R623 120 1/4W Q605 FROM SOUND/AV Q604 KTC3203_Y KTC3203_Y Q606 VIDEO_IN KTC3203_Y 11.3 CF603 SFSRA4M50CF00-A0 R642 D605 11E1-EIC 3.18 8.63 7.96 2.55 08.7 1.70 5.65 C634 2.21 4.92 Y SW OUT FROM/TO SOUND/AV QIF OUT 100P CH...
  • Page 23 POWER SCHEMATIC DIAGRAM (MAIN PCB) 4A 125V TO MICON/TUNER CAUTION: FOR CONTINUED PROTECTION AGAINST FIRE HAZARD, DEGAUSS REPLACE ONLY WITH THE SAME TYPE 4A 125V (F501) FUSE. ATTENTION: POUR UNE PROTECTION CONTINUE LES RISQUES D’INCEIE N’UTILISER QUE DES FUSIBLE DE MEME TO SOUND/AV TYPE 4A 125V (F501).
  • Page 24 DEFLECTION/CRT SCHEMATIC DIAGRAM CP802A CP802B (MAIN PCB) 9253_010_000_000 9253_010_000_000 FROM CHROMA CLAMP CLAMP CLAMP CLAMP CLAMP G.OUT G.OUT G.OUT G.OUT G.OUT R.OUT R.OUT R.OUT R.OUT R.OUT B.OUT B.OUT B.OUT B.OUT B.OUT V-OUT IC IC401 AN5522 HEATER HEATER HEATER HEATER THERMAL PROTECTION PUMP 180V...
  • Page 25 SOUND/AV SCHEMATIC DIAGRAM (MAIN PCB) J703 (FRONT) AV1-09D-4 TO CHROMA R703 AUDIO 2 AUDIO_IN A_IN R704 V_IN VIDEO 2 VIDEO_IN J702 AV1-09D-3 W807 FROM TV POWER SOUND_GND SOUND+B SPEAKER CD101A CH012002 FROM MICON/TUNER SP1001 S08F21 CD101B 8 OHM R1001 CH012003 AUDIO_MUTE C1002_1 R1003...

  • Page 26: Micon/Tuner

    WAVEFORMS MICON/TUNER 11 1V 20µs/div 200mV 5ms/div 0.5V 20µs/div 12 1V 20µs/div 0.5V 20µs/div 200mV 20µs/div 1V 20µs/div 3 200mV 20µs/div 20V 20µs/div DEFLECTION/CRT 200mV 5ms/div 14 0.5V 5ms/div 9 200mV 20µs/div CHROMA 15 20V 20µs/div 0.5V 5ms/div 0.5V 2ms/div NOTE: The following waveforms were measured at the point of the corresponding balloon number in the schematic diagram.

  • Page 27: Sound/Av

    WAVEFORMS 16 2V 20µs/div 21 50V 20µs/div 26 500mV 20us/div 22 50V 20µs/div 200V 20µs/div SOUND/AV 10V 5ms/div 0.5V 1ms/div 10V 5ms/div 1V 1ms/div 50V 20µs/div 25 500mV 1ms/div NOTE: The following waveforms were measured at the point of the corresponding balloon number in the schematic diagram.

  • Page 28: Mechanical Exploded View

    MECHANICAL EXPLODED VIEW J801 PCB110 (CRT PCB) L503 FB401 V801 TU001 PCB010 (MAIN PCB) SP1001...

  • Page 29: Mechanical Replacement Parts List

    MECHANICAL REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION A3L211C720 CABINET,FRONT ASSY 723000B325 FILM,DECORATION 701WPJB715 CABINET,FRONT 713WPAA047 GUIDE ,REMOCON 735WPAA417 BUTTON,FRAME 741WUA0019 SPRING,EARTH 702WPAA183 CABINET,BACK 722552A019 SHEET,RATING 7220001119 SHEET,CSA WARNING 7220001107 SHEET,HWC 7230006818 SHEET,CAUTION 8121F50B84 SCREW,TAPPING(BO) FAI20 FLAT 5x28 8117540A64 SCREW,TAPPING(B0) TRUSS 4x16...

  • Page 30: Electrical Replacement Parts List

    ELECTRICAL REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION REF. NO. PART NO. DESCRIPTION RESISTORS DIODES R148 R00106104J RC 100K OHM 1/6W D28T11E2N2 DIODE SILICON 11E2N-TA1B2 R001T6104J RC 100K OHM 1/6W D606 D97U06R81B DIODE,ZENER MTZJ6.8B T-77 ! R401 R4X5T6273F R,METAL 27K OHM 1/6W D607 D97U05R61B DIODE,ZENER...
  • Page 31 ELECTRICAL REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION MISCELLANEOUS FH501 06710T0006 HOLDER,FUSE EYF-52BC FH502 06710T0006 HOLDER,FUSE EYF-52BC OS101 077Q037003 REMOTE RECEIVER PIC-37143SY S101 WHL6032038 FLAT CABLE AWG26 10C BLACK 320MM ! SP1001 070Y132018 SPEAKER S08F21 TH501 DF20A3R0Q0 DEGAUSS ELEMENT PTDAA1BF3R0Q100 TM101 076N0DW010 TRANSMITTER...
  • Page 32 M3L2-11C SPEC.NO. O/R NO. W223003...
  • Page 33 DBTV1902 SERVICE MANUAL COLOR TELEVISION RECEIVER REVISION 1 MFR’S VERSION A MFR’S VERSION A48AKH13X04 A48LGS30X19N45 Design and specifications are subject to change without notice.
  • Page 34 Change of CRT ELECTRICAL REPLACEMANT PARTS LIST MFR'S VERSION A MFR'S VERSION B PART NO. DESCRIPTION PART NO. DESCRIPTION REF. NO. C444 P4N8FJ102H CMPP 0.001 UF 1.25KV MAIN PCB ASS'Y (VERSION A) MAIN PCB ASS'Y (VERSION B) PCB010 A3L217B010 A3L211C010 TMA525A TMA525A CRT W/DY...

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