Durabrand DBTV2500 Service Manual
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Durabrand DBTV2500 Service Manual

Durabrand DBTV2500 Service Manual

Color television receiver
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DBTV2500
SERVICE MANUAL
COLOR TELEVISION RECEIVER
ORIGINAL
MFR'S VERSION B
Design and specifications are subject to change without notice.

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Summary of Contents for Durabrand DBTV2500

  • Page 1 DBTV2500 SERVICE MANUAL COLOR TELEVISION RECEIVER ORIGINAL MFR’S VERSION B Design and specifications are subject to change without notice.
  • Page 2 DBTV2500 SERVICE MANUAL COLOR TELEVISION RECEIVER REVISION 1 MFR’S VERSION D MFR’S VERSION IC101 OEC7044A OEC7045A Please file this revision with the original version.

  • Page 3: 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 4: Electrical Adjustments

    ELECTRICAL ADJUSTMENTS 1. BEFORE MAKING ELECTRICAL 2. BASIC ADJUSTMENTS ADJUSTMENTS 2-1: RF AGC DELAY Read and perform these adjustments when repairing the Receive an 80dB monoscope pattern. circuits or replacing electrical parts or PCB assemblies. Connect the digital voltmeter to TP001. Activate the adjustment mode display of Fig.
  • Page 5 ELECTRICAL ADJUSTMENTS Fig. 2-1 00 OSD Fig. 2-3 2-9: OSD HORIZONTAL 110% 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) 100% Fig.

  • Page 6: Block Diagram

    BLOCK DIAGRAM Q351 MUTE SW. TU001 CHROMA IC CH UP IC601 M61203BFP X602 3.579545MHz IC351 AN7523 VOL UP X' TAL AUDIO OUT MICON IC SOUND IC SP351 CH DOWN RF AGC OUT IC101 OEC7044A CF601 SAW FILTER VIF IN (1) VOL DOWN Q606 AUDIO MUTE...
  • Page 7 MICON/TUNER SCHEMATIC DIAGRAM (MAIN PCB) TU001 NJH3021U268 ACCESORY ATC001 NXC0032-010010 TP001 TM101 R25-1127 C003 FROM DEFLECTION/CRT P_CON+5V OS101 FROM POWER PIC-28143SY-2 R001 S809X 68K1/2W R002 FROM/TO CHROMA 68K 1/2W I2C_OFF MICON IC IC101 OEC7044A R123 OSD_R P50/H.SYNC RED R 4.7K R122 P51/V.SYNC GREEN G...

  • Page 8: Chroma Schematic Diagram

    CHROMA SCHEMATIC DIAGRAM (MAIN PCB) TO MICON/TUNER SYNC Y_VIDEO AT+5V 10.6 FROM POWER REG. Q603 15.0 2SD734 P_CON+15V S802Y S802X REG. RESET Q606 2SD734 CF604 EFCT4R5MW5 FROM POWER W828 AT+15V R615 CF603 EFCT4R5YS5A R638 6.8K D607 C661 0.01 Y 1SS133 R646 TO SOUND C638...
  • Page 9 DEFLECTION/CRT SCHEMATIC DIAGRAM (MAIN PCB) CD802 2E054401 FROM/TO CHROMA CLAMP CLAMP CLAMP CLAMP CLAMP G.OUT G.OUT G.OUT G.OUT G.OUT B.OUT B.OUT B.OUT B.OUT B.OUT R.OUT R.OUT R.OUT R.OUT R.OUT V-OUT IC V_OUT CP802A CP802B IC401 LA78041 51048-0510 51048-0510 V_FEEDBACK HS401 L802 THERMAL PUMP...

  • Page 10: Power Schematic Diagram

    POWER SCHEMATIC DIAGRAM (MAIN PCB) CAUTION: FOR CONTINUED PROTECTION AGAINST FIRE HAZARD, REPLACE ONLY WITH THE SAME TYPE 6.3A 125V (F501) FUSE. ATTENTION: POUR UNE PROTECTION CONTINUE LES RISQUES 6.3A 125V D’INCEIE N’UTILISER QUE DES FUSIBLE DE MEME TYPE 6.3A 125V (F501). DEGAUSS COIL L502 R502...
  • Page 11 SOUND SCHEMATIC DIAGRAM FROM MICON/TUNER (MAIN PCB) AUDIO_MUTE FROM CHROMA AUDIO_OUT FROM DEFLECTION/CRT SPEAKER P_CON+5V SP351_2 CP351_1 SA04A05AWA SOUND+B TID-X02P-B2 SOUND IC IC351_1 AN7523 SPEAKER SP351_2 SA04A05AWA W834 W820 S801Y S809Y S801X W829 W813 W810 MUTE SW. R354 Q351 2SC1815Y W814 PCB010 TMX456...
  • Page 12 WAVEFORMS MICON/TUNER 11 1V 20µs/div 200mV 5ms/div 0.5V 20µs/div 12 1V 20µs/div 200mV 20µs/div 0.5V 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 13 WAVEFORMS 16 2V 20µs/div 21 50V 20µs/div 22 50V 20µs/div 200V 20µs/div SOUND 0.5V 1ms/div 10V 5ms/div 1V 1ms/div 10V 5ms/div 50V 20µs/div NOTE: The following waveforms were measured at the point of the corresponding balloon number in the schematic diagram.

  • Page 14: Mechanical Exploded View

    MECHANICAL EXPLODED VIEW J801 PCB110 (CRT PCB) L502 FB401 MS501 V801 ATC001 TU001 PCB010 SP351 (MAIN PCB)

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