Durabrand DCT3203 Service Manual
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Durabrand DCT3203 Service Manual

Durabrand DCT3203 Service Manual

32" color television
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SERVICE MANUAL

32" COLOR TELEVISION
DCT3203

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Summary of Contents for Durabrand DCT3203

  • Page 1: Service Manual

    SERVICE MANUAL 32" COLOR TELEVISION DCT3203...

  • Page 2: Table Of Contents

    IMPORTANT SAFETY NOTICE Proper service and repair is important to the safe, reliable operation of all Funai Equipment. The service procedures recommended by Funai and de- scribed in this service manual are effective methods of performing service operations. Some of these service special tools should be used when and as recommended.

  • Page 3: Specifications

    SPECIFICATIONS <TUNER> ANT. Input ------------------- 75ohm Unbal., F type Reference Level ----------- 20Vp-p (CRT Green Cathode) Test Input Signal ---------- 400Hz 30% modulation Description Condition Unit Nominal Limit 1. Intermediate Freq. Picture 45.75 Sound 41.25 2. Peak Picture Sens dBµV CATV dBµV dBµV...

  • Page 4: Important Safety Precautions

    IMPORTANT SAFETY PRECAUTIONS Prior to shipment from the factory, our products are strictly inspected for recognized product safety and electrical codes of the countries in which they are to be sold. However, in order to maintain such compliance, it is equally important to implement the following precautions when a set is being serviced.
  • Page 5 ing is performed that involves B+, horizontal de- earth ground. If a voltage reading in excess of 1.0V flection or high voltage. Correct operation of the X- is obtained, remove and reinsert the AC power radiation protection circuits also must be recon- plug in the opposite polarity and again measure firmed each time they are serviced.
  • Page 6 Precautions during Servicing 3) Align the lengths of the wires to be connected. In- sert the wires fully into the connector. A. Parts identified by the ( # ) symbol are critical for 4) Use the crimping tool to crimp the metal sleeve at safety.
  • Page 7 Safety Check after Servicing Examine the area surrounding the repaired location Chassis or Secondary Conductor for damage or deterioration. Observe that screws, parts and wires have been returned to original posi- tions. Afterwards, perform the following tests and con- Primary Circuit Terminals firm the specified values in order to verify compliance with safety standards.

  • Page 8: Standard Notes For Servicing

    STANDARD NOTES FOR SERVICING Circuit Board Indications (2) Remove the flat pack-IC with tweezers while ap- plying the hot air. a. The output pin of the 3 pin Regulator ICs is indicat- (3) Bottom of the flat pack-IC is fixed with glue to the ed as shown.
  • Page 9 With Soldering Iron: soldering iron to center of the flat pack-IC and heat up. Then remove (glue will be melted). (Fig. S-1-6) (1) Using desoldering braid, remove the solder from all pins of the flat pack-IC. When you use solder (5) Release the flat pack-IC from the CBA using twee- flux which is applied to all pins of the flat pack-IC, zers.
  • Page 10 2. Installation Instructions for Handling Semiconductors (1) Using desoldering braid, remove the solder from the foil of each pin of the flat pack-IC on the CBA Electrostatic breakdown of the semiconductors may so you can install a replacement flat pack-IC more occur due to a potential difference caused by electro- easily.

  • Page 11: Cabinet Disassembly Instructions

    CABINET DISASSEMBLY INSTRUCTIONS 1. Disassembly Flowchart Note: (1) Order of steps in procedure. When reassembling, This flowchart indicates the disassembly steps for the follow the steps in reverse order.These numbers cabinet parts, and the CBA in order to gain access to are also used as the Identification (location) No.
  • Page 12 [3] Main CBA [1] Rear Cabinet Fig. 1 Fig. 3 Anode Cap [4] CRT [1] Rear Cabinet Fig. 2 Fig. 4 L6655DC...
  • Page 13 TV Cable Wiring Diagram L691 DEGAUSSING COIL SP802 SP801 CLN802 CLN801 MAIN CBA CN801 CN802 CN691 WH301A FLYBACK TRANSFORMER TUNER CN571 T571 WH501A AC601 AC CORD FOCUS JK1501 SCREEN WH301B WH501B ANODE CN1501 Fig. 5 TO CRT GROUND L6655DC...

  • Page 14: Electrical Adjustment Instructions

    ELECTRICAL ADJUSTMENT INSTRUCTIONS General Note: How to set up the service mode: "CBA" is abbreviation for "Circuit Board Assem- Service mode: bly." 1. Use the service remote control unit. NOTE: 2. Turn the power on. (Use main power on the TV Electrical adjustments are required after replacing unit.) circuit components and certain mechanical parts.

  • Page 15: Initial Setting

    2. Initial Setting 3. AV Memory Setting data General General 1. Enter the Service mode. (See page 5-1) 1. Enter the Service mode. (See page 5-1) 2. Press "VOL p" button on the service remote control 2. When “AV MEMORY” setting to “ON” (refer to “2. unit.
  • Page 16 4. Setting for BRIGHT, CONTRAST, S-TNT COLOR, TINT and SHARPNESS 1. Press "MENU" button on the service remote con- trol unit. Then select "S-TINT" (S-TNT) display. data Values 2. Press "CH o/p" buttons on the service remote General control unit so that the value of "S-TINT" (S-TNT) 1.
  • Page 17 5. Black Stretch Control Adjustment Purpose: To show the fine black color. SD Check mode (Factory mode) Symptom of Misadjustment: Black color will not Press "1" buton. appear correctly. Note: Use service remote control unit. 1. Enter the Service mode. (See page 5-1) 2.
  • Page 18 8. H. Position Adjustment 10. V. Position Adjustment Purpose: To obtain correct horizontal position of Purpose: To obtain correct vertical width of screen image. screen image. Symptom of misadjustment: If V. Position is incor- Symptom of Misadjustment: If H. Position is incor- rect, vertical height of image on the screen may not be rect, horizontal position of image on the screen may properly displayed.

  • Page 19: Pin Cushion Adjustment

    12. V-Pedestal Adjustment 15. PIN Cushion Adjustment 1. In VIDEO mode of V1, V2, or YUV, press "3" button Purpose: To obtain correct straight vertical line of on the service remote control unit and select "V- screen image. PED" mode. (Display changes "U-PED" and "V- Symptom of Misadjustment: If H.Pin cushion is incor- PED"...
  • Page 20 16. Cut-off Adjustment 17. White Balance Adjustment Purpose: To adjust the beam current of R, G, B, and Purpose: To mix red, green and blue beams correctly screen voltage. for pure white. Symptom of Misadjustment: White color may be Symptom of Misadjustment: White becomes bluish reddish, greenish or bluish.

  • Page 21: Purity Adjustment

    18. Sub-Brightness Adjustment 4. Adjust the Focus Control on the FBT to obtain clear picture. Purpose: To get proper brightness. The following adjustments normally are not Symptom of Misadjustment: If Sub-Brightness is attempted in the field. Only when replacing the incorrect, proper brightness cannot be obtained by CRT then adjust as a preparation.

  • Page 22: Convergence Adjustment

    21. Convergence Adjustment Purpose: To obtain proper convergence of red, green and blue beams. Symptom of Misadjustment: If Convergence Adjust- ment is incorrect, the edge of white letters may have color edges. Test Point Adj. Point Mode Input C.P. Magnet Dot Pattern (RB), C.P .

  • Page 23: Block Diagram

    BLOCK DIAGRAMS System Control Block Diagram IC333 TV MICON/VIDEO /AUDIO/CHROMA /DEFLECTION RCV101 REMOTE RCV-IN SENSOR (NO CONNECTION) CN301 I2C-OPEN KEY-IN1 SWITCH KEY-IN2 CN301 is used for adjustment at factory INPUT0 IC151 IF/VIDEO BLOCK (MEMORY) 72 I2C-OPEN SCL 6 SDA 5 FROM/TO INPUT0 Q141...
  • Page 24 IF/Video Block Diagram RF/IF SIGNAL VIDEO SIGNAL AUDIO SIGNAL IC33 (IF SIGNAL PROCESS) MAIN CBA CF31 VIDEO 4.5MHz FILTER TRAP CF32 4.5MHz AUDIO BLOCK FILTER EXT.CLK VCO F/B WF16 IF AGC DET FROM/TO INPUT0 SYSTEM CONTROL BLOCK IC333 TV MICON/VIDEO /AUDIO/CHROMA /DEFLECTION JK721...

  • Page 25: Audio Block Diagram

    Audio Block Diagram AUDIO SIGNAL IC431 (MTS/SAP AUDIO SIGNAL PROCESS) MAIN CBA FROM STEREO 75uS L-CH OFFSET IF/VIDEO BLOCK FILTER FILTER DE-EMPH CANCEL OFFSET CANCEL MATRIX FILTER R-CH WIDE BAND WIDE BAND WIDE BAND OFFSET (L-R)/SAP FILTER RMS DET EXPAND CANCEL SAP OUT FILTER...
  • Page 26 CRT/H.V. Block Diagram VIDEO SIGNAL IC551 (V-DEFLECTION CONTROL) MAIN CBA WF12 THERMAL DY551 D.Y. WF11 PROTECTION RAMP-OUT DRIVE P-ON-H Q531 (SWITCHING) PULSE V-RAMP-F/B DRIVE Q551, Q552 CONTROL FROM/TO IF/VIDEO BLOCK CN551 Q561 Q533 (SWITCHING) SWITCHING Q572 Q571 T572 VR561 VR562 P-ON-ON H-DRIVE H.DRIVE...
  • Page 27 Power Supply Block Diagram CAUTION ! Fixed voltage ( or Auto voltage selectable ) power supply circuit is used in this unit. If Main Fuse (F601) is blown, check to see that all components in the power supply CAUTION: FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, NOTE : circuit are not defective before you connect the AC plug to the AC power supply.

  • Page 28: Schematic Diagram / Cba's And Test Points

    SCHEMATIC DIAGRAMS / CBA'S AND TEST POINTS Standard Notes Many electrical and mechanical parts in this chassis have special characteristics. These characteristics often pass unnoticed and the protection afforded by them cannot necessarily be obtained by using replacement compo- nents rated for higher voltage, wattage, etc. Replacement parts that have these special safety characteristics are identified in this manual and its supplements;...
  • Page 29 LIST OF CAUTION, NOTES, AND SYMBOLS USED IN THE SCHEMATIC DIAGRAMS ON THE FOLLOWING PAGES: 1. CAUTION: FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ONLY WITH SAME TYPE_A,_V FUSE. ATTENTION: UTILISER UN FUSIBLE DE RECHANGE DE MÊME TYPE DE_A,_V. 2.
  • Page 30 Main 1/4 Schematic Diagram VIDEO SIGNAL MAIN 1/4 Ref No. Position IC151 IC333 TRANSISTORS Q111 Q131 Q141 Q191 Q192 Q321 CONNECTOR CN301 L6655SCM1...
  • Page 31 Main 2/4 Schematic Diagram VIDEO SIGNAL AUDIO SIGNAL MAIN 2/4 Ref No. Position IC431 IC771 IC801 TRANSISTORS Q825 Q831 Q832 Q841 Q851 Q951 Q956 Q961 CONNECTORS CN801 CN802 L6655SCM2...
  • Page 32 Main 3/4 Schematic Diagram CAUTION ! IF SIGNAL CAUTION: FOR CONTINUED PROTECTION AGAINST RISK Fixed voltage ( or Auto voltage selectable ) power supply circuit is used in this unit. NOTE : OF FIRE, REPLACE ONLY WITH SAME TYPE 4A, 125V FUSE. VIDEO SIGNAL If Main Fuse (F601) is blown, check to see that all components in the power supply The voltage for parts in hot circuit is measured...
  • Page 33 Main 4/4 & CRT Schematic Diagram MAIN 4/4 Ref No. Position Ref No. Position Ref No. Position Ref No. Position TRANSISTORS TRANSISTORS TEST POINTS Q1511 IC551 Q571 TP591 Q1512 TRANSISTORS Q572 TP592 Q1521 CONNECTORS Q531 TP601 Q1522 Q533 CN571 VARIABLE RESISTORS Q1531 WH301A VR561...
  • Page 34 Main CBA Top View CAUTION ! BECAUSE A HOT CHASSIS GROUND IS PRESENT IN THE POWER CAUTION: FOR CONTINUED PROTECTION AGAINST RISK Fixed voltage ( or Auto voltage selectable ) power supply circuit is used in this unit. SUPPLY CIRCUIT, AN ISOLATION TRANSFORMER MUST BE USED. OF FIRE, REPLACE ONLY WITH SAME TYPE 4A, 125V FUSE.
  • Page 35 Main CBA Bottom View CAUTION: FOR CONTINUED PROTECTION AGAINST RISK CAUTION ! BECAUSE A HOT CHASSIS GROUND IS PRESENT IN THE POWER OF FIRE, REPLACE ONLY WITH SAME TYPE 4A, 125V FUSE. Fixed voltage ( or Auto voltage selectable ) power supply circuit is used in this unit. SUPPLY CIRCUIT, AN ISOLATION TRANSFORMER MUST BE USED.
  • Page 36 CRT CBA Top View CRT CBA Bottom View CRT CBA Ref No. Position TRANSISTORS Q1511 Q1512 Q1521 Q1522 Q1531 Q1532 CONNECTORS CN1501 WH301B WH501B TEST POINTS TP500 TP501 WF15 WF14 WF13 Q1511 Q1511 Q1521 Q1521 Q1531 Q1531 Collector Base Base Collector Base Collector...

  • Page 37: Waveforms

    WAVEFORMS Input: NTSC Color Bar Signal (with 1kHz Audio Signal) INITIAL POSITION: Unplug unit from AC outlet for at least 5 minutes. reconnect to AC outlet and then turn power on. WF1 ~ WF16 = Waveforms to be observed at (Brightness---Center Color---Center Tint --- Center Contrast---Approx 70%) Waveform check points.

  • Page 38: Wiring Diagram

    WIRING DIAGRAM CN801 CLN801 1 SP-L SP801 SP-GND SPEAKER L-CH CN802 CLN802 1 SP-R SP802 SP-GND SPEAKER R-CH ANODE TU1 TUNER UNIT V501 MAIN CBA BL6650F01011-1 CN691 FOCUS CN1501 T571 SCREEN WH301B WH301A CLN301 BLUE BLUE GREEN GREEN WH501B WH501A CLN501 CRT CBA HEATER 3...

  • Page 39: Ic Pin Function

    IC PIN FUNCTIONS IC333 (TV Micro Computer) Signal Name Function Signal Name Function 35 N.U. Not Used 36 N.U. Not Used 37 V RAMP F/B V Ramp Feed Back N.U. Not Used 38 V RAMP OUT Vertical Output N.U. Not Used 39 V RAMP CAP V Ramp OSC Capacitor N.U.
  • Page 40 Signal Name Function 70 RCV-IN Input For Remote Control 71 N.U. Not Used White Balance Adjustment 72 I2C OPEN Judgement 73 AFT AFT Voltage Input 74 DG-ON-H Degaussing Coil Control 75 AGC AGC Voltage Input 76 PROTECT 3 Power Supply Protection 77 N.U.
  • Page 41 EXPLODED VIEWS Cabinet SHINWHA TAPE SGT-730 V501-1 (BLACK) Details for DY551 and surrounding parts SHINWHA TAPE SGT-730 DY551 (WHITE) V501-2 Lead Clamper Lead CLN551 Clamper DY551 CRT CBA L691 Lead Clamper Lead Clamper Lead Lead Clamper Scotch Tape #880 Clamper V501 SP801 SP802...
  • Page 42 Packing POP LABEL TAPE PACKING TAPE 11-3 L6250PEX...

  • Page 43: Mechanical Parts List

    MECHANICAL PARTS LIST PRODUCT SAFETY NOTE: Products marked with a # Ref. No. Description Part No. have special characteristics important to safety. Before WEDGE DB25SR XV10000D9001 replacing any of these components, read carefully the CRT TYPE B product safety notice in this service manual. Don't V501# CRT A80QCF340X33 TCRT190GS042...

  • Page 44: Electrical Parts List

    ELECTRICAL PARTS LIST PRODUCT SAFETY NOTE: Products marked with a Ref. No. Description Part No. # have special characteristics important to safety. ELECTROLYTIC CAP . 0.47µF/50V M CE1JMASDLR47 Before replacing any of these components, read care- ELECTROLYTIC CAP . 4.7µF/50V M or CE1JMASTL4R7 fully the product safety notice in this service manual.
  • Page 45 Ref. No. Description Part No. Ref. No. Description Part No. C325 CERAMIC CAP .(AX) SL J 12pF/50V CCA1JJTSL120 C444 ELECTROLYTIC CAP . 0.33µF/50V M or CE1JMASTLR33 C328 ELECTROLYTIC CAP . 10µF/50V M or CE1JMASTL100 ELECTROLYTIC CAP . 0.33µF/50V M CE1JMASDLR33 ELECTROLYTIC CAP .
  • Page 46 Ref. No. Description Part No. Ref. No. Description Part No. C578 FILM CAP .(P) 0.01µF/50V J or CMA1JJS00103 C657# ELECTROLYTIC CAP . 2200µF/35V M or CE1GMZNTL222 FILM CAP .(P) 0.01µF/50V J or CA1J103MS029 ELECTROLYTIC CAP . 2200µF/35V M CE1GMZNDL222 FILM CAP .(P) 0.01µF/50V J TV or CMB1JJS00103 C658# ELECTROLYTIC CAP .
  • Page 47 Ref. No. Description Part No. Ref. No. Description Part No. ELECTROLYTIC CAP . 1µF/50V M CE1JMASDL010 RECTIFIER DIODE ERA22-02 or QDPZ0ERA2202 C809 ELECTROLYTIC CAP . 1µF/50V M or CE1JMASTL1R0 RECTIFIER DIODE 10ELS2 QDQZ0010ELS2 ELECTROLYTIC CAP . 1µF/50V M or CE1JMASTL010 D502# ZENER DIODE MTZJT-7724B or QDTB00MTZJ24...
  • Page 48 Ref. No. Description Part No. Ref. No. Description Part No. D652# DIODE FR154 or NDLZ000FR154 D853 ZENER DIODE MTZJT-779.1B or QDTB0MTZJ9R1 FAST RECOVERY DIODE ERB44-02 QDPZ0ERB4402 ZENER DIODE DZ-9.1BSBT265 NDTB0DZ9R1BS D653# DIODE FR154 or NDLZ000FR154 D854 SWITCHING DIODE 1SS133(T-77) or QDTZ001SS133 FAST RECOVERY DIODE ERB44-02 QDPZ0ERB4402...
  • Page 49 Ref. No. Description Part No. Ref. No. Description Part No. TRANSISTOR KTA1267(GR) or NQS10KTA1267 TRANSISTOR KTC3198(GR) or NQS40KTC3198 TRANSISTOR KTA1266(GR) or NQS40KTA1266 TRANSISTOR 2SC3331(T)-AANP or 2SC3331TZ TRANSISTOR 2SA1318(T)-AANP or 2SA1318TZ TRANSISTOR 2SC3331(U)-AANP or 2SC3331UZ TRANSISTOR 2SA1318(U)-AANP or 2SA1318UZ TRANSISTOR 2SC1815-GR(TPE2) QQS102SC1815 TRANSISTOR 2SA1015-GR(TPE2) QQS102SA1015...
  • Page 50 Ref. No. Description Part No. Ref. No. Description Part No. CARBON RES. 1/4W J 12k Ω Q696 RES. BUILT-IN TRANSISTOR BA1F4M-T or QQSZ00BA1F4M RCX4JATZ0123 CARBON RES. 1/4W J 100 Ω or RES. BUILT-IN TRANSISTOR KRC103M NQSZ0KRC103M RCX4JATZ0101 CARBON RES. 1/6W J 100 Ω Q825 TRANSISTOR 2SC2785(F) or QQSF02SC2785...
  • Page 51 Ref. No. Description Part No. Ref. No. Description Part No. CARBON RES. 1/4W J 100 Ω or CARBON RES. 1/4W J 22k Ω R177 RCX4JATZ0101 R520# RCX4JATZ0223 CARBON RES. 1/6W J 100 Ω CARBON RES. 1/4W J 22k Ω RCX6JATZ0101 R522 RCX4JATZ0223 CARBON RES.
  • Page 52 Ref. No. Description Part No. Ref. No. Description Part No. CARBON RES. 1/4W J 220k Ω CARBON RES. 1/4W J 10k Ω R592# RCX4JATZ0224 R680 RCX4JATZ0103 CARBON RES. 1/4W J 68k Ω CARBON RES. 1/4W J 12 Ω or R593# RCX4JATZ0683 R681# RCX4JATZ0120...
  • Page 53 Ref. No. Description Part No. Ref. No. Description Part No. CARBON RES. 1/4W J 470 Ω or R831 RCX4JATZ0471 BC571 BEAD INDUCTORS FBA04HA600VB-00 LLBF00STU026 CARBON RES. 1/6W J 470 Ω RCX6JATZ0471 BC572 PCB JUMPER D0.6-P5.0 JW5.0T CARBON RES. 1/4W J 22k Ω R832 RCX4JATZ0223 BC602...
  • Page 54 Ref. No. Description Part No. Ref. No. Description Part No. RELAY ALKS321 MRNDC12MS013 L1531 PCB JUMPER D0.6-P5.0 JW5.0T TRANSISTORS SA601# SURGE ABSORBER AVR-S07D471KAAS or QVQZ0AVRS07D SURGE ABSORBER JVR-07N471K or NVQZVR07N471 Q1511 TRANSISTOR 2SC2785(F) or QQSF02SC2785 SURGE ABSORBER CNR-10D471K or NVQZR10D471K TRANSISTOR 2SC2785(H) or QQSH02SC2785 SURGE ABSORBER CNR-07D471K or...
  • Page 55 Ref. No. Description Part No. CARBON RES. 1/4W J 100 Ω or R1524 RCX4JATZ0101 CARBON RES. 1/6W J 100 Ω RCX6JATZ0101 CARBON RES. 1/4W J 820 Ω or R1525 RCX4JATZ0821 CARBON RES. 1/6W J 820 Ω RCX6JATZ0821 CARBON RES. 1/4W J 220 Ω or R1528 RCX4JATZ0221 CARBON RES.

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