Symphonic WF2703 Service Manual
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Symphonic WF2703 Service Manual

Symphonic WF2703 Service Manual

27" color television
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SERVICE MANUAL

27" COLOR TELEVISION
WF2703

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  • Page 1: Service Manual

    SERVICE MANUAL 27" COLOR TELEVISION WF2703...

  • 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. 3 Fig. 1 [2] CRT CBA Anode Cap [1] Rear Cabinet [4] CRT Fig. 4 Fig. 2 L6609DC...

  • Page 13: Wiring Diagram

    TV Cable Wiring Diagram SP802 SP801 DG691 DEGAUSSING COIL CLN802 CLN801 MAIN CBA CN801 CN802 WH301A CN691 FLYBACK TRANSFORMER TUNER T571 WH501A CN571 AC601 AC CORD FOCUS JK1501 WH301B SCREEN ANODE WH501B CN1501 Fig. 5 TO CRT GROUND L6609DC...

  • Page 14: Electrical Adjustment Instructions

    ELECTRICAL ADJUSTMENT INSTRUCTIONS General Note: 1. DC 120V Adjustment "CBA" is abbreviation for "Circuit Board Assem- Purpose: To obtain correct operation. bly". Symptom of Misadjustment: The picture is dark and NOTE: the unit does not operate correctly. Electrical adjustments are required after replacing circuit components and certain mechanical parts.
  • Page 15 3-1. Setting for 7F and FRENCH TINT (TNT) data Values 1. Press " MENU " button on the Service remote con- trol unit. Then select " TINT " (TNT) display. General 2. Press " CH o / p " buttons on the Service remote 1.
  • Page 16 5. V. Size Adjustment 7. H. Position Adjustment Purpose: To obtain correct vertical width of screen image. Purpose: To obtain correct horizontal position of screen image. Symptom of Misadjustment: If V. Size is incorrect, vertical size of image on the screen may not be properly displayed. Symptom of Misadjustment: If H.

  • Page 17: Pin Cushion Adjustment

    9. PIN Cushion Adjustment 10. Cut-off Adjustment Purpose: To obtain correct straight vertical line of Purpose: To adjust the beam current of R, G, B, and screen image. screen voltage. Symptom of Misadjustment: If H.Pin cushion is incor- Symptom of Misadjustment: White color may be rect, vertical line of image on the screen may not be reddish, greenish or bluish.

  • Page 18: White Balance Adjustment

    11. White Balance Adjustment Note: Confirm that Cut Off Adj. is correct after this adjustment, and attempt Cut Off Adj. if needed. Purpose: To mix red, green and blue beams correctly for pure white. 12. Sub-Brightness Adjustment Symptom of Misadjustment: White becomes bluish Purpose: To get proper brightness.

  • Page 19: Focus Adjustment

    13. Focus Adjustment The following 2 adjustments normally are not attempted in the field. Only when replacing the Purpose: Set the optimum Focus. CRT then adjust as a preparation. Symptom of Misadjustment: If Focus Adjustment is 14. Purity Adjustment incorrect, blurred images are shown on the display. Purpose: To obtain pure color.

  • Page 20: Convergence Adjustment

    15. Convergence Adjustment 1. Loosen the Ring Lock and align red with blue dots or Crosshatch at the center of the screen by rotat- Purpose: To obtain proper convergence of red, green ing (RB) C.P. Magnets. (See Fig. 7) and blue beams. 2.

  • Page 21: Block Diagram

    BLOCK DIAGRAMS System Control Block Diagram IC111 TV MICON/VIDEO /AUDIO/CHROMA /DEFLECTION RCV101 REMOTE RCV-IN SENSOR KEY-IN1 SWITCH KEY-IN2 INPUT0 IF/VIDEO BLOCK IC151 (MEMORY) 72 I2C-OPEN SCL 6 INPUT0 Q481 SDA 5 FROM IF/VIDEO BLOCK AGC-IN INSEL1 INSEL2 FROM/TO MONO-OUT MONO-OUT AUDIO BLOCK STEREO-IN STEREO-IN...
  • Page 22 IF/Video Block Diagram RF/IF SIGNAL VIDEO SIGNAL AUDIO SIGNAL IC31 (IF SIGNAL PROCESS) MAIN CBA CF31 VIDEO 4.5MHz FILTER TRAP CF32 4.5MHz TU-AUDIO AUDIO BLOCK FILTER TP301 VCO F/B IF AGC DET EXT.CLK FROM/TO INPUT0 SYSTEM WF16 CONTROL BLOCK IC111 X301 TV MICON/VIDEO 3.58MHz...

  • Page 23: Audio Block Diagram

    Audio Block Diagram AUDIO SIGNAL MAIN CBA MTS/SAP AUDIO SIGNAL PROCESS IC401 FROM Q411 TU-AUDIO IF/VIDEO BLOCK TRAP BUFFER DEMOD MATRIX STEREO PILOT STEREO FROM/TO STEREO-IN DRIVER SYSTEM CONTROL MONO-OUT BLOCK PHASE COMP X441 Q441 SP801 IC481 (INPUT SELECT) SPEAKER IC802 (AUDIO AMP) L-CH FRONT...
  • Page 24 CRT/H.V. Block Diagram VIDEO SIGNAL IC551 V-DEFLECTION CONTROL MAIN CBA WF12 THERMAL DY551 D.Y. WF11 PROTECTION RAMP-OUT DRIVE Q531 (SWITCHING) PULSE V-RAMP-F/B FROM/TO DRIVE Q551, IF/VIDEO BLOCK Q552 CONTROL CN571 Q561 Q532 (SWITCHING) SWITCHING Q572 Q571 T572 VR561 VR562 P-ON-ON H-DRIVE H.DRIVE H.OUTPUT...

  • Page 25: Power Supply Block Diagram

    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 26: 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 27 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 28 Main 1/4 Schematic Diagram VIDEO SIGNAL MAIN 1/4 Ref No. Position IC111 IC151 TRANSISTORS Q111 Q321 L6609SCM1...
  • Page 29 Main 2/4 Schematic Diagram VIDEO SIGNAL AUDIO SIGNAL MAIN 2/4 Ref No. Position IC401 IC481 IC802 TRANSISTORS Q411 Q441 Q481 Q825 Q831 Q832 Q833 CONNECTORS CN801 CN802 L6609SCM2...
  • Page 30 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 31 Main 4/4 & CRT Schematic Diagram MAIN 4/4 Ref No. Position Ref No. Position Ref No. Position Ref No. Position TRANSISTORS TEST POINTS TRANSISTORS IC551 Q572 TP592 Q1512 TRANSISTORS CONNECTORS TP601 Q1522 VARIABLE RESISTORS Q531 CN571 Q1532 WH301A VR561 Q532 CONNECTORS Q551 WH501A...
  • Page 32 Main CBA Top View CAUTION: FOR CONTINUED PROTECTION AGAINST RISK BECAUSE A HOT CHASSIS GROUND IS PRESENT IN THE POWER OF FIRE, REPLACE ONLY WITH SAME TYPE 4A, 125V FUSE. MAIN CBA SUPPLY CIRCUIT, AN ISOLATION TRANSFORMER MUST BE USED. CAUTION ! ATTENTION: UTILISER UN FUSIBLE DE RECHANGE DE Ref No.
  • Page 33 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 34 CRT CBA Top View CRT CBA Bottom View CRT CBA Ref No. Position TRANSISTORS Q1512 Q1522 Q1532 CONNECTORS CN1501 WH301B WH501B TEST POINTS TP1501 TP1502 WF14 WF15 WF13 Q1522 Q1522 Q1512 Q1512 Q1532 Q1532 TP1501 Collector Base Collector Base Collector Base TP1502 BLUE...

  • Page 35: 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 36: 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 BL6600F01013-1 CN691 FOCUS CN1501 T571 SCREEN WH301B WH301A CLN301 BLUE BLUE GREEN GREEN WH501B WH501A CLN501 CRT CBA HEATER 3...

  • Page 37: Ic Pin Function

    IC PIN FUNCTIONS IC111(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 38 Signal Name Function 71 MONO-OUT MONO-OUT 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. Not Used 78 FM-SW Switching IF IC VCO 79 P-ON-H Output for P-ON-H...
  • Page 39 EXPLODED VIEWS Cabinet SHINWHA TAPE SGT-730 V501-1 (BLACK) Details for DY551 and surrounding parts SHINWHA TAPE SGT-730 DY551 (WHITE) V501-2 Scotch Tape #880 CLN801 DG691 CLN551 DY551 SP801 CRT CBA Scotch Tape #880 CLN802 V501 SP802 AC601 MAIN CBA See Electrical Parts List for parts with this mark.
  • Page 40 Packing TAPE PACKING TAPE 11-3 L6601PEX...

  • Page 41: 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 DY551# DEFLECTION YOKE 6150Z-1046A or LLBY00ZGS008 replacing any of these components, read carefully the DEFLECTION YOKE KDY4UWE21X LLBY00ZMS026 product safety notice in this service manual.
  • Page 42 CRT Warning Label Location CRT Type No. CRT Warning Label 20030523 12-2 L6609CA...

  • Page 43: Electrical Parts List

    ELECTRICAL PARTS LIST PRODUCT SAFETY NOTE: Products marked with a Ref. No. Description Part No. # have special characteristics important to safety. FILM CAP .(P) 0.047µF/50V J or CMA1JJS00473 Before replacing any of these components, read care- FILM CAP .(P) 0.047µF/50V J CA1J473MS029 fully the product safety notice in this service manual.
  • Page 44 Ref. No. Description Part No. Ref. No. Description Part No. C349 ELECTROLYTIC CAP . 470µF/10V M or CE1AMASTL471 ELECTROLYTIC CAP . 470µF/25V M or CE1EMZNDL471 ELECTROLYTIC CAP . 470µF/10V M CE1AMASDL471 ELECTROLYTIC CAP . 470µF/25V M CE1EMZADL471 C353 ELECTROLYTIC CAP . 1µF/50V M or CE1JMASTL1R0 C565 FILM CAP .(P) 0.1µF/50V J or...
  • Page 45 Ref. No. Description Part No. Ref. No. Description Part No. C654# ELECTROLYTIC CAP . 1µF/50V M or CE1JMASTL1R0 ELECTROLYTIC CAP . 100µF/16V M CE1CMASDL101 ELECTROLYTIC CAP . 1µF/50V M or CE1JMASDL1R0 C833 CERAMIC CAP .(AX) F Z 0.01µF/25V 1DA1EZT0F103 ELECTROLYTIC CAP . 1µF/50V M CE1JMASDL010 CONNECTORS C655...
  • Page 46 Ref. No. Description Part No. Ref. No. Description Part No. SWITCHING DIODE 1N4148 NDTZ001N4148 D681 ZENER DIODE MTZJT-779.1B or QDTB0MTZJ9R1 D585 SWITCHING DIODE 1SS133(T-77) or QDTZ001SS133 ZENER DIODE DZ-9.1BSBT265 NDTB0DZ9R1BS SWITCHING DIODE 1N4148 NDTZ001N4148 D683 SCHOTTKY BARRIER DIODE ERA81-004 QDPZERA81004 D586 SWITCHING DIODE 1SS133(T-77) or QDTZ001SS133...
  • Page 47 Ref. No. Description Part No. Ref. No. Description Part No. LINE FILTER MS036 or LLBG00ZY2009 TRANSISTOR 2SC2785(J) or QQSJ02SC2785 LINE FILTER CSA-LF032 LLBG00ZSA007 TRANSISTOR KTC3199(GR) or NQS10KTC3199 L692 CHOKE COIL 47µH-K or LLBD00PKV007 TRANSISTOR KTC3198(GR) or NQS40KTC3198 POT COIL 47µH K or LLBD**DMM001 TRANSISTOR 2SC3331(T)-AANP or 2SC3331TZ...
  • Page 48 Ref. No. Description Part No. Ref. No. Description Part No. CARBON RES. 1/4W J 270 Ω TRANSISTOR 2SC2785(J) or QQSJ02SC2785 RCX4JATZ0271 CARBON RES. 1/4W J 180 Ω TRANSISTOR KTC3199(GR) or NQS10KTC3199 RCX4JATZ0181 CARBON RES. 1/4W J 10k Ω TRANSISTOR KTC3198(GR) or NQS40KTC3198 RCX4JATZ0103 CARBON RES.
  • Page 49 Ref. No. Description Part No. Ref. No. Description Part No. CARBON RES. 1/4W J 220 Ω CARBON RES. 1/4W J 8.2k Ω R357 RCX4JATZ0221 R566 RCX4JATZ0822 CARBON RES. 1/4W J 220 Ω CARBON RES. 1/4W J 1k Ω R358 RCX4JATZ0221 R568 RCX4JATZ0102 CARBON RES.
  • Page 50 Ref. No. Description Part No. Ref. No. Description Part No. CARBON RES. 1/4W J 12k Ω R664# RCX4JATZ0123 SWITCHES CARBON RES. 1/4W J 5.6k Ω R665# RCX4JATZ0562 SW101 TACT SWITCH SKQSAB or SST0101AL038 METAL RESISTOR 2W J 18k Ω or R666# RN02183ZU001 TACT SWITCH KSM0612B or...
  • Page 51 Ref. No. Description Part No. Ref. No. Description Part No. JS104 PCB JUMPER D0.6-P5.0 JW5.0T C1521 CERAMIC CAP .(AX) B K 270pF/50V CCA1JKT0B271 JS342 PCB JUMPER D0.6-P5.0 JW5.0T C1531 CERAMIC CAP .(AX) B K 270pF/50V CCA1JKT0B271 JS642 PCB JUMPER D0.6-P10.0 JW10.0T CONNECTOR JS704...
  • Page 52 Printed in Japan 2003-06-02 HO...

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