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Symphonic ST423E Service Manual

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SERVICE MANUAL
23" COLOR TELEVISION
ST423E

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Summary of Contents for Symphonic ST423E

  • Page 1 SERVICE MANUAL 23" COLOR TELEVISION ST423E...

  • 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 How to Remove / Install Flat Pack-IC a. The output pin of the 3 pin Regulator ICs is indicat- 1. Removal ed as shown. With Hot-Air Flat Pack-IC Desoldering Machine: (1) Prepare the hot-air flat pack-IC desoldering ma- Top View Bottom View chine, then apply hot air to the Flat Pack-IC (about...
  • Page 9 3. The flat pack-IC on the CBA is affixed with glue, so With Soldering Iron: be careful not to break or damage the foil of each (1) Using desoldering braid, remove the solder from pin or the solder lands under the IC when remov- all pins of the flat pack-IC.
  • Page 10 2. Installation (4) Bottom of the flat pack-IC is fixed with glue to the CBA; when removing entire flat pack-IC, first apply (1) Using desoldering braid, remove the solder from soldering iron to center of the flat pack-IC and heat the foil of each pin of the flat pack-IC on the CBA up.
  • Page 11 Instructions for Handling Semiconductors Electrostatic breakdown of the semiconductors may occur due to a potential difference caused by electro- static charge during unpacking or repair work. 1. Ground for Human Body Be sure to wear a grounding band (1MΩ) that is prop- erly grounded to remove any static electricity that may be charged on the body.

  • Page 12: 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 13 [3] Main CBA ANT.IN [1] Rear Cabinet Fig. 3 Fig. 1 [2] CRT CBA Anode Cap [1] Rear Cabinet [4] CRT Fig. 4 Fig. 2 L6552DC...
  • Page 14 TV Cable Wiring Diagram SP801 SP802 DG691 DEGAUSSING COIL CLN802 CLN801 MAIN CBA CN801 CN802 WH301A CN691 FLYBACK TRANSFORMER TUNER T571 WH501A CN571 AC601 AC CORD FOCUS JK1501 SCREEN WH301B WH501B ANODE CN1501 Fig. 5 TO CRT GROUND L6552DC...

  • Page 15: Electrical Adjustment Instructions

    ELECTRICAL ADJUSTMENT INSTRUCTIONS 1. DC 120V Adjustment General Note: "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 16 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 17 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 18 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 19 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 20 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 21 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 22: Block Diagram

    BLOCK DIAGRAMS System Control Block Diagram L6552BLS...
  • Page 23 IF/Video Block Diagram L6552BLIF...
  • Page 24 Audio Block Diagram L6552BLA...
  • Page 25 CRT/H.V. Block Diagram L6552BLCRT...
  • Page 26 Power Supply Block Diagram L6552BLP...

  • Page 27: 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 28 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 29 Main 1/4 Schematic Diagram VIDEO SIGNAL MAIN 1/4 Ref No. Position IC111 IC151 TRANSISTORS Q111 Q321 Q361 L6552SCM1...
  • Page 30 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 L6552SCM2...
  • Page 31 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 32 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 Q531 CN571 VARIABLE RESISTORS Q1532 WH301A VR561 CONNECTORS Q532 Q551 WH501A...
  • Page 33 Main CBA Top View CAUTION: FOR CONTINUED PROTECTION AGAINST RISK BECAUSE A HOT CHASSIS GROUND IS PRESENT IN THE POWER MAIN CBA OF FIRE, REPLACE ONLY WITH SAME TYPE 4A, 125V FUSE. Ref No. Position SUPPLY CIRCUIT, AN ISOLATION TRANSFORMER MUST BE USED. CAUTION ! ATTENTION: UTILISER UN FUSIBLE DE RECHANGE DE 4A/125V...
  • Page 34 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 35 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 WF15 WF14 WF13 Q1512 Q1512 Q1522 Q1522 Q1532 Q1532 TP1501 Collector Collector Base Base Collector Base TP1502 BLUE...

  • Page 36: Waveforms

    WAVEFORMS WF1 ~ WF16 = Waveforms to be observed at Waveform check points. (Shown in Schematic Diagram.) 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. (Brightness---Center Color---Center Tint --- Center Contrast---Approx 70%) 1DIV: 2V 20µs 1DIV: 0.5V 20µs...
  • Page 37 WF1 ~ WF16 = Waveforms to be observed at Waveform check points. (Shown in Schematic Diagram.) 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. (Brightness---Center Color---Center Tint --- Center Contrast---Approx 70%) 1DIV: 200V 20µs WF13...

  • 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 BL6600F01013-1 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 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 40 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 41 EXPLODED VIEWS Cabinet SHINWHA TAPE SGT-730 V501-1 (BLACK) Details for DY551 and surrounding parts SHINWHA TAPE SGT-730 (WHITE) DY551 V501-2 Scotch Tape #880 CLN551 DY551 CLN801 CRT CBA DG691 SP801 Scotch Tape #880 V501 CLN802 AC601 SP802 MAIN CBA See Electrical Parts List for parts with this mark.
  • Page 42 Packing 11-3 L6552PEX...

  • 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 Note: replacing any of these components, read carefully the 1. V501 (CRT) HAS COUPLE OF SUBSTITUTIONAL PARTS AND EACH PARTS ALSO HAS MATCHING COMBINATION WITH DY551.
  • Page 44 CRT Warning Label Location CRT Type No. CRT Warning Label 20040715 12-2 L6552CA...

  • Page 45: 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) 0.033µF/50V J or CMA1JJS00333 Before replacing any of these components, read care- FILM CAP .(P) 0.033µF/50V J CA1J333MS029 fully the product safety notice in this service manual.
  • Page 46 Ref. No. Description Part No. Ref. No. Description Part No. C347 ELECTROLYTIC CAP . 470µF/10V M or CE1AMASTL471 ELECTROLYTIC CAP . 470µF/35V M or CE1GMZNDL471 ELECTROLYTIC CAP . 470µF/10V M CE1AMASDL471 ELECTROLYTIC CAP . 470µF/35V M CE1GMZPDL471 C349 ELECTROLYTIC CAP . 470µF/10V M or CE1AMASTL471 C551 PCB JUMPER D0.6-P5.0...
  • Page 47 Ref. No. Description Part No. Ref. No. Description Part No. C615 CERAMIC CAP .(AX) B K 100pF/50V CCA1JKT0B101 C803 FILM CAP .(P) 0.1µF/50V J or CMA1JJS00104 C616 FILM CAP .(P) 0.1µF/50V J or CMA1JJS00104 FILM CAP .(P) 0.1µF/50V J CA1J104MS029 FILM CAP .(P) 0.1µF/50V J CA1J104MS029 C804...
  • Page 48 Ref. No. Description Part No. Ref. No. Description Part No. SWITCHING DIODE 1N4148 NDTZ001N4148 D615# SWITCHING DIODE 1N4148 T-77 QDTZ001N4148 D353 SWITCHING DIODE 1SS133(T-77) or QDTZ001SS133 D621 ZENER DIODE MTZJT-777.5B or QDTB0MTZJ7R5 SWITCHING DIODE 1N4148 NDTZ001N4148 ZENER DIODE DZ-7.5BSBT265 NDTB0DZ7R5BS D525# ZENER DIODE MTZJT-7720B or QDTB00MTZJ20...
  • Page 49 Ref. No. Description Part No. Ref. No. Description Part No. IC31 IC:VIF/SIF DETECTOR M61111FP QSZBA0SMB010 TRANSISTOR 2SC3331(T)-AANP or 2SC3331TZ IC111# IC M61271M8-050FP-71 or QSZAC0RMB127 TRANSISTOR 2SC3331(U)-AANP or 2SC3331UZ IC M61271M8-050FP-61 QSZAB0RMB127 TRANSISTOR 2SC1815-GR(TPE2) QQS102SC1815 IC151 IC:MEMORY S524C20D21 or NSZBA0SSM028 Q321# TRANSISTOR 2SC2785(F) or QQSF02SC2785 IC:MEMORY AT24C02N-10SC or...
  • Page 50 Ref. No. Description Part No. Ref. No. Description Part No. Q552# TRANSISTOR 2SD1666R or QQER02SD1666 TRANSISTOR 2SC3331(U)-AANP or 2SC3331UZ TRANSISTOR 2SD1666S or QQES02SD1666 TRANSISTOR 2SC1815-GR(TPE2) QQS102SC1815 TRANSISTOR KTD2059(O) or NQ400KTD2059 Q681 TRANSISTOR 2SC2120-O-TPE2 or QQS002SC2120 TRANSISTOR KTD2059(Y) or NQ4Y0KTD2059 TRANSISTOR 2SC2120-Y(TPE2) or QQSY02SC2120 TRANSISTOR 2SD1825 Q2SD1825****...
  • Page 51 Ref. No. Description Part No. Ref. No. Description Part No. CARBON RES. 1/4W J 8.2k Ω CARBON RES. 1/4W J 220 Ω R106 RCX4JATZ0822 R432 RCX4JATZ0221 CARBON RES. 1/4W J 100 Ω CARBON RES. 1/4W J 470 Ω R111# RCX4JATZ0101 R435 RCX4JATZ0471 CARBON RES.
  • Page 52 Ref. No. Description Part No. Ref. No. Description Part No. METAL OXIDE FILM RES. 2W J 2.2 Ω or CARBON RES. 1/4W J 10k Ω R583# RN022R2ZU001 R676 RCX4JATZ0103 METAL OXIDE FILM RES. 2W J 2.2 Ω CARBON RES. 1/4W J 68k Ω RN022R2DP004 R677 RCX4JATZ0683...
  • Page 53 Ref. No. Description Part No. Ref. No. Description Part No. TACT SWITCH KSM0612B or SST0101HH003 JK801 HEADPHONE JACK MSJ-035-10A B or JYSL020LY002 TACT SWITCH SKHHAM or SST0101AL029 HEADPHONE JACK DP3-26-7-001 JYSL020RP001 TACT SWITCH TC-1104(H=5.0) SST0101DNG02 JS102 PCB JUMPER D0.6-P5.0 JW5.0T SW103 TACT SWITCH SKQSAB or SST0101AL038...
  • Page 54 Ref. No. Description Part No. CONNECTOR CN1501 PIN CONNECTOR 005P-5100 JTEA001TG001 DIODES D1511 SWITCHING DIODE 1SS133(T-77) or QDTZ001SS133 SWITCHING DIODE 1N4148 NDTZ001N4148 D1521 SWITCHING DIODE 1SS133(T-77) or QDTZ001SS133 SWITCHING DIODE 1N4148 NDTZ001N4148 D1531 SWITCHING DIODE 1SS133(T-77) or QDTZ001SS133 SWITCHING DIODE 1N4148 NDTZ001N4148 COILS L1511...
  • Page 55 ST423E L6552UC 2004-07-20...

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