Sylvania Symphonic ST424FF Service Manual
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Sylvania Symphonic ST424FF Service Manual

Sylvania Symphonic ST424FF Service Manual

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SERVICE MANUAL
24" COLOR TELEVISION
6424FF/ST424FF

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Summary of Contents for Sylvania Symphonic ST424FF

  • Page 1 SERVICE MANUAL 24″ COLOR TELEVISION 6424FF/ST424FF...

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

  • 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 Also, because the picture tube shields and an isolation transformer only if the AC power mounting hardware perform an X-radiation plug is inserted so that the chassis is protection function, they must be correctly in connected to the ground side of the AC power place.
  • Page 6 of the countries in which they are to be sold. 3) Align the lengths of the wires to be connected. However, in order to maintain such compliance, it Insert the wires fully into the connector. is equally important to implement the following 4) Use the crimping tool to crimp the metal sleeve precautions when a set is being serviced.
  • Page 7 Safety Check after Servicing Examine the area surrounding the repaired location for damage or deterioration. Observe that screws, parts and wires have been returned to original positions. Afterwards, perform the following tests and confirm the specified values in order to verify compliance with safety standards. 1.

  • Page 8: Standard Notes For Servicing

    STANDARD NOTES FOR SERVICING Circuit Board Indications How to Remove / Install Flat Pack-IC 1. The output pin of the 3 pin Regulator ICs is 1. Removal indicated as shown. With Hot-Air Flat Pack-IC Desoldering Machine: Top View Bottom View 1.
  • 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 all pins of the flat pack-IC.
  • Page 10 2. Installation With Iron Wire: 1. Using desoldering braid, remove the solder from 1. Using desoldering braid, remove the solder from all pins of the flat pack-IC. When you use solder the foil of each pin of the flat pack-IC on the CBA flux which is applied to all pins of the flat pack-IC, so you can install a replacement flat pack-IC more you can remove it easily.
  • Page 11 Instructions for Handling Semi- conductors Electrostatic breakdown of the semi-conductors may occur due to a potential difference caused by electrostatic charge during unpacking or repair work. 1. Ground for Human Body Be sure to wear a grounding band (1 MΩ) that is properly grounded to remove any static electricity that may be charged on the body.

  • Page 12: 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 13 [3] Main CBA ANT. IN [1] Rear Cabinet Fig. D1 Fig. D3 [2] CRT CBA Anode Cap [1] Rear Cabinet [4] CRT Fig. D2 Fig. D4 L3420DC...
  • Page 14 TV Cable Wiring Diagram DG691 DEGAUSSING COIL SP802 SP801 MAIN CBA CLN802 CLN801 CN802 CN801 CN691 WH301A TU11 FLYBACK TUNER TRANSFORMER CN571 T571 WH501A TO CRT GROUND AC601 WH501B AC CORD CN1501 FOCUS JK1501 SCREEN WH301B ANODE Fig. D5 L3420DC...

  • Page 15: Electrical Adjustment Instructions

    ELECTRICAL ADJUSTMENT INSTRUCTIONS General Note: “CBA” is abbreviation for How to set up the service mode: “Circuit Board Assembly.” Service mode: Note: Electrical adjustments are required after 1. Use the service remote control unit. replacing circuit components and certain mechanical parts. It is important to perform 2.
  • Page 16 2. Initial Setting 1. Press [MENU] button on the service remote General control unit. Then select “COLOR” (CLR) display. 1. Enter the Service mode. (See page 5-1.) 2. Press [CH o / p] buttons on the service remote 2. Press [VOL p] button on the service remote control unit so that the value of “COLOR”...
  • Page 17 4. H f Adjustment 7. SD Check Mode 1. Enter the Service mode. (See page 5-1.) Purpose: To get correct horizontal frequency. 2. Press [1] button on the remote control unit. The Note: Use service remote control unit. unit enter the SD-Check mode. 1.
  • 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 screen image. image. Symptom of Misadjustment: If H. Position is Symptom of misadjustment: If V. Position is incorrect, horizontal position of image on the screen incorrect, vertical height of image on the screen may may not be properly displayed.
  • Page 19 13. PIN Cushion Adjustment 1. Degauss the CRT and allow CRT to operate for 20 minutes before starting the alignment. Purpose: To obtain correct straight vertical line of 2. Input the Black Raster Signal from RF Input. screen image. 3. Enter the Service mode. (See page 5-1.) Symptom of Misadjustment: If H.Pin cushion is 4.
  • Page 20 15. White Balance Adjustment 9. At this time, Re-check that Horizontal line is white. If not, Re-adjust Cut-off Adjustment until the Purpose: To mix red, green and blue beams correctly Horizontal Line becomes pure white. for pure white. 10. Turn off and on again to return to normal mode. Receive APL 100% white signal and Check Symptom of Misadjustment: White becomes bluish Chroma temperatures become 9200K (x: 286 / y:...
  • Page 21 17. Focus Adjustment The following 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 18. Purity Adjustment incorrect, blurred images are shown on the display. Purpose: To obtain pure color.
  • Page 22 19. Convergence Adjustment 4. Remove the DY Wedges and slightly tilt the Deflection Yoke horizontally and vertically to Purpose: To obtain proper convergence of red, green obtain the best overall convergence. and blue beams. 5. Fix the Deflection Yoke by carefully inserting the DY Wedges between CRT and Deflection Yoke.

  • Page 23: How To Initialize The Television

    HOW TO INITIALIZE THE TELEVISION To put the program back at the factory-default, initialize the television as the following procedure. 1. Use the service remote control unit. 2. Turn the power on. (Use main power on the TV unit.) 3. Press [SLEEP] button on the service remote control unit to enter the Service mode.

  • Page 24: Block Diagrams

    BLOCK DIAGRAMS System Control Block Diagram L3420BLS...
  • Page 25 IF/Video Block Diagram L3420BLIF...
  • Page 26 Audio Block Diagram L3420BLA...
  • Page 27 CRT/H.V. Block Diagram L3420BLCRT...
  • Page 28 Power Supply Block Diagram L3420BLP...

  • Page 29: Schematic Diagrams / 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 components rated for higher voltage, wattage, etc. Replacement parts that have these special safety characteristics are identified in this manual and its supplements;...
  • Page 30 LIST OF CAUTION, NOTES, AND SYMBOLS USED IN THE SCHEMATIC DIAGRAMS ON THE FOLLOWING PAGES: 1. CAUTION: 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 31 Main 1/4 Schematic Diagram MAIN 1/4 Ref No. Position IC111 IC151 TRANSISTORS Q111 Q131 Q161 Q321 Q361 L3420SCM1...
  • Page 32 Main 2/4 Schematic Diagram MAIN 2/4 Ref No. Position IC431 IC771 IC801 TRANSISTORS Q801 Q811 CONNECTORS CN801 CN802 L3420SCM2...
  • Page 33 Main 3/4 Schematic Diagram CAUTION ! NOTE: CAUTION ! : For continued protection against risk of fire, Fixed voltage (or Auto voltage selectable) power supply circuit is used in this unit. The voltage for parts in hot circuit is measured using replace only with same type 4 A, 125V fuse.
  • Page 34 Main 4/4 & CRT Schematic Diagram MAIN 4/4 Ref No. Position Ref No. Position Ref No. Position CONNECTORS TRANSISTORS CN571 IC551 Q1511 TRANSISTORS WH301A Q1512 Q511 WH501A Q1521 Q512 TEST POINT Q1522 Q551 TP601 Q1531 Q552 VARIABLE RESISTORS Q1532 Q561 VR561 CONNECTORS Q571...
  • Page 35 Main CBA Top View CAUTION ! Because a hot chassis ground is present in the power Fixed voltage (or Auto voltage selectable) power supply circuit is used in this unit. CAUTION ! : For continued protection against risk of fire, supply circuit, an isolation transformer must be used.
  • Page 36 Main CBA Bottom View CAUTION ! Because a hot chassis ground is present in the power Fixed voltage (or Auto voltage selectable) power supply circuit is used in this unit. CAUTION ! : For continued protection against risk of fire, supply circuit, an isolation transformer must be used.
  • Page 37 CRT CBA Top View CRT CBA Bottom View CRT CBA Ref No. Position TRANSISTORS Q1511 Q1512 Q1521 Q1522 Q1531 Q1532 CONNECTORS CN1501 WH301B WF14 WF15 WH501B Q1521 Q1521 Q1511 Q1511 Collector Base Collector Base Q1531 Base WF13 Q1531 Collector BL3700F01011-2...

  • Page 38: 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 39 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 40: 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 TU11 TUNER UNIT V501 MAIN CBA CN691 FOCUS CN1501 T571 SCREEN WH301B WH301A CLN301 BLUE BLUE GREEN GREEN WH501B WH501A CLN501 CRT CBA HEATER 3 HEATER...

  • Page 41: Ic Pin Function Descriptions

    IC PIN FUNCTION DESCRIPTIONS IC111 (TV Micro Controller) Signal Name Function Signal Name Function 38 V RAMP OUT Vertical Output 39 V RAMP CAP V Ramp OSC Capacitor CNVSS 8.7 VREG N.U. Not Used DC 8.7V Output N.U. Not Used 41 N.U.
  • Page 42 Signal Name Function 75 AGC AGC Voltage Input 76 PROTECT-3 Power Supply Protection 77 N.U. Not Used 78 N.U. Not Used 79 P-ON-H Output for P-ON-H 80 INPUT1 Input Select 1 11-2 L3420PIN...

  • Page 43: Exploded Views

    EXPLODED VIEWS Cabinet SHINWHA TAPE SGT-730 V501-1 (BLACK) V501-2 Details for DY551 and surrounding parts SHINWHA L-10 TAPE SGT-730 DY551 (WHITE) B-11 B-20 Scotch Tape #880 CLN551 DG691 CLN801 DY551 B-11 SP801 CRT CBA B-20 B-20 Scotch Tape #880 CLN802 V501 B-20 SP802...
  • Page 44 Packing Tape Packing tape 12-2 L3420PEX...

  • Page 45: Mechanical Parts List

    MECHANICAL PARTS LIST PRODUCT SAFETY NOTE: Products marked with a Ref. No. Mark Description Part No. # have special characteristics important to safety. Note: 1. V501 (CRT) HAS COUPLE OF SUBSTITUTIONAL PARTS AND EACH PARTS Before replacing any of these components, read ALSO HAS MATCHING COMBINATION WITH DY551.

  • Page 46: Electrical Parts List

    ELECTRICAL PARTS LIST PRODUCT SAFETY NOTE: Products marked with a Ref. No. Description Part No. # have special characteristics important to safety. C117 CERAMIC CAP .(AX) Y K 0.01µF/16V CCA1CKT0Y103 Before replacing any of these components, read C120 ELECTROLYTIC CAP . 100µF/10V M CE1AMASDL101 carefully the product safety notice in this service C122...
  • Page 47 Ref. No. Description Part No. Ref. No. Description Part No. C508 CERAMIC CAP .(AX) F Z 0.01µF/25V CCA1EZTFZ103 C808 ELECTROLYTIC CAP . 1µF/50V M CE1JMASDL1R0 C511 ELECTROLYTIC CAP . 100µF/10V M CE1AMASDL101 C809 ELECTROLYTIC CAP . 1µF/50V M CE1JMASDL1R0 C551 PCB JUMPER D0.6-P7.5 JW7.5T C811...
  • Page 48 Ref. No. Description Part No. Ref. No. Description Part No. CARBON RES. 1/4W J 22k Ω D676 ZENER DIODE MTZJT-7718A QDTA00MTZJ18 RCX4JATZ0223 CARBON RES. 1/4W J 100 Ω D685# SWITCHING DIODE 1SS133(T-77) QDTZ001SS133 R101 RCX4JATZ0101 CHIP RES.(1608) 1/10W J 1.5k Ω D686 SWITCHING DIODE 1SS133(T-77) QDTZ001SS133...
  • Page 49 Ref. No. Description Part No. Ref. No. Description Part No. CHIP RES.(1608) 1/10W J 100 Ω CARBON RES. 1/4W J 1k Ω R356 RRXAJB5Z0101 R595 RCX4JATZ0102 CHIP RES.(1608) 1/10W J 100 Ω R357 RRXAJB5Z0101 R596 PCB JUMPER D0.6-P5.0 JW5.0T CHIP RES.(1608) 1/10W J 100 Ω CARBON RES.
  • Page 50 Ref. No. Description Part No. Ref. No. Description Part No. CHIP RES.(1608) 1/10W J 12k Ω R706 RRXAJB5Z0123 FH601 FUSE HOLDER MSF-015 XH01Z00LY001 CHIP RES.(1608) 1/10W J 47k Ω R707 RRXAJB5Z0473 FH602 FUSE HOLDER MSF-015 XH01Z00LY001 CHIP RES.(1608) 1/10W J 15k Ω R708 RRXAJB5Z0153 GP642#...
  • Page 51 Ref. No. Description Part No. CHIP RES.(1608) 1/10W J 100 Ω R1502 RRXAJB5Z0101 CARBON RES. 1/4W J 100 Ω R1503 RCX4JATZ0101 METAL RESISTOR 3W J 10k Ω R1510# RN03103ZU001 CARBON RES. 1/4W J 1.5k Ω R1511 RCX4JATZ0152 CARBON RES. 1/4W J 1.5k Ω R1512 RCX4JATZ0152 CHIP RES.(1608) 1/10W J 100 Ω...
  • Page 52 6424FF/ST424FF L3420UA/25UF 2005-05-18...

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