1. Manuals
  2. Brands
  3. Sylvania Manuals
  4. TV
  5. 6420FF
  6. Service manual

Sylvania 6420FF Service Manual

20" color television
Hide thumbs Also See for 6420FF:
Table of Contents

Advertisement

Quick Links

Download this manual
SERVICE MANUAL
20" COLOR TELEVISION
6420FF

Advertisement

Table of Contents
loading

Related Manuals for Sylvania 6420FF

Summary of Contents for Sylvania 6420FF

  • Page 1 SERVICE MANUAL 20″ COLOR TELEVISION 6420FF...

  • 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 (S-1) (S-1) (S-1) [3] Main CBA (S-1) (S-2) (S-4) [1] Rear Cabinet Fig. D1 Fig. D3 [2] CRT CBA (S-1) Anode Cap (S-1) (S-3) (S-2) (S-3) (S-4) (S-1) (S-3) (S-1) (S-1) [1] Rear Cabinet (S-3) [4] CRT Fig. D2 Fig. D4 L3300DC...
  • 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 L3300DC...

  • 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 12. Cut-off Adjustment Cut off by pressing [CH o / p] buttons. Proceed to step 6 when the Green Cut off adjustment is done. Purpose: To adjust the beam current of R, G, B, and 6. Press [3] button. The display will momentarily screen voltage.
  • Page 20 6. Press [4] button on the service remote control unit 3. Turn the power off and on again. (Main power for Red adjustment. Press [5] button on the button on the TV unit.) service remote control unit for Blue adjustment. 15.
  • Page 21 3. Fully degauss unit using an external Figure degaussing coil. 4. Loosen the screw on the Deflection Yoke Clamper and pull the Deflection Yoke back away from the COIL PURITY RB-G SCREW screen. (See Fig. 6) RING LOCK 5. Loosen the Ring Lock and adjust the Purity SCREW Magnets so that a red field is obtained at the center of the screen.

  • Page 22: How To Initialize The Televition

    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 23: Block Diagrams

    BLOCK DIAGRAMS System Control Block Diagram L3300BLS...
  • Page 24 IF/Video Block Diagram L3300BLIF...
  • Page 25 Audio Block Diagram L3300BLA...
  • Page 26 CRT/H.V. Block Diagram L3300BLCRT...
  • Page 27 Power Supply Block Diagram L3300BLP...

  • Page 28: 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 29 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 30 Main 1/4 Schematic Diagram MAIN 1/4 Ref No. Position IC111 IC151 TRANSISTORS Q111 Q131 Q161 Q321 Q361 L3300SCM1...
  • Page 31 Main 2/4 Schematic Diagram MAIN 2/4 Ref No. Position IC431 IC771 IC801 TRANSISTORS Q801 Q811 CONNECTORS CN801 CN802 L3300SCM2...
  • Page 32 Main 3/4 Schematic Diagram NOTE: CAUTION ! The voltage for parts in hot circuit is measured using Fixed voltage ( or Auto voltage selectable ) power supply circuit is used in this unit. CAUTION ! : For continued protection against risk of fire, hot GND as a common terminal.
  • Page 33 Main 4/4 & CRT Schematic Diagram MAIN 4/4 Ref No. Position Ref No. Position TRANSISTORS Q1511 IC551 Q1521 TRANSISTORS Q1531 Q571 CONNECTORS Q572 CN1501 CONNECTORS WH301B CN571 WH501B WH301A WH501A TEST POINT TP601 L3300SCM4...
  • Page 34 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. supply circuit, an isolation transformer must be used. CAUTION ! : For continued protection against risk of fire, If Main Fuse(F601)is blown , check to see that all components in the power supply...
  • Page 35 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. supply circuit, an isolation transformer must be used. CAUTION ! : For continued protection against risk of fire, If Main Fuse(F601)is blown , check to see that all components in the power supply...
  • Page 36 CRT CBA Top View CRT CBA Bottom View CRT CBA Ref No. Position TRANSISTORS Q1511 Q1521 Q1531 CONNECTORS CN1501 WH301B WF14 WF15 WH501B Q1521 Q1521 Q1511 Q1511 Collector Base Collector Base Q1531 Base WF13 Q1531 Collector BL3700F01011-2...

  • Page 37: 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 38 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 39: 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 BL3700F01011-1 CN691 FOCUS CN1501 T571 SCREEN WH301B WH301A CLN301 BLUE BLUE GREEN GREEN WH501B WH501A CLN501 CRT CBA HEATER 3...

  • Page 40: 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 41 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 INPUT-1 Input Select 1 11-2 L3300PIN...

  • Page 42: Exploded Views

    EXPLODED VIEWS Cabinet SHINWHA TAPE SGT-730 V501-1 (BLACK) V501-2 Details for DY551 and surrounding parts SHINWHA TAPE SGT-730 DY551 (WHITE) L-10 Scotch Tape #880 B-11 CLN801 CLN551 DY551 L-13 CRT CBA B-11 SP801 DG691 Scotch Tape #880 V501 AC601 CLN802 L-13 MAIN CBA SP802...
  • Page 43 Packing Tape Packing tape 12-2 L3300PEX...

  • Page 44: Mechanical Parts List

    MECHANICAL PARTS LIST PRODUCT SAFETY NOTE: Products marked with a # have special characteristics important to safety. Before replacing any of these components, read carefully the product safety notice in this service manual. Don't degrade the safety of the product through improper servicing.

  • 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. C117 CERAMIC CAP .(AX) Y K 0.01µF/16V CCA1CKT0Y103 Before replacing any of these components, read C122 ELECTROLYTIC CAP . 100µF/10V M CE1AMASDL101 carefully the product safety notice in this service C132...
  • Page 46 Ref. No. Description Part No. Ref. No. Description Part No. C574# ELECTROLYTIC CAP . 4.7µF/250V M CE2EMASDL4R7 DIODES C577 ELECTROLYTIC CAP . 47µF/35V M CE1GMASDL470 D101 SWITCHING DIODE 1SS133(T-77) QDTZ001SS133 C578 FILM CAP .(P) 0.01µF/50V J CMA1JJS00103 D102 SWITCHING DIODE 1SS133(T-77) QDTZ001SS133 C580# P .P .
  • Page 47 Ref. No. Description Part No. Ref. No. Description Part No. CHIP RES.(1608) 1/10W J 100k Ω IC801 IC AN17812A QSZBA0SMS017 R136 RRXAJB5Z0104 CHIP RES.(1608) 1/10W J 100 Ω COILS R137 RRXAJB5Z0101 CHIP RES.(1608) 1/10W J 220k Ω R138 RRXAJB5Z0224 INDUCTOR 22µH-K-5FT LLARKBSTU220 CARBON RES.
  • Page 48 Ref. No. Description Part No. Ref. No. Description Part No. CARBON RES. 1/4W J 470 Ω CARBON RES. 1/4W J 47k Ω R535 RCX4JATZ0471 R670# RCX4JATZ0473 CARBON RES. 1/4W J 820 Ω CARBON RES. 1/4W J 3.3k Ω R541 RCX4JATZ0821 R671 RCX4JATZ0332 CARBON RES.
  • Page 49 Ref. No. Description Part No. Ref. No. Description Part No. SW106 TACT SWITCH SKQSAB SST0101AL038 CONNECTOR MISCELLANEOUS CN1501 PIN CONNECTOR 005P-5100 JTEA001TG001 AC601# AC CORD LA-2366 WAC0172LW006 DIODES HEAT SINK L3300UZ 1EM420611 D1502 RECTIFIER DIODE ERA15-02 AERA1502**** HEAT SINK(PIH)ASSEMBLY L2405UF 0EM408978 D1511 SWITCHING DIODE 1SS133(T-77)
  • Page 50 6420FF L3300UA 2005-01-08...

Table of Contents