Sylvania 6427FF Service Manual
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Sylvania 6427FF Service Manual

Sylvania 6427FF Service Manual

27" color television
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SERVICE MANUAL

27" COLOR TELEVISION
6427FF/EWF2705

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Summary of Contents for Sylvania 6427FF

  • Page 1: Service Manual

    SERVICE MANUAL 27″ COLOR TELEVISION 6427FF/EWF2705...

  • 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 Front Cabinet [3] Main CBA Control Plate [1] Rear Cabinet Fig. D1 Fig. D3 Degaussing Coil Anode Cap [2] CRT Ground Wire [1] Rear Cabinet Front Front Cabinet Cabinet [4] CRT Control Plate Control Plate Fig. D2 Fig. D4 L3800DC...

  • Page 14: Wiring Diagram

    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 L3800DC...

  • Page 15: Electrical Adjustment Instructions

    Version of micro computer will display the proper equipment is available. on the CRT. (Ex: 059-0.01) 4. 6427FF: Test Equipment Required Check the display on the lower left is “3652” and if it is not “3652” set it at “3652” according to "Initial 1.

  • Page 16: Initial Setting

    V-OUT --- Set to “OFF.” VIDEO 1. Press [MENU] button on the service remote 6427FF --- Set to “V1/V2/YUV.” control unit. Then select “TINT” (TNT) display. EWF2705 --- Set to “V1/V2.” 2. Press [CH o / p] buttons on the service remote AV MEMO --- Set to “OFF.”...
  • Page 17 Red mode, Green control unit and select “42.” mode, Blue mode, and White mode cyclically. C-SRP (6427FF only) 3. Select White mode. 1. Press [MENU] button on the service remote 4. Turn the power off and on again. (Main power control unit.
  • Page 18 TV unit.) button on the TV unit.) 9. V. Size Adjustment 11. U-Pedestal Adjustment (6427FF only) Purpose: To obtain correct vertical width of screen image. 1. In VIDEO mode of V1, V2, or YUV, press [3] button Symptom of Misadjustment: If V.

  • Page 19: Pin Cushion Adjustment

    13. Software Reset 16. Cut-off Adjustment To reset software, press [5] button on the remote Purpose: To adjust the beam current of R, G, B, and control unit for at least 5 seconds after pressing [CH screen voltage. RETURN] button on the remote control unit. Symptom of Misadjustment: White color may be reddish, greenish or bluish.

  • Page 20: White Balance Adjustment

    6. Press [3] button. The display will momentarily 7. In each color mode, Press [CH o / p] buttons to show “CUT OFF B” (B = Blue). Adjust the Blue cut adjust the values of color. off by pressing [CH o / p] buttons. When done 8.

  • Page 21: Focus Adjustment

    19. Focus Adjustment 4. Loosen the screw on the Deflection Yoke Clamper and pull the Deflection Yoke back away from the Purpose: Set the optimum Focus. screen. (See Fig. 6) Symptom of Misadjustment: If Focus Adjustment is 5. Loosen the Ring Lock and adjust the Purity incorrect, blurred images are shown on the display.

  • Page 22: Convergence Adjustment

    22. 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 Symptom of Misadjustment: If Convergence 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 L3800BLS...
  • Page 25 IF/Video Block Diagram L3800BLIF...
  • Page 26 Audio Block Diagram L3800BLA...
  • Page 27 CRT/H.V. Block Diagram L3800BLCRT...
  • Page 28 Power Supply Block Diagram L3800BLP...

  • 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 CONNECTOR CN301 L3800SCM1...
  • Page 32 Main 2/4 Schematic Diagram MAIN 2/4 Ref No. Position IC431 IC771 IC801 TRANSISTORS Q751 Q761 Q791 Q792 Q793 Q794 Q801 Q811 CONNECTORS CN801 CN802 L3800SCM2...
  • 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 IC551 CN571 Q1511 TRANSISTORS WH301A Q1512 Q511 WH501A Q1521 Q512 TEST POINT Q1522 Q551 TP601 Q1531 Q552 VARIABLE RESISTORS Q1532 CONNECTORS Q561 VR561 Q571...
  • Page 35 Main CBA Top View CAUTION ! Because a hot chassis ground is present in the power supply circuit, an isolation transformer must be used. Fixed voltage (or Auto voltage selectable) power supply circuit is used in this unit. CAUTION ! : For continued protection against risk of fire, Also, in order to have the ability to increase the input If Main Fuse (F601) is blown , check to see that all components in the power supply...
  • 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 WH501B WF14 WF15 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

    T571 SCREEN WH301B WH301A CLN301 BLUE BLUE GREEN GREEN WH501B WH501A CLN501 CRT CBA HEATER 3 HEATER GND 2 +200V 1 +200V 6427FF (NO CONNECTION) CN301 INT-MONI CN301 IS USED FOR DY551 ADJUSTMENT AT D.Y. CN571 FACTORY. AC601 L3800WI 10-1...

  • Page 41: Ic Pin Function Descriptions

    IC PIN FUNCTION DESCRIPTIONS Comparison Chart of Models and Marks Mark Signal Name Function Model Mark C(Y/C) IN Chrominance Signal Input 6427FF Y(Y/C) IN Luminance Signal Input EWF2705 V REG VCC DC 8.7V Input FSC OUT Clock Output 3.58MHz IC111 (TV Micro Controller)
  • Page 42 Mark Signal Name Function N.U. Not Used N.U. Not Used KEY-IN 1 Key Input 1 (Main) PROTECT-2 Power Supply Protection PROTECT-1 Power Supply Protection KEY-IN 2 Key Input 2 (Main) RCV-IN Input For Remote Control N.U. Not Used White Balance I2C-OPEN Adjustment Judgement AFT-IN...

  • Page 43: Exploded Views

    EXPLODED VIEWS Cabinet SHINWHA V501-1 TAPE SGT-730 Details for DY551 (BLACK) and surrounding parts V501-2 SHINWHA TAPE SGT-730 (WHITE) L-10 B-11 DY551 L-10 Scotch Tape #880 B-20 L-13 CLN551 SP801 DY551 L-13 CRT CBA B-11 B-20 CLN801 DG691 B-20 Scotch Tape #880 V501 L-13 SP802...
  • Page 44 Packing Tape Packing tape Packing tape 12-2 L3800PEX...

  • Page 45: Mechanical Parts List

    RATING LABEL L3800UA ---------- V501# CRT A68LZU185X TCRT190MS017 A-4# RATING LABELL3801UB ---------- V501-1 PCM JH88DTA XM04000BV010 BRAND BADGE L L1520UA~SYLVANIA~ 0EM406577 V501-2 WEDGE FT-00110W XV10000T4001 BADGE L 0EM407162 BRANDTD351UB~EMERSON~ Table 1 (V501 and DY551 Combination) SPRING TENSION B0080B0:EM40808 26WH006 SCREW L1500UA...
  • Page 46 CRT Warning Label Location CRT Type No. CRT Warning Label 20050316 13-2 L3800CA...

  • Page 47: Electrical Parts List

    Comparison Chart of Models and Marks C305 ELECTROLYTIC CAP . 0.1µF/50V M CE1JMASDL0R1 Model Mark C306 ELECTROLYTIC CAP . 100µF/10V M CE1AMASDL101 6427FF C309 ELECTROLYTIC CAP . 0.1µF/50V M CE1JMASDL0R1 EWF2705 C311 ELECTROLYTIC CAP . 0.1µF/50V M CE1JMASDL0R1 C312 ELECTROLYTIC CAP . 0.1µF/50V M...
  • Page 48 Ref. No. Mark Description Part No. Ref. No. Mark Description Part No. C445 FILM CAP .(P) 0.1µF/50V J CMA1JJS00104 C705 CERAMIC CAP .(AX) X K 3900pF/16V CCA1CKT0X392 C446 FILM CAP .(P) 0.1µF/50V J CMA1JJS00104 C706 ELECTROLYTIC CAP . 0.47µF/50V M CE1JMASDLR47 C448 ELECTROLYTIC CAP .
  • Page 49 Ref. No. Mark Description Part No. Ref. No. Mark Description Part No. D594# SWITCHING DIODE 1SS133(T-77) QDTZ001SS133 Q321 TRANSISTOR 2SC2785(F) QQSF02SC2785 D595# SWITCHING DIODE 1SS133(T-77) QDTZ001SS133 Q511 RES. BUILT-IN TRANSISTOR BA1F4M-T QQSZ00BA1F4M D597 ZENER DIODE MTZJT-776.8B QDTB0MTZJ6R8 Q512 RES. BUILT-IN TRANSISTOR BA1F4M-T QQSZ00BA1F4M D605# DIODE 1N5406 NDLZ001N5406...
  • Page 50 Ref. No. Mark Description Part No. Ref. No. Mark Description Part No. CHIP RES. 1/10W J 0 Ω CARBON RES. 1/4W J 820 Ω R150 RRXAJB5Z0000 R542 RCX4JATZ0821 CARBON RES. 1/4W J 100 Ω CARBON RES. 1/4W J 820 Ω R153 RCX4JATZ0101 R543...
  • Page 51 Ref. No. Mark Description Part No. Ref. No. Mark Description Part No. CARBON RES. 1/4W J 180 Ω CHIP RES.(1608) 1/10W J 22k Ω R655 RCX4JATZ0181 R751 RRXAJB5Z0223 CHIP RES.(1608) 1/10W J 15k Ω CARBON RES. 1/4W J 27k Ω R656 RRXAJB5Z0153 R752...
  • Page 52 Ref. No. Mark Description Part No. Ref. No. Mark Description Part No. CHIP RES. 1/10W J 0 Ω JC303 RRXAJB5Z0000 Q1522 TRANSISTOR 2SC5360 QQ9Z02SC5360 CHIP RES. 1/10W J 0 Ω JC304 RRXAJB5Z0000 Q1531 TRANSISTOR 2SC2785(F) QQSF02SC2785 CHIP RES. 1/10W J 0 Ω JC703 RRXAJB5Z0000 Q1532...
  • Page 53 6427FF/EWF2705 L3800UA/01UB 2005-04-01...

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