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Emerson EWT19S3 Service Manual

19” color television
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SERVICE MANUAL
19" COLOR TELEVISION
EWT19S3

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Summary of Contents for Emerson EWT19S3

  • Page 1 SERVICE MANUAL 19” COLOR TELEVISION EWT19S3...

  • 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: 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 Front Cabinet [3] Main CBA Control Plate [1] Rear Cabinet Fig. 3 Fig. 1 Anode Cap. [1] Rear Cabinet Degaussing Degauss Holder Coil [2] CRT Ground Wire Front Cabinet Front Cabinet Degauss Holder [4] CRT Control Plate Control Plate Fig. 2 Fig.
  • Page 13 TV Cable Wiring Diagram SP802 SP801 L691 DEGAUSSING COIL CLN802 CLN801 MAIN CBA CN802 CN801 WH301A CN691 FLYBACK TRANSFORMER TUNER T571 CN571 WH501A AC601 AC CORD FOCUS JK501 SCREEN WH301B WH501B ANODE CN501 TO CRT GROUND Fig. 5 L6406DC...

  • Page 14: Electrical Adjustment Instructions

    ELECTRICAL ADJUSTMENT INSTRUCTIONS How to set up the service mode: General Note: "CBA" is abbreviation for "Circuit Board Assem- Service mode: bly." 1. Use the service remote control unit. NOTE: 2. Turn the power on. (Use main power on the TV unit.) Electrical adjustments are required after replacing circuit components and certain mechanical parts.
  • Page 15 2. Black Stretch Control Adjustment 3-2. Setting for CONTRAST, COLOR, TINT, V-TINT and Purpose: To show the fine black color. SHARP data Values Symptom of Misadjustment: Black color will not appear correctly. General Note: Use service remote control unit. 1. Enter the Service mode. (See page 5-1) 1.
  • Page 16 4. Black Level Adjustment 6. V. Position Adjustment Purpose: Set Black Level Purpose: To obtain correct vertical width of screen image. Symptom of Misadjustment: If Black level is incor- Symptom of misadjustment: If V. Position is incor- rect, Proper brightness can not be obtained by adjust- rect, vertical height of image on the screen may not be ing the Brightness Control.
  • Page 17 8. Cut-off Adjustment 9. White Balance Adjustment Purpose: To adjust the beam current of R, G, B, and Purpose: To mix red, green and blue beams correctly for pure white. screen voltage. Symptom of Misadjustment: White becomes bluish Symptom of Misadjustment: White color may be or reddish.
  • Page 18 Note: Confirm that Cut Off Adj. is correct after this 3. Input the Monoscope Pattern. adjustment, and attempt Cut Off Adj. if needed. 4. Adjust the Focus Control on the FBT to obtain clear picture. 10. Sub-Brightness Adjustment The following 2 adjustments normally are not Purpose: To get proper brightness.
  • Page 19 13. Convergence Adjustment Purpose: To obtain proper convergence of red, green and blue beams. Symptom of Misadjustment: If Convergence Adjust- ment is incorrect, the edge of white letters may have color edges. Test Point Adj. Point Mode Input C.P . Magnet Dot Pattern (RB,) C.P .

  • Page 20: 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 (NO CONNECTION) CN301 I2C-OPEN CN301 is used for adjustment at factory IC151 (MEMORY) 72 I2C-OPEN SCL 6 SDA 5 FROM/TO IF/VIDEO BLOCK AGC-IN EXT-H IF/VIDEO BLOCK...
  • Page 21 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 VCO F/B IF AGC DET EXT.CLK FROM/TO EXT-H SYSTEM WF16 CONTROL BLOCK IC111 X301 TV MICON/VIDEO 3.58MHz /AUDIO/CHROMA...
  • Page 22 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 SPEAKER L-CH CN801 SP-L 1 SP-GND 2 IC731 (INPUT SELECT) IC802 (AUDIO AMP)
  • Page 23 CRT/H.V. Block Diagram VIDEO SIGNAL IC551 (V-DEFLECTION CONTROL) MAIN CBA WF12 THERMAL DY551 D.Y. WF11 PROTECTION V-DRIVE DRIVE V-RAMP-F/B FROM/TO PULSE DRIVE IF/VIDEO BLOCK CN571 Q572 Q571 T572 H-DRIVE H.DRIVE H.OUTPUT FROM POWER DEF+B SUPPLY BLOCK T571 F.B.T. FOCUS VR ANODE X-RAY J121...
  • Page 24 Power Supply Block Diagram CAUTION ! CAUTION: FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, Fixed voltage ( or Auto voltage selectable ) power supply circuit is used in this unit. REPLACE ONLY WITH SAME TYPE 4 A, 125V FUSE. If Main Fuse (F601) is blown, check to see that all components in the power supply 4A/125V ATTENTION: UTILISER UN FUSIBLE DE RECHANGE DE MÊME TYPE DE 4A, 125V.

  • Page 25: 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 26 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 27 Main 1/4 Schematic Diagram VIDEO SIGNAL MAIN 1/4 Ref No. Position IC111 IC151 TRANSISTORS Q111 Q321 CONNECTOR CN301 L6406SCM1...
  • Page 28 Main 2/4 Schematic Diagram VIDEO SIGNAL AUDIO SIGNAL MAIN 2/4 Ref No. Position IC401 IC731 IC802 TRANSISTORS Q411 Q441 Q731 Q825 Q831 Q832 Q833 CONNECTORS CN801 CN802 L6406SCM2...
  • Page 29 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 30 Main 4/4 & CRT Schematic Diagram MAIN 4/4 Ref No. Position Ref No. Position Ref No. Position CONNECTORS TRANSISTORS WH501A IC551 Q501 TRANSISTORS TEST POINTS Q502 Q571 J121 Q503 Q572 J122 CONNECTORS CONNECTORS TP300 CN501 CN571 TP601 WH301B WH301A WH501B VIDEO SIGNAL 7-10 L6406SCM4...
  • Page 31 Main CBA Top View CAUTION ! BECAUSE A HOT CHASSIS GROUND IS PRESENT IN THE POWER CAUTION: FOR CONTINUED PROTECTION AGAINST RISK Fixed voltage ( or Auto voltage selectable ) power supply circuit is used in this unit. SUPPLY CIRCUIT, AN ISOLATION TRANSFORMER MUST BE USED. OF FIRE, REPLACE ONLY WITH SAME TYPE 4A, 125V FUSE.
  • Page 32 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 33 CRT CBA Top View CRT CBA Bottom View Ref No. Position TRANSISTORS Q501 Q502 Q503 CONNECTORS CN501 WH301B WH501B WF13 WF14 WF15 Q503 Q503 Q502 Q502 Q501 Q501 Collector Base Collector Base Collector Base 7-15 7-16 BL6406F01011-2...

  • Page 34: 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 35: 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 BL6406F01011-1 CN691 FOCUS CN1501 T571 SCREEN WH301B WH301A CLN301 BLUE BLUE GREEN GREEN WH501B WH501A CLN501 CRT CBA HEATER 3...

  • Page 36: 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 37 Signal Name Function 71 N.U. Not Used White Balance Adjustment 72 I2C OPEN Judgement 73 AFT AFT Voltage Input 74 N.U. Not Used 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 38 EXPLODED VIEWS Cabinet SHINWHA TAPE SGT-730 V501-1 (BLACK) Details for DY551 SHINWHA and surrounding parts TAPE SGT-730 DY551 (WHITE) V501-2 ANODE CAP Part of Flyback SCOTCH Transformer TAPE #880 CLN801 SCOTCH CLN551 TAPE #880 CLN802 SP801 DY551 SP802 CRT CBA DG691 SCOTCH TAPE #880...
  • Page 39 Packing Some Ref. Numbers are not in sequence. TAPE PACKING TAPE PACKING TAPE 11-3 L6406PEX...

  • Page 40: 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 41 Note 2: Please confirm CRT Type No. on the CRT Warning Label which is located on the CRT. Then See the Table 1 for V501 and DY551 combination chart. Please refer this CRT, Deflection Yoke combination chart for parts order. DY551: Deflection V501: CRT Type No.

  • Page 42: Electrical Parts List

    ELECTRICAL PARTS LIST PRODUCT SAFETY NOTE: Products marked with a Ref. No. Description Part No. # have special characteristics important to safety. PCB JUMPER D0.6-P5.0 JW5.0T Before replacing any of these components, read care- FILM CAP .(P) 0.047µF/50V J or CMA1JJS00473 fully the product safety notice in this service manual.
  • Page 43 Ref. No. Description Part No. Ref. No. Description Part No. C349 ELECTROLYTIC CAP . 470µF/10V M or CE1AMASTL471 FILM CAP .(P) 0.01µF/50V J CA1J103MS029 ELECTROLYTIC CAP . 470µF/10V M CE1AMASDL471 C580# PP CAP . 0.01µF/1.6KV J or CT3C103MS039 C353 ELECTROLYTIC CAP . 1µF/50V M or CE1JMASTL1R0 PP CAP .
  • Page 44 Ref. No. Description Part No. Ref. No. Description Part No. ELECTROLYTIC CAP . 1000µF/35V M or CE1GMZNDL102 STRAIGHT PIN HEADER, 2P 173981-2 1770258 DIODES ELECTROLYTIC CAP . 1000µF/35V M CE1GMZADL102 C667 ELECTROLYTIC CAP . 1µF/50V M or CE1JMASTL1R0 D111 ZENER DIODE MTZJT-775.6B or QDTB0MTZJ5R6 ELECTROLYTIC CAP .
  • Page 45 Ref. No. Description Part No. Ref. No. Description Part No. D616# ZENER DIODE MTZJT-7715B or QDTB00MTZJ15 IC401 IC:USA STEREO DECODER LA7765 QSZBA0SSY003 ZENER DIODE DZ-15BSBT265 NDTB00DZ15BS IC551# VERTICAL OUTPUT IC LA78040A or QSBBA0SSY003 D621 ZENER DIODE MTZJT-773.0B or QDTB0MTZJ3R0 VERTICAL OUTPUT IC AN5522 QSZBA0SMS002 ZENER DIODE DZ-3.0BSBT265 NDTB0DZ3R0BS...
  • Page 46 Ref. No. Description Part No. Ref. No. Description Part No. TRANSISTOR KTA1266(GR) or NQS40KTA1266 TRANSISTOR KTC3198(GR) or NQS40KTC3198 TRANSISTOR 2SA1015-GR(TPE2) QQS102SA1015 TRANSISTOR 2SC1815-GR(TPE2) QQS102SC1815 Q571# TRANSISTOR TT2140LS-YB11 or QQZZ00TT2140 RESISTORS TRANSISTOR 2SC5885000RF QQZZ02SC5885 PCB JUMPER D0.6-P5.0 JW5.0T CARBON RES. 1/4W J 100 Ω or Q572 TRANSISTOR 2SC1627Y-TPE2 QQSY02SC1627...
  • Page 47 Ref. No. Description Part No. Ref. No. Description Part No. CARBON RES. 1/4W J 8.2k Ω CARBON RES. 1/4W J 3.9 Ω R171 RCX4JATZ0822 R554# RCX4JATZ03R9 CARBON RES. 1/4W J 1k Ω or R172 PCB JUMPER D0.6-P5.0 JW5.0T R556 RCX4JATZ0102 CARBON RES.
  • Page 48 Ref. No. Description Part No. Ref. No. Description Part No. CARBON RES. 1/4W J 330 Ω or R623 RCX4JATZ0331 R811 PCB JUMPER D0.6-P5.0 JW5.0T CARBON RES. 1/6W J 330 Ω RCX6JATZ0331 R812 PCB JUMPER D0.6-P5.0 JW5.0T CARBON RES. 1/4W J 12k Ω R624 PCB JUMPER D0.6-P5.0 JW5.0T...
  • Page 49 CRT CBA Ref. No. Description Part No. FUSE 4.00A/125V PAGG20CNG402 Ref. No. Description Part No. FH601 FUSE HOLDER MSF-015 or XH01Z00LY001 CRT CBA ------------ FUSE HOLDER FH-V-03078 XH01Z00DK001 Consists of the following FH602 FUSE HOLDER MSF-015 or XH01Z00LY001 CAPACITORS FUSE HOLDER FH-V-03078 XH01Z00DK001 C501 CERAMIC CAP .(AX) B K 330pF/50V...
  • Page 50 Ref. No. Description Part No. CARBON RES. 1/4W J 1.5k Ω R538 RCX4JATZ0152 MISCELLANEOUS BC501 BEAD INDUCTORS FBR07HA121TB-00 LLBF00ZTU021 CLN501 PARALLEL WIRE 3P WX1L1114-101 JK501# CRT SOCKET ISMS02S JSCC220PK003 20030513 13-9 L6406EL...
  • Page 51 Printed in Japan 2003-05-24 HO...

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