Emerson EWT19S2 Service Manual
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Emerson EWT19S2 Service Manual

Emerson EWT19S2 Service Manual

19” color television
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SERVICE MANUAL

19" COLOR TELEVISION
EWT19S2

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Summary of Contents for Emerson EWT19S2

  • Page 1: Service Manual

    SERVICE MANUAL 19” COLOR TELEVISION EWT19S2...

  • 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- Primary Circuit Terminals tions. Afterwards, perform the following tests and con- 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 [4] CRT Control Plate Control Plate Fig. 2 Fig. 4 L6118DC...
  • Page 13 TV Cable Wiring Diagram SP802 SP801 L691 DEGAUSSING COIL CLN801 CLN802 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 L6118DC...

  • Page 14: Electrical Adjustment Instructions

    ELECTRICAL ADJUSTMENT INSTRUCTIONS General Note: 4. Then CPU version is 054-0.13: Check the display on the lower left is "00" and if it is not "00," set it at "CBA" is abbreviation for "Circuit Board Assem- bly." "00" according to "3-1 FRENCH, ACCESS CODE, VIDEO TONE."...
  • Page 15 3-1. Setting for 7F and FRENCH 3-2. Setting for CONTRAST, Data Values COLOR, TINT, V-TINT and SHARP Data Values General General 1. Enter the Service mode. (See page 5-1) 2. Press "VOL p" button on the Service remote con- 1. Enter the Service mode. (See page 5-1) trol unit.

  • Page 16: Vco Adjustment

    4. H f Adjustment 6. AGC Adjustment Purpose: Set AGC (Auto Gain Control) Level. Purpose: To get correct horizontal frequency. Symptom of Misadjustment: AGC does not syn- Symptom of Misadjustment: . If H f adjustment is in chronize correctly when RF input level is too weak and correct, skew distortion will appear on the screen.
  • Page 17 8. C-Trap Adjustment 9. V. Size Adjustment Purpose: To get minimum leakage of the color signal carrier. Purpose: To obtain correct vertical height of screen image. Symptom of Misadjustment: If C- Trap Adjustment Symptom of Misadjustment: If V. Size is incorrect, verti- is incorrect, stripes will appears on the screen.
  • Page 18 10. V. Position Adjustment 11. H. Position Adjustment Purpose: To obtain correct vertical height of screen Purpose: To obtain correct horizontal position of image. screen image. Symptom of misadjustment: If V. Position is incor- Symptom of Misadjustment: If H. Position is incor- rect, vertical height of image on the screen may not be rect, horizontal position of image on the screen may properly displayed.

  • Page 19: White Balance Adjustment

    12. Cut-off Adjustment 13. 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 20: Purity Adjustment

    14. Sub-Brightness Adjustment The following 2 adjustments normally are not attempted in the field. They should be done only Purpose: To get proper brightness. when replacing the CRT then adjust as a prepara- Symptom of Misadjustment: If Sub-Brightness is tion. incorrect, proper brightness cannot be obtained by 16.

  • Page 21: Convergence Adjustment

    17. 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 IF/Video/System Control Block Diagram RF/IF SIGNAL VIDEO SIGNAL AUDIO SIGNAL MAIN CBA TP301 TP300 IC333 VIDEO/AUDIO/CHROMA/DEFLECTION/IF CF302 4.5MHz TO AUDIO/POWER TU AUDIO CONTROL BLOCK DIAGRAM CF301 IF SIGNAL 4.5MHz CONTROL EXT.CLK FILTER TRAP WF16 CIRCUIT SERIAL IC151 MEMORY INTELLIGENT MONITORING IC111 TV MICON...
  • Page 23 Audio/Power Control Block Diagram AUDIO SIGNAL MAIN CBA JK702 A-IN(L) (FRONT) JK703 A-IN(R) (FRONT) SP802 Q411 BUFFER IC802 SPEAKER IC401 (R-CH AUDIO AMP) R-CH MTS/SAP AUDIO SIGNAL PROCESS CN802 SP-R 2 SP-GND 1 VOL. DEMOD MUTE IC333 VIDEO/AUDIO/CHROMA/DEFLECTION/IF TRAP SERIAL JK801 FROM/TO IF/VIDEO MATRIX...
  • Page 24 CRT/H.V. Block Diagram VIDEO SIGNAL IC551 V-DEFLECTION CONTROL MAIN CBA WF12 THERMAL DY551 D.Y. WF11 PROTECTION V-DRIVE DRIVE PROTECT-1 V.RAMP NF PULSE FROM/TO IF/VIDEO DRIVE /SYSTEM CONTROL BLOCK CN571 Q572 Q571 T572 H-DRIVE H.DRIVE H.OUTPUT PROTECT-2 FROM POWER DEF+B SUPPLY BLOCK T571 F.B.T.

  • Page 25: Power Supply Block Diagram

    Power Supply Block Diagram CAUTION NOTE : CAUTION ! FOR CONTINUED PROTECTION AGAINST FIRE HAZARD, Switching power supply circuit is used in this unit. The voltage for parts in hot circuit is measured using REPLACE ONLY WITH THE SAME TYPE FUSE. hot GND as a common terminal.

  • Page 26: 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 27 LIST OF CAUTION, NOTES, AND SYMBOLS USED IN THE SCHEMATIC DIAGRAMS ON THE FOLLOWING PAGES: 1. CAUTION: FOR CONTINUED PROTECTION AGAINST FIRE HAZARD, REPLACE ONLY WITH THE SAME TYPE FUSE. ATTENTION: POUR UNE PROTECTION CONTINUE LES RISQES D'INCELE N'UTILISER QUE DES FUSIBLE DE MEMO TYPE. RISK OF FIRE-REPLACE FUSE AS MARKED.
  • Page 28 Main 1/3 Schematic Diagram IF SIGNAL VIDEO SIGNAL AUDIO SIGNAL MAIN 1/3 Ref No. Position IC111 IC151 IC333 IC401 TRANSISTORS Q121 Q351 Q377 Q411 Q441 TEST POINTS TP300 TP301 CONNECTOR CN301 L6118SCM1...
  • Page 29 Main 2/3 & CRT Schematic Diagram CAUTION CAUTION ! FOR CONTINUED PROTECTION AGAINST FIRE HAZARD, BECAUSE A HOT CHASSIS GROUND IS PRESENT IN THE POWER Fixed voltage power supply circuit is used in this unit. REPLACE ONLY WITH THE SAME TYPE FUSE. If Main Fuse (F601) is blown, check to see that all components in the power supply SUPPLY CIRCUIT, AN ISOLATION TRANSFORMER MUST BE USED.
  • Page 30 Main 3/3 Schematic Diagram MAIN 3/3 AUDIO SIGNAL Ref No. Position IC801 IC802 TRANSISTORS Q825 Q831 Q832 Q833 CONNECTOR CN801 CN802 7-10 L6118SCM3...
  • Page 31 CRT CBA Top View CRT CBA Bottom View CRT CBA Ref No. Position TRANSISTORS Q501 Q502 Q503 TEST POINTS TP501 TP502 CONNECTORS CN501 WF13 WF14 WF15 WH301B TP1502 TP501 Q503 Q503 Q502 Q502 Q501 Q501 WH501B BLUE Collector Base Collector Base Collector Base...
  • Page 32 Main CBA Top View CAUTION CAUTION ! FOR CONTINUED PROTECTION AGAINST FIRE HAZARD, Fixed voltage power supply circuit is used in this unit. BECAUSE A HOT CHASSIS GROUND IS PRESENT IN THE POWER REPLACE ONLY WITH THE SAME TYPE FUSE. If Main Fuse (F601) is blown, check to see that all components in the power supply SUPPLY CIRCUIT, AN ISOLATION TRANSFORMER MUST BE USED.
  • Page 33 Main CBA Bottom View CAUTION CAUTION ! FOR CONTINUED PROTECTION AGAINST FIRE HAZARD, Fixed voltage power supply circuit is used in this unit. BECAUSE A HOT CHASSIS GROUND IS PRESENT IN THE POWER REPLACE ONLY WITH THE SAME TYPE FUSE. If Main Fuse (F601) is blown, check to see that all components in the power supply SUPPLY CIRCUIT, AN ISOLATION TRANSFORMER MUST BE USED.

  • 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 SP-GND SP801 SPEAKER SP-L L-CH CN802 CLN802 SP-GND SP802 SP-R SPEAKER R-CH ANODE TU1 TUNER UNIT V501 MAIN CBA BL6118F01011-1 CN691 CLN551 FOCUS CN501 T571 SCREEN WH301B WH301A CLN301 GREEN GREEN BLUE BLUE WH501B WH501A CLN501 CRT CBA +180V +180V...

  • Page 36: Ic Pin Function

    IC PIN FUNCTIONS IC111(TV Micro Computer) Signal Name Function Signal Name Function OSD-G Green Output OSD-B Blue Output N.U. Not Used Input For Vertical VOLUME Volume PWM Output V-SYNC Synchronize Signal EXT-H Ext-H Input For Horizontal H-SYNC N.U. Not Used Synchronize Signal KEY-IN 1 Key Input 1 (Main)

  • Page 37: Electrical Parts List

    EXPLODED VIEWS Cabinet SHINWHA TAPE SGT-730 V501-1 (BLACK) Details for DY551 and surrounding parts SHINWHA TAPE SGT-730 (WHITE) DY551 V501-2 ANODE CAP SCOTCH Part of Flyback TAPE #880 Transformer CLN801 B-11 SCOTCH CLN551 DG691 TAPE #880 L-13 CLN802 SP801 DY551 L-13 B-15 CRT CBA...
  • Page 38 Packing Some Ref. Numbers are not in sequence. TAPE PACKING TAPE 11-3 L6115PEX...

  • Page 39: Mechanical Parts List

    MECHANICAL PARTS LIST PRODUCT SAFETY NOTE: Products marked with a Ref. No. Description Part No. # have special characteristics important to safety. Note: Before replacing any of these components, read care- 1. V501 (CRT) HAS COUPLE OF SUBSTITUTIONAL PARTS AND EACH PARTS ALSO HAS MATCHING COMBINATION WITH DY551.
  • Page 40 Table 1 (V501 and DY551 Combination) Note 1: Purity and Convergence Adjustments must be performed following CRT replacement. Refer to Electri- cal Adjustment Instructions. 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.

  • Page 41: Electrical Parts List

    ELECTRICAL PARTS LIST PRODUCT SAFETY NOTE: Products marked with a Ref. No. Description Part No. # have special characteristics important to safety. C301 CERAMIC CAP.(AX) F Z 0.1µF/50V or CA1J104TU014 Before replacing any of these components, read care- CERAMIC CAP.(AX) F Z 0.1µF/50V CCA1JZT0F104 fully the product safety notice in this service manual.
  • Page 42 Ref. No. Description Part No. Ref. No. Description Part No. C386 CERAMIC CAP.(AX) B K 0.047µF/50V CA1J473TU011 C578 FILM CAP.(P) 0.01µF/50V J or CMA1JJS00103 C387 CERAMIC CAP.(AX) B K 0.047µF/50V CA1J473TU011 FILM CAP.(P) 0.01µF/50V J CA1J103MS029 C391 CERAMIC CAP.(AX) F Z 0.1µF/50V or CA1J104TU014 C580# PP CAP.
  • Page 43 Ref. No. Description Part No. Ref. No. Description Part No. ELECTROLYTIC CAP. 1000µF/35V M CE1GMZADL102 CONNECTOR BASE, 5P RTB-1.5-5P J3RTC05JG001 C667 ELECTROLYTIC CAP. 1µF/50V M or CE1JMASTL1R0 CN691 CONNECTOR BASE, 2P TV-50P-02-V3 or J3TVC02TG002 ELECTROLYTIC CAP. 1µF/50V M or CE1JMASDL1R0 CONNECTOR BASE, 2P RTB-1.5-2P J3RTC02JG001 ELECTROLYTIC CAP.
  • Page 44 Ref. No. Description Part No. Ref. No. Description Part No. D593# ZENER DIODE MTZJT-7736B or QDTB00MTZJ36 D821 SWITCHING DIODE 1SS133(T-77) or QDTZ001SS133 ZENER DIODE DZ-36BSBT265 NDTB00DZ36BS SWITCHING DIODE 1N4148 NDTZ001N4148 D595 SWITCHING DIODE 1SS133(T-77) or QDTZ001SS133 D826 SWITCHING DIODE 1SS133(T-77) or QDTZ001SS133 SWITCHING DIODE 1N4148 NDTZ001N4148...
  • Page 45 Ref. No. Description Part No. Ref. No. Description Part No. TRANSISTOR 2SC2785(H) or QQSH02SC2785 Q831 TRANSISTOR 2SB892(S) or QQSS002SB892 TRANSISTOR 2SC2785(J) or QQSJ02SC2785 TRANSISTOR 2SB892(T) QQST002SB892 TRANSISTOR KTC3199(GR) or NQS10KTC3199 Q832# TRANSISTOR 2SC2785(F) or QQSF02SC2785 TRANSISTOR KTC3198(GR) or NQS40KTC3198 TRANSISTOR 2SC2785(H) or QQSH02SC2785 TRANSISTOR 2SC1815-GR(TPE2) QQS102SC1815...
  • Page 46 Ref. No. Description Part No. Ref. No. Description Part No. CARBON RES. 1/4W J 2.7k Ω CARBON RES. 1/4W J 220 Ω or R311 RCX4JATZ0272 R432 RCX4JATZ0221 CARBON RES. 1/4W J 100 Ω or CARBON RES. 1/6W J 220 Ω R314 RCX4JATZ0101 RCX6JATZ0221...
  • Page 47 Ref. No. Description Part No. Ref. No. Description Part No. CEMENT RESISTOR 5W J 1.2 Ω or CARBON RES. 1/2W J 100 Ω or RW051R2Y4001 R801 RCX2JZQZ0101 CEMENT RES. 3W K 1.2 Ω CARBON RES. 1/2W J 100 Ω RW031R2PG007 RCX2JZPZ0101 CARBON RES.
  • Page 48 CRT CBA Ref. No. Description Part No. BC101 BEAD INDUCTORS FBR07HA121TB-00 LLBF00ZTU021 Ref. No. Description Part No. BC102 BEAD INDUCTORS FBR07HA121TB-00 LLBF00ZTU021 CRT CBA ------------ BC571 BEAD INDUCTORS FBA04HA600VB-00 LLBF00STU026 Consists of the following BC601 BEAD INDUCTORS FBR07HA121TB-00 LLBF00ZTU021 CAPACITORS BC602 BEAD INDUCTORS FBR07HA121TB-00 LLBF00ZTU021...
  • Page 49 Ref. No. Description Part No. CLN501 PARALLEL WIRE 3P WX1L1114-101 JK501# CRT SOCKET ISMS02S JSCC220PK003 20020426 13-9 L6118EL...
  • Page 50 Printed in Japan 2002-05-24 HO...

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