Sylvania SRT2227S Service Manual
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Sylvania SRT2227S Service Manual

Sylvania SRT2227S Service Manual

Sylvania srt2227s - 27" color television service manual
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SERVICE MANUAL

27" COLOR TELEVISION
SRT2227S

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Summary of Contents for Sylvania SRT2227S

  • Page 1: Service Manual

    SERVICE MANUAL 27" COLOR TELEVISION SRT2227S...

  • 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: 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 12 [3] Main CBA [1] Rear Cabinet Fig. 3 Fig. 1 Anode Cap [4] CRT [1] Rear Cabinet Fig. 4 Fig. 2 L6200DC...
  • Page 13 TV Cable Wiring Diagram SP802 SP801 DG691 DEGAUSSING COIL CLN802 CLN801 MAIN CBA CN801 CN802 WH301A CN691 FLYBACK TRANSFORMER TUNER T571 WH501A CN571 AC601 AC CORD FOCUS JK1501 SCREEN WH301B WH501B ANODE CN1501 Fig. 5 TO CRT GROUND L6200DC...

  • Page 14: Electrical Adjustment Instructions

    ELECTRICAL ADJUSTMENT INSTRUCTIONS 1. DC 120V Adjustment General Note: "CBA" is abbreviation for "Circuit Board Assem- Purpose: To obtain correct operation. bly". Symptom of Misadjustment: The picture is dark and NOTE: the unit does not operate correctly. Electrical adjustments are required after replacing circuit components and certain mechanical parts.
  • Page 15 3-1. Setting for 7F and FRENCH TINT (TNT) data Values 1. Press " MENU " button on the Service remote con- trol unit. Then select " TINT " (TNT) display. General 2. Press " CH o / p " buttons on the Service remote 1.

  • Page 16: Vco Adjustment

    5. VCO Adjustment 6. Turn the Power off and on again. (Main power but- ton on the TV unit.) Purpose: To operate VCO correctly. 7. Black Level Adjustment Symptom of Misadjustment: VCO does not work correctly and/or synchronization is faulty. Purpose: Set Black Level Symptom of Misadjustment: If black level is incor- Test Point...
  • Page 17 9. V. Size Adjustment 11. H. Position Adjustment Purpose: To obtain correct vertical width of screen image. Purpose: To obtain correct horizontal position of screen image. Symptom of Misadjustment: If V. Size is incorrect, verti- cal size of image on the screen may not be properly dis- Symptom of Misadjustment: If H.

  • Page 18: Pin Cushion Adjustment

    13. PIN Cushion Adjustment 14. Cut-off Adjustment Purpose: To obtain correct straight vertical line of Purpose: To adjust the beam current of R, G, B, and screen image. screen voltage. Symptom of Misadjustment: If H.Pin cushion is incor- Symptom of Misadjustment: White color may be rect, vertical line of image on the screen may not be reddish, greenish or bluish.

  • Page 19: White Balance Adjustment

    15. White Balance Adjustment Note: Confirm that Cut Off Adj. is correct after this adjustment, and attempt Cut Off Adj. if needed. Purpose: To mix red, green and blue beams correctly for pure white. 16. Sub-Brightness Adjustment Symptom of Misadjustment: White becomes bluish Purpose: To get proper brightness.

  • Page 20: Focus Adjustment

    17. Focus Adjustment The following 2 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 21: Convergence Adjustment

    19. 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 EXT.CLK CONTROL 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 JK704 CN802 A-IN(R) (REAR) SP-R 2 SP-GND 1 VOL. DEMOD A-IN(L) MUTE (REAR) IC333 VIDEO/AUDIO/CHROMA/DEFLECTION/IF...
  • Page 24 CRT/H.V. Block Diagram VIDEO SIGNAL IC551 V-DEFLECTION CONTROL MAIN CBA THERMAL WF12 DY551 D.Y. WF11 PROTECTION V-DRIVE DRIVE P-ON-L Q531 (SWITCHING) PULSE V.RAMP NF DRIVE Q551, Q552 CONTROL FROM/TO IF/VIDEO CN571 /SYSTEM CONTROL BLOCK DIAGRAM Q572 Q571 T572 Q561 VR561 VR562 H-DRIVE H.DRIVE...

  • Page 25: Power Supply Block Diagram

    Power Supply Block Diagram CAUTION NOTE : CAUTION ! FOR CONTINUED PROTECTION AGAINST FIRE HAZARD, The voltage for parts in hot circuit is measured using Switching 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 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 LILIST 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 L6200SCM1...
  • Page 29 Main 2/3 & CRT Schematic Diagram 1 NOTE: CAUTION CAUTION ! The Capacitor ( C643 ) is either type A or type B. 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. These two types are exchangeable and can be equally used REPLACE ONLY WITH THE SAME TYPE FUSE.
  • 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 L6200SCM3...
  • Page 31 CRT CBA Top View CRT CBA Bottom View CRT CBA Ref No. Position TRANSISTORS Q1512 Q1522 Q1532 TEST POINTS TP1501 TP1502 CONNECTORS CN1501 WH301B WH501B WF15 WF13 TP1502 TP1501 Q1512 Q1512 Q1532 Q1532 BLUE Collector Base Collector Base WF14 Q1522 Q1522 Collector Base...
  • Page 32 Main CBA Top View 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 33 Main CBA Bottom View 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 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 SP-L SPEAKER L-CH CN802 CLN802 SP-GND SP802 SP-R SPEAKER R-CH ANODE TU1 TUNER UNIT V1501 MAIN CBA BL6200F01011 CN691 CLN551 FOCUS CN1501 T571 SCREEN WH301B WH301A CLN301 BLUE BLUE GREEN GREEN WH501B WH501A CLN501 CRT CBA HEATER 1 HEATER...

  • 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 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) INT-MONI/...

  • Page 37: Exploded Views

    EXPLODED VIEWS Cabinet SHINWHA TAPE SGT-730 V501-1 (BLACK) Details for DY551 and surrounding parts SHINWHA TAPE SGT-730 DY551 (WHITE) V501-2 CLN551 Scotch Tape #880 CLN801 DY551 CRT CBA SP801 DG691 CLN802 V501 SP802 AC601 MAIN CBA 11-1 11-2 L6200CEX...
  • Page 38 Packing TAPE PACKING TAPE 11-3 L6200PEX...

  • 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. CRT A68KTB359X(PB) or TCRT190QS025 Before replacing any of these components, read care- CRT A68KTB259X2 or TCRT190QS021 fully the product safety notice in this service manual. CRT A68KTB259X(P) TCRT190QS023 Don't degrade the safety of the product through...

  • Page 40: Electrical Parts List

    ELECTRICAL PARTS LIST PRODUCT SAFETY NOTE: Products marked with a Ref. No. Description Part No. # have special characteristics important to safety. C164 FILM CAP.(P) 0.001µF/50V J or CMA1JJS00102 Before replacing any of these components, read care- FILM CAP.(P) 0.001µF/50V J CA1J102MS029 fully the product safety notice in this service manual.
  • Page 41 Ref. No. Description Part No. Ref. No. Description Part No. C375 PCB JUMPER D0.6-P5.0 JW5.0T ELECTROLYTIC CAP. 470µF/35V M CE1GMZNDL471 C381 CERAMIC CAP.(AX) F Z 0.1µF/50V or CA1J104TU014 C551# PCB JUMPER D0.6-P10.0 JW10.0T CERAMIC CAP.(AX) F Z 0.1µF/50V CCA1JZT0F104 C552# METALIZED PLYESTER CAP.
  • Page 42 Ref. No. Description Part No. Ref. No. Description Part No. If C642 is 0.01µF, then C643 is 0.01µF. C809 ELECTROLYTIC CAP. 10µF/50V M or CE1JMASTL100 C642# SAFETY CAP. 10000pF/250V or CCG2EMA0F103 ELECTROLYTIC CAP. 10µF/50V M CE1JMASDL100 SAFETY CAP. F M 0.01µF/250V or CCG2EMP0F103 C811 ELECTROLYTIC CAP.
  • Page 43 Ref. No. Description Part No. Ref. No. Description Part No. DIODE 1SS176TPA7 1SS176T D615# SWITCHING DIODE 1N4148 T-77 QDTZ001N4148 D316 SWITCHING DIODE 1SS133(T-77) or QDTZ001SS133 D621 ZENER DIODE MTZJT-777.5B QDTB0MTZJ7R5 SWITCHING DIODE 1N4148 or NDTZ001N4148 D622 SWITCHING DIODE 1SS133(T-77) or QDTZ001SS133 DIODE 1SS176TPA7 1SS176T...
  • Page 44 Ref. No. Description Part No. Ref. No. Description Part No. DIODE 1SS176TPA7 1SS176T Q351 TRANSISTOR 2SC2785(F) or QQSF02SC2785 D846# SWITCHING DIODE 1SS133(T-77) or QDTZ001SS133 TRANSISTOR 2SC2785(H) or QQSH02SC2785 SWITCHING DIODE 1N4148 or NDTZ001N4148 TRANSISTOR 2SC2785(J) or QQSJ02SC2785 DIODE 1SS176TPA7 1SS176T TRANSISTOR KTC3199(GR) or NQS10KTC3199 D847#...
  • Page 45 Ref. No. Description Part No. Ref. No. Description Part No. TRANSISTOR 2SC2785(J) or QQSJ02SC2785 TRANSISTOR KTC3198(GR) or NQS40KTC3198 TRANSISTOR KTC3199(GR) or NQS10KTC3199 TRANSISTOR 2SC3331(T)-AANP or 2SC3331TZ TRANSISTOR KTC3198(GR) or NQS40KTC3198 TRANSISTOR 2SC3331(U)-AANP or 2SC3331UZ TRANSISTOR 2SC3331(T)-AANP or 2SC3331TZ TRANSISTOR 2SC1815-GR(TPE2) QQS102SC1815 TRANSISTOR 2SC3331(U)-AANP or 2SC3331UZ...
  • Page 46 Ref. No. Description Part No. Ref. No. Description Part No. CARBON RES. 1/4W J 1k Ω or CARBON RES. 1/4W J 15k Ω or R305 RCX4JATZ0102 R374 RCX4JATZ0153 CARBON RES. 1/6W J 1k Ω CARBON RES. 1/6W J 15k Ω RCX6JATZ0102 RCX6JATZ0153 CARBON RES.
  • Page 47 Ref. No. Description Part No. Ref. No. Description Part No. CARBON RES. 1/6W J 470 Ω CARBON RES. 1/4W J 330 Ω or RCX6JATZ0471 R577 RCX4JATZ0331 CARBON RES. 1/4W J 56k Ω or CARBON RES. 1/6W J 330 Ω R537 RCX4JATZ0563 RCX6JATZ0331 CARBON RES.
  • Page 48 Ref. No. Description Part No. Ref. No. Description Part No. CARBON RES. 1/4W J 1.5k Ω or CARBON RES. 1/4W J 10 Ω or R621 RCX4JATZ0152 R687 RCX4JATZ0100 CARBON RES. 1/6W J 1.5k Ω CARBON RES. 1/6W J 10 Ω RCX6JATZ0152 RCX6JATZ0100 CARBON RES.
  • Page 49 Ref. No. Description Part No. Ref. No. Description Part No. CARBON RES. 1/4W J 1k Ω or R838 RCX4JATZ0102 FUSE HOLDER FH-V-03078 or XH01Z00DK001 CARBON RES. 1/6W J 1k Ω RCX6JATZ0102 HOLDER, FUSE CNT41-0014 1790424 METAL OXIDE FILM RES. 1W J 5.6 Ω or R841# RN015R6ZU001 FH602...
  • Page 50 CRT CBA Ref. No. Description Part No. R1530# FIXED METAL OXIDE FILM RES. 3W J 10k Ω or RN03103KE008 Ref. No. Description Part No. METAL RESISTOR 3W J 10k Ω or RN03103ZU001 CRT CBA ------------ METAL RES. 3W J 10k Ω or RN03103UB503 Consists of the followings FIXED METAL OXIDE FILM RES.
  • Page 51 Printed in Japan 2002-02-30 HO...

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