Sylvania 6637LCT Service Manual
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Sylvania 6637LCT Service Manual

37" color lcd television
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SERVICE MANUAL

37" COLOR LCD TELEVISION
6637LCT

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Summary of Contents for Sylvania 6637LCT

  • Page 1: Service Manual

    SERVICE MANUAL 37″ COLOR LCD TELEVISION 6637LCT...

  • 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 / NTSC > ANT. Input ---------------------- 75 ohm Unbal., F type Description Condition Unit Nominal Limit Picture 45.75 1. Intermediate Freq. Sound 41.25 CH-4 dBµV 2. Syncronizing Sens. CH-10 dBµV CH-41 dBµV 3. AFT Pull In Range (10 mV input) ±2.3 ±2.1 <...
  • Page 4 < AUDIO > All items are measured across 8 Ω load at speaker output terminal with L.P.F. Description Condition Unit Nominal Limit 1. Audio Output Power 10% THD: Lch/Rch 5.0/5.0 4.5/4.5 2. Audio Distortion 500mW: Lch/Rch 1.0/1.0 4.0/4.0 -6dB: Lch 100 to 10 k 3.

  • Page 5: 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 6 3. Design Alteration Warning - Do not alter or add 7. Product Safety Notice - Some electrical and to the mechanical or electrical design of this TV mechanical parts have special safety-related receiver. Design alterations and additions, characteristics which are often not evident from including, but not limited to circuit modifications visual inspection, nor can the protection they give and the addition of items such as auxiliary audio...
  • Page 7 Precautions during Servicing A. Parts identified by the # symbol are critical for L. When connecting or disconnecting the internal safety. connectors, first, disconnect the AC plug from the Replace only with part number specified. AC supply outlet. B. In addition to safety, other parts and assemblies M.
  • Page 8 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 9: 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 10 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 11 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 12 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 13: Cabinet Disassembly Instructions

    CABINET DISASSEMBLY INSTRUCTIONS 1. Disassembly Flowchart Removal Step/ Remove/*Unhook/ This flowchart indicates the disassembly steps for the Loc. Part Fig. Unlock/Release/ cabinet parts, and the CBA in order to gain access to Note Unplug/Unclamp/ item(s) to be serviced. When reassembling, follow the Desolder steps in reverse order.
  • Page 14 [5] Function CBA [4] Rear Cabinet [3] Stand Cover [2] Stand Hinge [1] Stand Base Plate Fig. D1 L5005DC...
  • Page 15 [9] Jack Holder(A) S-11 [7] Chassis Bracket S-12 [10] Shield Box S-12 [6] Stand Holder S-10 [8] Jack Holder(D) Fig. D2 S-16 [13] PCB Holder S-16 S-13 S-13 S-15 S-15 [11] Main CBA S-14 [12] Digital Main CBA Unit S-14 Fig.
  • Page 16 [21] Front Cabinet [14] Panel Holder UD S-17 S-18 [19] Speaker (R) S-17 S-18 [16] Inverter CBA S-17 S-20 S-23 S-21 [15] T-CON CBA S-22 Shield Plate S-21 [18] LED CBA S-17 S-24 S-21 [20] Speaker (L) S-19 [17] LCD Module Assembly S-21 S-18 S-17...
  • Page 17 TV Cable Wiring Diagram To LCD To LCD Module Assembly Module Assembly Inverter CBA CN1211 CN1210 CN1050 CN1150 CN1250 CN1350 CN1100 CN1200 CN1300 CN1400 CN1111 T-CON CBA CN1000 Digital Main CBA Unit Main CBA CN1121 CN1505 CN111 CN1111 CN253 CN1112 CN112 CN1116 CN113...

  • Page 18: 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 19: White Balance Adjustment

    1. Purity Check Mode The following adjustment normally are not attempted in the field. Only when replacing the This mode cycles through full-screen displays of red, LCD Panel then adjust as a preparation. green, blue, and white to check for non-active pixels. 2.

  • Page 20: Flicker Adjustment

    3. Auto Calibration 4. Flicker Adjustment Purpose: To bring the color adjustment of each *This adjustment is required when reparing T-CON component into standard alignment. CBA. 1. Enter the Service mode. (See page 5-1.) Symptom of Misadjustment: If this adjustment is incorrect, component signals do not reproduce the 2.

  • Page 21: How To Initialize The Lcd Television

    HOW TO INITIALIZE THE LCD TELEVISION How to initialize the LCD television: 1. To turn the power on, press [POWER] button on the normal remote control unit or the unit. 2. Use the service remote control unit. (Refer to “ELECTRICAL ADJUSTMENT INSTRUCTIONS” section.

  • Page 22: Block Diagrams

    BLOCK DIAGRAMS System Control Block Diagram L5007BLS...
  • Page 23 Video Block Diagram L5007BLV...
  • Page 24 Digital Signal Process Block Diagram L5007BLD...
  • Page 25 Audio Block Diagram L5007BLA...
  • Page 26 Inverter Block Diagram L5007BLINV...
  • Page 27 Power Supply Block Diagram L5007BLP...

  • 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 1/5 Schematic Diagram VOLTAGE CHART CN114 Pin No. Voltage CN112 Pin No. Voltage L5007SCM1...
  • Page 31 Main 2/5 Schematic Diagram VOLTAGE CHART CN113 Pin No. Voltage L5007SCM2...
  • Page 32 Main 3/5 Schematic Diagram VOLTAGE CHART CN111 Pin No. Voltage 32.2 11.5 L5007SCM3...
  • Page 33 Main 4/5 Schematic Diagram L5007SCM4...
  • Page 34 Main 5/5 Schematic Diagram CAUTION ! NOTE: Fixed voltage (or Auto voltage selectable) power supply circuit is used in this unit. CAUTION ! : For continued protection against risk of fire, 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 using replace only with same type 4 A, 125V fuse.
  • Page 35 Function Schematic Diagram VOLTAGE CHART CN101 Pin No. Voltage L5007SCF...
  • Page 36 LED Schematic Diagram L5007SCL...
  • Page 37 Inverter Schematic Diagram 8-10 L5007SCINV...
  • Page 38 Digital Main 1/8 Schematic Diagram L5007SCD1 8-11...
  • Page 39 Digital Main 2/8 Schematic Diagram L5007SCD2 8-12...
  • Page 40 Digital Main 3/8 Schematic Diagram 1 NOTE: The order of pins shown in this diagram is different from that of actual IC1504. IC1504 is divided into four and shown as IC1504 (1/4) ~ IC1504 (4/4) in this Digital Main Schematic Diagram Section. L5007SCD3 8-13...
  • Page 41 Digital Main 4/8 Schematic Diagram 1 NOTE: The order of pins shown in this diagram is different from that of actual IC1504. IC1504 is divided into four and shown as IC1504 (1/4) ~ IC1504 (4/4) in this Digital Main Schematic Diagram Section. L5007SCD4 8-14...
  • Page 42 Digital Main 5/8 Schematic Diagram 1 NOTE: The order of pins shown in this diagram is different from that of actual IC1504. IC1504 is divided into four and shown as IC1504 (1/4) ~ IC1504 (4/4) in this Digital Main Schematic Diagram Section. 8-15 L5007SCD5...
  • Page 43 Digital Main 6/8 Schematic Diagram L5007SCD6 8-16...
  • Page 44 Digital Main 7/8 Schematic Diagram 1 NOTE: The order of pins shown in this diagram is different from that of actual IC1504. IC1504 is divided into four and shown as IC1504 (1/4) ~ IC1504 (4/4) in this Digital Main Schematic Diagram Section. 8-17 L5007SCD7...
  • Page 45 Digital Main 8/8 Schematic Diagram 8-18 L5007SCD8...
  • Page 46 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 Also, in order to have the ability to increase the input...
  • Page 47 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 Also, in order to have the ability to increase the input...
  • Page 48 Function CBA Top View Function CBA Bottom View BL5000F01012-2 8-21...
  • Page 49 LED CBA Top View LED CBA Bottom View 8-22 BL5000F01012-3...
  • Page 50 Inverter CBA Top View 8-23 BL5000F01021...
  • Page 51 Inverter CBA Bottom View 8-24 BL5000F01021...

  • Page 52: Waveforms

    WAVEFORMS WF1 ~ WF7 = Waveforms to be observed at Waveform check points. (Shown in Schematic Diagram.) Input: NTSC Color Bar Signal (with 1kHz Audio Signal) Pin 2 of CN113 Pin 13 of CN114 CVBS 0.2V 20µs VIDEO-Pb 0.2V 20µs Pin 21 of CN114 Pin 14 of CN114 20µs...

  • Page 53: Wiring Diagram

    WIRING DIAGRAM 10-1 L5007WI...

  • Page 54: Exploded Views

    EXPLODED VIEWS Cabinet Function CBA Inverter CBA SP802 T-CON CBA CLN804 LED CBA AC601 CLN803 SP801 LCD Module Assembly Main CBA Digital Main CBA Unit See Electrical Parts List for parts with this mark. 11-1 L5005CEX...
  • Page 55 Packing Some Ref. Numbers are not in sequence. Packing Tape Tape Packing Tape Packing Tape Packing Tape Packing Tape Packing Tape Packing Tape Packing Tape PP BAND 11-2 L5003PEX...

  • Page 56: Mechanical Parts List

    XB0M451MS002 NOTE: Parts that are not assigned part numbers (---------) are not available. Ref. No. Description Part No. FRONT CABINET L5003UD 1EM021498 BRAND BADGE L T9000UA~SYLVANIA~ 0EM409016 CONTROL PLATE L4300UA 1EM321266 REAR CABINET L5001CB 1EM021439 DECORATION PLATE L5001CB 1EM021443 RATING LABEL L5007UH...

  • Page 57: Electrical Parts List

    ELECTRICAL PARTS LIST PRODUCT SAFETY NOTE: Products marked with a Ref. No. Description Part No. # have special characteristics important to safety. C452 ELECTROLYTIC CAP . 100µF/10V M CA1A101SP085 Before replacing any of these components, read C453 CHIP CERAMIC CAP .(1608) F Z 0.1µF/50V CHD1JZ30F104 carefully the product safety notice in this service C454...
  • Page 58 Ref. No. Description Part No. Ref. No. Description Part No. C609 CERAMIC CAP . R K 1000pF/2KV CCD3DKA0R102 C810 ELECTROLYTIC CAP . 10µF/50V M CA1J100SP085 C610 PCB JUMPER D0.6-P5.0 JW5.0T C811 ELECTROLYTIC CAP . 100µF/25V M CA1E101SP085 C611# SAFETY CAP . 2200pF/250V CCG2EMPYV222 C813 ELECTROLYTIC CAP 1µF/50V M...
  • Page 59 Ref. No. Description Part No. Ref. No. Description Part No. D606# DIODE 1ZC30(Q) QDLZ001ZC30Q Q632# TRANSISTOR 2SC2120-O(TE2 F T) QQS02SC2120F D607 SWITCHING DIODE 1SS133(T-77) QDTZ001SS133 Q701 TRANSISTOR KTC3199-GR-AT/P NQS4KTC3199P D632# ZENER DIODE MTZJT-7727B QDTB00MTZJ27 Q702 TRANSISTOR KTC3199-GR-AT/P NQS4KTC3199P D633 ZENER DIODE MTZJT-775.6B QDTB0MTZJ5R6 Q703 TRANSISTOR KTC3199-GR-AT/P...
  • Page 60 Ref. No. Description Part No. Ref. No. Description Part No. CHIP RES. 1/10W J 100k Ω CHIP RES. 1/10W J 47k Ω R477 RRXAJR5Z0104 R566 RRXAJR5Z0473 CHIP RES. 1/10W J 100k Ω CARBON RES. 1/4W J 1.5k Ω R478 RRXAJR5Z0104 R567 RCX4JATZ0152 CHIP RES.
  • Page 61 Ref. No. Description Part No. Ref. No. Description Part No. CHIP RES.(1608) 1/10W 0 Ω CHIP RES. 1/10W J 39k Ω R716 RRXAJR5Z0000 R784 RRXAJR5Z0393 CHIP RES. 1/10W J 33k Ω CHIP RES. 1/10W J 390 Ω R718 RRXAJR5Z0333 R785 RRXAJR5Z0391 CHIP RES.
  • Page 62 Ref. No. Description Part No. Ref. No. Description Part No. JK702 Y/C JACK(SW) YKF51-5563N JYEL080JC002 CN803 PH CONNECTOR SIDE 2P S2B-PH-K- J3PHC02JG030 S(LF)(SN) JK703 5PIN JACK MSP-226V40-03 NI FE JYRL050LY033 CN804 PH CONNECTOR SIDE 2P S2B-PH-K- J3PHC02JG030 JK704 5PIN JACK MSP-226V40-03 NI FE JYRL050LY033 S(LF)(SN) JS803...
  • Page 63 Ref. No. Description Part No. Ref. No. Description Part No. C1103 CHIP CERAMIC CAP .(1608) B K 0.1µF/50V CHD1JK30B104 C1415 CHIP CERAMIC CAP . B K 1500pF/50V CHD1JK30B152 C1104 CHIP CERAMIC CAP . CH J 220pF/50V CHD1JJ3CH221 C1416 CHIP CERAMIC CAP . B K 2200pF/50V CHD1JK30B222 C1105 CHIP CERAMIC CAP .
  • Page 64 Ref. No. Description Part No. Ref. No. Description Part No. D1164 SWITCHING DIODE 1SS133(T-77) QDTZ001SS133 D1165 SWITCHING DIODE 1SS133(T-77) QDTZ001SS133 IC1000 IC PWM CONTROLLER OZ9938GN-B-0-T2 NSZBA0TTMC03 D1166 SWITCHING DIODE 1SS133(T-77) QDTZ001SS133 IC1001 IC MOSFET DRIVER OZ9982GN NSZBA0TTMC02 D1167 SWITCHING DIODE 1SS133(T-77) QDTZ001SS133 IC1500 IC BA10324AF-E2...
  • Page 65 Ref. No. Description Part No. Ref. No. Description Part No. CHIP RES. 1/10W J 1M Ω CHIP RES. 1/10W J 33 Ω R1070 RRXAJR5Z0105 R1301 RRXAJR5Z0330 CHIP RES. 1/10W J 1k Ω CHIP RES. 1/10W J 33 Ω R1071 RRXAJR5Z0102 R1302 RRXAJR5Z0330 CHIP RES.
  • Page 66 Ref. No. Description Part No. CHIP RES. 1/10W F 9.1k Ω R1602 RRXAFR5H9101 CHIP RES. 1/10W F 1.0k Ω R1603 RRXAFR5H1001 CARBON RES. 1/4W J 10k Ω R1604 RCX4JATZ0103 CHIP RES. 1/10W J 10k Ω R1605 RRXAJR5Z0103 CHIP RES. 1/10W J 10k Ω R1606 RRXAJR5Z0103 CHIP RES.
  • Page 67 6637LCT L5007UH 2006-12-11...

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