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Sylvania 6620LE Service Manual

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SERVICE MANUAL
Model 6620LE has two versions, both
Rating label
"C"
"C" version and "non-C" version.
This manual applies to the "C" version
of the model 6620LE, called 6620LE C,
which is shown on the rating label at
right.
Model number
20" COLOR LCD TELEVISION
6620LE

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  • Page 1 Model 6620LE has two versions, both Rating label "C" "C" version and "non-C" version. This manual applies to the "C" version of the model 6620LE, called 6620LE C, which is shown on the rating label at right. Model number 20″ COLOR LCD TELEVISION...

  • 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 (LCD Green Cathode) Test Input Signal -------------- 400 Hz 30% modulation Description Condition Unit Nominal Limit Picture 45.75 1. Intermediate Freq. Sound 41.25 CH-2 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 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 6 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 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 Removal Step/ This flowchart indicates the disassembly steps for the Remove/*Unhook/ 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 13 (S-1) (S-1) (S-1) (S-1) (S-2) (S-1) (S-1) (S-1) (S-1) (S-1) [1] Rear Cabinet Fig. D1 [8] Function CBA [11] Front Cabinet (S-10) [10] Speaker (S-10) (S-12) [6] LCD Holder (S-9) (S-8) (S-8) (S-9) (S-8) [5] LCD Main CBA Unit [2] Jack Holder (S-9) (S-7) (S-3)
  • Page 14 TV Cable Wiring Diagram To Liquid Crystal Panel To Liquid Crystal Panel CN310A CN311A CN312A LCD Main CN102B CN103B CBA Unit CN51 CN53 CN101A CN102A CN103A CN481 CLN481 CN801 Main CBA CN802 To Liquid Crystal Panel To Speaker To Speaker CLN51B CLN53 Function CBA...

  • Page 15: 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 16 Button Button Data Data Item (on the service Item (on the service Value Value remote control) remote control) D2-BRT D2-CNT LANGUAGE SPA/FRA D2-CLR-R STEREO TYPE [MENU] → [5] D2-CLR-B ACCESS CODE D2-TNT BACK LIGHT [VOL p] D2-SHR D3-BRT 2DVP D3-CNT D3-CLR-R [MENU] →...
  • Page 17 4. Flicker Adjustment The following adjustment normally are not attempted in the field. Only when replacing the Adjustment Point: VR201 (LCD Main CBA Unit) LCD Panel then adjust as a preparation. LCD Main CBA Unit 5. White Balance Adjustment Purpose: To mix red, green and blue beams correctly VR201 for pure white.

  • Page 18: How To Initialize The Lcd Television

    HOW TO INITIALIZE THE LCD TELEVISION How to initialize the LCD television: 1. Turn the power on. (Use main power on the TV unit.) 2. To enter the service mode, press [POWER], [2], [7], [1], and [MUTE] buttons on the remote control unit in that order within 5 seconds.

  • Page 19: Block Diagrams

    BLOCK DIAGRAMS System Control Block Diagram L0306BLS...
  • Page 20 IF/Video Block Diagram L0306BLIF...
  • Page 21 Audio Block Diagram L0306BLA...
  • Page 22 LCD Block Diagram L0306BLLCD...
  • Page 23 Power Supply Block Diagram L0306BLP...
  • Page 24 LCD Backlight Block Diagram L0306BLLB...

  • Page 25: 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 26 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 27 Main 1/4 Schematic Diagram MAIN 1/4 Ref No. Position IC502 IC503 IC504 IC505 TRANSISTORS Q501 Q502 Q503 Q504 Q505 Q506 Q507 Q508 Q509 Q510 Q511 Q512 Q513 CONNECTORS CN51 CN52 CN53 CN101A CN102A L0306SCM1...
  • Page 28 Main 2/4 Schematic Diagram VIDEO SIGNAL AUDIO SIGNAL MAIN 2/4 Ref No. Position IC11 IC851 IC852 TRANSISTORS Q709 TEST POINT TP300 L0306SCM2...
  • Page 29 Main 3/4 Schematic Diagram VIDEO SIGNAL AUDIO SIGNAL MAIN 3/4 Ref No. Position IC781 IC801 TRANSISTORS Q701 Q702 Q703 Q704 Q705 Q706 Q707 Q708 Q802 Q803 CONNECTORS CN103A CN801 CN802 L0306SCM3...
  • Page 30 Main 4/4 Schematic Diagram CAUTION ! NOTE : CAUTION: FOR CONTINUED PROTECTION AGAINST RISK OF Fixed voltage (or Auto voltage selectable) power supply circuit is used in this unit. The voltage for parts in hot circuit is FIRE, REPLACE ONLY WITH SAME TYPE 4A, 125V FUSE. If Main Fuse (F601) is blown, check to see that all components in the power supply circuit measured using hot GND as a ATTENTION: UTILISER UN FUSIBLE DE RECHANGE DE MÊME...
  • Page 31 Inverter Schematic Diagram INVERTER Ref No. Position IC401 TRANSISTORS Q403 Q405 Q411 Q412 Q431 Q432 Q433 Q434 Q435 Q436 Q461 Q462 Q463 Q464 Q465 Q466 CONNECTORS CN430 CN440 CN450 CN460 CN470 CN480 CN481 L0306SCI...
  • Page 32 Function Schematic Diagram L0306SCF...
  • Page 33 IR Sensor Schematic Diagram L0306SCIR...
  • Page 34 LCD Main 1/3 Schematic Diagram VIDEO SIGNAL AUDIO SIGNAL LCD 1/3 Ref No. Position IC333 CONNECTORS CN102B CN310A CN311A L0306SCL1 8-10...
  • Page 35 LCD Main 2/3 Schematic Diagram VIDEO SIGNAL AUDIO SIGNAL LCD 2/3 Ref No. Position IC151 IC171 TRANSISTOR Q102 CONNECTORS CN103B CN105 L0306SCL2 8-11...
  • Page 36 LCD Main 3/3 Schematic Diagram LCD 3/3 Ref No. Position IC201 IC202 IC203 IC204 IC205 TRANSISTOR Q201 CONNECTORS CN101B CN312A L0306SCL3 8-12...
  • Page 37 Main CBA Top View CAUTION ! CAUTION: FOR CONTINUED PROTECTION AGAINST RISK OF BECAUSE A HOT CHASSIS GROUND IS PRESENT IN THE POWER Fixed voltage (or Auto voltage selectable) power supply circuit is used in this unit. FIRE, REPLACE ONLY WITH SAME TYPE 4A, 125V FUSE. SUPPLY CIRCUIT, AN ISOLATION TRANSFORMER MUST BE USED.
  • Page 38 Main CBA Bottom View CAUTION ! CAUTION: FOR CONTINUED PROTECTION AGAINST RISK OF BECAUSE A HOT CHASSIS GROUND IS PRESENT IN THE POWER Fixed voltage (or Auto voltage selectable) power supply circuit is used in this unit. FIRE, REPLACE ONLY WITH SAME TYPE 4A, 125V FUSE. SUPPLY CIRCUIT, AN ISOLATION TRANSFORMER MUST BE USED.
  • Page 39 IR Sensor CBA Top View Function CBA Top View BL0300F01013-2 BL0300F01013-3 IR Sensor CBA Bottom View Function CBA Bottom View BL0300F01013-2 BL0300F01013-3 8-15...
  • Page 40 Inverter CBA Top View INVERTER CBA Ref No. Position IC401 TRANSISTORS Q403 Q405 Q411 Q412 Q431 Q432 Q433 Q434 Q435 Q436 Q461 Q462 Q463 Q464 Q465 Q466 CONNECTORS CN430 CN440 CN450 CN460 Inverter CBA Bottom View CN470 CN480 CN481 BL0300F01021 8-16...

  • Page 41: Waveforms

    WAVEFORMS WF1 ~ WF12 = Waveforms to be observed at Waveform check points. (Shown in Schematic Diagram.) Input: NTSC Color Bar Signal (with 1kHz Audio Signal) 1DIV: 1.0V 10 s 1DIV: 1.0V 10 s 1DIV: 200mV 20 s Pin 5 of CN310A Pin 48 of CN310A Pin 19 of CN103A 1DIV: 1.0V 20ns...

  • Page 42: Wiring Diagram

    WIRING DIAGRAM 10-1 L0306WI...

  • Page 43: Exploded Views

    EXPLODED VIEWS Cabinet Function CBA CLN801 SP801 CLN311 CLN310 CLN312 CLN801 LCD Main CBA Unit SP801 LCD1 B17 B17 IR Sensor CBA Inverter CBA See Electrical Parts List Main CBA for parts with this mark. AC601 11-1 L0306CEX...

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