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Sylvania 6620LCT A Service Manual

20" color lcd television
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SERVICE MANUAL

This service manual is for the 6620LCT and
Rating Label (Example: 6620LCT)
6620LG version A models, which are different
from the 6620LCT and 6620LG non-A version
models.
For 6620LCT and 6620LG version A models, a
suffix "A" is printed on the rating label on the
back of the unit. Refer to the rating label
Suffix "A"
illustration at right.
20" COLOR LCD TELEVISION
6620LCT/6620LG

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Summary of Contents for Sylvania 6620LCT A

  • Page 1: Service Manual

    SERVICE MANUAL This service manual is for the 6620LCT and Rating Label (Example: 6620LCT) 6620LG version A models, which are different from the 6620LCT and 6620LG non-A version models. For 6620LCT and 6620LG version A models, a suffix “A” is printed on the rating label on the back of the unit.

  • 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 [1] Rear Cabinet [2] Tilt Stand Assembly Fig. D1 [10] Front Cabinet [7] Function CBA S-10 Speaker [4] Inverter CBA Holders S-12 [9] Speaker S-11 [8] IR Sensor CBA S-12 Speaker Holders [9] Speaker [6] LCD Main CBA Unit & Liquid Crystal Panel Unit [5] Main CBA [3] Jack Holder...
  • Page 14 [11] Stand Cover [12] Arm Holder S-14 [13] Sheet R [14] Arm Assembly S-13 [13] Sheet L S-13 Fig. D3 L3219DC...
  • Page 15 TV Cable Wiring Diagram To Liquid Crystal Panel Unit Function CBA CLN104 LCD Main CBA Unit CN104 IR Sensor CBA CN311 CN312 CLN105 CN105 CN111 CN102B CN103B CN112 CN101B Main CBA CN113 CN103A CN102A CN101A CN801 CN802 To Liquid Crystal To Speaker To Speaker Panel Unit...

  • Page 16: 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 17: Clr-R

    3. If Flicker Adjustment is not fit, the screen become Button Data the following. Item (on the service Value remote control) D2-BRT VCOM D2-CNT D2-CLR-R [MENU] → [5] D2-CLR-B D2-TNT D2-SHR D3-BRT D3-CNT D3-CLR-R FLASH (Go and Off) [MENU] → [6] D3-CLR-B 4.

  • Page 18: White Balance Adjustment

    The following adjustment normally are not 5. [RF/VIDEO1] attempted in the field. Only when replacing the When “x” value and “y” value are not within LCD Panel then adjust as a preparation. specification, adjust “DB (C/D1)” or “DR (C/D1)”. Refer to “1. Initial Setting.” 3.

  • Page 19: 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 20: Block Diagrams

    BLOCK DIAGRAMS System Control Block Diagram L3219BLS...
  • Page 21 IF/Video Block Diagram L3219BLIF...
  • Page 22 Audio Block Diagram L3219BLA...
  • Page 23 LCD Block Diagram L3219BLLCD...
  • Page 24 Power Supply Block Diagram L3219BLP...
  • Page 25 LCD Backlight Block Diagram L3219BLIV...

  • Page 26: 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 27 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 28 Main 1/4 Schematic Diagram L3219SCM1...
  • Page 29 Main 2/4 Schematic Diagram L3219SCM2...
  • Page 30 Main 3/4 Schematic Diagram L3219SCM3...
  • Page 31 Main 4/4 Schematic Diagram CAUTION ! NOTE: Fixed voltage (or Auto voltage selectable) power supply circuit is used in this unit. The voltage for parts in hot circuit is measured using CAUTION ! : For continued protection against risk of fire, If Main Fuse (F601) is blown , check to see that all components in the power supply hot GND as a common terminal.
  • Page 32 Inverter Schematic Diagram L3219SCI...
  • Page 33 Function Schematic Diagram L3219SCF...
  • Page 34 IR Sensor Schematic Diagram L3219SCIR...
  • Page 35 LCD Main 1/2 Schematic Diagram L3219SCL1 8-10...
  • Page 36 LCD Main 2/2 Schematic Diagram L3219SCL2 8-11...
  • Page 37 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 38 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 39 Function CBA Top View IR Sensor CBA Top & Bottom View BL3100F01013-2 BL3100F01013-3 Function CBA Bottom View BL3100F01013-2 8-14...
  • Page 40 Inverter CBA Top View Inverter CBA Bottom View 8-15 BL3100F01022-1...

  • Page 41: S-Tnt

    WAVEFORMS WF1 ~ WF12 = Waveforms to be observed at Waveform check points. (Shown in Schematic Diagram.) Input: NTSC Color Bar Signal (with 1kHz Audio Signal) CLKH STH1 S-VIDEO-C 1DIV: 1.0V 10 s 1DIV: 1.0V 10 s 1DIV: 200mV 20 s R392 R394 Pin 7 of CN103A...

  • Page 42: Wiring Diagram

    WIRING DIAGRAM 10-1 L3219WI...

  • Page 43: Exploded Views

    EXPLODED VIEWS Cabinet Function CBA SP802 CLN802 Inverter CBA A9-1 Main CBA CLN801 IR Sensor CBA SP801 A9-4 A9-4 A9-2 A9-5 A9-6 LCD Main CBA Unit & Liquid Crystal Panel Unit A9-3 AC601 A9-5 A9-7 A9-4 See Electrical Parts List A9-5 for parts with this mark.
  • Page 44 Packing Some Ref. Numbers are not in sequence. Tape Tape Tape Packing Tape Packing Tape 11-2 L3219PEX...

  • Page 45: Mechanical Parts List

    1EM423214 STYROFOAM TOP L2600UA 1EM121396 Comparison Chart of Models and Marks STYROFOAM BOTTOM L2600UA 1EM121397 Model Mark SET BAG L0301UB 1EM320014A 6620LCT SERIAL NO. LABEL L9750UA ---------- 6620LG ACCESSORIES BAG POLYETHYLENE 235X365XT0.03 0EM408420A OWNERS MANUAL L3219UK 1EMN21591 Ref. No. Mark Description Part No.

  • Page 46: Electrical Parts List

    ELECTRICAL PARTS LIST PRODUCT SAFETY NOTE: Products marked with a Ref. No. Description Part No. # have special characteristics important to safety. CHIP CERAMIC CAP .(1608) CH J 47pF/50V CHD1JJ3CH470 Before replacing any of these components, read ELECTROLYTIC CAP . 1µF/50V M H7 CE1JMASSM1R0 carefully the product safety notice in this service CHIP CERAMIC CAP .(1608) CH J 47pF/50V...
  • Page 47 Ref. No. Description Part No. Ref. No. Description Part No. C672 CHIP CERAMIC CAP .(1608) B K 0.01µF/50V CHD1JK30B103 C865 CHIP CERAMIC CAP .(1608) B K 0.1µF/50V CHD1JK30B104 C673 ELECTROLYTIC CAP . 470µF/10V M CA1A471SP085 C866 CHIP CERAMIC CAP . F Z 2.2µF/10V CHD1AZ30F225 C674 CHIP CERAMIC CAP .(1608) B K 0.01µF/50V...
  • Page 48 Ref. No. Description Part No. Ref. No. Description Part No. D647# ZENER DIODE MTZJT-7739B QDTB00MTZJ39 Q704 TRANSISTOR 2SC2785(F) QQSF02SC2785 D648# SWITCHING DIODE 1SS400 QD1Z001SS400 Q705 TRANSISTOR 2SC4081 T106 Q QQ1Q02SC4081 D649# IC SHUNT REGULATOR KIA431-AT/P NSZBA0TJY036 Q706 TRANSISTOR 2SC2785(F) QQSF02SC2785 D650 SWITCHING DIODE 1SS400 QD1Z001SS400...
  • Page 49 Ref. No. Description Part No. Ref. No. Description Part No. CARBON RES. 1/4W J 220 Ω CHIP RES. 1/10W J 100 Ω R607 RCX4JATZ0221 R739 RRXAJR5Z0101 CARBON RES. 1/4W J 220 Ω CHIP RES. 1/10W J 390 Ω R608 RCX4JATZ0221 R740 RRXAJR5Z0391 CARBON RES.
  • Page 50 FUNCTION CBA Ref. No. Description Part No. CHIP RES. 1/10W J 22k Ω R842 RRXAJR5Z0223 Ref. No. Description Part No. CHIP RES. 1/10W J 22k Ω R843 RRXAJR5Z0223 FUNCTION CBA ---------- CHIP RES. 1/10W J 2.2k Ω R844 RRXAJR5Z0222 Consists of the following: CHIP RES.
  • Page 51 Ref. No. Description Part No. Ref. No. Description Part No. C440 CHIP CERAMIC CAP .(1608) B K 0.22µF/25V CHD1EK30B224 D492 SWITCHING DIODE 1SS400 QD1Z001SS400 C441 CHIP CERAMIC CAP .(1608) B K 0.22µF/25V CHD1EK30B224 D493 SWITCHING DIODE 1SS133(T-77) QDTZ001SS133 C442 CHIP CERAMIC CAP .(1608) B K 0.22µF/25V CHD1EK30B224 D494 SWITCHING DIODE 1SS133(T-77)
  • Page 52 Ref. No. Description Part No. CHIP RES. 1/10W J 680k Ω R457 RRXAJR5Z0684 CARBON RES. 1/4W J 10k Ω R458 RCX4JATZ0103 CHIP RES. 1/10W J 10k Ω R459 RRXAJR5Z0103 CHIP RES. 1/10W F 620 Ω R460 RRXAFR5H6200 CHIP RES.(1608) 1/10W F 15 Ω R461 RRXAFR5H15R0 CHIP RES.
  • Page 53 Misuse of any trademarks or any other content in this manual is strictly prohibited. Funai shall aggressively enforce its intellectual property rights to the fullest extent of the law. 6620LCT/6620LG L3219UK/L3223UD 2006-04-07...

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