Sylvania 6620LF4 Service Manual

20″ color lcd television

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Owner's manual (9 pages)

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SERVICE MANUAL

This service manual shows only the differences between

the model 6620LF4 and the original model EWL2005.

All other information is described in the service manual

of the model EWL2005.

20" COLOR LCD TELEVISION

Block Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Schematic Diagrams / CBA's and Test Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Different parts from the original model (EWL2005) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

6620LF4

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Summary of Contents for Sylvania 6620LF4

Page 1 SERVICE MANUAL This service manual shows only the differences between the model 6620LF4 and the original model EWL2005. All other information is described in the service manual of the model EWL2005. 20″ COLOR LCD TELEVISION 6620LF4 TABLE OF CONTENTS Block Diagrams ..............1-1 Schematic Diagrams / CBA’s and Test Points .
Page 2 BLOCK DIAGRAMS System Control Block Diagram L3200BLS...
Page 3 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 4 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 5 IR Sensor Schematic Diagram L3200SCIR...
Page 6 Function CBA Top View IR Sensor CBA Top & Bottom View BL3100F01021-2 Function CBA Bottom View BL3100F01021-3 BL3100F01021-2...
Page 7 Different parts from the original model (EWL2005) Ref. No. Description Part No. MECHANICAL PARTS FRONT CABINET L3200UA 1EM020185 BRAND BADGE L0200UA~SYLVANIA~ 0EM409019 CONTROL PLATE L0301UB 1EM220019 REAR CABINET L3200UA 1EM020138 Not Used RATING LABEL L3200UA ---------- FUNCTION KNOB L0301UB 1EM220005A...
Page 8 6620LF4 L3200UA 2005-06-10...
Page 9 SERVICE MANUAL Rating Label This service manual is for the 6620LF4 different LCD Module Assembly model, which is different from the previous 6620LF4 model. For 6620LF4 different LCD Module Assembly model, an “C” or the letter (L3220UA) is printed on rating label on the back of the unit. Refer to the rating label illustration at right.
Page 10: 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 11: 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 12: 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 13 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 14 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 15 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 16: 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 17 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 18 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 19 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 20: 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 21 [1] Rear Cabinet Fig. D1 [9] Front Cabinet [6] Function CBA [3] Inverter CBA S-10 [8] Speaker S-10 [8] Speaker S-10 [5] LCD Main CBA & [7] IR Sensor CBA Liquid Crystal Panel Unit [4] Main CBA [2] Jack Holder Fig.
Page 22 TV Cable Wiring Diagram To Liquid Crystal Panel 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 Panel To Speaker To Speaker Fig.
Page 23: 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 24 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 25 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 26: 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 27: Block Diagrams
BLOCK DIAGRAMS System Control Block Diagram L3220BLS...
Page 28 IF/Video Block Diagram L3220BLIF...
Page 29 Audio Block Diagram L3220BLA...
Page 30 LCD Block Diagram L3220BLLCD...
Page 31 Power Supply Block Diagram L3220BLP...
Page 32 LCD Backlight Block Diagram L3220BLIV...
Page 33: 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 34 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 35 Main 1/4 Schematic Diagram MAIN 1/4 Ref No. Position IC531 IC533 IC671 IC672 TRANSISTORS Q501 Q502 Q503 Q505 Q509 Q510 Q511 Q512 Q513 Q531 Q633 CONNECTORS CN411 CN101A CN102A TEST POINT TP401 L3220SCM1...
Page 36 Main 2/4 Schematic Diagram MAIN 2/4 Ref No. Position IC31 IC851 IC852 TRANSISTOR CONNECTOR CN113 L3220SCM2...
Page 37 Main 3/4 Schematic Diagram MAIN 3/4 Ref No. Position IC781 IC801 TRANSISTORS Q701 Q702 Q703 Q704 Q705 Q706 Q707 Q708 Q802 Q803 CONNECTORS CN801 CN802 CN103A L3220SCM3...
Page 38 Main 4/4 Schematic Diagram MAIN 4/4 Ref No. Position CAUTION ! NOTE: IC601 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, TRANSISTORS If Main Fuse (F601) is blown , check to see that all components in the power supply...
Page 39 Inverter Schematic Diagram INVERTER Ref No. Position IC401 IC402 TRANSISTORS Q403 Q411 Q412 Q421 Q426 Q433 Q451 Q452 Q454 Q455 Q461 Q462 Q491 Q492 CONNECTORS CLN411 CN450 CN460 CN490 L3220SCI...
Page 40 Function Schematic Diagram L3220SCF...
Page 41 IR Sensor Schematic Diagram L3220SCIR...
Page 42 LCD Main 1/2 Schematic Diagram LCD MAIN 1/2 Ref No. Position IC333 TRANSISTOR Q301 CONNECTORS CN104 CN105 CN211 CN311 CN102B L3220SCL1 8-10...
Page 43 LCD Main 2/2 Schematic Diagram LCD MAIN 2/2 Ref No. Position IC151 IC171 IC191 IC192 IC193 IC201 TRANSISTORS Q131 Q201 CONNECTORS CN112 CN312 CN101B CN103B L3220SCL2 8-11...
Page 44 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 45 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 46 Function CBA Top View IR Sensor CBA Top & Bottom View BL3100F01022-2 Function CBA Bottom View BL3100F01022-3 BL3100F01022-2 8-14...
Page 47 Inveretr CBA Top View INVERTER Ref No. Position IC401 IC402 TRANSISTORS Q403 Q411 Q412 Q421 Q426 Q433 Q451 Q452 Q454 Q455 Q461 Q462 Q491 Q492 CONNECTORS CLN411 CN450 CN460 CN490 Inverter CBA Bottom View 8-15 BL3100F01022-1...
Page 48: 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) 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 49: Wiring Diagram
WIRING DIAGRAM 10-1 L3220WI...
Page 50: Exploded Views
EXPLODED VIEWS Cabinet Function CBA CLN802 SP802 CLN801 SP801 Main CBA Inverter CBA IR Sensor CBA LCD Main CBA & Liquid Crystal Panel Unit See Electrical Parts List for parts with this mark. AC601 11-1 L3222CEX...
Page 51 Packing Some Ref. Numbers are not in sequence. Tape Tape Packing Tape Packing Tape Packing Tape 11-2 L3222PEX...
Page 52: Mechanical Parts List
NOTE: Parts that are not assigned part numbers (---------) are not available. Ref. No. Description Part No. FRONT CABINET L3200UA 1EM020185 BRAND BADGE L0200UA~SYLVANIA~ 0EM409019 CONTROL PLATE L0301UB 1EM220019 REAR CABINET L3200UA 1EM020138 RATING LABEL L3220UA ----------...
Page 53: Electrical Parts List
ELECTRICAL PARTS LIST PRODUCT SAFETY NOTE: Products marked with a Ref. No. Description Part No. # have special characteristics important to safety. C501 ELECTROLYTIC CAP . 22µF/ 50V M CA1J220SP085 Before replacing any of these components, read C502 CHIP CERAMIC CAP .(1608) B K 0.01µF/ 50V CHD1JK30B103 carefully the product safety notice in this service C503...
Page 54 Ref. No. Description Part No. Ref. No. Description Part No. C712 ELECTROLYTIC CAP . 47µF/ 16V M CA1C470SP085 CN102A TWG CONNECTOR 23P TWG-P23P-A1 J3TWA23TG001 C713 CHIP CERAMIC CAP .(1608) B K 3300pF/50V CHD1JK30B332 CN103A TWG CONNECTOR 23P TWG-P23P-A1 J3TWA23TG001 C714 CHIP CERAMIC CAP .
Page 55 Ref. No. Description Part No. Ref. No. Description Part No. CHIP RES. 1/10W J 2.2k Ω D682 SWITCHING DIODE 1SS133(T-77) QDTZ001SS133 RRXAJR5Z0222 CHIP RES. 1/10W J 820k Ω D701 ZENER DIODE MTZJT-778.2B QDTB0MTZJ8R2 RRXAJR5Z0824 CHIP RES.(1608) 1/10W 0 Ω D702 ZENER DIODE MTZJT-778.2B QDTB0MTZJ8R2 RRXAZR5Z0000...
Page 56 Ref. No. Description Part No. Ref. No. Description Part No. METAL OXIDE FILM RES. 2W J 1k Ω CHIP RES. 1/10W J 10k Ω R638 RN02102KE010 R759 RRXAJR5Z0103 CHIP RES. 1/10W J 27k Ω CHIP RES. 1/10W J 10k Ω R642# RRXAJR5Z0273 R782...
Page 57 Ref. No. Description Part No. Ref. No. Description Part No. BC602 BEADS INDUCTOR FBR07HA121SB-00 LLBF00STU030 C414 ELECTROLYTIC CAP . 2.2µF/ 50V M CA1J2R2SP085 BC630 BEADS INDUCTOR FBR07HA121SB-00 LLBF00STU030 C415 ELECTROLYTIC CAP . 2.2µF/ 50V M CA1J2R2SP085 BC631 BEADS INDUCTOR FBR07HA121SB-00 LLBF00STU030 C416 CHIP CERAMIC CAP .(1608) B K 0.1µF/ 50V...
Page 58 Ref. No. Description Part No. Ref. No. Description Part No. CHIP RES. 1/10W J 15k Ω D453 SWITCHING DIODE 1SS400 QD1Z001SS400 R427 RRXAJR5Z0153 CHIP RES.(1608) 1/10W 0 Ω D454 SWITCHING DIODE 1SS400 QD1Z001SS400 R430 RRXAZR5Z0000 CHIP RES. 1/10W J 10k Ω D455 SWITCHING DIODE 1SS400 QD1Z001SS400...
Page 59 Ref. No. Description Part No. CHIP RES. 1/10W J 2.2k Ω RRXAJR5Z0222 CHIP RES. 1/10W J 2.7k Ω RRXAJR5Z0272 CHIP RES. 1/10W J 4.7k Ω RRXAJR5Z0472 CHIP RES. 1/10W J 6.8k Ω RRXAJR5Z0682 CHIP RES. 1/10W J 10k Ω RRXAJR5Z0103 CHIP RES.
Page 60 6620LF4 L3220UA 2006-1-12...

Sylvania 6620LF4 Service Manual

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