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Emerson EWL2005 Service Manual

20" color lcd television
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SERVICE MANUAL

20" COLOR LCD TELEVISION
EWL2005

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Summary of Contents for Emerson EWL2005

  • Page 1: Service Manual

    SERVICE MANUAL 20″ COLOR LCD TELEVISION EWL2005...

  • 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 Fig. D1 [9] Front Cabinet [8] Speaker [3] Inverter CBA S-10 [6] Function CBA S-10 [8] Speaker [7] IR Sensor CBA [4] Main CBA [2] Jack Holder [5] LCD Main CBA & Liquid Crystal Panel Unit Fig. D2 L3202DC...
  • Page 14 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 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: 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 FLASH (Go and Off) D2-SHR D3-BRT D3-CNT 4. Press [CH o / p] buttons on the remote control D3-CLR-R unit so that flash stops.

  • Page 17: 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 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 L3202BLS...
  • Page 20 IF/Video Block Diagram L3202BLIF...
  • Page 21 Audio Block Diagram L3202BLA...
  • Page 22 LCD Block Diagram L3202BLLCD...
  • Page 23 Power Supply Block Diagram L3202BLP...
  • Page 24 LCD Backlight Block Diagram L3202BLIV...

  • 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 IC531 IC533 IC671 IC672 TRANSISTORS Q501 Q502 Q503 Q505 Q509 Q510 Q511 Q512 Q513 Q531 Q633 CONNECTORS CN411 CN101A CN102A TEST POINT TP401 L3202SCM1...
  • Page 28 Main 2/4 Schematic Diagram MAIN 2/4 Ref No. Position IC31 IC851 IC852 TRANSISTOR CONNECTOR CN113 L3202SCM2...
  • Page 29 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 L3202SCM3...
  • Page 30 Main 4/4 Schematic Diagram NOTE: CAUTION ! 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 31 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 L3202SCI...
  • Page 32 Function Schematic Diagram L3202SCF...
  • Page 33 IR Sensor Schematic Diagram L3202SCIR...
  • Page 34 LCD Main 1/2 Schematic Diagram LCD MAIN 1/2 Ref No. Position TRANSISTOR IC333 TRANSISTOR Q301 CONNECTORS CN104 CN105 CN111 CN211 CN311 CN102B L3202SCL1 8-10...
  • Page 35 LCD Main 2/2 Schematic Diagram LCD MAIN 2/2 Ref No. Position TRANSISTOR IC151 IC171 IC191 IC192 IC193 IC201 TRANSISTOR Q131 Q201 CONNECTORS CN112 CN312 CN101B CN103B L3202SCL2 8-11...
  • Page 36 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 37 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 38 Function CBA Top View IR Sensor CBA Top & Bottom View BL3100F01021-2 BL3100F01011-3 Function CBA Bottom View BL3100F01021-2 8-14...
  • Page 39 Inveretr CBA Top View Inverter CBA Bottom View 8-15 BL3100F01021-1...

  • Page 40: 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 41: Wiring Diagram

    WIRING DIAGRAM 10-1 L3202WI...

  • Page 42: Exploded Views

    EXPLODED VIEWS Cabinet CLN802 SP802 Inverter CBA Main CBA CLN801 Function CBA IR Sensor CBA SP801 LCD Main CBA & Liquid Crystal Panel Unit AC601 See Electrical Parts List for parts with this mark. 11-1 L3202CEX...
  • Page 43 Packing Some Ref. Numbers are not in sequence. Tape Tape Packing Tape Packing Tape Packing Tape 11-2 L3202PEX...

  • Page 44: Mechanical Parts List

    NOTE: Parts that are not assigned part numbers (---------) are not available. Ref. No. Description Part No. FRONT CABINET L3201UB 1EM020141 BRAND BADGE L T9004UE~EMERSON~ 0EM409017 CONTROL PLATE L3201UB 1EM220087 REAR CABINET L3201UB 1EM020142 RUUBBER FOOT L3201UB 1EM320183...

  • Page 45: Electrical Parts List

    ELECTRICAL PARTS LIST PRODUCT SAFETY NOTE: Products marked with a Ref. No. Description Part No. # have special characteristics important to safety. ELECTROLYTIC CAP . 4.7µF/50V M H7 CE1JMASSL4R7 Before replacing any of these components, read CHIP CERAMIC CAP .(1608) B K 0.01µF/50V CHD1JK30B103 carefully the product safety notice in this service CHIP CERAMIC CAP .(1608) B K 0.01µF/50V...
  • Page 46 Ref. No. Description Part No. Ref. No. Description Part No. C704 ELECTROLYTIC CAP . 47µF/16V M H7 CE1CMASSL470 CONNECTORS C705 CHIP CERAMIC CAP .(1608) B K 0.01µF/50V CHD1JK30B103 CN113 PH CONNECTOR (WHITE) TOP 4P B4B-PH-K- J3PHC04JG017 S(LF) C706 CHIP CERAMIC CAP .(1608) CH J 1000pF/50V CHD1JJ3CH102 CN411 PH CONNECTOR, TOP 11P B11B-PH-K-S(LF)
  • Page 47 Ref. No. Description Part No. Ref. No. Description Part No. D653 SWITCHING DIODE 1SS400 QD1Z001SS400 Q803 TRANSISTOR 2SA1175(F) QQSF02SA1175 D655# SCHOTTKY BARRIER DIODE YG861S12RSC QDQZYG861S12 RESISTORS CHIP RES.(1608) 1/10W J 100 Ω D658 PCB JUMPER D0.6-P5.0 JW5.0T RRXAJR5Z0101 CHIP RES.(1608) 1/10W J 100 Ω D659 PCB JUMPER D0.6-P5.0 JW5.0T...
  • Page 48 Ref. No. Description Part No. Ref. No. Description Part No. CHIP RES.(1608) 1/10W J 33k Ω R622 PCB JUMPER D0.6-P5.0 JW5.0T R748 RRXAJR5Z0333 CARBON RES. 1/4W J 2.2k Ω CHIP RES.(1608) 1/10W J 39k Ω R623 RCX4JATZ0222 R749 RRXAJR5Z0393 CHIP RES.(1608) 1/10W J 27k Ω CHIP RES.(1608) 1/10W J 18k Ω...
  • Page 49 ANALOG INVERTER CBA Ref. No. Description Part No. MISCELLANEOUS ASSEMBLY AC601# AC CORD PB8K9F4110AB057 WAC0172LW020 POW HEAT SINK PKG ASSEMBLY L3201UB 1EM420650 Ref. No. Description Part No. SHIELD BOX TOP L3201UB 1EM320159 ANALOG INVERTER CBA ASSEMBLY 1ESA10623 Consists of the following: HEAT SINK PKH ASSEMBLY L3201UB 1EM420648 INVERTER CBA...
  • Page 50 Ref. No. Description Part No. Ref. No. Description Part No. C1404 CHIP CERAMIC CAP .(1608) B K 0.22µF/25V CHD1EK30B224 Q491 TRANSISTOR 2SC4081 T106 Q QQ1Q02SC4081 C1409 CHIP CERAMIC CAP .(1608) B K 0.22µF/25V CHD1EK30B224 Q492 TRANSISTOR 2SC4081 T106 Q QQ1Q02SC4081 CONNECTORS RESISTORS CHIP RES.(1608) 1/10W J 10k Ω...
  • Page 51 Ref. No. Description Part No. CHIP RES.(1608) 1/10W J 10k Ω R488 RRXAJR5Z0103 CHIP RES.(100PPM) 1/10W F 620 Ω R490 RRXAFR5H6200 CHIP RES.(1608) 1/10W F 15 Ω R491 RRXAFR5H15R0 CHIP RES.(1608) 1/10W F 47.0 Ω R492 RRXAFR5H47R0 CHIP RES. 1/10W F 270 Ω R493 RRXAFR5H2700 CHIP RES.(1608) 1/10W J 1 Ω...
  • Page 52 EWL2005 L3202UC 2005-04-06...

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