Emerson EWL20S5 Service Manual
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Emerson EWL20S5 Service Manual

Emerson 20" color lcd television
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SERVICE MANUAL

Rating Label
This service manual is for the EWL20S5
different LCD Module Assembly model, which is
different from the previous EWL20S5 model.
For EWL20S5 different LCD Module Assembly
model, an "A" or the letter (L3222UC) is printed
on rating label on the back of the unit. Refer to
the rating label illustration at right.
"L3222UC"
Suffix "A"
20" COLOR LCD TELEVISION
EWL20S5

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Summary of Contents for Emerson EWL20S5

  • Page 1: Service Manual

    SERVICE MANUAL Rating Label This service manual is for the EWL20S5 different LCD Module Assembly model, which is different from the previous EWL20S5 model. For EWL20S5 different LCD Module Assembly model, an “A” or the letter (L3222UC) is printed on rating label on the back of the unit. Refer to the rating label illustration at right.

  • 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 [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 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 D2-SHR D3-BRT D3-CNT D3-CLR-R FLASH (Go and Off) [MENU] → [6] D3-CLR-B 4.

  • 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 L3222BLS...
  • Page 20 IF/Video Block Diagram L3222BLIF...
  • Page 21 Audio Block Diagram L3222BLA...
  • Page 22 LCD Block Diagram L3222BLLCD...
  • Page 23 Power Supply Block Diagram L3222BLP...
  • Page 24 LCD Backlight Block Diagram L3222BLIV...

  • 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 L3222SCM1...
  • Page 28 Main 2/4 Schematic Diagram MAIN 2/4 Ref No. Position IC31 IC851 IC852 TRANSISTOR CONNECTOR CN113 L3222SCM2...
  • 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 L3222SCM3...
  • Page 30 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 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 L3222SCI...
  • Page 32 Function Schematic Diagram L3222SCF...
  • Page 33 IR Sensor Schematic Diagram L3222SCIR...
  • Page 34 LCD Main 1/2 Schematic Diagram LCD MAIN 1/2 Ref No. Position IC333 TRANSISTOR Q301 CONNECTORS CN104 CN105 CN211 CN311 CN102B L3222SCL1 8-10...
  • Page 35 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 L3222SCL2 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 BL3100F01022-2 Function CBA Bottom View BL3100F01022-3 BL3100F01022-2 8-14...
  • Page 39 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 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 L3222WI...

  • Page 42: 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 43 Packing Some Ref. Numbers are not in sequence. Tape Tape Packing Tape Packing Tape Packing Tape 11-2 L3222PEX...

  • Page 44: 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 L0203UD~EMERSON~ 0EM409020 CONTROL PLATE L0301UB 1EM220019 REAR CABINET L3200UA 1EM020138 RATING LABEL L3222UC ----------...

  • 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. 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 46 Ref. No. Description Part No. Ref. No. Description Part No. C713 CHIP CERAMIC CAP .(1608) B K 3300pF/50V CHD1JK30B332 CN802 CONNECTOR BASE 008283021100000S+ J383C02UG003 C714 CHIP CERAMIC CAP . F Z 2.2µF/10V CHD1AZ30F225 DIODES C715 CHIP CERAMIC CAP .(1608) B K 3300pF/50V CHD1JK30B332 SWITCHING DIODE 1SS400 QD1Z001SS400...
  • Page 47 Ref. No. Description Part No. Ref. No. Description Part No. 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 CARBON RES. 1/4W J 12k Ω D703 ZENER DIODE MTZJT-778.2B QDTB0MTZJ8R2 RCX4JATZ0123...
  • Page 48 Ref. No. Description Part No. Ref. No. Description Part No. CHIP RES. 1/10W J 27k Ω CHIP RES. 1/10W J 10k Ω R642# RRXAJR5Z0273 R782 RRXAJR5Z0103 CARBON RES. 1/4W J 22k Ω CHIP RES. 1/10W J 10k Ω R645 RCX4JATZ0223 R784 RRXAJR5Z0103 CARBON RES.
  • Page 49 Ref. No. Description Part No. Ref. No. Description Part No. BC630 BEADS INDUCTOR FBR07HA121SB-00 LLBF00STU030 C416 CHIP CERAMIC CAP .(1608) B K 0.1µF/50V CHD1JK30B104 BC631 BEADS INDUCTOR FBR07HA121SB-00 LLBF00STU030 C420 ELECTROLYTIC CAP . 47µF/35V M CA1G470SP096 BC632 PCB JUMPER D0.6-P5.0 JW5.0T C422 CHIP CERAMIC CAP .(1608) B K 0.1µF/50V...
  • Page 50 Ref. No. Description Part No. Ref. No. Description Part No. CHIP RES. 1/10W J 10k Ω D455 SWITCHING DIODE 1SS400 QD1Z001SS400 R432 RRXAJR5Z0103 D456 SWITCHING DIODE 1SS400 QD1Z001SS400 R435 PCB JUMPER D0.6-P5.0 JW5.0T CHIP RES. 1/10W J 10k Ω D457 SWITCHING DIODE 1SS133(T-77) QDTZ001SS133 R437...
  • Page 51 Ref. No. Description Part No. 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. 1/10W J 47 Ω RRXAJR5Z0470 SWITCHES SW61 TACT SWITCH SKQSAB SST0101AL038 SW62 TACT SWITCH SKQSAB SST0101AL038 SW63...
  • Page 52 EWL20S5 L3222UC 2005-12-06...

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