Emerson EWL20S5 Service Manual
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Emerson EWL20S5 Service Manual

20″ color lcd television
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SERVICE MANUAL

Rating Label
This service manual is for the EWL20S5 version
B model, which is different from the original
LCD COLOR TV
EWL20S5 and the EWL20S5 version A model.
For EWL20S5 version B model, a suffix "B" is
printed on the rating label on the back of the
unit. Refer to the rating label illustration at right.
Suffix "B"
20" COLOR LCD TELEVISION
EWL20S5
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Summary of Contents for Emerson EWL20S5

  • Page 1: Service Manual

    B model, which is different from the original LCD COLOR TV EWL20S5 and the EWL20S5 version A model. For EWL20S5 version B model, a suffix “B” is printed on the 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

    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 [8] Speaker S-11 [3] Inverter CBA Speaker Holders [8] Speaker [4] Main S-11 Speaker Holders [5] LCD Module S-10 [7] IR Sensor CBA [2] Jack Holder Fig. D2 L2601DC...
  • Page 14 TV Cable Wiring Diagram Function CBA CLN104 To LCD Module Main CBA Inverter CBA CN1205 CN1206 CN1207 CN1201 CN301 CN404 CN304 To LCD CN302 Module CN303 CN310 CN801 CN1202 IR Sensor CBA CLN105 To Speaker To Speaker Fig. D3 L2601DC...

  • 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 [SLEEP] button on the service remote control unit. - To cancel the service mode, press [POWER] button on the remote control.

  • Page 19: Block Diagrams

    BLOCK DIAGRAMS System Control Block Diagram L2601BLS...
  • Page 20 IF/Video Block Diagram L2601BLIF...
  • Page 21 Audio Block Diagram L2601BLA...
  • Page 22 LCD Block Diagram L2601BLLCD...
  • Page 23 Power Supply Block Diagram L2601BLP...
  • Page 24 LCD Backlight Block Diagram L2601BLLB...

  • 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 1/5 Schematic Diagram L2601SCM1...
  • Page 28 Main 2/5 Schematic Diagram L2601SCM2...
  • Page 29 Main 3/5 Schematic Diagram L2601SCM3...
  • Page 30 Main 4/5 Schematic Diagram L2601SCM4...
  • Page 31 Main 5/5 Schematic Diagram CAUTION ! NOTE: Fixed voltage (or Auto voltage selectable) power supply circuit is used in this unit. CAUTION ! : For continued protection against risk of fire, If Main Fuse (F601) is blown , check to see that all components in the power supply The voltage for parts in hot circuit is measured using replace only with same type 4 A, 125V fuse.
  • Page 32 Function Schematic Diagram L2601SCF...
  • Page 33 IR Sensor Schematic Diagram L2601SCIR...
  • Page 34 Inverter Schematic Diagram L2601SCI 8-10...
  • Page 35 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 36 Main CBA Bottom View CAUTION ! Fixed voltage (or Auto voltage selectable) power supply circuit is used in this unit. CAUTION ! : For continued protection against risk of fire, If Main Fuse (F601) is blown , check to see that all components in the power supply replace only with same type 4 A, 125V fuse.
  • Page 37 Function CBA Top View IR Sensor CBA IR Sensor CBA Top View Bottom View Function CBA Bottom View BL2601F01031-2 BL2601F01031-1 8-13...
  • Page 38 Inverter CBA Top View Inverter CBA Bottom View 8-14 BL2500F01021...

  • Page 39: 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 Pin 2 of CN1206 Pin 26 of CN1206 Pin 52 of IC1202...

  • Page 40: Wiring Diagram

    WIRING DIAGRAM 10-1 L2601WI...

  • Page 41: Exploded Views

    EXPLODED VIEWS Cabinet Function CBA SP802 CLN802 CLN320 SP801 CLN801 CL1206 CL1207 CL1205 Inverter CBA IR Sensor CBA LCD1 See Electrical Parts List for parts with this mark. AC601 Main CBA 11-1 L2601CEX...
  • Page 42 Packing Some Ref. Numbers are not in sequence. Packing Tape Tape Packing Tape Packing Tape Packing Tape 11-2 L2601PEX...

  • Page 43: Mechanical Parts List

    MECHANICAL PARTS LIST PRODUCT SAFETY NOTE: Products marked with a # have special characteristics important to safety. Before replacing any of these components, read carefully the product safety notice in this service manual. Don't degrade the safety of the product through improper servicing.

  • Page 44: Electrical Parts List

    ELECTRICAL PARTS LIST PRODUCT SAFETY NOTE: Products marked with a Ref. No. Description Part No. # have special characteristics important to safety. C612 FILM CAP .(P) 0.01µF/50V J CMA1JJS00103 Before replacing any of these components, read C613 FILM CAP .(P) 0.056µF/50V J CMA1JJS00563 carefully the product safety notice in this service C631#...
  • Page 45 Ref. No. Description Part No. Ref. No. Description Part No. C819 CHIP CERAMIC CAP . B K 2200pF/50V CHD1JK30B222 C1256 CHIP CERAMIC CAP .(1608) B K 0.22µF/16V CHD1CK30B224 C820 CHIP CERAMIC CAP . B K 2200pF/50V CHD1JK30B222 C1257 CHIP CERAMIC CAP .(1608) B K 0.22µF/16V CHD1CK30B224 C853 ELECTROLYTIC CAP .
  • Page 46 Ref. No. Description Part No. Ref. No. Description Part No. D624# ZENER DIODE MTZJT-7733B QDTB00MTZJ33 IC1211 IC RESET BU4223G-TR 5PIN QSZBA0TRM103 D631# SCHOTTKY BARRIER DIODE ERC84-009 QDLZERC84009 COILS D632# DIODE FR154 NDLZ000FR154 INDUCTOR 22µH-K-5FT LLARKBSTU220 D633# DIODE FR154 NDLZ000FR154 INDUCTOR 22µH-K-5FT LLARKBSTU220 D634# SCHOTTKY BARRIEA DIODE 11EQS04...
  • Page 47 Ref. No. Description Part No. Ref. No. Description Part No. CARBON RES. 1/4W J 680 Ω CARBON RES. 1/4W J 2.2 Ω R414 RCX4JATZ0681 R663 RCX4JATZ02R2 CARBON RES. 1/4W J 33 Ω CARBON RES. 1/4W J 2.2 Ω R415 RCX4JATZ0330 R664 RCX4JATZ02R2 CARBON RES.
  • Page 48 Ref. No. Description Part No. Ref. No. Description Part No. CARBON RES. 1/4W J 22k Ω CHIP RES. 1/10W J 75 Ω R822 RCX4JATZ0223 R1279 RRXAJR5Z0750 CHIP RES. 1/10W J 22k Ω CHIP RES.(1608) 1/10W 0 Ω R823 RRXAJR5Z0223 R1301 RRXAZR5Z0000 CHIP RES.
  • Page 49 Ref. No. Description Part No. Ref. No. Description Part No. CHIP RES. 1/10W J 10k Ω R1363 RRXAJR5Z0103 C331 ELECTROLYTIC CAP . 22µF/50V M CE1JMASDL220 CHIP RES. 1/10W J 10k Ω R1364 RRXAJR5Z0103 C332 CHIP CERAMIC CAP .(1608) B K 0.01µF/50V CHD1JK30B103 CHIP RES.(1608) 1/10W 0 Ω...
  • Page 50 Ref. No. Description Part No. Ref. No. Description Part No. CHIP RES. 1/10W J 10k Ω D361 SWITCHING DIODE 1SS133(T-77) QDTZ001SS133 R344 RRXAJR5Z0103 CHIP RES. 1/10W J 1k Ω D362 SWITCHING DIODE 1SS133(T-77) QDTZ001SS133 R345 RRXAJR5Z0102 CHIP RES. 1/10W J 10k Ω D363 SWITCHING DIODE 1SS133(T-77) QDTZ001SS133...
  • Page 51 Ref. No. Description Part No. SW62 TACT SWITCH SKQSAB SST0101AL038 SW63 TACT SWITCH SKQSAB SST0101AL038 SW64 TACT SWITCH SKQSAB SST0101AL038 SW65 TACT SWITCH SKQSAB SST0101AL038 SW67 TACT SWITCH SKQSAB SST0101AL038 SW71 TACT SWITCH SKQSAB SST0101AL038 MISCELLANEOUS CLN104 WIRE ASSEMBLY SW 4PIN 230MM AWG26 WX1L2601-001 JS62 PCB JUMPER D0.6-P5.0...
  • Page 52 EWL20S5 L2601UB 2006-05-29...
  • Page 53 Refer to the Rating Label on the back of the unit to make sure model types. This service manual is for the EWL20S5 C version model, and shows only the differences between the EWL20S5 C version model and EWL20S5 B version model.
  • Page 54 Different parts from the B version model (EWL20S5) Ref. No. Description Part No. MECHANICAL PARTS RATING LABEL L2621UB ---------- LCD1 LCD MODULE ASSEMBLY UE200XB 1FSA10155 CARTON L2601UB 1EM423468A OWNER S MANUAL L2601UB 1EMN21873A ELECTRICAL PARTS MMA CBA 1ESA13457 MAIN CBA...

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