Emerson EWT19B4 Schematic

Page 1

SERVICE MANUAL

This service manual supplement (EWT19B4) contains only the difference from the original model. For all other data, see the original service manual for

ST419D.

19" COLOR TELEVISION

EWT19B4

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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.

It is important to note that this service manual contains various CAUTIONS and NOTICES which should be carefully read in order to minimize the risk of personal injury to service personnel. The possibility exists that improper service methods may damage the equipment. It also is important to understand that these CAUTIONS and NOTICES ARE NOT EXHAUSTIVE. Funai could not possibly know, evaluate and advice the service trade of all conceivable ways in which service might be done or of the possible hazardous consequences of each way. Consequently, Funai has not undertaken any such broad evaluation. Accordingly, a servicer who uses a service procedure or tool which is not recommended by Funai must first use all precautions thoroughly so that neither his safety nor the safe operation of the equipment will be jeopardized by the service method selected.

TABLE OF CONTENTS

BLOCK DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

SCHEMATIC DIAGRAMS / CBA’S AND TEST POINTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

DIFFERENT PARTS FROM ORIGINAL MODEL (ST419D). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

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Audio/Power Control Block Diagram

BLOCK DIAGRAMS

AUDIO SIGNAL

IC111

TV MICON/VIDEO /AUDIO/CHROMA /DEFLECTION

79P-ON-H

FROM/TO IF/VIDEO /SYSTEM CONTROL BLOCK

TU-AUDIO

JK702 AUDIO-IN

SCL SCL

SDA

AL+9V

SDA

LINE

TUNER

POWER MANAGE. MCU RESET

ATT

A-MUTE-H

40 18 28

IC801

(AMP)

MUTE

OUTPUT

+8V CTRL +5V CTRL2 +5V CTRL

TO POWER SUPPLY BLOCK

CN801

SPEAKER

SP-GND

CLN801 1 2

SP801 SPEAKER

RESET

MAIN CBA

1-1 1-2

L6408BLA

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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; electrical components having such features are identified by the mark " # " in the schematic diagram and the parts list. Before replacing any of these components, read the parts list in this manual carefully. The use of substitute replacement parts that do not have the same safety characteristics as specified in the parts list may create shock, fire, or other hazards.

Note:

1. Do not use the part number shown on these drawings for ordering. The correct part number is shown in the parts list, and may be slightly different or amended since these drawings were prepared.

2. All resistance values are indicated in ohms (K=10

3. Resistor wattages are 1/4W or 1/6W unless otherwise specified.

4. All capacitance values are indicated in µF (P=10

5. All voltages are DC voltages unless otherwise specified.

Note of Capacitors:

ML --- Mylar Cap. PP --- Metallized Film Cap. SC --- Semiconductor Cap. L --- Low Leakage type

, M=106).

-6

µF).

Temperature Characteristics of Capacitors are noted with the following:

B --- ±10% CH --- 0±60ppm/°C CSL --- +350~-1000ppm/°C

Tolerance of Capacitors are noted with the following:

Z --- +80~-20%

Note of Resistors:

CEM --- Cement Res. MTL --- Metal Res. F --- Fuse Res.

Capacitors and transistors are represented by the following symbols.

CBA Symbols

(Top View) (Bottom View)

(Bottom View)

Transistor or Digital Transistor

E C B

(Top View)

NPN Transistor

Electrolytic Capacitor

(Top View)

PNP Transistor

Schematic Diagram Symbols

Digital Transistor

E C B

(Top View)

E C B

NPN Digital Transistor

E C B

(Top View)

PNP Digital Transistor

E C B

2-1 L13SC

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LIST OF CAUTION, NOTES, AND SYMBOLS USED IN THE SCHEMATIC DIAGRAMS ON THE FOLLOWING PAGES:

1. 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. CAUTION: Fixed Voltage (or Auto voltage selectable) power supply circuit is used in this unit.

If Main Fuse (F601) is blown, first check to see that all components in the power supply circuit are not defective before you connect the AC plug to the AC power supply. Otherwise it may cause some components in the power supply circuit to fail.

3. Note:

(1) Do not use the part number shown on the drawings for ordering. The correct part number is shown in the

parts list, and may be slightly different or amended since the drawings were prepared.

(2) To maintain original function and reliability of repaired units, use only original replacement parts which are

listed with their part numbers in the parts list section of the service manual.

4. Wire Connectors

(1) Prefix symbol "CN" means "connector" (can disconnect and reconnect). (2) Prefix symbol "CL" means "wire-solder holes of the PCB" (wire is soldered directly).

5. Note: Mark "I" is a leadless (chip) component.

6. Voltage indications on the schematics are as shown below: Plug the TV power cord into a standard AC outlet.:

Voltage

7. How to read converged lines

1-D3

Distinction Area Line Number (1 to 3 digits)

Examples:

1. "1-D3" means that line number "1" goes to area "D3".

2. "1-B1" means that line number "1" goes to area "B1".

8. Test Point Information

: Indicates a test point with a jumper wire across a hole in the PCB.

: Used to indicate a test point with a component lead on foil side.

: Used to indicate a test point with no test pin.

5.0

(3.0)

231

5.0 (3.0)

Indicates that the voltage is not consistent here.

Power on mode

Power off mode

Unit: Volts

AREA D3

ABCD

AREA B1

1-D3

1-B1

: Used to indicate a test point with a test pin.

2-2 L13SC

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Main 1/3 Schematic Diagram

VIDEO SIGNAL

AUDIO SIGNAL

MAIN 1/3

Ref No. Posit ion

ICS IC111 IC151 IC801

TR ANSIST ORS Q111 D-1 Q321 E-2

CONNECTO RS

CN301 CN801 A-1

C-2

A-4 B-1

A-4

2-3 2-4

L6408SCM1

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DIFFERENT PARTS FROM ORIGINAL MODEL (ST419D)

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.

NOTES:

1. Parts that are not assigned part numbers (---------) are not available.

2. Tolerance of Capacitors and Resistors are noted with the following symbols.

C.....±0.25% D.....±0.5% F.....±1%

G.....±2% J......±5% K.....±10%

M.....±20% N.....±30% Z.....+80/-20%

Ref. No. Description Part No.

Mechanical Parts

A1 FRONT CABINET L6119UV 0EM101223 A2 CONTROL PLATE L6119UV 0EM301705 A4# RATING LABEL L6408UJ ---------PB4 CHASSIS NO.LABEL L6408UJ ---------S1 CARTON L6408UJ 0EM408581 S6 SERIAL NO. LABEL L6408UJ ---------S7 LABEL, EAS(H3761UD) MAKER

NO.ZLLFNSLE1

X1# OWNER'S MANUAL(E)/(S)

L6408UJ:ENGLISH/SPANISH

X2 REMOTE CONTROL 130/ERC001/

N0158UD or REMOTE CONTROL 100/

ECNL1301/NE152UD

X4 RETURN STOP SHEET T4259UK 0EM406203A

Electrical Parts

MMA-422 CBA 0ESA05765 C642 Not Used C643# CERAMIC CAP. 0.0047µF F CS or CCG2HMN0F472

# SAFETY CAP. 4700pF/250V or CCG2EMA0F472 # SAFETY CAP. E M 4700pF/250V KHCCG2EMP0E472

----------

0EMN02270

N0158UD

NE152UD

JK801 Not Used JS801 PCB JUMPER D0.6-P5.0 JW5.0T R801 Not Used

3-1 L6408PL

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EWT19B4 L6408UJ

Printed in Japan

2003-09-15 HO