NEC DTA-14V4THS Manual de usuario

NEC AUSTRALIA Pty. Ltd.

Service Manual

Oct. 2004

Color Television

CHASSIS : CP-185A (AUSTRALIA)

Model : DTA-14V4THS

DTA-20V4THS

DTA-21V4THS

NEC Model : N3481

N4881

FS572

Specification

S/M No. : TCP185AEF0

Version Pal multi system

TV Standard PAL-SECAM B/G, D/K, H, I/I (NTSC : AV nly)

Sound s stem Mono

* 1 Speaker

Power consumption 14":49W / 20":60W / 21" 68W

Speaker 3W 8 hm o 7.5W 8 hm

Teletext s stem Teletext

Aerial Input 75 hm unbalanced

Channel coverage off-air channels, S-cable channels and hyperband

Tuning s stem Ferquency synthesiser tuning system

14":34cm

Visual screen size 20’:48cm

21":51cm

Channel indication n screen display

Program selection 100 Programmes

RCA jack : Audio input and Vidio input & A/V

output(monitor out)

Auxiliar Outpup Terminal Audio - Video jack on front of cabinet in common

connection with rear RCA jack

Headphone jack on front of cabinet

Remote control R-44N08 AA Battery type

TABLE OF CONTENTS

SAFETY INSTRUCTION 2

CIRCUIT BLOCK DIAGRAM 3

ALIGNMENT INSTRUCTIONS 4

1. Service mode 4

2. Microcontroller configuration 4

3. TV SET Alignment 4~5

SCHEMATIC DIAGRAM 6

EXPLODED VIEW 7

PRINTED CIRCUIT BOARD 8

SERVICE PARTS LIST 9

FUNCTIONAL DESCRIPTION 1~6

IC DESCRIPTION 7~33

APPENDIX (Appendix is provide onl b internet [http://svc.dwe.co.kr])

X-RAY RADIATION PRECAUTION

1. Excessive high voltage can produce potentially hazardous X-RAY RADIATI N. To avoid such hazards, the high

voltage must not exceed the specified limit. The nominal value of the high voltage of this receiver is 22-23 kV (14")or

24-26 kV (20"-21")at max beam current. The high voltage must not, under any circumstances, exceed 27.5 kV (14",

20"), 29KV (21"). Each time a receiver requires servicing, the high voltage should be checked. It is important to use an

accurate and reliable high voltage meter.).

2. The only source of X-RAY Radiation in this TV receiver is the picture tube. For continued X-RAY RADIATI N

protection, the replacement tube must be exactly the same type tube as specified in the parts list.

SAFETY PRECAUTION

1. Potentials of high voltage are present when this receiver is operating. peration of the receiver outside the cabinet or

with the back cover removed involves a shock hazard from the receiver.

1) Servicing should not be attempted by anyone who is not thoroughly familiar with the precautions necessary when

working on high voltage equipment.

2) Discharge the high potential of the picture tube before handling the tube. The picture tube is highly evacuated and if

broken, glass fragments will be violently expelled.

2. If any Fuse in this TV receiver is blown, replace it with the FUSE specified in the Replacement Parts List.

3. When replacing a high wattage resistor (oxide metal film resistor) in circuit board, keep the resistor body 10 mm away

from the circuit board.

4. Keep wires away from high voltage or high temperature components.

5. This receiver must operate under AC 230 volts, 5 Hz. NEVER connect to a DC supply of any other voltage or

frequency.

PRODUCT SAFETY NOTICE

Many electrical and mechanical parts in this equipment have special safety-related characteristics. These characteristics

are often passed unnoticed by a visual inspection and the X-RAY RADIATI N protection afforded by them cannot

necessarily be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts

which have these spe- cial safety characteristics are identified in this manual and its supplements, electrical components

having such features are identified by designated symbol on the parts list. Before replacing any of these components,

read the parts list in this manual carefully. The use of substitutes replacement parts which do not have the same safety

characteristics as specified in the parts list may create X-RAY Radiation.

WARNING : nly competent service personnel may carry out work involving the testing or repair of this equipment

SAFETY INSTRUCTION

CIRCUIT BLOCK DIAGRAM

ISO1

S/W IC

ISO2

S/W IC

Monitor Out

(Audio)

Monitor Out

(Video)

I602

I702

Microcontroller configuration : Service mode

To switch the TV set into service mode please see instruction below.

Met od

1 - Select pr. number 91

2 - Adjust sharpness to minimum and exit all menu.

3 - uickly press the key sequence : RED - GREEN - menu

4 - List of service manual item

To exit SERVICE menu press menu key or Std By key.

In Service Mode press "OK" to the microcontroller i.e. the I2C bus is free and the set can be controlled by external

equipment.

Press "OK" again to allow the microcontroller to control the set again

Met od of c ange from DW REMOCON KEY CODE to NEC.

1. Select pr. number 91

2. Adjust sharpness to minimum and exit off menu.

3. Press volume Key 3times and volume Key 3times on front local key-board.

When changed NEW EEPROM(I702), Remocon key code was changed Daewoo.

In order to change NEC Remocon key code, do above procedure.

TV set Alignment

1 - G2 alignment

- Set TV in NORMAL I mode

- TV in AV mode without video signal ? Black screen.

- TV preset with WP Red, WP Green and WP Blue equal to 32.

- TV preset with Black R, Black G equal to 8.

- Adjust screen volume ( on FBT ) such that the highest cathode cut-off voltage measured on CRT board, is Vcut-

off 5V

2 - W ite balance

- Select a dark picture and adjust Black G and Black R to the desired colour temperature.

- Select a bright picture and adjust WP Red, WP Green, WP Blue to the desired colour temperature.

ALIGNMENT INSTRUCTIONS

Screen size Vcut-off

14" 115V

20" & 21" 125V

No Item

1 AGC

2 Black R

3 Black G

4 WP Red

5 WP Green

6 WP Blue

7 H Shift

8 V Slope

9 V Amp

10 S Correct

11 V Shift

12 CH Lock

13 MAX Vol

14 AV Start

15 Key Lock

16 PSNS Mode

ALIGNMENT INSTRUCTIONS

3 - Focus

- Adjust the Focus volume ( on FBT ) to have the best resolution on screen.

4 - Vertical geometr

- Adjust the Vertical Amplitude, Shift, S-Correction and Slope

to compensate for vertical distortion

5 - Horizontal picture centering

- Adjust H Shift to have the picture in the center of the screen.

7 - AGC

- Adjust the antenna signal level to 64dB V 2 for Daewoo tuner (or S/S tuner)

- Set RF AGC to 0.

- Increase RF AGC level and stop when the level on pin 6 of I501 goes below 2.5 Vdc

-6-

EXPLODED VIEW

1. 14V4/20v4/21v4

-8-

PCB MAIN(CP-185A)

ELECTRICAL PARTS LIST

LOC PART CODE PART NAME DESCRIPTION REMARK

ZZ100 48B4744N08 TRANSMITTER REM C N R-44N08 (AA)

ZZ110 PTACPWE040 ACCESS RY AS DTA-21V4THS

00100 4850Q00810 BATTERY R6P/LN

00200 48586002E2 MANUAL INSTRUCTI N ENGLISH,ARABIC

M821 4858213801 BAG INSTRUCTI N L.D.P.E T0.05X250X400

ZZ120 PTBCSHE040 C VER BACK AS DTA-21V4THS

M211 4852151610 C VER BACK FR HIPS GY

M541 4855415800 SPEC PLATE 150ART P/E FILM (C/TV)

M781 4857817610 CL TH BLACK FELT 300X20X0.7

ZZ130 PTPKCPE040 PACKING AS DTA-21V4THS

10 6520010100 STAPLE PIN AUT W65

M801 485805063B B X CART N DW-3A

M811 4858189200 PAD EPS 21V4

M821 4858219101 BAG P.E P.E F AM T0.5X1300X1150

ZZ131 48519A5310 CRT GR UND NET 2101S-1015-1P

ZZ132 58G0000147 C IL DEGAUSSING DC-21SF

ZZ140 PTCACAE040 CABINET AS DTA-21V4THS

M201A 4856017303 SCREW CRT FIX 5X30 L80 BK

M201B 4856214902 WASHER RUBBER CR T2.0

M201C 4856017310 SCREW CRT FIX 5X30 L190 BK

M211A 7172401412 SCREW TAPPTITE TT2 TRS 4X14 MFZN BK

M211D 7172401412 SCREW TAPPTITE TT2 TRS 4X14 MFZN BK

M492 4854941423 BUTT N P WER FR ABS GY

M681 4856812001 TIE CABLE NYL N66 DA100

M683 4856812001 TIE CABLE NYL N66 DA100

M684 4856816300 CLAMP WIRE NYL N 6 (V0)

SP01A 7178301011 SCREW TAPPTITE TT2 WAS 3X10 MFZN

V901 4859640862 CRT A51AEZ90X27 M50

ZZ200 PTFMSJE040 MASK FR NT AS DTA-21V4THS

M191 4851934832 BUTT N CTRL 4941422+5538002

M191A 7178301212 SCREW TAPPTITE TT2 WAS 3X12 MFZN BK

M201 4852068910 MASK FR NT FR HIPS GY

M561 48556159SS MARK BRAND SILVER ETCHING HAIR-LINE

ZZ210 PTSPPWE040 SPEAKER AS DTA-21V4THS

P602A 4850703S50 C NNECT R YH025-03+35098+ULW=200

SP01 4858314010 SPEAKER SP-5070F01 3W 8 HM

ZZ290 PTMPMSE040 PCB MAIN MANUAL AS DTA-21V4THS

10 2193102005 S LDER BAR SN:PB=63:37 S63S-1320

30 2291050616 FLUX S LDER JS-64T3

40 2291050301 FLUX S LVENT IM-1000

C404 CMYH3C822J C MYLAR 1.6KV BUP 8200PF J

is a recommendable part for stock.

is safety component, so it must be used the same component.

In this Manual, some parts can be changed for improving, their performance without notice in the parts list. So, if you need the

latest parts information, please refer to PPL(Prats Price List) in Service information Center (http://svc.dwe.co.kr)

Caution

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