Daewoo DTW - 28W2F Manuel utilisateur

Service Manual

Colour Television 66 Cm WIDE STEREO

CHASSIS :WP-811N

DAEWOO ELECTRONICS CO.,LTD

http://svc.dwe.co.kr DEC.2000

MODEL :DTW - 28W2F

DTW - 2810F

S/M No: TWP811MEF0

Specifications

PAL/ SECAM-B/K, PAL-I/I', SECAM-L/L', NTSC-3.58/4.43 (Play back)

230V AC, 50Hz

75 ohm unbalanced input ( Din Standard )

TUNING SYSTEM

CRT

SYSTEM

MAIN VOLTAGE

OSD LANGUAGE

28" : W66ECK001X44

SOUND OUTPUT

DT5-BF14D

21 pin EURO-SCARTjack (AV input, TV output, RGB input)

RCAtype AV input jack

Frequency Systhesize (FS) Tuning System

NUMBER OF PROGRAM 100 program

AUX. TERMINAL

ANTENNAIMPEDANCE

REMOTE CONTROL

SPEAKER

POWER CONSUMPTION Stand-by mode : 2.0 Watts

Normal operating mode : 100 Watts

10 + 10 Watts, 10% THD at RF 60% mod. (1 kHz )

12W 8 ohm x 2 EA

TUNER

JACK AUDIO TERMINAL(AUDIO OUTL, R)

R-22D05(or R-23D05) with 2 "AAA" type batteries

TOP(5 Page memory) & FLOF(7 Page memory)

TELETEXT

21 pin EURO-SCARTjack (AV input, S-VHS input)

Headphone jack (3.5 mm )

- West option : English, German/Dutch/Flemish, French, Italian, Spanish/Portuguese,

Swedish/Finnish/Danish, Hungarian, Rumanian, Turkish

- East option : Polish, Czech/Slovak, Rumanian, Servo-croat, German/Dutch/Flemish,

French, Estonian, Lettish

- West : English, German, French, Italian, Spanish, Nethelands, Swedish

- East : English, Russian, Polish, Rumanian, Czech, Hungarian

✔

Caution

: 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(Parts Price List) in

Service Information Center (http://svc.dwe.co.kr).

TABLE OF CONTENTS

SAFETY INSTRUCTION .................................................................................................................. 2

SPECIFICATIONS ............................................................................................................................ 3

CIRCUIT BLOCK DIAGRAM ........................................................................................................... 4

ALIGNMENT INSTRUCTION ........................................................................................................... 5

SCHEMATIC DIAGRAM .................................................................................................................. 11

EXPLODED VIEW ............................................................................................................................ 13

PRINTED CIRCUIT BOARD ............................................................................................................ 15

SERVICE PARTS LIST .................................................................................................................... 16

APPENDIX (" Appendix is provided only by internet [http://svc.dwe.co.kr] ")

IC DESCRIPTION ............................................................................................................................. 1

IC DC VOLTAGE CHARTS .............................................................................................................. 18

SAFETY INSTRUCTION

WARNING

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

1. Excessive high voltage can prodece potentially haz-

ardous X-RAY RADIATION. To avoid such hazards,

the high voltage must not exceed the specified limit.

Thenominalvalueofthehighvoltageofthisreceiveris

25-27kv at max beam current. The high voltage must

not, under any circumstances, exceed 30kv.

Each time a receiver require servicing, the high volt-

age should be checked. It is imprortant to use an accu-

rate and reliable high voltage meter.

2.TheonlysourceofX-RAYRadiationinthisTVreceiver

is the picture tube. For continued X-RAY RADIATION

protection, the replacement tube must be exactly the

same type tube as specified in the parts list.

X-RAY RADIATION PRECAUTION

1. Potentials of high voltage are present when this

receiveris operating.Operation ofthe receiveroutside

the cabinet or with the back board removed involves a

shock hazard from the receiver.

1)Servicing should not be attempted by anyone who is

not thoroughly familiar with the precautions neces-

sary when working on high-voltage equipment.

2) Dischange 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 10mm

away from circuit board.

4. Keep wires away from high voltage or high tempera-

ture components.

5. This receiver must operate under AC230 volts, 50Hz.

NEVER connect to DC supply or any other power or

frequency.

SAFETY PRECAUTION

Many electrical and mechanical parts in this have

special safety-related characteristics. These charac-

teristics are often passed unnoticed by a visual

inspection and the X-RAY RADIATION protection

afforded by them cannot necessarily be obtained by

using replacement components rated for higher volt-

age, wattage, etc. Replacement parts which have

these special safety characteristics are identified in

this manual and its supplements, electrical compo-

nents having such features are identified designated

symbol on the parts list.

Before replacing any of these components, read the

parts list in this manual carefully. The use of substitute

replacement parts which do not have the same safety

characterisitics as specifide in the parts list may create

X-RAY Radiation.

PRODUCT SAFETY NOTICE

PIN Signal Designation Matching Value

1Audio Out (linked with 3) 0.5Vrms, Imp < 1 k (RF 60% MOD)

2Audio In (linked with 6) 0.5Vrms, Imp < 10 k

3Audio Out (linked with 1) 0.5Vrms, Imp < 1 k (RF 60% MOD)

4Audio Earth

5Blue Earth

6Audio in (linked with 2) 0.5Vrms, Imp < 10 k (RF 60% MOD)

7Blue in 0.7Vpp 2dB, Imp 75

8Slow (Function) Switching TV : 0-2V, PERI : 9.5 - 12V, Imp > 10 k

9Green Earth

10 NC

11 Green In 0.7Vpp 2dB, Imp 75

12 NC

13 Red Earth

14 Rapid(Blanking) Switching Earth

15 Red In, C In 0.7Vpp 2dB, Imp 75

16 Rapid(Blanking) switching Logic 0 : 0 - 0.4V, Logic 1 : 1 - 3V, Imp 75

17 Video Earth

18 Rapid Blanking Earth

19 Video Out 1Vpp 2dB, Imp 75

20 Video In, Y In 1Vpp 2dB, Imp 75

21 Common Earth

SPECIFICATIONS

CIRCUIT BLOCK DIAGRAM

ALIGNMENT INSTRUCTIONS

User Remocon

1. R-22D05

2. R-23D05

ALIGNMENT INSTRUCTIONS

* How to Enter the “ Service Mode ”with user remocon.

1) Set the TV Pr 91

2) Sharpness “ MIN “control.

3) Push the Red, Green, Menu buttons in regular sequency within 5 seconds after setting TV power off.

4) You can see the Menu of “ service mode “ on the screen.

5) The PR UP/DOWN buttons on the remote controller are used to move the selection bar up or down the Menus.

6) The VOL UP/DOWN buttons on the remote controller are used to adjust levels.

7) If you want to exit from “ Service Mode “then power the TV off.

- You can see the SVC Menu by OSD in TV set.

V. Slope

V. Center

V. Size

S. Curve

H. Center

H. Width

EW. Para

EW. Cor T

EW. CB

EW.Sym

R. b

G. b

B. b

R. d

G. d

B. d

Sub Bri

Wide

005

995

220

019

-190

510

382

028

500

021

370

311

330

315

330

021

048

Yes

SVC v1

ALIGNMENT INSTRUCTIONS

AFT

Standard B/G, D/K, Iand L

1) Set a Signal Generator with

- RF FREQUENCY = 38.9 MHz,

- RF OUTPUT LEVEL = 80 5dBuV

- Pattern = Color Bar

- System = PAL-B/G

2) Connect the Signal Generator RF Output to TP2 (Tuner IF Output).

There must be no signal input to the tuner.

3) Set the L109 to TP1(I101, #22) with DC Voltage to 2.5V 0.1V

AGC

1) Set a Pattern Generator with RF LEVEL 60 3dBuV, RF Frequency 210. 25MHz(10CH), Pattern Color Bar.

2) Connect a OSCILLOSCOPE PROBE to P101 (TUNER AGC INPUT).

3) Set the RBOI to P101(Tuner AGC Input) with DC Voltage to 2.8V 0.2V

SCREEN (G2)

1) Set a Pattern Generator with - RF Frequency : 210.25MHz (10CH)

- Pattern : RETMA

2) Select the “G2”in Menu

3) And a Horizontal Line will appear on the screen.

4) Adjust the SCREEN VOLUME on FBT barely to see the Horizontal Line.

5) Press the PR UP/DOWN keys to finish the SCREEN adjustment.

FOCUS

1) Apply a RETMA PATTERN signal.

2) Adjust the FOCUS VOLUME on FBT to obtain optimal resolution.

GEOMETRY

1. VERTICAL SLOPE ( Fixed : Adjust if need be )

1) Apply a RETMA PATTERN Signal.

2) Set the TV to Normal I mode.

3)Adjustthe highersemicircleand the lowersemicircle to bethe same, withthe V.Slope

by volume Up/Down keys.

2. VERTICAL CENTER

1) Apply a RETMA PATTERN Signal.

2) Set the TV to Normal I mode.

3) Adjust the center of the picture with the V.Center by volume Up/Down keys.

ALIGNMENT INSTRUCTIONS

3. VERTICAL SIZE

* The VERTICAL CENTER adjustment has to be done in advance.

1) Apply a RETMA PATTERN Signal.

2) Set the TV to Normal I mode.

3) Adjust the VERTICAL SIZE of the picture with the select V.size by

volume UP/DOWN keys.

4. VERTICAL S-CORRECTION ( Fixed : Adjust if need be )

1) Apply a CROSSHATCH PATTERN Signal.

2) Adjust the S-CORRECTION to obtain the same distance between

horizontal lines with the S.Curve by volume UP/DOWN keys.

5. HORIZONTAL CENTER

1) Apply a RETMA PATTERN Signal.

2) Adjust picture centering with the select H.Center by volume UP/DOWN keys.

1. WIDTH

1) Apply a RETMA PATTERN Signal.

2) Adjust the horizontal width to make a perfect circle with the select H.Width

by volume UP/DOWN keys.

2. PARA

1) Apply a CROSSHATCH PATTERN Signal.

2) Adjust the vertical line to straight with the select E.W Para by volume

UP/DOWN keys.

3. CORNER ( Fixed : Adjust if need be )

1) Apply a CROSSHATCH PATTERN Signal.

2) Adjust the vertical line to straight with the select EW.Cor T by volume

UP/DOWN keys.

4. SYMMETRY ( Fixed : Adjust if need be )

1) Apply a CROSSHATCH PATTERN Signal.

2) Adjust the symmetrical balance to be suitable with the select EW Sym by

volume UP/DOWN keys.

ALIGNMENT INSTRUCTIONS

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