Daewoo DTD-20D3, DTD-14D7, DTD-20D4, DTD-21D6, DTD-21D3 Service Manual

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Service Manual

Items Model DTD-14D3/20D3/21D3 ME/MT/MP/MZ

14D4/20D4/21D4 ME/MT/MP/MZ 14D6/21D6 ME/MT/MP/MZ 14D7/20D7/21D7 ME/MT/MP/MZ

21U6/21U8 ME/MT/MP/MZ TV Standards PAL-SECAM-B/G,D/K,I,NTSC-M,NTSC-4.43(AV) Mains V oltage AC 100~250V , 50/60Hz Power Consumption Stand-by mode : 5W

Normal Operating Mode : 14”=85W, 20”=95W, 21”=105W, 21”(flat)=115W Sound Ouput1 14/20”=5W+5W Over(80% MOD.at 1KHz THD.10%)

21U6=5W+5W Over(80% MOD.at 1KHz THD.10%)

21”,21U8=7W+7W Over(80% MOD.at 1KHz THD.10%) Speaker 14/20”=7.5W 8 Ohm (2pcs)

21U6=5W 8 Ohm (2pcs) , 21”,21U8=12W 8 Ohm (2pcs) Antenna 75 Ohm Unbalanced. (DIN Standard) Tuning System FS Tuning System Memory Channel 100 Channels Remocon Control R-44C07 Reception Channel VHF - BAND1 : CH2-CH4

BAND2 : CH5-CH12 CABLE BAND : S1’-S3, S1-S20 HYPER BAND : S21-S41

UHF-BAND : CH21-CH69 Remark OSD

TELETEXT (Top & Flop Teletext)

PIP(AV PIP, Swap, Size, Position)

Digital Eye

Colour Television CHASSIS : CM-905S/SF Model :

DTD-

14D3/20D3/21D3 ME/MT/MP/MZ 14D4/20D4/21D4 ME/MT/MP/MZ 14D6/21D6 ME/MT/MP/MZ 14D7/20D7/21D7 ME/MT/MP/MZ 21U6/21U8 ME/MT/MP/MZ

S/M No. : TCM905SEF0

DAEWOO ELECTRONICS CO., LTD

http : //svc.dwe.co.kr June.2001

Specification

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TABLE OF CONTENTS

SPECIFICATIONS .............................................................................................................. 2

SAFETY INSTRUCTION .................................................................................................... 3

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

ALIGNMENT INSTRUCTIONS .......................................................................................... 5

CM-905S/SF TYPICAL SERVICE DATA ............................................................................ 8

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

PRINTED CIRCUIT BOARD .............................................................................................. 12

MECHANICAL EXPLODED VIEW AND PARTS LIST ...................................................... 13

ELECTRICAL PARTS LIST ............................................................................................... 19

CM-905S/SF EACH MODEL PARTS LIST ........................................................................ 29

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

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

TROUBLE SHOOTING CHARTS ...................................................................................... 19

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Items Model DTD-14D3/20D3/21D3 ME/MT/MP/MZ

14D4/20D4/21D4 ME/MT/MP/MZ 14D6/21D6 ME/MT/MP/MZ 14D7/20D7/21D7 ME/MT/MP/MZ

21U6/21U8 ME/MT/MP/MZ TV Standards PAL-SECAM-B/G,D/K,I,NTSC-M,NTSC-4.43(AV) Mains Voltage AC 100~250V , 50/60Hz Power Consumption Stand-by mode : 5W

Normal Operating Mode :

14”=85W, 20”=95W, 21”=105W, 21”(flat)=115W

Sound Ouput1 14/20”=5W+5W Over(80% MOD.at 1KHz THD.10%)

21U6=5W+5W Over(80% MOD.at 1KHz THD.10%)

21”,21U8=7W+7W Over(80% MOD.at 1KHz THD.10%) Speaker 14/20”=7.5W 8 Ohm (2pcs)

21U6=5W 8 Ohm(2pcs) , 21”,21U8=12W 8 Ohm (2pcs) Antenna 75 Ohm Unbalanced. (DIN Standard) Tuning System FS Tuning System Memory Channel 100 Channels Remocon Control R-44C07 Reception Channel VHF - BAND1 : CH2-CH4

BAND2 : CH5-CH12 CABLE BAND : S1’-S3, S1-S20 HYPER BAND : S21-S41

UHF-BAND : CH21-CH69 Remark OSD

TELETEXT (Top & Flop Teletext)

PIP(AV PIP, Swap, Size, Position)

Digital Eye

SPECIFICATIONS

CAUTION

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SAFETY INSTRUCTION

CAUTION

NOTE

BEFORE SERVICING THIS CHASSIS READ THE “X-RAY RADIATION PRECAUTIONS”, “SAFETY PRECAUTIONS” AND “PRODUCT SAFETY NOTICE” BELOW.

X-RA Y RADIATION PRECAUTIONS

1. Excessive high voltage can produce potentially hazardous X-RAY RADIA TION. To avoid such hazards, the high voltage must not exceed the specified limit. The nominal value of the high voltage of this receiver is 25kV(21”) at max beam current. The high voltage must not, under any circumstances, exceed 27kV(21”). Each time a receiver requires servicing, the high voltage should be checked. It is recommended the reading

SAFETY PRECAUTIONS

1. Potentials of high voltage are present when this receiver is operating. Operation 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) Always discharge the picture tube to avoid the shock harzard before removing the anode cap.

3) 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.

PRODUCT SAFETY

Many electrical and mechanical parts in this chassis have special safety-related characteristics. These characteristics are often passed unnoticed by a visual inspection and the X-RA Y RADIA TION protection afforded by them cannot necessarily be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts which have these special safety characteristics are identified in this manual and its supple-

ments, electrical components having such features are identified by designated symbol on the “P ART LIST”. Before replacing any of these components, read the “PA RT LIST” in this manual carefully . The use of substitute replacement part which do not have the same safety characteristics as specified in the “P ART LIST” may created X-RA Y RADIATION.

of the high voltage recorded as a part of the service recorded as a part of the service records. It is important to use an accurate and reliable high voltage meter.

2. The only source of X-RAY RADIA TION in this TV receiver is the picture tube. For continuous RADIATION protection, the replacement tube must be exactly the same type tube as specified in the “PA RT LIST”.

2. If any FUSE in this TV receiver is blown, replace it will the FUSE specified in the “P ART 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 temperature components.

5. This receiver must operate between AC 100~240 volts, 50/60Hz. NEVER connect to DC supply or any other power or frequency.

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CIRCUIT BLOCK DIAGRAM

CAUTION

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ALIGNMENT INSTRUCTIONS

CAUTION

1. AGC ADJUSTMENT

1) Pattern : P AL B/G 10CH Color BAR (RF Level = 60 dB)

2) Connect the Pattern Generator RF Output to Tuner RF Input.

3) Press the S10 Key of Service Remocon to enter the “AGC MODE”.

4) Execute the “AUTO AGC” using the V ol-Up Key.

2. SCREEN ADJUSTMENT

1) Pattern : PAL B/G Retma

2) Press the NORMAL Key to set the “NORMAL 1” mode.

3) Press the S2 Key of Service Remocon.

4) Adjust the SCREEN VOLUME on FBT so that the horizontal line reach the cut-off point.

3. FOCUS ADJUSTMENT

1) Pattern : PAL B/G Retma

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

4. WHITE BALANCE ADJUSTMENT

1) Press the NORMAL Key to set the “NORMAL 1” mode.

2) Press the S8 Key of Service Remocon to enter the “WHITE BALANCE” mode.

3) Adjust the each color ( R,G,B ) which appears abnormally on the screen.

5. GEOMETRIC ADJUSTMENT

1) Press the NORMAL Key to set the “NORMAL 1” mode.

2) Press the S6 Key of Service Remocon to enter the “GEOMETRIC” mode.

5-1. VERTICAL CENTER ADJUSTMENT

1) Pattern : P AL B/G Retma

2) Choose the “V-CENTER” using the Pr-Up/Down Keys.

3) Adjust the horizontal line of picture to coincide with the mechanical center marks of the CRT using the Vol-Up/Down Keys.

If the pattern is smaller than the screen, adjust the V-size to fit.

5-2. VERTICAL SIZE ADJUSTMENT

1) Pattern : P AL B/G Retma

2) Choose the “V-SIZE” using the Pr-Up/Down Keys.

3) Adjust the vertical size of the picture using the Vol-Up/Down Keys.

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5-3. HORIZONT AL CENTER ADJUSTMENT

1) Pattern : PAL B/G Retma

2) Choose the “H-CENTER” using the Pr-Up/Down Keys.

3) Adjust the vertical line of picture to coincide with the mechanical center marks of the CRT using the Vol-Up/Down Keys.

5-4. HORIZONTAL SIZE ADJUSTMENT

1) Pattern : P AL B/G Retma

2) Choose the “H-SIZE” using the Pr-Up/Down Keys.

3) Set each side over scan to be 10% using the Vol-up/Down Keys.

5-5. PINCUSHION ADJUSTMENT

1) Pattern : P AL B/G Crosshatch

2) Choose the “PARABOLA” using the Pr-Up/Down Keys. Adjust parabola width to fit on screen.

3) Choose the “CONER” using the Pr-Up/Down Keys. Adjust coner parabola to fit on screen.

4) Choose the “TRAPEZIUM” using the Pr-Up/Down Keys, Adjust trapezium to fit on screen.

5-6. S-CORRECTION ADJUSTMENT

1) Pattern : P AL B/G Crosshatch

2) Choose the “S-CORRECTION” using the Pr-Up/Down Keys.

3) Adjust each distance of horizontal line to be the same using the Vol-Up/Down Keys.

5-7. SUB-BRIGHTNESS ADJUSTMENT

1) Pattern : PAL B/G Retma

2) Press the NORMAL Keys to set the “NORMAL 1” mode.

ALIGNMENT INSTRUCTIONS

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ALIGNMENT INSTRUCTIONS

6. REMOCON

6-1. SERVICE REMOCON 6-2. USER REMOCON

6-3. SERVICE REMOCON

1) Enter SERVICE MODE : Press keys of User Remocon, as follows. Ch91, Sharpness 0, Skip(red), Move(green), Menu.

2) Choice SERVICE MENU : Pr-Up/Down

3) Enter SERVICE SUB MENU : Vol-Up/Down

4) Adjust SERVICE MENU : Vol-Up/Down

S1 S2 S3

S4 S5 S6

S7 S8 S9

S11

RECALL

S10 S12

MUTE

POWER

TV/CATV

ADD/ERASE

TV/VIDEO

SOUND MODE

SURROUND

NOISE CLEAR

VOLVOL

PIP M/S

CH VOL

VPOSITION

POSITION

TV/VIDEO

PAUSE/

STILL

SIZE SLEEP

3456

R-34SVC

890

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CM-905S/SF TYPICAL SERVICE DAT A

CAUTION

CM-905S/SF SVC KEY & FUNCTION DESCRIPTION

EY N NAME RFUNCTION

PRESS THE S1 ONE TINE ----> PRESS THE S1 ANOTHER TIME (HEATRUN MODE) (NORMAL OPRATION)

FBT SCREEN ADJUSTMENT PRESS THE S2 ON TIME ----> PRESS THE S2 ANOTHER TIME (HORIZONTAL KINE) (NORMAL OPRATION)

SOUND TEST PRESS THE S3 KEY IS TOGGLE VOLUME 00 ----> VOLUME 32 ----> VOLUME 63---> BALANS LEFT ----> BALANS RIGHT ----> BALANS 00 ----> RELEAS

PICTURE TEST PRESS THE S4 KEY IS TOGGLE CONTRAST 00 ----> CONTRASR 32 ----> CONTRAST 63 ----> RRIGHT 00 ----> BRIGHT 32 ----> BRIGHT 63 ----> COLOR 00 ----> COLOR 32 ----> COLOR 63 ----> RELEASE

ADJUST NORMAL1 DAT A INITIAL DAT A

CONTRAST 48 63 RRIGHT 38 23 COLOR 38 32 SHARPNESS 28 32

ADJUST GEOMETRY DA T A

21 inch Normal 21 inch Flat Normal INITIAL DAT A(50Hz)

V-CENTER 04 04 04

V-SIZE 54 58 27

H-CENTER 11 12 14

H-SIZE 53 52 58

S6 PARABORA 27 48 27

TRAPEZIUM 15 17 15

CORNER 05 05 05

H-EHT 03 03 03

S-CORRECTION 08 08 07

V-LINEARITY 08 07 09

V-EHT 03 03 03

ADJUST PIP DAT A

21 inch Normal 21 inch Flat Normal

R 220 220 128

G 220 220 128 B 220 220 128

HEATRUN MODE

SCREEN

ADJUSTMENT

SOUND TEST

PICTURE TEST

PIP

INITIAL DAT A

Line Production

ON/OFF

NORMAL1

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CM-905S/SF SVC KEY & FUNCTION DESCRIPTION

WHITE BALANCE

ADJUST WHITE BALANCE DATA RB R LOW BEAM 127 GB G LOW BEAM 146 BB B LOW BEAM 125

GG G HIGH BEAM 52 BG B HIGH BEAM 52

SUB-BRIGHT ADJUST BRIGHTNESS DA T A 35

SUB-CONTRAST ADJUST SUB CONTRAST DA T A 15

MAIN RF AGC ADJUSTMENT KEY

AGC TUNER AGC VOL TAGE 3.5Vdc

AUTO-AGC

DAT A 32

OPTION MODE ADJUSTMENT KEY INITIAL DAT A

TEXT ARABIC/CYRILLIC/IRANIAN/EAST-LATIN//WEST-LATIN ARABIC

POWER-ON-STA RT ON/OFF ON

DIGITAL EYE ON/OFF O N

OUT DAT A

PICTURE NORMAL 1

BLUE SCREEN ON

BASS CENTER

TREBLE CENTER

BALANCE CENTER

EFFECT OFF

CLOCK ON TIMER ON TIMER

ON/OFF

ON PR 1 OFF TIMER OFF TIMER

ON/OFF

LANGUAGE ENGLISH

COLOR SYSTEM P A L

SOUND SYSTEM BG

SOUND MODE MEMORY

NAME(EACH PR) ----

TV/AV1/AV2 TV

S10

S11

S12

OFF

CM-905S/SF TYPICAL SERVICE DA TA

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CM-905S/SF SVC KEY & FUNCTION DESCRIPTION

TV/TEXT TV LAST PR 1

VOLUME

PICTURE SIZE NORMAL ( 4:3 )

CHILD LOCK OFF

CH LOCK OFF

S12

CM-905S/SF TYPICAL SERVICE DA TA

SUB MENU

NO NAME FUNCTION

1 PIP ON / OFF (PIP) ON/OFF display a sub-picture 2 SWAP (PIP) The main picture and sub-picture are swapped 3 SIZE (PIP) The sub-picture will be smaller . To return to be normal size, Press this button again. 4 TV / VIDEO (PIP) To select the input for the sub pictrue 5 POSITION (PIP) The display position of the sub-picture will changed 6 S2 DA TA changed

RB 128 GB 0

SCREEN BB 0

GG 64 BG 64

Brightness 32 7 DIGITAL EYE DIGIT AL DYE funtion ON/OFF 8 ZOOM Picture size changed ( 4:3 -> 16:9 -> ZOOM -> 4:3 ->

...

. )

9 TEXT TEXT funtion ON/OFF

10 CH UP USING the SERVICE MODE to CH UP/DOWN 11 CH DOWN 12 RESISTER 13 RELEASE