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S/M No. : TCM905SEF0

Service Manual
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

Specification
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

DAEWOO ELECTRONICS CO., LTD
http : //svc.dwe.co.kr June.2001
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

-1-
SPECIFICATIONS
CAUTION

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

-2-
SAFETY INSTRUCTION
CAUTION

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

X-RAY RADIATION PRECAUTIONS

1. Excessive high voltage can produce potentially hazard- of the high voltage recorded as a part of the service
ous X-RAY RADIATION. To avoid such hazards, the recorded as a part of the service records. It is important
high voltage must not exceed the specified limit. The to use an accurate and reliable high voltage meter.
nominal value of the high voltage of this receiver is 2. The only source of X-RAY RADIATION in this TV
25kV(21") at max beam current. The high voltage must receiver is the picture tube. For continuous RADIATION
not, under any circumstances, exceed 27kV(21"). protection, the replacement tube must be exactly the
Each time a receiver requires servicing, the high volt- same type tube as specified in the "PART LIST".
age should be checked. It is recommended the reading

SAFETY PRECAUTIONS

1. Potentials of high voltage are present when this 2. If any FUSE in this TV receiver is blown, replace it will
receiver is operating. Operation of the receiver outside the FUSE specified in the "PART LIST".
the cabinet or with the back cover removed involves a 3. When replacing a high wattage resistor (oxide metal
shock hazard from the receiver. film resistor) in circuit board, keep the resistor 10mm
1) Servicing should not be attempted by anyone who is away from circuit board.
not thoroughly familiar with the precautions necessary 4. Keep wires away from high voltage or high temperature
when working on high voltage equipment. components.
2) Always discharge the picture tube to avoid the shock 5. This receiver must operate between AC 100~240 volts,
harzard before removing the anode cap. 50/60Hz. NEVER connect to DC supply or any other
3) Discharge the high potential of the picture tube before power or frequency.
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 ments, electrical components having such features are
special safety-related characteristics. identified by designated symbol on the "PART LIST".
These characteristics are often passed unnoticed by a Before replacing any of these components, read the "PART
visual inspection and the X-RAY RADIATION protection LIST" in this manual carefully.
afforded by them cannot necessarily be obtained by using The use of substitute replacement part which do not have
replacement components rated for higher voltage, wattage, the same safety characteristics as specified in the "PART
etc. LIST" may created X-RAY RADIATION.
Replacement parts which have these special safety char-
acteristics are identified in this manual and its supple-

-3-
CIRCUIT BLOCK DIAGRAM
CAUTION

-4-
ALIGNMENT INSTRUCTIONS
CAUTION
1. AGC ADJUSTMENT

1) Pattern : PAL 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 Vol-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 : PAL 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 : PAL 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.

-5-
ALIGNMENT INSTRUCTIONS

5-3. HORIZONTAL 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 : PAL 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 : PAL 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 : PAL 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.

-6-
ALIGNMENT INSTRUCTIONS

6. REMOCON

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

POWER
RECALL MUTE

S1 S2 S3

S4 S5 S6

S7 S8 S9
S10 S12
S11

TV/CATV ADD/ERASE TV/VIDEO

NOISE CLEAR
SOUND MODE SURROUND

CH

MENU
VOL VOL

CH

PIP POSITION M/S

PAUSE/
TV/VIDEO STILL CH VOL

V-
POSITION SIZE SLEEP 1 2

3 4 5 6

7 8 9 0

R-34SVC

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

-7-
CM-905S/SF TYPICAL SERVICE DATA
CAUTION

CM-905S/SF SVC KEY & FUNCTION DESCRIPTION
EY N NAME RFUNCTION
PRESS THE S1 ONE TINE ----> PRESS THE S1 ANOTHER TIME
S1 HEATRUN MODE ON/OFF
(HEATRUN MODE) (NORMAL OPRATION)
* FBT SCREEN ADJUSTMENT
SCREEN
S2 PRESS THE S2 ON TIME ----> PRESS THE S2 ANOTHER TIME
ADJUSTMENT ON/OFF
(HORIZONTAL KINE) (NORMAL OPRATION)
* SOUND TEST
PRESS THE S3 KEY IS TOGGLE
S3 SOUND TEST
VOLUME 00 ----> VOLUME 32 ----> VOLUME 63---> Line Production
BALANS LEFT ----> BALANS RIGHT ----> BALANS 00 ----> RELEAS
* PICTURE TEST
PRESS THE S4 KEY IS TOGGLE
S4 PICTURE TEST
CONTRAST 00 ----> CONTRASR 32 ----> CONTRAST 63 ----> Line Production
RRIGHT 00 ----> BRIGHT 32 ----> BRIGHT 63 ---->
COLOR 00 ----> COLOR 32 ----> COLOR 63 ----> RELEASE
* ADJUST NORMAL1 DATA INITIAL DATA
CONTRAST 48 63
S5 NORMAL1 RRIGHT 38 23
COLOR 38 32
SHARPNESS 28 32
* ADJUST GEOMETRY DATA
21 inch Normal 21 inch Flat Normal INITIAL DATA(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

PIP * ADJUST PIP DATA INITIAL DATA
S7 21 inch Normal 21 inch Flat Normal
R 220 220 128
G 220 220 128
B 220 220 128

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

CM-905S/SF SVC KEY & FUNCTION DESCRIPTION
WHITE BALANCE * ADJUST WHITE BALANCE DATA
RB R LOW BEAM 127
GB G LOW BEAM 146
S8
BB B LOW BEAM 125
GG G HIGH BEAM 52
BG B HIGH BEAM 52
SUB-BRIGHT ADJUST BRIGHTNESS DATA 35
S9
SUB-CONTRAST ADJUST SUB CONTRAST DATA 15
* MAIN RF AGC ADJUSTMENT KEY
AGC TUNER AGC VOLTAGE 3.5Vdc
S10
AUTO-AGC
DATA 32
* OPTION MODE ADJUSTMENT KEY INITIAL DATA
TEXT ARABIC/CYRILLIC/IRANIAN/EAST-LATIN//WEST-LATIN ARABIC
S11
POWER-ON-START ON/OFF ON
DIGITAL EYE ON/OFF ON
* OUT DATA
PICTURE NORMAL 1
BLUE SCREEN ON
BASS CENTER
TREBLE CENTER
BALANCE CENTER
EFFECT OFF
CLOCK
ON TIMER
S12 ON TIMER
OFF
ON/OFF
ON PR 1
OFF TIMER
OFF TIMER
OFF
ON/OFF
LANGUAGE ENGLISH
COLOR SYSTEM PAL
SOUND SYSTEM BG
SOUND MODE MEMORY
NAME(EACH PR) ----
TV/AV1/AV2 TV

-9-
CM-905S/SF TYPICAL SERVICE DATA

CM-905S/SF SVC KEY & FUNCTION DESCRIPTION
TV/TEXT TV
LAST PR 1
VOLUME
S12
PICTURE SIZE NORMAL ( 4:3 )
CHILD LOCK OFF
CH LOCK OFF

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 DATA changed
RB 128
GB 0
SCREEN BB 0
GG 64
BG 64
Brightness 32
7 DIGITAL EYE DIGITAL 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

- 10 -
SCHEMATIC DIAGRAM

- 11 -
PRINTED CIRCUIT BOARD
PCB MAIN

- 12 -
MECHANICAL EXPLODED VIEW AND PARTS LIST
CAUTION

1. DTD-21D7

- 13 -
MECHANICAL EXPLODED VIEW AND PARTS LIST

2. DTD-21D6

- 14 -
MECHANICAL EXPLODED VIEW AND PARTS LIST

3. DTD-21D4

- 15 -
MECHANICAL EXPLODED VIEW AND PARTS LIST

4. DTD-21D3

- 16 -
MECHANICAL EXPLODED VIEW AND PARTS LIST

5. DTD-21U6

- 17 -
MECHANICAL EXPLODED VIEW AND PARTS LIST

6. DTD-21U8

- 18 -
ELECTRICAL PARTS LIST
CAUTION
" " is safety component, so it must be used the same component.
"