Daewoo CM-905S, СМ-SF Service Manual

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

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

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 hazardous X-RAY RADIATION. 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

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 RADIATION 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 “PART LIST”.

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.

2.If any FUSE in this TV receiver is blown, replace it will the FUSE specified in the “PART 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.

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-RAY RADIATION 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 symbolon the “PART LIST”. Before replacing any of these components, read the “PART LIST” in this manual carefully.

The use of substitute replacement part which do not have the same safety characteristics as specified in the “PART LIST” may created X-RAY RADIATION.

- 3 -

CIRCUIT BLOCK DIAGRAM

- 4 -

ALIGNMENT INSTRUCTIONS

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
RECALL MUTE	POWER

S1

S4

S7

S10

TV/CATV

S2	S3
S5	S6
S8	S9
	S12
S11
ADD/ERASE	TV/VIDEO

SOUND

MODE

SURROUND

NOISE CLEAR

		CH
VOL		MENU		VOL
		CH
PIP	POSITION	M/S
	TV/VIDEO	PAUSE/	CH	VOL
		STILL
V-			1	2
POSITION	SIZE	SLEEP
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

CM-905S/SF SVC KEY & FUNCTION DESCRIPTION

	EY N	NAME		RFUNCTION
	S1	HEATRUN MODE	PRESS THE S1 ONE TINE ----> PRESS THE S1 ANOTHER TIME			ON/OFF
			(HEATRUN MODE)	(NORMAL OPRATION)
	S2	SCREEN	* FBT SCREEN ADJUSTMENT
			PRESS THE S2 ON TIME ----> PRESS THE S2 ANOTHER TIME			ON/OFF
		ADJUSTMENT
			(HORIZONTAL KINE)		(NORMAL OPRATION)
				* SOUND TEST
	S3	SOUND TEST	PRESS THE S3 KEY IS TOGGLE
			VOLUME 00 ----> VOLUME 32 ----> VOLUME 63--->			Line Production
			BALANS LEFT ----> BALANS RIGHT ----> BALANS 00 ----> RELEAS
				* PICTURE TEST
	S4	PICTURE TEST	PRESS THE S4 KEY IS TOGGLE
			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
	S5			CONTRAST 48		63
		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
S8		GB	G LOW BEAM		146
		BB	B LOW BEAM		125
		GG	G HIGH BEAM		52
		BG	B HIGH BEAM		52
S9		SUB-BRIGHT	ADJUST BRIGHTNESS DATA		35
		SUB-CONTRAST	ADJUST SUB CONTRAST DATA		15
			* MAIN RF AGC ADJUSTMENT KEY
S10		AGC	TUNER AGC VOLTAGE 3.5Vdc
		AUTO-AGC
		DATA	32
			* OPTION MODE ADJUSTMENT KEY			INITIAL DATA
S11		TEXT	ARABIC/CYRILLIC/IRANIAN/EAST-LATIN//WEST-LATIN			ARABIC
		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
S12		ON TIMER
		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
S12	VOLUME
	PICTURE SIZE	NORMAL ( 4:3 )
	CHILD LOCK	OFF
	CH LOCK	OFF

SUB MENU

NO NAME

1PIP ON / OFF (PIP)

2SWAP (PIP)

3SIZE (PIP)

4TV / VIDEO (PIP)

5POSITION (PIP)

6

SCREEN

7DIGITAL EYE

8ZOOM

9TEXT

10CH UP

11CH DOWN

12RESISTER

13RELEASE

FUNCTION

ON/OFF display a sub-picture

The main picture and sub-picture are swapped

The sub-picture will be smaller. To return to be normal size, Press this button again. To select the input for the sub pictrue

The display position of the sub-picture will changed

S2 DATA changed
RB	128
GB	0
BB	0
GG	64
BG	64
Brightness	32

DIGITAL DYE funtion ON/OFF

Picture size changed ( 4:3 -> 16:9 -> ZOOM -> 4:3 -> .... )

TEXT funtion ON/OFF

USING the SERVICE MODE to CH UP/DOWN

- 10 -

SCHEMATIC DIAGRAM

- 11 -

PRINTED CIRCUIT BOARD

PCB MAIN

- 12 -

MECHANICAL EXPLODED VIEW AND PARTS LIST

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 -