DAEWOO DTH-20D5FSN, DTH-21D4FSN Service Manual

S/M No. : TCM220NEF0

Service Manual

Colour Television

CHASSIS : CM-220N

Model : DTH-20D5FSN

DTH-21D4FSN

DTH-20D5FSN DTH-21D4FSN

SPECIFICATIONS

MODEL		DTH-20D5FSN
ITEM				DTH-21D4FSN
TV STANDARD	PAL-M/N
POWER INPUT	220V 50/60HZ
POWER CONSUMPTION	88W
TUNING SYSTEM	Frequency Synthesizer (FS) Tuning System
	TV	VHF(L)	: CH2 ~ CH6
		UHF(H)	: CH7 ~ CH13
		UHF	: CH14 ~ CH69
	CATV	VHF(L)	: 5A,A,B,A-5-A-1
TUNING RANGES			CH2-CH6
		VHF(H) : C-W+11
			CH7-CH13
		UHF	: W+12-W+84
SOUND OUTPUT	5W + 5W
SPEAKER	8 ohm 5W X 2EA
ANTENNA INPUT IMPEDANCE	75 ohm Unbalanced
AUXILIARY INPUT TERMINAL	Font : Video, Audio, Earphone
	Rear:Video, Audio,(R,L)
	Picture IF Carrier Frequency : 45.75 MHZ
INTERMEDIATE FREQUENCIES	Sound IF Carrier Frequency : 41.25 MHZ
	Color Sub-Carrer Frequency : 3.579545 MHZ
REMOTE CONTROL	R-43A01
	1) ICON MENU TYPE

SPECIAL FUNCTIONS	2) 3-Language OSD
	3) WITH CAPTION
	4) CH LABEL

DAEWOO ELECTRONICS CO., LTD

http : //svc.dwe.co.kr

May.2001

TABLE OF CONTENTS

SPECIFICATIONS .....................................................................................................................................		2
CIRCUIT BLOCK KIAGRAM ....................................................................................................................		3
ALIGNMENT INSTRUCTION ....................................................................................................................		4
Your Remote Control ..........................................................................................................................................		4
Service Mode Adjustment ...................................................................................................................................		5
Assembly Adjustment .........................................................................................................................................		6
SCHEMATIC DIAGRAM ...........................................................................................................................		10
PRINTED CIRCUIT BOARD .....................................................................................................................		11
EXPLODED VIEW .....................................................................................................................................		12
SERVICE PARTS LIST .............................................................................................................................		14
APPENDIX (“Appendix is provided only by internet [http://svc.dwe.co.kr]”)
TROUBLE SHOOTING GUIDE .................................................................................................................		34
1. No Power ......................................................................................................................................................		34
2.	No Picture .....................................................................................................................................................	35
3. No Sound ......................................................................................................................................................		36
4.	CH Don’t Stop ...............................................................................................................................................	37
5.	No Color ........................................................................................................................................................	38
6.	No Vertical Deflection ....................................................................................................................................	38
7.	No On-Screen Display ..................................................................................................................................	39
8. Remote ControlDoes Not Operate ................................................................................................................		39

1

SPECIFICATIONS

CM-220N

MODEL		DTH-20D5FSN			DTH-21D4FSN
ITEM
TV STANDARD	PAL-M/N
POWER INPUT	220V 50/60HZ
POWER CONSUMPTION	88W
TUNING SYSTEM	Frequency Synthesizer (FS) Tuning System
	TV	VHF(L)	: CH2 ~ CH6
		UHF(H)	: CH7 ~ CH13
		UHF	:	CH14 ~ CH69
	CATV	VHF(L)	: 5A,A,B,A-5-A-1
TUNING RANGES				CH2-CH6
		VHF(H) : C-W+11
				CH7-CH13
		UHF	:	W+12-W+84
SOUND OUTPUT	5W + 5W
SPEAKER	8 ohm 5W X 2EA
ANTENNA INPUT IMPEDANCE	75 ohm Unbalanced
AUXILIARY INPUT TERMINAL	Font : Video, Audio, Earphone
	Rear:Video, Audio,(R,L)
	Picture IF Carrier Frequency : 45.75 MHZ
INTERMEDIATE FREQUENCIES	Sound IF Carrier Frequency : 41.25 MHZ
	Color Sub-Carrer Frequency : 3.579545 MHZ
REMOTE CONTROL	R-43A01
	1) ICON MENU TYPE

2) 3-Language OSD

SPECIAL FUNCTIONS

3) WITH CAPTION

4) CH LABEL

2

CIRCUIT BLOCK DIAGRAM

3

ALIGNMENT INSTRUCTION

Your Remote Control

1. POWER

Use this button to turn your TV on or off.

2. MUTE

Use to turn the TV’s sound on and off.

3. CH

Use these buttons to change your TV’s volume, to activate selections in the menu system.

4. VOL

Use these buttons to change your TV’s volume, to activate selections in the meny system,or to change audio and video settings.

5. MENU

Use this button to turn the TV’s menu system on and off.

6. DISPLAY

Use this button to display the channel numbeer and status.

7. INPUT

Use this button to select the TV’s signal source.

8. VIDEO

Use this button to display video adjustment.

9. 0-9

Use these buttons to change channels.

10. SLEEP

Use this button to program the TV to turn off after a certain time.

11. PREVIOUS

Use this button to return to the previous channel you were watching.

4

ALIGNMENT INSTRUCTIONS

SERVICE MODE ADJUSTMENTS

Follow the steps below whenever service adjustment is required. See Table- A and Table- B to determine if service adjustments are required.

1)How to enter the service mode using the user remote control.

•Turn the set on.

•Direct the remote control to the reception window of TV.

•Push buttons of remote control in sequence as follows.

1MUTE DISPLAY MUTE

•Then, the screen will appear as follows.

•Using the channel up or channel down button, select the item you wish to adjust. (The color of selected item turns into the red.)

•Press the volume up or down button to enter in the service mode you wish to adjust.

2)How to memorize the adjusted values in the service mode.

•Must press DISPL AY button the state which the screen is displaying each of service menus after all adjustments are completed each of all service menu.

Table-A : Adjust the values of service mode when a part is replaced.

PART	ADJUSTMENT				NOTES
REPLACED	NECESSARY	UNNECESSARY
I701				Data is stored in I703
(U-COM)
I101
(MAIN)
				Initial setting values are written from I701.
				Adjusting ltems
I703
				S5	RFAGCD
(EEPROM)
				S6	H.PHASE/V.POSI/V.SIZE
				S8	RD/BD/RB/GB/BB
				S9	Subbrightness
CRT				Adjust items related to picture tube only. (White Balance adjustment)

5

ALIGNMENT INSTRUCTIONS

Table-B

	MODE	ADJUSTMENT ITEMS	DATA		REMARKS
			INITIAL	RANGE
	S2	Screen Adjustment	-	-
		Auto RF AGC	-	-
		Video Level (VIDEOL)	7	0~7	Must be set to 7
	S5	RF AGC Delay (RFAGCD)	*	0~63	Align RF AGC threshold
		FM Level (FM.LEV)	8	0~31	Must be set to 20
		AGC Point	3.75	-	Select AGC reference voltage
		A/D VALUE	-	-
		Horizontal Phase(H.PHASE)	*	0~31	Align sync to flyback pulse, using internal cross pattern(S7)
		Vertical Position (V.POSI)	*	0~63	Align vertical DC bias, using internal cross pattern(S7)
	S6	Vertical Size (V.SIZE)	*	0~127	Align vertical amplitude, using internal cross pattern(S7)
		NO SD POWER OFF	YES	-	Automatically turn off in 15min for no received signal.
		Vertical S-Correction (V SC)	0	0~31	Must be set to 6
		Vertical Linearity (V LIN)	20	0~31	Must be set to 16
		Internal Black	-	-	Display internal BLACK pattern
	S7	Internal 100% White	-	-	Display internal 100% WHITE
		Internal 60% White	-	-	Display internal 60% WHITE
		Internal Cross Pattern	-	-	Display internal CROSS pattern
		Red Drive (RD)	*	0~127	Align RED OUT Ievel
		Green Drive (GD)	10	0~15	Must be set to 10
	S8	Blue Drive (BD)	*	0~127	Align BLUE OUT AC level
		Red Bias (RB)	*	0~255	Align RED OUT DC Ievel
		Green Bias (GB)	*	0~255	Align GREEN OUT DC Ievel
		Blue Bias (BB)	*	0~255	Align BLUE OUT DC Ievel
		Subbrightness	*	0~127	Align common RGB DC level
	S9	Contrast	10	0~27
		Tint	27	0~27
		Color	15	0~27
	S12	Forwarding Mode		-	Factory Initialization

* indicates the items with different settings each of sets

ASSEMBLY ADJUSTMENTS

1) SCREEN ADJUSTMENT (S2)

Enter the service mode and select service adjustment S2. You cna see the one horizontal line on the screen.

Adjust the Screen Control Volume (located on FBT) so that the horizontal line onscreen may be disappeared.

Press the volume up or down button to exit in the screen adjustment mode.

NOTE

IN THE SCREEN ADJUSTMENT MODE, DONT PRESS OTHER BUTTONS EXCEPT VOLUME UP OR DOWN BUTTON.

6

ALIGNMENT INSTRUCTIONS

2)FOCUS ADJUSTMENT

•Turn in a local station and adjust the Focus Control knob (located on FBT) for best picture details at high light condition.

3)RF AGC DELAY ADJUSTMENT (S5)

•Receive a good local channel.

•Enter the service mode and select service adjustment S5.

•You can see the OSD as shown in below.

•Select RFAGCD item, press the volume up or down button until noise or beat in picture disappears.

•Press the DISPLAY button to memorize the data.

4)GEOMETRIC ADJUSTMENTS (S6)

•Enter the service mode and select service adjustment S7.

•Whenever you select the “S7” using the volume up or down button, the screen is changing like this.

NORMAL BLACK WHITE100WHITE60 CROSS

•Using the volume up or down button, select internal cross pattern.

•Select service adjustment S6.

•You can see the OSD as shown in below.

4-1. Horizontal Position Adjustment

•Select H.PHASE item, adjust H.PHASE data value to obtain proper horizontal centering of the internal cross pattern at the left and right of the screen.

4-2.Vertical Position Adjustment

• Select V.POSI item, adjust V.POSI data value to center the raster properly on the screen.

7

ALIGNMENT INSTRUCTIONS

4-3.Vertical Size Adjustment

Select “V.SIZE” item, adjust “V.SIZE” data value to proper vertical size as follows.

5) WHITE BALANCE ADJUSTMENT (S8)

Receive a good local channel.

Enter the service mode and select service adjustment S8. You can see the OSD as shown in below.

Using volume up or volume down, adjust service adjustment data of RD/GD/BD and RB/GB/BB until a good gray scale with normal whites is obtained. ALIGNMENT INSTRUCTIONS

Press the DISPLAY button to memorize the data.

6) DIGITAL PRESET(D.P) ADJUSTMENTS (S9) SUBBRIGHTNESS ADJUSTMENT

Receive a good local channel.

Enter the service mode and select service adjustment S9. You can see the OSD as shoown in below.

8

ALIGNMENT INSTRUCTIONS

Select Subbrightness item, adjust Subbrightness data value to obtain normal brightness level. Press the DISPLAY button to memorize the data.

CONTRAST

Fixed value = 10

TINT

Fixed value = 27

COLOR

Fixed value = 15

7)FACTORY OUTGOING MODE (S12 : FACT)

If you select the S12, then the set becomes factory outgoing status. You can see the OSD “outgoing OK”

9

SCHEMATIC DIAGRAM

- 10 -

PRINTED CIRCUIT BOARD

PCB MAIN

- 11 -

EXPLODED VIEW

DTH-20D5FSN

12