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 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

CATV VHF(L) : 5A,A,B,A-5-A-1

TUNING RANGES CH2-CH6

SOUND OUTPUT 5W + 5W SPEAKER 8 ohm 5W X 2EA ANTENNA INPUT IMPEDANCE 75 ohm Unbalanced

AUXILIARY INPUT TERMINAL

INTERMEDIATE FREQUENCIES Sound IF Carrier Frequency : 41.25 MHZ

REMOTE CONTROL R-43A01

SPECIAL FUNCTIONS

Font : Video, Audio, Earphone Rear:Video, Audio,(R,L) Picture IF Carrier Frequency : 45.75 MHZ

Color Sub-Carrer Frequency : 3.579545 MHZ

1) ICON MENU TYPE

2) 3-Language OSD

3) WITH CAPTION

4) CH LABEL

DTH-20D5FSN

UHF(H) : CH7 ~ CH13 UHF : CH14 ~ CH69

VHF(H) : C-W+11

CH7-CH13

UHF : W+12-W+84

DTH-21D4FSN

DAEWOO ELECTRONICS CO., LTD

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

TABLE OF CONTENTS

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

CIRCUIT BLOCK KIAGRAM .................................................................................................................... 3

ALIGNMENT INSTRUCTION.................................................................................................................... 4

Y our Remote Control ..........................................................................................................................................4

Service Mode Adjustment...................................................................................................................................5

Assembly Adjustment .........................................................................................................................................6

SCHEMA TIC DIAGRAM ........................................................................................................................... 10

PRINTED CIRCUIT BOARD ..................................................................................................................... 11

EXPLODED VIEW..................................................................................................................................... 12

SERVICE P ARTS LIST ............................................................................................................................. 14

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

TROUBLE SHOOTING GUIDE................................................................................................................. 34

. 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

SPECIFICATIONS

CAUTION

CM-220N

MODEL ITEM TV STAND ARD PAL-M/N POWER INPUT 220V 50/60HZ POWER CONSUMPTION 88W TUNING SYSTEM Frequency Synthesizer (FS) Tuning System

TV VHF(L) : CH2 ~ CH6

CATV VHF(L) : 5A,A,B,A-5-A-1

TUNING RANGES CH2-CH6

SOUND OUTPUT 5W + 5W SPEAKER 8 ohm 5W X 2EA ANTENNA INPUT IMPEDANCE 75 ohm Unbalanced

A UXILIAR Y INPUT TERMINAL

INTERMEDIATE FREQ UENCIES Sound IF Carrier Frequency : 41.25 MHZ

REMOTE CONTROL R-43A01

SPECIAL FUNCTIONS

Font : Video, Audio, Earphone Rear:Video, Audio ,(R,L) Picture IF Carrier Frequency : 45.75 MHZ

Color Sub-Carrer Frequency : 3.579545 MHZ

1) ICON MENU TYPE

2) 3-Language OSD

3) WITH CAPTION

4) CH LABEL

DTH-20D5FSN

UHF(H) : CH7 ~ CH13 UHF : CH14 ~ CH69

VHF(H) : C-W+11

CH7-CH13

UHF : W+12-W+84

DTH-21D4FSN

CIRCUIT BLOCK DIAGRAM

ALIGNMENT INSTRUCTION

CAUTION

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 v olume , to activate selections in the menu system.

4. VOL Use these buttons to change your TV’ s v olume , 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 yo u were watching.

ALIGNMENT INSTRUCTIONS

SERVICE MODE ADJUSTMENTS

Follow the steps belo w whene v er 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 T V.

• Push buttons of remote control in sequence as follo ws. 1 MUTE DISPLAY MUTE

• Then, the screen will appear as f ollo ws.

• 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 b utton 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.

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

PART

REPLACED

I701 Data is stored in I703

(U-COM)

I101

(MAIN)

I703

(EEPROM)

NECESSARY UNNECESSARY

ADJUSTMENT

NOTES

Initial setting values are written from I701. Adjusting ltems

S5 RF AGCD S6 H.PHASE/V.POSI/V.SIZE S8 RD/BD/RB/GB/BB S9 Subbrightness

CR T Adjust items related to picture tube only. (White Balance adjustment)

ALIGNMENT INSTRUCTIONS

Table-B

MODE ADJUSTMENT ITEMS REMARKS

S2 Screen Adjustment - -

Auto RF A GC - Video Le vel (VIDEOL) 7 0~7 Must be set to 7 RF AGC Delay (RFA GCD)

FM Lev el (FM.LEV) 8 0~31 Must be set to 20 AGC P oint 3.75 - Select A GC reference v oltage A/D V ALUE - Horizontal Phase(H.PHASE) Vertical Position (V.POSI) Vertical Size (V.SIZE)

NO SD POWER OFF YES - Automatically turn off in 15min for no received signal. V ertical S-Correction (V SC) 0 0~31 Must be set to 6 V ertical Linearity (V LIN) 20 0~31 Must be set to 16 Internal Black - - Display internal BLACK pattern Internal 100% White - - Displa y internal 100% WHITE

Internal 60% White - - Displa y internal 60% WHITE Internal Cross Pattern - - Displa y internal CROSS pattern Red Drive (RD) Green Drive (GD) 10 0~15 Must be set to 10 Blue Drive (BD)

Red Bias (RB) Green Bias (GB) Blue Bias (BB) Subbrightness Contrast 10 0~27

Tint 27 0~27 Color 15 0~27

S12 Forw arding Mode - F actory Initialization

DATA

INITIAL RANGE

* * *

* * * * *

0~63 Align RF AGC threshold

0~31 Align sync to flyback pulse, using internal cross pattern(S7) 0~63 Align vertical DC bias, using internal cross pattern(S7)

0~127 Align vertical amplitude, using internal cross pattern(S7)

0~127 Align RED OUT Ievel

0~127 Align BLUE OUT AC level 0~255 Align RED OUT DC Ievel 0~255 Align GREEN OUT DC Ievel 0~255 Align BLUE OUT DC Ievel 0~127 Align common RGB DC level

* 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 b utton to e xit in the screen adjustment mode.

NOTE

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

ALIGNMENT INSTRUCTIONS

2) FOCUS ADJUSTMENT

• Turn in a local station and adjust the Focus Control knob (located on FBT) f or 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 b utton to memorize the data.

4) GEOMETRIC ADJUSTMENTS (S6)

• Enter the service mode and select service adjustment S7.

• Whene v er y ou select the “S7” using the v olume up or do wn button, the screen is changing lik e this.

NORMAL BLACK WHITE100 WHITE60 CROSS

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

• Select service adjustment S6.

• You can see the OSD as shown in below.

4-1. Horizontal P osition 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 P osition Adjustment

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

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 v olume down, adjust service adjustment data of RD/GD/BD and RB/GB/BB until a good gra y scale with normal whites is obtained. ALIGNMENT INSTR UCTIONS 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 .