Daewoo DTH-20D5FS Manual de usuario

Service Manual

Color Television

CHASSIS : CM-220B

Model : DTH-20D5FS

DTH-21D4FS

http : //svc.dwe.co.kr Sep. 2000

DAEWOO ELECTRONICS CO., LTD.

S/M No. : TCM220MEF0

MODEL

ITEM

TV STANDARD

POWER INPUT

POWER CONSUMPTION

TUNING SYSTEM

TUNING RANGES

SOUND OUTPUT

SPEAKER

ANTENNA INPUT IMPEDANCE

AUXILIARY INPUT TERMINAL

INTERMEDIATE FREQUENCIES

REMOTE CONTROL

SPECIAL FUNCTIONS

DTH-20D5FS DTH-2104FS

PAL-M/N

220V 50/60 HZ

88W

Frequency Synthesizer (FS) Tuning System

CATV

VHF(L) : CH 2 ~ CH 6

UHF(H) : CH 7 ~ CH 13

UHF : CH 14 ~ CH 69

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

CH 2 - CH 6

VHF(H) : C - W +11

CH 7 - CH 13

UHF : W+12 - W +84

5W + 5W

8 ohm 5W x 2EA

75 ohm Unbalanced

Font : Video, Audio, Earphone

Rear : Video, Audio, (R,L)

Picture IF Carrier Frequency : 45.75 MHZ

Sound IF Carrier Frequency : 41.25 MHZ

Color Sub-Carrer Frequency : 3.579545 MHZ

R-43A01

1) ICON MENU TYPE

2) 3-Language OSD

3) WITH CAPTION

4) CH LABEL

SPECIFICATIONS

DTH-20D5FS DTH-21D4FS

✔

Caution

: In this Manual, some parts can be changed for improving, their

performance without notice in the parts list. So, if you need the

latest parts information,please refer to PPL(Parts Price List) in

Service Information Center (http://svc.dwe.co.kr).

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

EXPLODED VIEW......................................................................................................... 11

PRINTED CIRCUIT BOARD......................................................................................... 13

SERVICE PARTS LIST................................................................................................. 14

TROUBLE SHOOTING GUIDE..................................................................................... 32

1. No Poweer.............................................................................................................................32

2. No Picture..............................................................................................................................33

3. No Sound...............................................................................................................................34

4. CH Don’t Stop........................................................................................................................35

5. No Color.................................................................................................................................36

6. No Vertical Deflection............................................................................................................36

7. No On-Screen Display...........................................................................................................37

8. Remote ControlDoes Not Operate.........................................................................................37

SPECIFICATIONS

CM-220B

MODEL

ITEM DTH-20D5FS DTH-21D4FS

TV STANDARD PAL-M/N

POWER INPUT 220V 50/60HZ

POWER CONSUMPTION 88W

TUNING SYSTEM Frequency Synthesizer (FS) Tuning System

TUNING RANGES

TV VHF(L) : CH 2 ~ CH 6

UHF(H) : CH 7 ~ CH 13

UHF : CH 14 ~ CH 69

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

CH 2 - CH 6

VHF(H) : C - W + 11

CH 7 - CH 13

UHF : W + 12 - W + 84

SOUND OUTPUT 5W + 5W

SPEAKER 8 ohm 5W x 2EA

ANTENNA INPUT IMPEDANCE 75 ohm Unbalanced

AUXILIARY INPUT TERMINAL Front : Video, Audio, Earphone

Rear: Video, Audio, (R,L)

INTERMEDIATE FREQUEN-

CIES

Picture IF Carrier Frequency : 45.75 MHZ

Sound IF Carrier Frequency : 41.25 MHZ

Color Sub-Carrer Frequency : 3.579545 MHZ

REMOTE CONTROL R - 43A01

SPECIAL FUNCTIONS

1) ICON MENU TYPE

2) 3-Language OSD

3) WITH CAPTION

4) CH LABEL

CIRCUIT BLOCK DIAGRAM

V A H V L R

SCL SDA

(1) (2)

OSD RGB

(1)

(2)

TUNER

DT5-NF20F

u-COM IC

LC863240

SCL

SDA

SOUND SCL

SOUND SDA

MAIN IC

DCT814B

SCL

SDA

RGB

SOUND IC

MSP3430G

SCL SDA

Screen Fouse H.V.

FBT

HEATER

POWER IC

2SK2677

EEPROM

SW1 ~

SW5

SAW

FILTER

VIDEO

AMP

TDA6103Q

10V

28V

SOUND

AMP

TDA7266

IF DET.

OUT

TRAP

BPF

X-RAY

SMPS TRANS

TSM-3541A5

DPM001T1A

14V

5V 33V

VERTICAL

LA7841

HOR. OUTPUT

2SD2499

DEFLECTION YOKE

OCP

26V 14V

9V 5V

EARPHONE

A/V IN 2

220V

A/V IN 1

ALIGNMENT INSTRUCTION

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 thesebuttons 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.

POWERMUTE

SLEEP PREVIOUS

VIDEOINPUTDISPLAY

1 2 3

4 5 6

7 8

VOL VOL

Your Remote Control

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.

1 MUTE DISPL

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

DISPLAY

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

REPLACED

ADJUSTMENT NOTES

NECESSARY UNNECESSARY

I701

(U-COM) OData is stored in I703.

I101

(MAIN) O

I703

(EEPROM) O

Initial setting values are written from I701.

Adjusting Items

CRT OAdjust items related to picture tube only.(White Balance adjustment)

S2 SCRN

S5 IFC

S6 GEO

S8 W/B

S9 DP

S12 FACT

S7 PTRN NORMAL

S5 RFAGCD

S6 H.PHASE/V.POSI/V.SIZE

S8 RD/BD/RB/GB/BB

S9 Subbrightness

ALIGNMENT INSTRUCTIONS

Table-B

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.

MODE ADJUSTMENT ITEMS DATA REMARKS

INITIAL RANGE

S2 Screen Adjustment --

Auto RF AGC --

Video Level (VIDEOL) 70 ~ 7 Must be set to 7

RF AGC Delay (RFAGCD) *0 ~ 63 Align RF AGC threshold

FM Level (FM.LEV) 80 ~ 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)

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) 00 ~ 31 Must be set to 6

Vertical Linearity (V LIN) 20 0 ~ 31 Must be set to 16

Internal Black --Display internal BLACK pattern

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 AC level

Green Drive (GD) 10 0 ~ 15 Must be set to 10

Blue Drive (BD) *0 ~ 127 Align BLUE OUT AC level

Red Bias (RB) *0 ~ 255 Align RED OUT DC level

Green Bias (GB) *0 ~ 255 Align GREEN OUT DC level

Blue Bias (BB) *0 ~ 255 Align BLUE OUT DC level

Subbrightness *0 ~ 127 Align common RGB DC level

Contrast 10 0 ~ 27

Tint 27 0 ~ 27

Color 15 0 ~ 27

S12 Forwarding Mode -Factory Initialization

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

NOTE

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 ofRD/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.

RD 58

GD 10

BD 65

RB 105

GB 160

BB 100

MOVE ADJUST RECALL : SET

D.P.

SUB BRIGHTNESS 64

CONTRAST 10

TINT 27

COLOR 15

MOVE ADJUST RECALL : SET

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”

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