Daewoo CN-220B, DTQ - 20D4SSF, DTQ - 20D4AS, DTQ - 20D5FC, DTQ - 20D5FS Service Manual

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Service Manual

Color Television

CHASSIS : CN-220B/C

Model : DTQ - 20D5FS / FSP

DTQ - 20D5FC

S/M No. : CN220NTEF0R1

OCT. 2001

DAEWOO ELECTRONICS CO., LTD

http : //svc.dwe.co.kr

MODEL

ITEM

DTQ-20D5FS DTQ-20D5FSP 20D5FC

TV STANDARD NTSC-M

POWER INPUT 120V 60HZ 220V 60HZ

POWER CONSUMPTION 84W

TUNING SYSTEM Frequency Synthesizer (FS) Tuning System

TUNING RANGES

VHF : 2 ~ 13 (12)

UHF : 14 ~ 69 (56)

A~W, A- 5 ~ A-1, W + 1 ~ 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

FREQUENCIES

Picture IF Carrier Frequency : 45.75 MHZ

Sound IF Carrier Frequency : 41.25 MHZ

Color Sub-Carrer Frequency : 3.579545 MHZ

REMOTE CONTROL R - 40

SPECIAL FUNCTIONS

AV only PIP

ICON MENU TYPE

STEREO / SAP

3 - Language OSD

with Caption

SPECIFICATIONS

120V 60HZ

DTQ - 20D4AS / ASP

DTQ - 20D4SSF / SSSP

✔ Caution:In this Service 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

SAFETY INSTRUCTION .................................................................................................................. 2

SPECIFICATIONS ............................................................................................................................ 3

CIRCUIT BLOCK DIAGRAM ........................................................................................................... 5

ALIGNMENT INSTRUCTION ........................................................................................................... 6

Your Remote Control ........................................................................................................................ 6

Service Mode Adjustment ................................................................................................................. 7

Assembly Adjustment ....................................................................................................................... 8

SCHEMATIC DIAGRAM .................................................................................................................. 12

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

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

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

The Different Parts List ..................................................................................................................... 21

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

IC DESCRIPTION ........................................................................................................................... 1

Trouble Shooting Guide ............................................................................................................... 11

1. No Power .................................................................................................................................... 11

2. No Picture ................................................................................................................................... 12

3. No Sound .................................................................................................................................... 13

4. CH Don’t Stop ............................................................................................................................. 14

5. No Color ..................................................................................................................................... 15

6. No Vertical Deflection ................................................................................................................. 15

7. No On-Screen Display ................................................................................................................ 16

8. Remote Control Does not Operate ............................................................................................. 16

SAFETY INSTRUCTION

WARNING :

Only competent service personnel may carry out work involving the testing or repair of this equipment

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 22-23 kV (14”) or

24-26 kV (20” - 21”) at max beam current. The high voltage must not, under any circumstances, exceed 27.5 kV (14”,

20”), 29KV (21”). Each time a receiver requires servicing, the high voltage should be checked. 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 continued X-RAY RADIATION

protection, the replacement tube must be exactly the same type tube as specified in the parts list.

X-RAY RADIATION PRECAUTION

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)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 with the FUSE specified in the Replacement Parts List.

3. When replacing a high wattage resistor (oxide metal film resistor) in circuit board, keep the resistor body 10 mm away

from the circuit board.

4. Keep wires away from high voltage or high temperature components.

5. This receiver must operate under AC 230 volts, 5O Hz. NEVER connect to a DC supply of any other voltage or

frequency.

SAFETY PRECAUTION

Many electrical and mechanical parts in this equipment 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 spe-

cial safety characteristics are identified in this manual and its supplements, electrical components having such features are

identified by designated symbol on the parts list. Before replacing any of these components, read the parts list in this manual

carefully. The use of substitutes replacement parts which do not have the same safety characteristics as specified in the parts

list may create X-RAY Radiation.

PRODUCT SAFETY NOTICE

SPECIFICATIONS

CN-220B Chassis

MODEL

ITEM

DTQ-20D5FS

DTQ-20D5FSP

DTQ-20D4SSSP

TV STANDARD NTSC-M

POWER INPUT 120V 60HZ 220V 60HZ 120V 60HZ 220V 60HZ

POWER CONSUMPTION 84W

TUNING SYSTEM Frequency Synthesizer (FS) Tuning System

TUNING RANGES

VHF : 2 ~ 13 (12)

UHF : 14 ~ 69 (56)

A~W, A- 5 ~ A-1, W + 1 ~ W + 84

SOUND OUTPUT 5W + 5W

SPEAKER 8 ohm 5W x 2EA

ANTENNA INPUT IMPED-

ANCE

75 ohm Unbalanced

AUXILIARY INPUT TERMI-

NAL

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 - 40

SPECIAL FUNCTIONS

AV only PIP

ICON MENU TYPE

STEREO / SAP

3 -Language OSD

with Caption

DTQ-20D5FC

ICON MENU TYPE

STEREO / SAP

3 -Language OSD

with Caption

SPECIFICATIONS

CN-220C Chassis

MODEL

ITEM

DTQ-20D4AS

DTQ-20D4ASP

TV STANDARD

NTST-M

POWER INPUT

120V 60HZ

220V 60HZ

90-260V 60HZ

POWER CONSUMPTION

84W

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 - 40

SPECIAL FUNCTIONS

1) ICON MENU TYPE

2) 3-Language OSD

3) WITH CAPTION

4) CH LABEL

DTQ-20D4ASP

CIRCUIT BLOCK DIAGRAM

A H

L R

SCL SDA

(1)

(2)

OSD RGB

(1)

(2)

TUNER

DT5

-NF20F

COM IC

LC8632

SCL

SDA

SOUND

SCL

SOUND

SDA

MAIN

DCT814B

SCL

SDA RGB

SOUND IC

MSP3430G

SCL SDA

Scre

Fouse H.

FBT

HEATER

POWER IC

2SK2564

EEPROM

SW1 ~

SW5

SAW

FILTER

VIDEO

AMP

TDA

103Q

10V

28V

SOUND

AMP

TDA7266

IF DET.

OUT

TRAP

BPF

X-RAY

SMPS TRANS

TSM-3541A5

DPM001T1(110V),

DP001T1A(

220V)

14V

33V

VERTICAL

LA784

HOR. OUTPUT

SD2499

DEFLECTION YOKE

OCP

26V

14V

9V 5V

EARPHONE

A/V IN 2

220

PIP

SDA9388

CVS SCL

RGB SDA

A/V IN 1

ALIGNMENT INSTRUCTIONS

Your Remote Control

1. POWER

Use this button to turn your TV on or off.

2. 0 - 9

Use these buttons to change channels.

3. MUTE

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

4. DISPLAY

Use this buttons to display the channel

number and status.

5. CH

Use these buttons to change channels on your

TV, or select items in the menu system.

6. VOL

Use these buttons to change your TV’ s volume,

to activate selections in the menu system, or to

change audio and video settings.

7. TV/VIDEO

Use this button to select main picture source.

8. MTS

Use this button to select one mode of Mono,

Stereo or SAP.

9. PREVIOUS

Use this button to return previous channel you were

watching.

10. PIP

Use this button to turn PIP on/off.

11. STILL

Use this button to still PIP source.

12. SWAP

Use this button to exchange PIP source and main

source.

13. SCREEN

Use this button to change the size of the picture

(from normal 4:3 to WIDE, ZOOM, and the original

4:3 in turn).

14. POSITION

Use this button to change position of pip on your TV.

15. INPUT

Use this button to select PIP source (TV/VIDEO).

TV/VIDEO PREVIOUS

STILLPIP

SCREEN

POSITION

MUTE

123

456

POWER

DISPLAY

VOL

MTS

SWAP

INPUT

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)

Data is stored in I703.

I101

(MAIN)

I703

(EEPROM)

Initial setting values are written from I701.

Adjusting Items

CRT O Adjust 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) 7 0 ~ 7 Must be set to 7

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)

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

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

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.

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 thescreen.

ALIGNMENT INSTRUCTIONS

IF CONTROL

AUTO RFAGC START

VIDEOL 7

RFAGCD 10

FM.LEV 8

AGC POINT 3.75

A/D VALUE : 8DH

MOVE ADJUST RECALL : SET

GEOMETRY

H. PHASE20

V. POSI 29

V. SIZE 70

NO SD POWER OFF YES

V SC 0

V LIN 20

MOVE ADJUST RECALL : SET

NORMAL BLACK WHITE100 WHITE60 CROSS

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.

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”

EXPLODED VIEW

EPS 20D51PAD

4858193401

LDPE T0.03X1300X1000

BAG PE

4858211800

DW-3

CARTON BOX

4858055200

150 ART P/E FILM(C/TV)1SPEC PLATE

4855415800

HIPS BK

4852155601

4856214902

30X190 BK2

SCREW CRT FIXING AS

30X80 BK

2SCREW CRT FIXING AS

4856013300

PVC T1.0

4857618000

TT2 WAS 3X12 MFZN BK

SCREW TAPPTIE

TT2 WAS 3X12 MFZN BK

SCREW TAPPTIE

7128301212

CUAU+ABS BK

MARK BRAND

4855617500

14-3

14-2

10-1

9-1

4-1

14-1

PC BK

4856013302

CR T2.0

4856215402

5 TT2 TRS 4X14 MFZN BK

7172401412

4945801+5541201

4851915401

HIPS BK

4854945801

7128301212

HIPS BK

4852073601

HIPS BK

4852326511

SWPA PIE 0.5

4856716000

ABS BK

2326511+4856401+6716000

PMMA MILKY

EGI T0.5

16-1

4855313101

4855541201

4852067101

4854856401

4852539601

16-1

14-3

14-2

14-1

9-1

4-1

COVER BACK

SCREW TAPPTITE

RUBBER

CRT

BUTTON CTRL

BUTTON

DECO SENSOR

INSU PLATE

SPEAKER

MASK FRONT

DECO COVER

PANEL FRONT

PANEL

SPRING

BUTTON POWER

GRILL

MATERI AL

REMARK S

MAIN PCB

PART N AME Q'tyPART C ODENo

A48JLL9 1x50 M16

DC-20SF

CN-220C

58G0000146

4856013302

PTMPMSJ801

PTSPPWJ776

DEGAUSIN G COIL

FELT T0.7 L=200CLOTH BL ACK

4857817611

9 8

SPEAKER

PC SMOG

EGI T0.5

GRILL R

4852539800

EGI T0.5

GRILL L

48525397 00

ABS BK

SWRM

SPECIAL SCREW

4856016100

30X190 BK

4856013302

150ART P/E FILM

4855415 800

CR T2.0

48562149 02

T2S TRS 4X14 MFZN

67122401 411

T2S TRS 3X12 MFZN

7128301211

A1050P- H24 T2.0

4855615900

SWPA PIE 0.5

48567160 00

ABS BK

HIPS BK

4854945901

4852156201

4852067101

4854856601

48523266 01

18 17

1-1

CRT

WASHER RUBBER

SPEC PLATE

COVER BACK

MAIN PCB ASSY

SCREW TAPPING

BUTTON

MASK FRO NT

MARK BRAND

SPRING

BUTTON POWER

PANEL C TRL

MATERI AL

REMARK S

SCREW CRT FIXING AS.

PART NA ME Q'tyPART C ODE

EXPLODED VIEW

+ 33 hidden pages