DAEWOO DTQ - 20D5FSN, DTQ - 20D5FSPN, DTQ - 20D4SSPS, DTQ - 20D4SSFN, DTQ - 20D4SCN Service Manual

...

S/M No. : TCN220NTEF1

Service Manual

Color Television

CHASSIS : CN-220N

Model :

DTQ - 20D5FSN / FSPN DTQ - 20D4SSPS / SSFN / SCN DTQ - 20D4ASN / ASPN / SSN / SSPN DTQ - 14D4SSN / SSPN / SSFN

SPECIFICATIONS

MODEL

ITEM TV STANDARD NTSC-M POWER INPUT 120V 60HZ 220V 60HZ POWER CONSUMPTION 84W TUNING SYSTEM Frequency Synthesizer (FS) Tuning System

TUNING RANGES

SOUND OUTPUT 5W + 5W SPEAKER 8 ohm 5W x 2EA ANTENNA INPUT

IMPEDANCE AUXILIARY INPUT

TERMINAL

INTERMEDIATE

FREQUENCIES

REMOTE CONTROL R - 40

SPECIAL FUNCTIONS

DTQ-20D5FSN DTQ-20D5FSPN 20D4SSPS

VHF : 2 ~ 13 (12) UHF : 14 ~ 69 (56) A~W, A- 5 ~ A-1, W + 1 ~ W + 84

75 ohm Unbalanced

Front : 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

AV only PIP ICON MENU TYPE STEREO / SAP 3 - Language OSD with Caption

220V 60HZ

ICON MENU TYPE STEREO / SAP 3 - Language OSD with Caption

DAEWOO ELECTRONICS CO., LTD

http : //svc.dwe.co.kr

Apr. 2002

✔

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

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 ............................................................................................................................ 13

PRINTED CIRCUIT BOARD ............................................................................................................ 15

SERVICE PARTS LIST .................................................................................................................... 16

The Different Parts List ..................................................................................................................... 23

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

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

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

1. No Power .................................................................................................................................... 10

2. No Picture ................................................................................................................................... 11

3. No Sound .................................................................................................................................... 12

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 :

X-RAY RADIATION PRECAUTION

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.

SAFETY 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.

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

PRODUCT SAFETY NOTICE

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 special 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.

SPECIFICATIONS

CN-220N Chassis (Stereo Model)

MODEL ITEM

TV STANDARD NTSC-M

POWER INPUT 120V 50 / 60HZ 220V 50 / 60HZ 220V 50 / 60HZ

POWER CONSUMPTION 84W

TUNING SYSTEM Frequency Synthesizer (FS) Tuning System

TUNING RANGES

SOUND OUTPUT 5W + 5W

SPEAKER 8 ohm 5W x 2EA

ANTENNA INPUT IMPEDANCE

AUXILIARY INPUT TERMINAL

DTQ-20D5FSN

VHF : 2 ~ 13 (12) UHF : 14 ~ 69 (56) A~W, A- 5 ~ A-1, W + 1 ~ W + 84

75 ohm Unbalanced

Front : Video, Audio, Earphone Rear: Video, Audio, (R,L)

DTQ-20D5FSPN

DTQ-20D4SSPS

INTERMEDIATE FREQUENCIES

REMOTE CONTROL R - 40

SPECIAL FUNCTIONS

Picture IF Carrier Frequency : 45.75 MHZ Sound IF Carrier Frequency : 41.25 MHZ Color Sub-Carrer Frequency : 3.579545 MHZ

AV only PIP ICON MENU TYPE STEREO / SAP 3 -Language OSD with Caption

ICON MENU TYPE STEREO / SAP 3 -Language OSD with Caption

SPECIFICATIONS

CN-220N Chassis (Mono Model)

MODEL

ITEM

TV STANDARD

POWER INPUT

POWER CONSUMPTION

TUNING SYSTEM

TUNING RANGES

SOUND OUTPUT

SPEAKER

DTQ-14D4SSN DTQ-20D4ASN DTQ-20D4SSN

NTST-M

120V 50 / 60HZ

84W (20"), 70W (14") Frequency Synthesizer (FS) Tuning System

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

5W + 5W

8 ohm 5W x 2EA

DTQ-14D4SSPN DTQ-20D4ASPN DTQ-20D4SSPN

220V 50 / 60HZ 120V 50 / 60HZ

DTQ-14D4SSFN DTQ-20D4SSFN

90-260V 50 / 60HZ

DTQ-20D4SCN

ANTENNA INPUT IMPEDANCE

AUXILIARY INPUT TERMINAL

INTERMEDIATE FREQUENCIES

REMOTE CONTROL

SPECIAL FUNCTIONS

75 ohm Unbalanced Front : 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 - 40

1) ICON MENU TYPE

2) 3-Language OSD

3) WITH CAPTION

4) CH LABEL

CIRCUIT BLOCK DIAGRAM

12V

SOUND

AMP

TDA7266

9V 5V

SOUND IC

MSP3430G

SOUND

(2) (1)

SCL SDA

BPF

C3229

AMP TR

VIDEO

-RAY X

OCP

133V

. V

Fouse H. en

FBT

Scre

HEATER

10V

220

28V

A/V IN 2

L R V

EARPHONE

A H

A/V IN 1

33V

TRAP

DCT814B

MAIN

-NF20FN

TUNER

DT5

SCL SDA

PIP IC SDA9388

CVS SCL

RGB SDA

SC5386

HOR. OUTPUT

VERTICAL

133V

LA784

45V

33V

T801

SMPS TRANS

BRIDGE

D811~D884

I801

LINE

DEFLECTION YOKE

ST-BY 5V

DIODE

FILTER

133V

12V

SOUND 12V

I802

IC Photo

I801

Conpler

MA8630

IF DET.

OUT

SCL

SDA RGB

SAW

FI LTER

OSD RGB

LC8632 40

u-COM IC

SCL

(1)

(2)

SDA

SCL

SOUND

SDA

SOUND

SW1 ~

SW5

EEPROM

60Hz

AC 120V

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).

POWER

123

456

7809

DISPLAY

VOL

MUTE

VOL

TV/VIDEO PREVIOUS

MTS

STILLPIP

SWAP

SCREEN

POSITION

INPUT

11 15

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.

1 MUTE DISPL

Then, the screen will appear as follows.

S2 SCRN S5 IFC S6 GEO S8 W/B S9 DP S12 FACT S7 PTRN NORMAL

MUTE

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

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

I701

(U-COM)

I101

(MAIN)

I703

(EEPROM)

DISPLAY

NECESSARY UNNECESSARY

button the state which the screen is displaying each of service

ADJUSTMENT

Data is stored in I703.

Initial setting values are written from I701. Adjusting Items

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

menus

NOTES

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

ALIGNMENT INSTRUCTIONS

Table-B

MODE ADJUSTMENT ITEMS

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

S12 Forwarding Mode - Factory Initialization

FM Level (FM.LEV) 15(20) 0 ~ 31 Must be set to 15(Mono), 20(ST) 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

DATA

INITIAL RANGE

REMARKS

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 can 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.

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.

IF CONTROL

AUTO RFAGC START

VIDEOL 7

RFAGCD 10 FM.LEV 15

AGC POINT 3.75

A/D VALUE : 8DH

MOVE ADJUST RECALL : SET

ALIGNMENT INSTRUCTIONS

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 WHITE100 WHITE60 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.

GEOMETRY

H. PHASE20

V. POSI 29

V. SIZE 70

NO SD POWER OFF YES

V SC 0

V LIN 20

MOVE ADJUST RECALL : SET

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

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.

RD 58

GD 10

BD 65

RB 105

GB 160

BB 100

MOVE ADJUST RECALL : SET

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.

D.P.

SUB BRIGHTNESS 64

CONTRAST 10

TINT 27

COLOR 15

MOVE ADJUST RECALL : SET

Select Subbrightness item, adjust Subbrightness data value

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”

ALIGNMENT INSTRUCTIONS

to obtain normal

brightness level.

SCHEMATIC DIAGRAM

EXPLODED VIEW

16-1

REMARK S

MATERI AL

EPS 20D51PAD

LDPE T0.03X1300X1000

DW-3

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

HIPS BK

30X190 BK2

30X80 BK

CR T2.0

5 TT2 TRS 4X14 MFZN B K

BAG PE

CARTON BOX

4858193401

SCREW TAPPTITE

4858211800

4858055200

4855415800

7172401412

16-1

2SCREW CRT FIXING AS

COVER BACK

4852155601

111

SCREW CRT FIXING AS

RUBBER

MAIN PCB

4856214902

CRT

4856013300

4856013302

4856215402

14-3

14-2

14-1

4945801+5541201

HIPS BK

BUTTON CTRL

BUTTON

4851915401

4854945801

131211

PVC T1.0

TT2 WAS 3X12 MFZN BK

PMMA MILKY 1

DECO SENSOR

4855541201

HIPS BK

SCREW TAPPTIE

INSU PLATE

SPEAKER

MASK FRONT

4857618000

7128301212

4852073601

876

9-1

TT2 WAS 3X12 MFZN BK

CUAU+ABS BK

PC BK

DECO COVER

4855313101

HIPS BK

SWPA PIE 0.5

SCREW TAPPTIE

7128301212

4-1

PANEL

SPRING

4852326511

4856716000

432

ABS BK

EGI T0.5 2

PART N AME Q'tyPART C ODENo

BUTTON POWER

GRILL

4854856401

4852539601

2326511+4856401+6716000

MARK BRAND

PANEL FRONT

4855617500

4852067101

14-3

10-1

9-1

4-1

14-2

14-1

10-1

9-1

EXPLODED VIEW

REMARK S

HIPS BK

CN-220C

FELT T0.7 L=200CLOTH BL ACK

A48JLL9 1x50 M16

SWRM

30X190 BK

DC-20SF

CR T2.0

150ART P/E FILM

T2S TRS 4X14 MFZN

67122401 411

T2S TRS 3X12 MFZN

PC SMOG

A1050P- H24 T2.0

ABS BK

HIPS BK

SWPA PIE 0.5

MATERI AL

EGI T0.5

ABS BK

WASHER RUBBER

SPECIAL SCREW

CRT

SPEC PLATE

DEGAUSIN G COIL

SCREW CRT FIXING AS.

48562149 02

4856013302

4856016100

1716151413

58G0000146

4855415 800

SCREW TAPPING

COVER BACK

4852156201

4857817611

121110

MAIN PCB ASSY

PTMPMSJ801

SCREW TAPPING

7128301211

987

SPEAKER

BUTTON

PTSPPWJ776

4854945901

MASK FRO NT

MARK BRAND

4852067101

4855615900

654

SPRING

PANEL C TRL

48567160 00

48523266 01

PART NA ME Q'tyPART C ODE

GRILL R

GRILL L

BUTTON POWER

4852539800

48525397 00

4854856601

1-1

9 8

18 17

1 1

+ 35 hidden pages