DAEWOO DTQ-29S2FCC, DTQ-26S2FCC Service Manual

S/M No. : TCN013AEF0

Service Manual

Color Television

CHASSIS : CN-013

Model :

DTQ-29S2FCC DTQ-26S2FCC

DTQ-26S2FCC / DTQ-29S2FCC

SPECIFICATIONS

MODEL

ITEMS

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

U.S.A

DTQ-26S2FCC DTQ-29S2FCC

NTSC-M

AC 120V 60Hz

97W 95W

Frequency Synthesizer(FS)Tuning System

VHF:2~13(12) UHF:14~69(65) CATV:1~125(125)

1.6W x 1.6W x 0.5W 3W 8ohm

75ohm Unbalanced

Front : Video, Audio Rear:Video

(In/Out : MTI, Out :Matrix speaker)

Picture IF Carrier Frequency :45.75MHz Sound IF Carrier Frequency :41.25MHz Color Sub-Carrier Frequency :42.17MHz

R-43A01

3-Language OSD With CAPTION Wake-up On/Off Time Sleep Timer Power Restore

, Audio

✔

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).

DAEWOO ELECTRONICS CO., LTD

http : //svc.dwe.co.kr

Feb. 2002.

TABLE OF CONTENTS

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

SPECIFICATIONS ......................................................................................................... 4

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

ALIGNMENT INSTRUCTIONS.......................................................................................... 6

1. SERVICE MODE ADJUSTMENTS........................................................................................................ 6

2. ASSEMBLY ADJUSTMENTS................................................................................................................ 7

SCHEMATIC DIAGRAM................................................................................................ 11

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

PRINTED CIRCUIT BOARD............................................................................................. 14

SERVICE PARTS LIST ..................................................................................................... 15

1. DIFFERENT PARTS LIST ..................................................................................................................... 22

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

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

TROUBLE SHOOTING CHARTS ...................................................................................... 13

PRODUCT SAFETY SERVICING GUIDELINES FOR COLOR TELEVISION RECEIVERS

CAUTION : Do not attempt to modify this product in any way. Unauthorized modifications will not only void the warranty, but may lead to your being liable for any resulting property damage or user injury. Service work should be performed only after you are thoroughly familiar with all of the following safety checks and servicing guidelines. To do otherwise, increases the risk of potential hazards and injury to the user.

SAFETY CHECKS

After the original service problem has been corrected, a check should be made of the following:

SUBJECT : FIRE & SHOCK HAZARD

1. Be sure that all components are positioned in such a way as to avoid possibility of adjacent component shorts. This is especially important on those chassis which are transported to and from the repair shop.

2. Never release a repair unless all protective devices such as insulators, barriers, covers, shields, strain reliefs, and other hardware have been reinstalled per original design.

3. Soldering must be inspected to discover possible cold solder joints, frayed leads, damaged insulation (including A.C. cord), solder splashes or sharp solder points. Be certain to remove all loose foreign particals.

4. Check for physical evidence of damage or deterioration to parts and components, and replace if necessary follow original layout, lead length and dress.

5. No leads or components should touch a receiving tube or a resistor rated at 1 watt or more. Lead tension around protruding metal surfaces must be avoided.

6. All critical components such as fuses, flameproof resistors, capacitors, etc. must be replaced with exact factory types. Do not use replacement components other than those specified or make unrecommended circuit modifications.

7. After re-assembly of the set always perform an A.C. leakage test on all exposed metallic parts of the cabinet, (the channel selector knob, antenna terminals, handle and screws) to be sure the set is safe to operate without danger of electrical shock. Do not use a line isolation transformer during this test. Use an A.C. voltmeter, having 5000 ohms per volt or more sensitivity, in the following manner : connect a 1500 ohm 10 watt resistor, paralleled by a 15 mfd. 150V A.C. type capacitor between a known good earth ground (9water pipe, conduit, etc.) and the exposed metallic parts, one at a time. Measure the A.C. voltage across the combination of 1500 ohm resistor and 0.15 MFD capacitor. Reverse the A.C. plug and repeat A.C. voltage measurements for each exposed metallic part. Voltage measured must not exceed 0.75 volts R.M.S. This corresponds to 0.5 milliamp A.C. Any value exceeding this limit constitutes a potential shock hazard and must be corrected immediately.

A.C. VOLTMETER

GRAPHIC SYMBOLS :

The lightning flash with arrowhead symbol, within an equilateral triangle, is intended to alert the service personnel to the presence of uninsulated “dangerous voltage” that may be of sufficienty magnitude to constitute a risk of electric shock.

The exclamation point within an equilateral triangle is intended to alert the service personnel to the presence of important safety information in service literature.

Fuse symbol is printed on pcb adjacent to the fuse, with “RISK OF FIRE REPLACE FUSE AS MARKED”. The symbol is explained in the service manual with the following wording or equivalent.

“CAUTION :

FOR CONTINUED PROTECTION AGAINST FIRE HAZARD, REPLACE ONLY WITH SAME TYPE (5A, 125V)” and “

ATTENTION

: AFIN D’ASSU UNE PROTECTION PERMANENTE CONTRE LES RISQUES D’INCENDIE, REMPLACER UNIQUEMENT PAR UN FUSIBLE DE MEME TYPE ET DE ”5A, 125V”.

SUBJECT : X-RADIATION

1. Be sure procedures and instructions to all service personnel cover

the subject of X-rays in current T.V. receivers is the picture tube. However, this tube does not emit X-rays when the high voltage is at the factory specified level. The proper value is given in the applicable schematic. Operation at higher voltages may cause a failure of the picture tube or high voltage supply and, under certain circumstances, may produce radiation in excess of desirable levels.

2. Only factory specified C.R.T. anode connectors must be used.

Degaussing shields also serve as X-ray shield in color sets. Always re-install them.

3. It is essential that the serviceman has available an accurate and

reliable high voltage meter. The calibration of the meter should be checked perio - dically against a reference standard. Such as the one available at your distributor.

4. When the high voltage circuitry is operating properly there is no

possibility of an X-radiation problem. Every time a color chassis is serviced, the brightness should be run up and down while monitoring the high voltage with a meter to be certain that the high voltage does not exceed the specified value and that it is regulating correctly. We suggest that you and your service organization review test procedures so that voltage regulation is always checked as a standard servicing procedure. And that the high voltage reading be recorded on each customer’s invoice.

5. When troubleshooting and making test measurements in a receiver

with a problem of excessive high voltage, avoid being unnecessarily close to the picture tub eand the high voltage compartment. Do not operate the chassis longer than is necessary to locate the cause of excessive voltage.

6. Refer to HV, B+and Shutdown adjustment procedures described in

the appropriate schematic and diagrams(where used).

Good earth ground, such as the water pipe, conduit, etc.

0.15 uF

1500 OHM

10WATT

Place this probe on each exposed metal part.

SUBJECT : IMPLOSION

1. All direct viewed picture tubes are equipped with an integral implosion protection system, but care should be taken to avoid damage during installation. Avoid scratching the tube. If scratched, replace it.

2. Use only recommended factory replacement tubes.

SUBJECT : TIPS ON PROPER INSTALLATION

1. Never install any receiver in closed-in recess, cubbyhole or closely fitting shelf space over, or close to heat duct, or in the path of heated air flow.

2. Avoid conditions of high humidity such as : Outdoor patio installations where dew is a factor. Near steam radiators where steam leakage is a factor, etc.

3. Avoid placement where draperies may obstruct rear venting. The customer should also avoid the use of decorative scarves or other coverings which might obstruct ventilation.

4. Wall and shelf mounted installations using a commercial mounting kit, must follow the factory approved mounting instructions. A receiver mounted to a shelf or platform must retain its original feet(or the equivalent thickness in spacers) to provide adequate are flow across the bottom, bolts or screws used for fasteners must not touch and parts or wiring. Perform leakage test on customized installations.

5. Caution customers against the mounting of a receiver on sloping shelf or a tilted position, unless the receiver is properly secured.

6. A receiver on a roll-about cart should be stable on its mounting to the cart. Caution the customer on the hazards of trying to roll a cart with small casters across thresholds or deep pile carpets.

7. Caution customers against the use of a cart or stand which has not been listed by underwriters laboratories, inc. For use with their specific model of television receiver or generically approved for use with T.V.’s of the same or larger screen size.

SPECIFICATIONS

MODE

DTQ-29S2FCC DTQ-26S2FCC REMARKS

ITEMS

TV STANDARD NTSC-M POWER INPUT AC120V 60Hz POWER CONSUMPTION

97W 95W

TUNNING SYSTEM

Frequency Synthesizer (FS) Tuning System

VHF : 2 ~ 13 (12)

TUNING RANGES UHF : 14 ~ (56)

CATV : 1 ~ 125 (125) SOUND OUTPUT 1.6W X 1.6W X 0.5W SPEAKER 3W 8 ohm ANTENNA INPUT

75 ohm Unbalanced

IMPEDANCE AUXILARY

Front : Video, Audio

INPUT TERMINAL

Rear : Video, Audio

(In/Out : M.T.I, Out : Matrix Speaker)

INTERMEDIATE

Picture IF Carrier Frequency : 45.75 MHz

FREQUENCIES

Sound IF Carrier Frequency : 41.25 MHz

Color Sub-Carrier Frequency : 42.17 MHz

REMOTE CONTROL R-43A01

3-Language OSD

With CAPTION

SPECIAL FUNCTIONS

Wake-up On/Off Time

Sleep Timer

Power Restore

SAW

TRAP

IF DET.

OUT

BPF

KTC-3229

CONTROL

SCREEN FOCUS H.V

KTC-3229

CIRCUIT BLOCK DIAGRAM

SPEAKER OUT

MATRIX SPEAKER OUT

SOUND

AMP

TDA7267

RGB

14V

200V

FBT

132V

HEATER

27V

10V

SCL SDA

MSP3420G

SOUND IC

RGB

MAIN IC

DCT814B

TA7347P

VIDEO S/W IC

A/V IN 1 A/V IN 2

FILTER

SCL

SDA

OSD RGB

X- RAY

2SD2578

HOR.OUT

LA7845

VERTICAL

SOUND SCL

SOUND SDA

DEFLECTION YOKE

OCP

45V

MICOM

LC863240

SDA

33V

TUNER

DT5 - NF20F

SCL

DATA OUT

Protocol

Interface)

CLOCK

DATA IN

SW1~6

M.T.I.

(Multi

Television

SCL

SDA

EEPROM

14V

12V

SMPS TRANS

TSM- 4242B5

POWER IC

STR- F6626

HYBRID IC

ALIGNMENT INSTRUCTIONS

1. 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 → DISPLAY → MUTE

•

Then, the screen will appear as follows.

S2 SCRN

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

•

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

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)

NECESSARY UNNECESSARY

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) 20 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) 3 0 ~ 31 Must be set to 6

Vertical Linearity (V LIN) 23 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 27 0 ~ 27 Tint 27 0 ~ 27 Color 15 0 ~ 27

DATA

INITIAL RANGE

REMARKS

indicates the items with different settings each of sets

2. 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 20 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 VSC 3 VLIN 23

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 shown in below.

D.P. SUB BRIGHTNESS 64 CONTRAST 27 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 = 27

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

CN-013 CHASSIS

+ 25 hidden pages