DAEWOO DTQ-29S3FC, DTQ-26S3FC, DTQ-26S3FCM Service Manual
S/M No. : TCN011NEF0
Service Manual
Color Television
CHASSIS : CN-011
Model :
DTQ-29S3FC
DTQ-26S3FC
DTQ-26S3FCM
DTQ-29S3FC
SPECIFICATIONS
MODEL
ITEMS
TV STANDARD
POWER INPUT
POWER CONSUMPTION
TUNING SYSTEM
TUNING RANGES
SOUND OUTPUT
SPEAKER
ANTENNA INPUT
IMPEDANCE
AUXILIAR Y
INPUT TERMINAL
INTERMEDIA TE
FREQUENCIES
REMOTE CONTROL
SPECIAL FUNCTIONS
DTQ-26S3FC
DTQ-29S3FC DTQ-26S3FC DTQ-26S3FCM
97W 95W 90W
1.8W 1.8W 1.8W+1.8W 1.8W
U.S.A
Canada
DTQ-26S3FCM
NTSC-M
AC 120V 60Hz
Frequency Synthesizer(FS)Tuning System
VHF:2~13(12)
UHF:14~69(65)
CATV:1~125(125)
3W 8ohm
75ohm Unbalanced
Front : Video, Audio
Rear:Video, Audio
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
D AEW OO ELECTR ONICS CO., LTD
http : //svc.dwe .co.kr
Aug. 2000
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............................................................................................. 15
SERVICE PARTS LIST ..................................................................................................... 16
1. DIFFERENT PARTS LIST ..................................................................................................................... 23
APPENDIX ( Appendix is provided only by internet [http://svc.dwe.co.kr] )
IC DESCRIPTION......................................................................................................... 1
TROUBLE SHOOTING CHARTS ...................................................................................... 13
1
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.
2
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.
3
SPECIFICATIONS
MODEL
DTQ-29S3FC DTQ-26S3FC DTQ-26S3FCM REMARKS
ITEMS
TV STANDARD NTSC-M
POWER INPUT
POWER CONSUMPTION 97W 95W 90W
TUNING SYSTEM Frequency Synthesizer ( FS ) Tuning System
TUNING RANGES
SOUND OUTPUT 1.8W31.8W 1.8 W+1.8 W 1.8W
SPEAKER 3 W 8 ohm
ANTENNA INPUT
IMPEDANCE
AUXILIARY
INPUT TERMINAL
INTERMEDIATE
FREQUENCIES
REMOTE CONTROL R-43A01
SPECIAL FUNCTIONS
Picture IF Carrier Frequency : 45.75 MHz
Sound IF Carrier Frequency : 41.25 MHz
Color Sub-Carrier Frequency : 42.17 MHz
AC 120V 60 Hz
VHF : 2 ~ 13 (12)
UHF : 14 ~ 69 (56)
CATV : 1 ~ 125 (125)
75 ohm Unbalanced
Front : Video, Audio
Rear : Video, Audio
3-Language OSD
With CAPTION
Wake-up On/Off Time
Sleep Timer
Power Restore
4
CIRCUIT BLOCK DIAGRAM
FBT Scr een Fouse H.V .
HEATER
SOUND
AMP
TDA7267
14V
A
MP
A
VIDEO
TDA6103Q
10V
200V
27V
FBT
DA
9V 5V
SCL S
SOUND IC
MSP3435G
BPF
IF DET.
TRAP
OUT
X-RAY
HOR. OUTPUT
2SD2578
IC
A7347P
VIDEO S/W IC
T
SCL
MAIN
A/V IN 1 A/V IN 2(29 ONLY)
DCT814B
SDA
RGB
VERTICAL
LA7845
DEFLECTION YOKE
OCP
9V
SAW
FILTER
DA
S
CONTROL
5V 33V
T UNER DT5-NF20F
RF
CL
S
IR
SW1 ~
SW5
(1) (2)
5V
9V
IC
(1)
SCL
u-COM
SDA
LC863240V
OSD RGB
EEPROM
(2)
SOUND SCL
SOUND SDA
5V
14V
SMPS TRANS
26V
POWER IC
TSM-4242B5
STR-F6626
HYBRID IC
5
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
O
O
O
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)
6
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
S5
S6
S7
S8
S9
S12 Forwarding Mode - Factory Initialization
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
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.
7
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 8
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 0
VLIN 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.
8
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
9
•
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.
10
SCHEMATIC DIAGRAM
11
EXPLODED VIEW
1. DTQ-29S3FC
12
EXPLODED VIEW
2. DTQ-26S3FC
13
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