DAEWOO DTQ-14V1FC, DTQ-20V1FC, DTQ-14V5FC, DTQ-20V4FC, DTQ-14V1FS Service Manual
...
S/M No. : CN001A-020R1
Service Manual
(Revision-1)
Color Television
CHASSIS : CN-001A
Model :
DTQ-14V1FC/20V1FC
DTQ-14V5FC/20V4FC
DTQ-14V1FS/20V1FS
DTQ-14V5FS/20V4FS
DTQ-14V3FS/20V3FS
DTQ-14U1FS/20U1FS
DTQ-14V6NB/14V6NP
DTQ-14V6FCB/14V6FCP
DTQ-14V6FBB/14V6FPP
DTQ-14V1FSP/20V1FSP
DTQ-14V5FSP/20V4FSP
DTQ-14U1FSP/20U1FSP
DTQ-14V6NBP/14V6NPP
U.S.A
Canada
America
(A C 110V)
Mexico,Chile,
Peru (AC 220V)
DTQ-14V1FC
DTQ-14V3FC
DTQ-14U1FSDTQ-14V5FC
DTQ-20V4FC
D AEW OO ELECTR ONICS CO., LTD
http : //svc.dwe .co.kr
Sep. 2000
TABLE OF CONTENTS
SAFETY PRECAUTIONS.................................................................................................................... 2
PRODUCT SAFTY SERVICING GUIDELINES FOR AUDIO - VIDEO PRODUCS......................................... 2
PRODUCT SAFTY SERVICING GUIDELINES FOR COLOR TELEVISION RECEIVERS............................. 3
SPECIFICATIONS............................................................................................................................... 5
BLOCK DIAGRAM .............................................................................................................................. 6
ALIGNMENT INSTRUCTIONS............................................................................................................ 7
SERVICE MODE ADJUSTMENTS.................................................................................................................. 7
ASSEMBLY ADJUSTMENTS.......................................................................................................................... 8
IC DESCRIPTION................................................................................................................................ 12
TROUBLE SHOOTING CHARTS ........................................................................................................ 21
NO POWER..................................................................................................................................................... 21
NO PICTURE................................................................................................................................................... 22
NO SOUND...................................................................................................................................................... 23
CH DON’T STOP............................................................................................................................................. 24
NO COLOR...................................................................................................................................................... 25
NO VERTICAL DEFLECTION......................................................................................................................... 25
NO ON-SCREEN DISPLY ............................................................................................................................... 26
REMOTE CONTROL DOES NOT OPERATE................................................................................................. 26
ELECTRICAL PARTS LIST................................................................................................................. 27
EXPLODED VIEW ............................................................................................................................... 33
1
SPECIFICATIONS
DTQ-14/20V1FC
MODEL
ITEMS
TV STANDARD NTSC-M
POWER INPUT AC 120V 60 Hz AC 220V 50/60 Hz
POWER CONSUMPTION
TUNING SYSTEM Frequency Synthesizer ( FS ) Tuning System
TUNING RANGES
DTQ-14V5/20V4FC
DTQ-14/20V1FS
DTQ-14V5/20V4FS
DTQ-14/20V3FS
DTQ-14/20U1FS DTQ-14/20U1FSP
14 = 55W
20 = 65W
VHF : 2 ~ 13 (12)
UHF : 14 ~ 69 (56)
CATV : 1 ~ 125 (125)
DTQ-14/20V1FSP
DTQ-14V5/20V4FSP
REMARKS
SOUND OUTPUT 1.3 W 1.3 W+1.3 W
SPEAKER 3 W 8 ohm
ANTENNA INPUT
IMPEDANCE
AUXILIARY
INPUT TERMINAL
INTERMEDIATE
FREQUENCIES
REMOTE CONTROL R-38T01
SPECIAL FUNCTIONS
Picture IF Carrier Frequency : 45.75 MHz
Sound IF Carrier Frequency : 41.25 MHz
Color Sub-Carrier Frequency : 42.17 MHz
75 ohm Unbalanced
Front : Video, Audio
Rear : Video, Audio
3-Language OSD
With CAPTION
Wake-up On/Off Time
Sleep Timer
Power Restore
1.3 W
5
BLOCK DIAGRAM
CRT
ABL
SPEAKER
OPTION
2
I601
4
A. MUTE
AUDIO
1
I101
1
TDA7267A
3
EXT. AUD IN
51
AUDIO DEMOD/VOL CONTROL
SOUND 12V
EXT. AUDIO
Z501
VCO
L501
VOIL
V. OUT
49
48
46
VIF
PLL
AFT
AGC
DEMOD
5
6
4
10
HEATER
A/V JACK
9
8
7
I901
1
TDA6103Q
EXT. VIDEO
TRAP
4.5MHz
VIDEO/VER.
VCC (5V)
RED
V. IN
EXT. V IN
44
43
42
192021
CHROMA/
PROCESS
LUMINANCE
34
6
2
3
GREEN
BLUE
14
13
200V
HOR/BUS VCC25
FBP
28
/VERTICAL
HORIZONTAL
15
16
H.V.
FOCUS
SCREEN
Hcp
133V
VIDEO
(200V)
HEATER
10V
25.5V
(VER. B+)
(RGB 9V/TUNER 5V)
VERT.
I401
7805
C
5V
RGB VCC
IF/VIDEO
18
PROCESS
17
27
23
VER. OUT
12
11
Q402
HOR. OUT
B
T401
45V
C
B
5
C
Q401
HOR. DR
6
I301
LA7841
HOR.
U-COM
#37
B
HOR
Q403
ON/OFF
VER. B+
SDA
ABL
V.SYNC21H.SYNC
20
12ST-BY 5V
X-RAY
OSD BLANK
OSD GREEN
OSD BLUE
OSD RED
24
23
22
I701
MICROCOMPUTER
17
10
11
RESET (L)
PW ON(H)
32.768KHz
X701
5V
IF VCC
SAW
SF101
FILTER
RF AGC
15
AGC
U102
TUNER
29 30
SDA SCK
33V 5V
IF
ANTENNA
RF INPUT
13
POWER
CH +/-
CVBS
AFT
Q703
14
19 40
34
PRE
VOL +/-
MENU
AMP
SCK
5 6
I703
EEPROM
SDA SCK
SDA
25
42
40
A.MUTE(H)
8
SCK
ST-BY 5V
27
28
37
H.OUT(L)
133V
45V
T801
D801
L801
60Hz
AC 120V
SOUND 12V
33V
ST-BY 5V
133V
12V
PW ON(H)
I801
SMPS TRANS
DIODE
BRIDGE
LINE
FILTER
DPM001T1
S
D
FET
Q801
G
6
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)
7
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 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.
NOTE
IN THE SCREEN ADJUSTMENT MODE, DONT PRESS OTHER BUTTONS EXCEPT VOLUME UP OR DOWN BUTTON.
8
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
¡ã¡åMOVE ¢¸¢ºADJUST 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. PHASE 20
V. POSI 29
V. SIZE 70
NO SD POWER OFF YES
V SC 0
V LIN 20
¡ã¡åMOVE ¢¸¢ºADJUST 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.
9
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
¡ã¡åMOVE ¢¸¢ºADJUST 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
¡ã¡åMOVE ¢¸¢ºADJUST RECALL : SET
10
•
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.
11
IC DESCRIPTION
U-COM(I701)
CABLE (H)
ST / MONO
BLUE BACK
NC
AUTO TINT
NC
1
P10
2
P11
3
P12
4
P13/PWM1
5
P14/PWM2
6
P15/PWM3
7
P16
8
P17/PWM
9
VSS
10
XT1
11
XT2
12
VDD
P07TV ONLY (H)
P06
P05
P04
P03
P02
P01
P00
P73/INT3/TOIN
P72/INT2/TOIN
P71/INT1
P70/INT0
42
POWER ON(H)
41
NC
40
AUDIO MUTE(H)
39
38
37
36
35
34
33
32
31
AKB WHITE
SOUND RESET
H.OUT
ON(L)/OFF(H)
POWER ON
ST-BY(H)
REMOCON IN
NC
NC
NC
13
KEY IN
AFT IN
AGC IN
SPARE A/D M-DATA
P84/AN4
14
P85/AN5
15
P86/AN6
16
P87/AN7
17
RES
18
FILT
19
CVIN
20
VS
21
HS R
- X'TAL : 32.768 KHz
P63/SCLK1
P62/SDA1
P61/SCLK0
P60/SDA0
BL
B
G
30
T-CLOCK
29
T-DATA
28
M-CLOCK
27
26
I
25
24
23
22
12
IC DESCRIPTION
1. Abstract.
This specification is 1-Tuner Mono Model for North/South America, CCD 1-Chip MICOM LC863228A.
It is developing software specification for tuning only NTSC and 3 system TV F/S.
* 3 System : NTSC-M, PAL-M, PAL-N.
2. H/W Outline.
1) ROM : 28,672 x 8bits.tsc
: 15,872 x 8 bits for CGROM.
2) RAM : 512 x 8bits.
: 336 x 9bits.(for CRT Display)
3) OSD Function.
¡¤
Screen Display. : 34 characters x 16 lines.(by software)
¡¤
RAM : 336 words. (9 bits per word)
Display area. : 34 words. x 8 lines.
1st control area. : 8 words. x 8 lines.
¡¤
Characters.
244 patterns programmable.
Up to 244 kinds of 16 x 17 dot characters.
Up to 244 kinds of 8 x 9 dot characters.
or
Up to 244 kinds of 16 x 32 dot characters used 16K bytes.
¡¤
Various characters attributes.
Character colors. : 16 colors
Character background colors. : 16 colors
Fringe / shadow colors. : 16 colors
Full screen colors. : 16 colors
Rounding.
Underline.
Italic character.(slanting)
¡¤
Attribute can be changed without spacing.
¡¤
Vertical display start line number can be set for each row independently.(Row can be overlapped.)
¡¤
Horizontal display start position can be set for each row independently.
¡¤
Different display modes can be set for each row independently.
Caption and Text mode/ OSD mode 1/ OSD mode 2(Quarter size)/ Simplified graphic mode.
¡¤
Ten character sizes.
Horiz. x Vert. = (1x1),(1x2),(2x2),(2x4),(0.5x0.5)
(1.5x1),(1.5x2),(3x2),(3x4),(0.75x0.5)
¡¤
Shuttering and scrolling on each row.
3. System Feature.
1) The system for TV tuning is Frequency Synthesis type.
2) Closed Captions function is interior designed.
13
IC DESCRIPTION
3) On Screen Displays function is interior designed.
4) Package. : 42 PIN SDIP.
5) Tuner (Pre-scaler.) : I2C Bus.
/PLL IC : TAU 6014-S(SIEMENS).
6) Remocon. : The IC of Transmission (MITSUBISHI M50560)
7) E2PROM. : 24C08(I2C Bus) ◊ Apply one byte Read/Write mode.
8) 6-Local Key. : A/D Input Control.(Power, Ch Up/Down, Vol Up/Down, Menu)
9) Option S/W : Port Input Option Check.
10) IF/V/C/D IC :LA76814(, The only NTSC), LA76810(, 3-system)
4. Function.
1) C. C. D. function.
- A section of C. C. D. operates FCC based specification.
2) C. C. D. controlled function.
- Closed Caption Mode. (Off<-->C1<-->C2<-->T1<-->T2<-->Off)
- CC On Mute.(Off <-->C1<-->C2<-->Off)
- Closed Caption is prior to CC On Mute.
3) Tuning Function.
- I2C Bus.
- PLL IC Interface.
- FS 181 Channel (AIR 2-69CH, CABLE 1-125CH)
- AFT Operation(Fine Tuning ) -2.5Fn+2.5MHz
- AIR/CABLE (STD, HRC, IRC ). Only Cable 5,6CH is that AFT range is cover over
broad-band. -2.5MHzFn+3.5MHz.
- Memorize Channels.(If a channel is broadcasting, the channel is memorized.)
- Direct Tuning(09KEY)
- Channel Up/Down.(Memorized Channels) -> The Ch Up/Down buttons on the Remocon and on the front panel
are same function.
- Search Channel Up/Down.(If No-Memory or only 1CH is Memory)
- Channel Memory.(ADD/DELETE)
- Channel Review Function.
- Last Channel Memory Function.
4) OSD Function.
- In Line(Video) Mode, Things(Items) that is concerned with Air and Cable disappear in the Menu.
- Channel, AV display.
- Small & Graphic ICON Menu.
.
- Volume / Picture control --> I2C Bus Control
5) The Others Function.
- Video/Audio Mute Function.
- If a Channel is no signal, after 15 minutes is Auto-Power Off Function.
14
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