DAEWOO DTQ-1468, DTQ-2068, DTQ-1463, DTQ-2063 Service Manual
CONTENTS
SPECIFICATIONS
Specification 1
Important Service Notes
Location of Control & Remote Control Unit
Block Diagram
General Alignment Instructions
Description of Semiconductor
Trouble shooting Charts
Printed Circuit Boards
Replacement Parts List
Exploded View
Schematic Diagrams
26
37
39
46
49
Television System NTSC-M
2
Power Input
3
Power Consumption
4
5
Antenna Impedance
9
Operation Frequencies
Receiving Channels
Sound Output
(at 1KHz 100% MOD)
Tuning System
WARNING
In order to prevent electric shock, do not remove lover.
No user-service able part inside. Refer servicing to qualified service personal.
AC 110V/220V, 50/60Hz
65W(14”)
75W(20”)
75ohm unbalanced
300ohm balanced with supplied balun
Picture IF 45.75MHz
Sound IF 41.25MHz
Color Sub-Carrier 42.17MHz
VHF-Channels : 2-13
UHF-Channels : 14-69
CATV : CH1, 14-125
1.5W X 2 (DTQ-1468/2068AS)
3W (DTQ-1463/2063FS)
Frequency Synthesizer
1
AV DOES NOT OPERATE
1701
#33
TV/VIDEO
TV:L
VIDEO:H
#2 SIF
#1F AGC
EXT
VIDEO IN #42
EXT
AUDIO IN #1
D204
EXT VIDEO IN
EXT AUDIO IN
I 501
M52339SP
CHECK THE
VOLTAGE
TV:2.5V
VIDEO:0.5V
CHECK THE
AUDIO WAVEFORM
CHECK THE VOLTAGE
TV:6.3V
VIDEO:3.4V
VIDEO BUFFER
SWITCHING Q205
VIDEO BUFFER
Q204
CHECK THE
VIDEO WAVEFORM
CHECK THE VOLTAGE
TV:2.5V
VIDEO:1.1V
NO VERTICAL SCAN (ONE HORIZONTAL LINE RASTER)
CHECK THE WAVEFORM
OF PIN #18 OF I501
OK
CHECK THE VOLTAGE
OF PIN 8, 13 OF I301
OK OK
CHECK THE WAVEFORM
OF PIN 12 OF I301
OK
CHECK THE CONNECTION
OF P401
NG
NG
NG
CHECK/REPLACE
I501
DISCONNECT D410 AND
MEASURE THE VOLTAGE
REPLACE
I301
NG
CHECK/REPLACE
R413
CHECK/REPLACE
OK
D.Y
32
NO RASTER
CHECK FBT 123V
OK
CHECK THE X-RAY
PROTECTION
I501 #16
NORMAL : 0[V]
OK
CHECK THE HORIZONTAL
DEFLECTION CIRCUIT
GO TO
OK
CHECK THE FBT 180V
& HEATER VOLTAGE (6.3V rms)
NG
NG
NG
CHECK/REPLACE
POWER SUPPLY CIRCUIT
REFER TO “NO POWER”
CHECK/REPLACE
Q404, R431
D407, D408
CHECK/REPLACE
R423, R417, D409
PA902
OK
CHECK THE CRT HEATER
RESISTANCE
OK
CHECK 9V, 5V LINE
(I501 #10, #19)
OK
CHECK THE WAVE FORM
OF-Y ON THE CRT BOARD
OK
CHECK THE WAVE FORM
OF CATHODE R.G.B
REFER TO SCHEMATIC DIAGRAM
NG
NG
NG
NG
REPLACE
PICTURE TUBE
(HEATER OPEN)
CHECK/REPLACE
R413, I401
CHECK/REPLACE
IF & VIDEO CIRCUIT
REFER TO “NO PICTURE”
CHECK/REPLACE
PA901, Q901~Q903
OK
END
34
NO SOUND
Vout #51
Aout #4
CHECK THE VOLTAGE
NORMAL:3.2V
VOLUME CONTROL
TRAP
4.5MHz
CHECK THE
VOLTAGE
9.3V(1/2 Vcc)
CHECK THE
VOLTAGE
18.5V
CHECK THE
VOLTAGE
18V
#7 Vcc 18V
#2 Mute
Aout #6
#5
#8
#3
#9 Ain
SOUND
MUTE
18V
SIFin #43
TVin #45
I 501
M52339SP
I 601
TDA2614
36
LED PCB
DTQ-1468/2068 DTQ-1463/2063
38
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