Durabrand DWT1905, ST419E Schematic
SUPPLEMENT
SERVICE MANUAL
This service manual shows only the differences between
the model DWT1905 and the original model ST419E.
All other information is described in the service manual
of the model ST419E.
19″ COLOR
TELEVISION
DWT1905
TABLE OF CONTENTS
The difference from the original model ST419E in ELECTRICAL
ADJUSTMENT INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Block Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Schematic Diagrams / CBA's and Test Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Different parts from the original model (ST419E) . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
VIDEO AUDIO EARPHONE
VOLUME
MENU
CHANNEL
P
O
W
E
R
The difference from the original model ST419E in ELECTRICAL ADJUSTMENT INSTRUCTIONS
For 3-1. Setting for Data Values, “VIDEO TONE---set to” becomes “ON”,
since SHARP function is installed in this model.
3-1. Setting for Data Values
General
1. Enter the Service mode.
2. To select the data value, press "VOL p" button on
the service remote control unit.
3. To set the following each data value, press "CH o
/ p" buttons on the service remote control unit.
7F --- set to 7F
LANGUAGE --- set to SPA/FRA
ACCESS CODE --- set to OFF
SOUND TYPE --- set to MONO
VIDEO TONE --- set to ON
FM-MODE --- set to OFF
V-OUT --- set to OFF
VIDEO --- set to V1
AV-MEMO --- set to OFF
STABLE SOUND --- set to OFF
FILTER --- set to OFF
PROTECTOR --- set to 1000
YUVMEMORY --- set to OFF
NO SIGNAL BRT --- set to 0
A-MUTE POL --- set to L
V-MENU --- set to OFF
1-1 L2314EA
BLOCK DIAGRAMS
IF/Video/System Control Block Diagram
TO
AUDIO/POWER
CONTROL BLOCK
KEY
SWITCH
REMOTE
SENSOR
TU-AUDIO
RCV101
70
69
66
TO
PROTECT-1
POWER SUPPLY BLOCK
PROTECT-2
P-ON-H
79
PROTECT-1
TO
PROTECT-2
676876
CRT/H.V. BLOCK
PROTECT-3
TO
BLUE5
WH301A
525150
CRT/H.V. BLOCK
WH301B
GREEN4
RED3
TO
CRT/H.V. BLOCK
ACL
H-DRIVE
FBP
V-DRIVE
5346453837
V-RAMP-F/B
MAIN CBA
WF1
CF31
AUDIO SIGNAL
IC31 (IF SIGNAL PROCESS)
VIDEO SIGNALRF/IF SIGNAL
SF1
1
EQ
AMP
2
4.5MHz
TRAP
4
VIDEO
DET
VIF
AMP
16
17
SAW
FILTER
WF6
CF32
9
AF
AMP
FM
DET
7
4.5MHz
FILTER
VCO
LPF
RF
AGC
14
IF AGC DET
AFT
Q31
6
VCO F/B
AMP
RCV-IN
KEY-IN2
KEY-IN1
63
X301
3.58MHz
16
73 75
AFT AGC-IN EXT-H
11 13 18
SCL
TV MICON/VIDEO
/AUDIO/CHROMA
/DEFLECTION
IC111
SDA
58
56
72 I2C-OPEN
VCXO
32
P-ON-H
PROTECT-1
PROTECT-2
PROTECT-3
TUNER
26
RGB DRIVE
/CUT OFF
OSD SW
/CONTRAST
RGB MATRIX
/COLOR CONT
LUMINANCE
PROCESS
CIRCUIT
LINE
24
/H.V. BLK
/BRIGHTNESS
CHROMINANCE
PROCESS
CIRCUIT
LPF
WF2
V-SYNC
PROCESS
CIRCUIT
CIRCUIT
H-SYNC
PROCESS
OSD
14
11
TU1
IF
4
SCL
SDA
AGC
EXT.CLK
SCL
TO
SDA
AUDIO/POWER
CONTROL BLOCK
IC151
(MEMORY)
7
CS
2-1
6
SCL
5
SDA
CN301(NO CONNECTION)
SDA 4
I2C-OPEN 2
SCL 5
CN301 is used for
adjustment at factory
JK701
VIDEO-IN
L2314BLIF
WF16
8
1115
SCHEMATIC DIAGRAMS / CBA'S AND TEST POINTS
Standard Notes
Many electrical and mechanical parts in this chassis have special characteristics. These characteristics often
pass unnoticed and the protection afforded by them cannot necessarily be obtained by using replacement
components rated for higher voltage, wattage, etc. Replacement parts that have these special safety
characteristics are identified in this manual and its supplements; electrical components having such features are
identified by the mark “#” in the schematic diagram and the parts list. Before replacing any of these components,
read the parts list in this manual carefully. The use of substitute replacement parts that do not have the same
safety characteristics as specified in the parts list may create shock, fire, or other hazards.
Notes:
1. Do not use the part number shown on these drawings for ordering. The correct part number is shown in the
parts list, and may be slightly different or amended since these drawings were prepared.
2. All resistance values are indicated in ohms (K = 10
3. Resistor wattages are 1/4W or 1/6W unless otherwise specified.
4. All capacitance values are indicated in µF (P = 10
5. All voltages are DC voltages unless otherwise specified.
Note of Capacitors:
ML --- Mylar Cap. PP --- Metallized Film Cap. SC --- Semiconductor Cap. L --- Low Leakage type
Temperature Characteristics of Capacitors are noted with the following:
B --- ±10% CH --- 0±60 ppm/°C CSL --- +350~-1000 ppm/°C
3
, M = 106).
-6
µF).
Tolerance of Capacitors are noted with the following:
Z --- +80~-20%
Note of Resistors:
CEM --- Cement Res. MTL --- Metal Res. F --- Fuse Res.
Capacitors and transistors are represented by the following symbols.
CBA Symbols
(Top View) (Bottom View)
+
Electrolytic Capacitor
(Bottom View)
Transistor or Digital Transistor
E C B
(Top View)
NPN Transistor
E C B
(Top View)
(Top View)
PNP Transistor
E C B
(Top View)
Schematic Diagram Symbols
Digital Transistor
E C B
NPN Digital Transistor
PNP Digital Transistor
E C B
3-1 L15N_SC
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