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MODEL DS20424
Chassis No. 20424-00
SCHEMATIC DIAGRAMS
NOTES ON SCHEMATIC DIAGRAMS
1. All resistance values in ohms K=1,000 M=1,000,000.
2. Unless otherwise noted on schematic, all capacitor values less than 1 are expressed in µF (Micro Farad),
and the values more than 1 are in pF.
3. Unless otherwise noted on schematic, voltage reading taken with VOM from point indicated to chassis
ground. Voltage reading taken using color-bar signal VHF channel 5, all controls at normal. Line voltage at 120
volts. Some voltages may vary with signal strength.
4. Waveforms were taken with color-bar signal and controls set for normal picture. Waveforms marked with
an
may vary with signal strength.
5. The Symbol
indicates a fusible resistor, which protects the circuit from possible short circuits.
SERVICE NOTES:
1. When replacing parts on circuit boards, clamp the lead wires to terminals before soldering.
2. When replacing high wattage resistors on circuit board, keep the resistor body 10 mm (3/8) from circuit board.
3. Keep wires away from high voltage and high temperature components.
PRODUCT SAFETY NOTICE
THE COMPONENTS DESIGNATED BY A STAR ( ) ON THIS SCHEMATIC DIAGRAM DESIGNATE COMPONENTS
WHOSE VALUES ARE OF SPECIAL SIGNIFICANCE TO PRODUCT SAFETY. SHOULD ANY COMPONENT
DESIGNATED BY A STAR NEED TO BE REPLACED, USE ONLY THE PART DESIGNATED IN THE PARTS LIST. DO NOT
DEVIATE FROM THE RESISTANCE, WATTAGE AND VOLTAGE RATINGS SHOWN.
X-RADIATION WARNING NOTE
THIS TV CONTAINS CRITICAL PARTS TO PROTECT AGAINST X-RADIATION. NOMINAL 2ND ANODE VOLTAGE IS
29.1KV AT ZERO BEAM CURRENT AT 120 VOLTS AC LINE, AND MUST NOT EXCEED 31.1KV UNDER ANY
OPERATING CONDITION. SEE HIGH VOLTAGE CHECK ON PAGE 9.
INTEGRATED CIRCUITS
PHOTO COUPLERS
TRANSISTORS
TOP VIEW
TOP VIEW
B
B
B
B
E C
E C
E C
B
E
C
MARK
1
1
E
C
1
COUNT TERMINALS IN
ARROW DIRECTION
SIDE VIEW
C
E
C
E
E C
B
E
B
B
C
B
B ... BASE
C ... COLLECTOR
1
1
1
E ... EMITTER
CHIP TRANSISTORS
CHIP RESISTORS
TOP VIEW
TOP VIEW
C
B ... BASE
1
C ... COLLECTOR
1
3
3 2
E ... EMITTER
2
OUT
1
1
GND
(3)
IN
(2)
(1)
B
E
CAPACITOR AND RESISTOR CODE CHART
CAPACITOR (Example)
500 C K 1500 B
D ........................... ±0.5pF
T ............................ +50%
J ............................ ±5%
K ........................... ±10%
M ........................... ±20%
N ........................... ±30%
Characteristics
P ...........................
+100% –
Value code
Z ........................... +80%
Tolerance code
C ........................... ±0.25pF
Material code
C ........................... Ceramic
Voltage rating
E ........................... Electrolytic
F ........................... Polyester
N ........................... Polypropylene
T ............................ Tantalum
K ........................... Ceramic
H ........................... MT-Composite
P ........................... NP. Electrolytic
M ........................... MT-Polypropylene
RESISTOR (Example)
6 Y K 4.7
D ........................... ±0.5%
F ........................... ±1%
G ........................... ±2%
J ............................ ±5%
Value code
K ........................... ±10%
Tolerance code
M ........................... ±20%
Material code
F ............................ Fusible
Wattage rating
N ........................... Metalized Carbon
S ........................... Oxide Metalized
Y ........................... Wire Wound
C ........................... Solid
D ........................... Carbon Film
W .......................... Wire Wound
— 25 —
CAUTION
BLOCK DIAGRAM
4A 125V
X141
ANT
SAW
FILTER
IF
64
63
A101
UHF/VHF TUNER
61
VIDEO
WITH PLL
DET.
AGC
& BAND SW
S-SW
39
BUS SCL
32
BUS SDA
31
SW1901-1906
KEY IN
36
CONTROL KEYS
I/O
PORTS
RC IN
26
A1901
RC PRE-AMP
IIC SCL
28
IC802
6
IIC SDA
27
EEPROM
5
RESET
40
Q831
RESET
DIODES
C863
X IN
34
CLOCK
C862
CONTROL
X OUT
33
A
K
X 801
A
K
+12V
A
K
RL601
25
RELAY
A
K
L901
PS601
POSISTOR
DEGAUSING
K
COIL
T601
A
CONVERTER
TRANS.
F601
D623
LF601
K
A
AC
LINE
AC120V
FUSE
FILTER
60Hz
D624
INFRARED EMITTING
Q601
SW.
D625
A....ANODE
C601
D601-D604
K....CATHODE
FULL WAVE
RECTIFIER
D612
PHOTO
COUPLER
Q613
ERR.
AMP.
3
4A 125V
12 x 10 = 12K ohm
VOLTAGE CHARTS
NOTE: Voltages were measured using color-bar signal and the controls set for normal picture.
Device/Pin #
Volts/Mode
Device/Pin #
IC801-24
POWER ON:
POWER OFF:
D612-1
25.7
9.6
IC801-25
IC801-26
POWER ON:
POWER OFF:
D612-2
24.8
8.0
IC801-27
IC801-28
POWER ON:
POWER OFF:
D612-3
0.7
0.4
IC801-29
IC801-30
POWER ON:
POWER OFF:
D612-4
14.7
1.7
IC801-31
–
10%
IC001-1
6.0
IC801-32
IC001-2
13.2
IC801-33
IC001-3
5.6
IC801-34
IC001-4
GND
IC801-35
IC801-36
IC001-5
N.C.
0%
IC001-6
1.4
IC801-37
–
20%
IC001-7
1.4
IC801-38
IC001-8
GND
IC801-39
IC501-1
GND
IC801-40
IC501-2
14.3
IC801-41
IC501-3
29.5
IC801-42
IC501-4
2.9
IC801-43
IC501-5
2.9
IC801-44
IC501-6
29.2
IC801-45
IC501-7
2.8
IC801-46
IC601-1
130.0
IC801-47
IC601-2
28.3
IC801-48
IC601-3
GND
IC801-49
IC681-1
13.4
IC801-50
IC681-2
GND
IC801-51
IC681-3
5.0
IC801-52
IC801-1
2.5
IC801-53
IC801-2
2.5
IC801-54
IC801-3
3.2
IC801-55
IC801-4
2.4
IC801-56
IC801-5
2.2
IC801-57
IC801-6
2.2
IC801-58
IC801-7
2.2
IC801-59
IC801-8
5.1
IC801-60
IC801-9
2.5
IC801-61
IC801-10
9.2
IC801-62
IC801-11
8.1
IC801-63
IC801-12
2.3
IC801-64
IC801-13
2.4
IC802-1
IC801-14
2.6
IC802-2
IC801-15
2.2
IC802-3
IC801-16
2.2
IC802-4
IC801-17
2.3
IC802-5
IC801-18
1.7
IC802-6
IC801-19
5.1
IC802-7
IC801-20
2.7
IC802-8
IC801-21
0.5
IC1001-1
IC801-22
GND
IC1001-2
IC801-23
.04
IC1001-3
— 26 —
FOR CONTINUED PROTECTION AGAINST
A RISK OF FIRE, REPLACE ONLY WITH
THE SAME TYPE 4A, 125V FUSE.
ATTENTION: POUR MAINTENIR LA PROTECTION
CONTRE LES RISQUES D' INCENDIE UTILISER UN
FUSIBLE DE RECHANGE DE MEME TYPE 4A, 125V.
SDA
5
IC3401
SCL
MTS DECODER
6
13
TP16
Q132
BUFFER
IC1001
60
56
AV SW
3 V2 IN
54
7
VIDEO
VIDEO
1
V1 IN
AMP.
SW.
2
5
FM
FM
DET.
AMP.
Q131
23
AV1/2S
BUFFER
24
MUTE
46
S-Y IN
45
C IN
48
C0MP-Y IN
VIDEO
49
Pb IN
MATRIX
ABL
51
Pr IN
H-PULSE
37
ABL IN
10
ACL IN
H-PULSE
SYNC
44
2
SEP.
17
V-DRIVE
5
IC501
V
VERT.
DRIVE
OUTPUT
T401
H-DRIVE
TRANS.
Q401
Q402
21
H-DRIVE
H
HORIZ.
HORIZ.
DRIVE
DRIVE
OUTPUT
47
HOLD DOWN
HOLD DOWN
DETECT.
Q721
-R OUT
12
R
RGB
I/O
Q711
-G OUT
DRIVE
13
G
PORTS
CUT/
14
B
OFF
Q701
-B OUT
29
POWER
POWER ON/OFF
+200V
FAIL
AUDIO +B
15V
D806
IC681
5V
ALWAYS
D002
+26V
5V REG.
POWER FAIL
Q681
TJ1
+130V
12V SW
DRIVE
12V
IC601
+12V
D801
D429
Q486
POWER
9V
9V REG.
TJ5
REG.
Q627
12V SW.
5V
Q490
5V REG.
STANDBY MODE
B6
Q693,
ALWAYS +5V
Q695
CONTROL
Volts/Mode
Device/Pin #
Volts/Mode
Device/Pin #
1.5
IC1001-4
0
POWER ON:
Q001-B
4.9
IC1001-5
0
0
IC1001-6
5.0
POWER ON:
Q001-C
0
IC1001-7
1.8
0
IC1001-8
GND
Q001-E
Q005-B
4.8
IC3401-1
4.1
Q005-C
4.9
IC3401-2
4.1
Q005-E
4.1
IC3401-3
4.1
Q131-B
4.0
IC3401-4
4.1
Q131-C
1.9
IC3401-5
3.6
Q131-E
2.6
IC3401-6
3.7
Q132-B
4.9
IC3401-7
GND
Q132-C
0
IC3401-8
4.1
Q132-E
0
IC3401-9
4.1
Q401-B
1.8
IC3401-10
4.1
Q401-C
4.9
IC3401-11
4.1
Q401-E
4.9
IC3401-12
4.9
Q402-B
3.3
IC3401-13
4.1
Q402-C
GND
IC3401-14
1.3
Q402-E
0
IC3401-15
1.3
Q486-B
1.2
IC3401-16
0
Q486-C
2.5
IC3401-17
GND
Q486-E
2.6
IC3401-18
3.2
Q490-B
0
IC3401-19
9.1
Q490-C
2.6
IC3401-20
0
Q490-E
0.3
IC3401-21
4.1
POWER ON:
2.8
IC3401-22
4.1
Q601-G
0.3
IC3401-23
3.7
POWER ON:
5.0
IC3401-24
3.9
Q601-D
3.5
IC3401-25
4.1
POWER ON:
2.6
IC3401-26
4.1
Q601-S
5.0
IC3401-27
4.1
POWER ON:
2.5
IC3401-28
1.9
Q613-B
2.6
IC3401-29
4.1
POWER ON:
2.3
IC3401-30
4.1
Q613-C
2.8
IC3401-31
2.0
Q613-E
2.4
IC3401-32
4.1
POWER ON:
1.8
IC3401-33
4.1
Q627-B
GND
IC3401-34
4.1
POWER ON:
2.8
IC3401-35
0
Q627-C
2.8
IC3401-36
4.1
POWER ON:
GND
IC3401-37
4.1
Q627-E
GND
IC3401-38
4.1
POWER ON:
GND
IC3401-39
4.1
Q681-B
GND
IC3401-40
4.1
POWER ON:
0
IC3401-41
4.1
Q681-C
0
IC3401-42
GND
Q681-E
GND
IC3401-43
4.1
POWER ON:
5.0
IC3401-44
4.1
Q693-B
2.5
IC3401-45
4.2
POWER ON:
0
IC3401-46
GND
Q693-C
2.5
IC3401-47
4.1
POWER ON:
IC3401-48
4.1
Q693-E
Note: Voltages were measured with offset color-bar signal and controls set for normal picture.
LS OUT-L
4
3 LS OUT-R
33
34
36
37
Y
C
S-SW
K1051
S-VIDEO IN
VIDEO IN-2
K1001
REAR
AUDIO IN-2 (L)
AV IN
(AV2)
(Vertical Output)
VIDEO IN-2 (R)
Y
Pb
COMPONENT
Q001
Pr
POWER OFF
Q005
NOISE
AUDIO +B
CANCEL
SWITCH
AUDIO +B
VIDEO IN-1
K1011
AUDIO IN-1 (L)
FRONT
V
AV IN
DEFLECTION
(AV 1)
(Horizontal Output)
YOKE
H
L902
AUDIO IN-1 (R)
5
ABL
1
6/7
L
7
1
SP901
H.V.
T402
LEFT
HORIZ.
FOCUS
SPEAKER
2
IC001
OUTPUT
SCREEN
AUDIO
TRANS.
AMP.
SP902
R
6
3
HEATER
RIGHT
9
SPEAKER
LOW +B
8
4
D482
Q901
PIX TUBE
D481
D471
D428
(13V)
ANODE LEAK
(7V)
DETECT.
R428
g8tjm
Volts/Mode
Device/Pin #
Volts/Mode
POWER OFF:
POWER ON:
POWER OFF:
Q695-B
0.7
0
27.4
7.4
Q695-C
GND
POWER OFF:
1.9
17.0
POWER ON:
POWER OFF:
Q695-E
GND
27.5
8.0
13.4
Q701-B
2.4
14.0
Q701-C
154.9
14.0
Q701-E
2.2
2.2
Q711-B
2.4
9.2
Q711-C
158.0
1.5
Q711-E
2.2
1.2
Q721-B
2.3
GND
Q721-C
159.0
1.9
Q721-E
2.2
0.3
Q831-B
4.2
52.1
Q831-C
4.9
GND
Q831-E
4.9
0
130
GND
9.9
11.6
9.2
5.9
6.7
5.2
POWER OFF:
5.8
0.4
POWER OFF:
157
164
POWER OFF:
.9
0
POWER OFF:
0.3
0.1
POWER OFF:
4.7
0.1
GND
POWER OFF:
12.7
8.0
POWER OFF:
13.2
0
POWER OFF:
13.3
8.0
POWER OFF:
0.7
0
POWER OFF:
0
6.0
GND
POWER OFF:
0.5
5.2
POWER OFF:
27.4
7.1
POWER OFF:
0.6
4.7
— 27 —
WAVEFORMS
IC801-
12
IC801-
13
IC801-
14
(R-Output)
(G-Output)
(B-Output)
(Video Input)
4.0V HORIZ
3.8V HORIZ
4.0V HORIZ
1.0V HORIZ
IC501- 5
IC501- 1
Q132-E (TP16)
(Horizontal Drive)
(Inverting Input)
(Internal Video)
48 VERT
0.6V VERT
1.0V HORIZ
Q402- B
Q601- G
T402- 9
(Power Switching)
(Heater)
21V HORZ
15V 50KHz
28V HORIZ
— 28 —
IC801-
54
Q401- B
.7V HORZ
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