Block Diagram; Voltage Charts; Waveforms; Schematic Diagrams - Sanyo DS27910 Service Manual

MODEL DS27910 Chassis No. 27910-00

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 adjusted 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
31.2 KV AT ZERO BEAM CURRENT AT 120 VOLTS AC LINE, AND MUST NOT EXCEED 33.5KV UNDER ANY
OPERATING CONDITION. SEE HIGH VOLTAGE CHECK ON PAGE 8.
INTEGRATED CIRCUITS PHOTO COUPLERS
TRANSISTORS
TOP VIEW
TOP VIEW
B B B
B B
E C E C E C 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
E ... EMITTER
1 1
CHIP TRANSISTORS CHIP RESISTORS
TOP VIEW TOP VIEW
C
B ... BASE
1
C ... COLLECTOR
1 3 3 2 OUT E ... EMITTER
2
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
— 29 —

BLOCK DIAGRAM

CAUTION 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
4A 125V
FUSIBLE DE RECHANGE DE MEME TYPE 4A, 125V.
ANT
A101
H-S
IF V-S
UHF/VHF TUNER
WITH PLL
AGC
& BAND SW
RF AGC 1 2 MUTE
28 38
S1-SW
12
BUS SCL
S2-SW
34
35
BUS SDA
PIP TV/AV
32
7
PIP AV 1/2
6 IIC SCL
6
33
IC802 MAIN AV 1/2
5 IIC SDA 5
EEPROM
31
FIX/VAR
4
RC IN
A1901 BEAM
10
RC PRE-AMP VOLTAGE
DETECT.
KEY IN ABL-IN
SW1901-1906
9 30
CONTROL KEYS
IC801
C809
X IN IN SELECT
CPU
19 13
WITH
CAPTION
C808
X OUT DECODER OUT SELECT
20 11
DIODES
X 801
Y
17
OSD (R)
A K
42
OSD (G)
+12V
41
A
K OSD (B)
40
OSD (BLK)
Q658 39
RESET
RELAY
25
DRIVER
AFT S-CURVE
A K
29
A K
RL601 POWER FAIL
L901 PS601
3
RELAY
DEGAUSING POSISTOR
K POWER
COIL 27
ON/OFF
A
T601
CONVERTER
K A D694
F601 LF601 TRANS.
D621
AC LINE
AC120V
INFRARED EMITTING FUSE FILTER
60Hz
D624
Q601
SW.
A....ANODE
D625
K....CATHODE C601 IC601
D601
POWER
FULL WAVE Q604
REG.
D612
RECTIFIER OSC
PHOTO
COUPLER
Q605
ERR.
3
12 x 10 = 12K ohm
4A 125V AMP.

VOLTAGE CHARTS

NOTE: Voltages were measured using color bar signal and the controls adjusted for normal picture.
Device/Pin # Volts/Mode Device/Pin # Volts/Mode
IC101-41 GND
POWER ON: POWER OFF:
D612-1
31.9 10.9 IC101-42 GND
IC101-43 GND
POWER ON: POWER OFF:
D612-2
31.0 9.8 IC101-44 2.2
IC101-45 3.7
POWER ON: POWER OFF:
D612-3
IC101-46 2.0
–.3 0.6
IC101-47 3.0
POWER ON: POWER OFF:
D612-4 IC101-48 0
10% 13.3 1.4
–
IC101-49 2.5
IC001-1 7.7
IC101-50 GND
IC001-2 GND
IC101-51 GND
IC001-3 7.6
IC101-52 2.8
IC001-4 15.6
IC101-53 5.2
IC001-5 7.7
0% IC101-54 2.7
IC001-6 10.7
IC101-55 2.7
– 20% IC001-7 2.1
IC101-56 2.3
IC001-8 1.4
IC101-57 GND
IC001-9 GND
IC101-58 3.6
IC001-10 1.4
IC101-59 4.4
IC101-1 GND
IC101-60 4.4
IC101-2 GND
IC101-61 GND
IC101-3 GND
IC101-62 GND
IC101-4 GND
IC101-63 GND
IC101-5 GND
IC101-64 GND
IC101-6 5.1
IC101-65 2.5
IC101-7 2.0
IC101-66 2.3
IC101-8 2.6
IC101-67 1.9
IC101-9 3.6
IC101-68 2.5
IC101-10 3.7
IC101-69 3.2
IC101-11 4.0
IC101-70 GND
IC101-12 1.5
IC101-71 GND
IC101-13 1.5
IC101-72 GND
IC101-14 1.5
IC101-73 2.3
IC101-15 0
IC101-74 0
IC101-16 8.3
IC101-75 2.3
IC101-17 2.5
IC101-76 2.7
IC101-18 2.5
IC101-77 2.3
IC101-19 2.5
IC101-78 2.9
IC101-20 2.25
IC101-79 2.9
IC101-21 GND
IC101-80 GND
IC101-22 GND
IC301-1 0.9
IC101-23 GND
IC301-2 4.9
IC101-24 GND
IC301-3 2.0
IC101-25 2.0
IC301-4 GND
IC101-26 2.4
IC301-5 5.1
IC101-27 2.6
IC301-6 5.1
IC101-28 5,3
IC301-7 0.3
IC101-29 2.8
IC301-8 0.3
IC101-30 0.6
IC301-9 0.7
IC101-31 GND
IC301-10 0
IC101-32 4.9
IC301-11 0
IC101-33 1.0
IC301-12 1.5
IC101-34 1.8
IC301-13 GND
IC101-35 4.8
IC301-14 1.8
IC101-36 3.9
IC301-15 0
IC101-37 4.0
IC301-16 1.5
IC101-38 4.7
IC501-1 GND
IC101-39 GND
IC501-2 15.1
IC101-40 0
— 30 —
SDL
5 IC3401
SCL MTS DECODER
6
13
C1/C2
INT. VIDEO
Q135 Q202
BUFFER BUFFER
IC101
SIGNAL PROCESS
SDA 9
BUS
SCL 10
INTERFACE
4.5MHz
X141 L164
78/79 SOUND
FM 75
SAW X161
TRAP
DET.
FILTER
RF AGC 77
56 VIDEO
VIDEO
11
DET.
ACL
ABL
Y 52 36 V-S
VIDEO H-PULSE
C 54
SW. 37 H-S
33
Q1703 Q1700 Q208 V
49
SYNC
26
SEP. -B
2
VIDEO
C Y H IC501 SIDE PCC AMP.
OUT 5 9
Q1701 VERT. Q461
HORIZ.
Q1702 OUTPUT Q462
12 16 14 DRIVER
Q1705
SIDE
2 T401
3
DELAY PCC
VM H-DRIVE
LINE
COMB 1
TRANS.
FILTER
15 7 SC
Q401
Q402
BLACK 30
H PULSE HORIZ.
HORIZ.
STRETCH
DRIVE
9 OUTPUT
S CLOCK 3.58 44
SHARP
BPA
40
INNER PIN
COLOR CONT
Q471 Q451
DEMOD BRITE
Q462 R L BALANCE
12 17
13 RGB
18
OUT
OSD
Q831 14
19
SW.
RESET HOLD DOWN HOLD DOWN
15
DETECT.
Q722 R Q721
RESET
8
Q712 G Q711
5V
32 5V
IC681
ALWAYS
B9 Q702 B Q701
5V REG.
B9
+16V
Q681
VELOCITY MOD
+135V 12V SW
12V
DRIVE
D627 B4
Q1706,Q1707,Q1708
Q1709,Q1711,Q1712
+12V
Q486
9V
Q635
9V REG.
OVERLOAD
D429
Q627
PROTECT.
D801
12V SW.
5V
Q498
STANDBY MODE
Q693, 5V REG. B6
ALWAYS +5V
Q695
CONTROL
Device/Pin #
Device/Pin # Volts/Mode Device/Pin # Volts/Mode
IC501-3 29.7 IC801-40 0
IC501-4 2.7 IC801-41 0
IC501-5 2.7 IC801-42 0
IC802-1 GND
IC501-6 29.5
IC501-7 2.2 IC802-2 GND
IC501-8 2.7 IC802-3 GND
IC802-4 GND
IC501-9 2.7
IC501-10 11.8 IC802-5 4.9
IC802-6 4.9
POWER ON: POWER OFF:
IC601-1
135.2 86.6 IC802-7 GND
IC802-8 4.9
POWER ON: POWER OFF:
IC601-2
IC1001-1 3.9
32.4 8.5
IC1001-2 0.7
IC601-3 GND
IC1001-3 6.3
IC681-1
POWER ON: POWER OFF:
IC1001-4 6.3
11.6 7.3
(IN)
IC1001-5 6.3
IC681-2 GND
IC1001-6 GND
IC681-3 POWER ON: POWER OFF:
IC1001-7 GND
(OUT) 5.0 5.0
IC1001-8 GND
IC801-1 4.0
IC1001-9 0
IC801-2 3.9
IC1001-10 8.0
IC801-3 4.9
IC1001-11 8.0
IC801-4 9.1
IC1001-12 0.7
IC801-5 0
IC1001-13 3.9
IC801-6 0
IC1001-14 3.9
IC801-7 0
IC1001-15 3.9
IC801-8 0.3
IC1001-16 9.1
IC801-9 0
IC1002-1 5.2
IC801-10 4.9
IC1002-2 5.2
IC801-11 0
IC1002-3 3.9
IC801-12 4.8
IC1002-4 3.9
IC801-13 4.9
IC1002-5 3.9
IC801-14 4.9
IC1002-6 GND
IC801-15 1.9
IC1002-7 GND
IC801-16 0.2
IC1002-8 GND
IC801-17 2.1
IC1002-9 0
IC801-18 GND
IC1002-10 0
IC801-19 2.2
IC1002-11 0
IC801-20 2.0
IC1002-12 6.0
IC801-21 GND
IC1002-13 5.2
IC801-22 4.9
IC1002-14 6.0
IC801-23 0.2
IC1002-15 5.2
IC801-24 0.2
IC1002-16 9.1
IC801-25 4.8
IC1201-1 4.1
IC801-26 0.3
IC1201-2 4.9
POWER ON: POWER OFF:
IC1201-3 4.1
IC801-27
4.9 0
IC1201-4 4.1
IC801-28 2.3
IC1201-5 4.8
IC801-29 2.6
IC1201-6 GND
IC801-30 0
IC1201-7 GND
IC801-31 4.9
IC1201-8 GND
IC801-32 3.6
IC1201-9 9.1
IC801-33 4.9
IC1201-10 9.1
IC801-34 3.7
IC1201-11 9.1
IC801-35 4.8
IC1201-12 0.1
IC801-36 4.9
IC1201-13 0.1
IC801-37 4.9
IC1201-14 0.3
IC801-38 0
IC1201-15 4.1
IC801-39 0
IC1201-16 9.1
NOTE: Waveforms were taken with color bar signal and the controls adjusted for normal picture.
1 SP901
L 10
(L)
4 SPEAKER
R 8
3 IC001 (L) IC101-
F/ V L
39 AUDIO
3 SP902 (R-Output)
F/ V R AMP.
36 37 33 34 38 5
(R) SPEAKER
Q001
(R)
MUTE
Q1211 Q1201
IC1001
F/ V 5 3 2 1
SELECT V/Y + C1/C2
SELECT
S2-SW 11
9
IC1201
H
13 V2 IN
V2/Y2 14 10
12 Y2 IN 2.0V HORIZ
L
MAIN AV 1/2 9 4 15
L 5 C1 IN Q1212 Q1202
C1/C2 4
H 3 C1 IN
F/ V OUT (R)
S1-SW 10
L 2 Y1 IN
V1/Y1 15
H
1 V1 IN F/ V OUT (L) IC501- 2
(Vertical Output)
V1/Y1
K1001
V2/Y2
A/V 1 IN
VIDEO IN
13 12 5 3 2 1
H L L H L H IC1002
AUDIO IN (L)
SELECT
AV 1/2
11 14 9 4 10 15
AUDIO IN (R)
MAIN AV1/2 Y
58 VERT
EXT VIDEO
A/V 2 IN
VIDEO IN
S1/SW
AUDIO IN (L)
Q402- B
DEFLECTION
V YOKE
AUDIO IN (R) (Horizontal Output)
H
Y1 IN Y
K1051
AFC
5 C1 IN C
ABL
1 S1 SW
6/7
S1 IN AV1
H.V.
T402
HORIZ. FOCUS
OUTPUT
SCREEN
TRANS.
HEATER Y2 IN Y 13V HORZ
9
V +B C2 IN C
3
LOW +B S2 SW
S2 IN AV2
8
11
T8801 D445
-B
D482
-R OUT
-G OUT
Q900
-B OUT PIX TUBE
D483
D428
+26V
(16V)
ANODE LEAK
(7V)
DETECT.
R428
g7yam
Volts/Mode Device/Pin #
Device/Pin # Volts/Mode
IC3401-1 4.1 Q202-B 2.7
Q635-B
IC3401-2 4.1 Q202-C GND
IC3401-3 4.1 Q202-E 3.4
Q635-C
IC3401-4 4.1 Q208-B 2.8
IC3401-5 3.6 Q208-C GND
Q635-E
IC3401-6 3.7 Q208-E 3.5
IC3401-7 GND Q401-B 0.3
Q681-B
IC3401-8 4.1 Q401-C 43.6
IC3401-9 4.1 Q401-E GND
IC3401-10 4.1 Q402-B -0.1 Q681-C
IC3401-11 4.1 Q402-C 125.26
Q681-E
IC3401-12 4.9 Q402-E GND
Q688-B
IC3401-13 4.1 Q451-G 16.7
IC3401-14 1.3 Q451-D 109.0
IC3401-15 1.3 Q451-S 15.2 Q688-C
IC3401-16 0 Q461-B 0.6
IC3401-17 GND Q461-C 12.2
Q688-E
IC3401-18 3.2 Q461-E GND
IC3401-19 9.1 Q462-B 12.2
Q693-B
IC3401-20 0 Q462-C GND
IC3401-21 4.1 Q462-E 12.7
Q693-C
IC3401-22 4.1 Q471-G 18.6
IC3401-23 3.7 Q471-D 17.7
Q693-E
IC3401-24 3.9 Q471-S 15.1
IC3401-25 4.1 Q472-B 14.0
Q695-B
IC3401-26 4.1 Q472-C 18.8
Q695-C
IC3401-27 4.1 Q472-E 15.0
IC3401-28 1.9 Q486-B 9.9
Q695-E
IC3401-29 4.1 Q486-C 11.6
IC3401-30 4.1 Q486-E 9.1 Q701-B
IC3401-31 2.0 Q490-B 5.9 Q701-C
IC3401-32 4.1 Q490-C 6.9 Q701-E
IC3401-33 4.1 Q490-E 5.2 Q702-B
IC3401-34 4.1 Q702-C
POWER ON: POWER OFF:
Q601-B
IC3401-35 0 –0.3 0 Q702-E
IC3401-36 4.1 Q711-B
POWER ON: POWER OFF:
Q601-C
IC3401-37 4.1 155.0 169.6 Q711-C
IC3401-38 4.1 Q711-E
Q601-E GND
IC3401-39 4.1 Q712-B
POWER ON: POWER OFF:
Q604-B
IC3401-40 4.1 Q712-C
–0.4 0.6
IC3401-41 4.1 Q712-E
POWER ON: POWER OFF:
IC3401-42 GND Q604-C Q721-B
–0.3 0
IC3401-43 4.1 Q721-C
Q604-E GND
IC3401-44 4.1 Q721-E
POWER ON: POWER OFF:
IC3401-45 4.2 Q722-B
Q605-B
13.1 1.4
IC3401-46 GND Q722-C
POWER ON: POWER OFF:
IC3401-47 4.1 Q605-C Q722-E
–0.4 0.6
IC3401-48 4.1 Q751-B
POWER ON: POWER OFF:
Q751-C
POWER ON: POWER OFF: Q605-E
Q001-B 13.0 2.0
0 0.7 Q751-E
POWER ON: POWER OFF:
Q831-B
POWER ON: POWER OFF: Q627-B
Q001-C 11.1 7.3
Q831-C
7.7 0
POWER ON: POWER OFF: Q831-E
Q001-E GND
Q627-C
11.6 1.0
Q1201-B
Q135-B 2.3
Q135-C 5.2 POWER ON: POWER OFF: Q1201-C
Q627-E
11.9 7.3 Q1201-E
Q135-E 1.7
Q1202-B
Q1202-C
Q1202-E
— 31 —

WAVEFORMS

IC101- IC101- IC101-
17 18 19
(G-Output) (B-Output) (Selected Video)
2.0V HORIZ 2.0V HORIZ 1.0V HORIZ
IC501- 5 Q202-E (TP16) Q401- B
(Inverting Input) (Internal Video) (Horizontal Drive)
0.6V VERT 1.0V HORIZ 0.7V HORZ
T402- 9
Q601- B
(Heater)
(Power Switching)
2.5V 50KHz 28V HORIZ
Volts/Mode Device/Pin # Volts/Mode
POWER ON: POWER OFF: Q1211-B 1.6
4.2 1.4 Q1211-C 4.8
Q1211-E 0.9
POWER ON: POWER OFF:
31.1 9.8 Q1212-B 4.1
Q1212-C 9.1
POWER ON: POWER OFF:
Q1212-E 3.5
4.2 1.4
Q1700-B 3.1
POWER ON: POWER OFF:
0.7 0 Q1700-C GND
Q1700-E 3.7
POWER ON: POWER OFF:
Q1701-B 7.9
0 7.3
Q1701-C 2.5
GND
Q1701-E 8.6
POWER ON: POWER OFF:
Q1702-B 2.5
11.6 1.0
Q1702-C 9.1
POWER ON: POWER OFF:
Q1702-E 2.2
0 0
Q1703-B 0
POWER ON: POWER OFF:
Q1703-C 0.5
11.5 1.0
Q1703-E GND
POWER ON: POWER OFF: Q1705-B 1.4
0.5 6.2
Q1705-C 7.1
POWER ON: POWER OFF: Q1705-E 0.8
30.9 8.9
Q1706-B 0.7
POWER ON: POWER OFF: Q1706-C 6.0
0.4 5.7
Q1706-E 0.1
POWER ON: POWER OFF: Q1707-B 6.0
30.9 9.6 Q1707-C 8.8
GND Q1707-E 6.0
Q1708-B 6.0
POWER ON: POWER OFF:
31.0 9.8 Q1708-C GND
Q1708-E 6.0
12.5
169.8 Q1709-B 128.4
11.9 Q1709-C 57.5
Q1709-E 128.7
2.5
Q1711-B 0.8
11.9
2.3 Q1711-C 65.5
12.5 Q1711-E 0.3
Q1712-B 0.2
166.5
12.0 Q1712-C 2.9
2.5 Q1712-E GND
12.0
2.3
12.5
167.4
12.0
2.5
12.0
2.3
4.7
9.4
4.0
4.9
4.9
4.9
1.5
5.0
0.9
4.1
9.1
3.5
— 32 —
52