JVC AV-21L91(-BK), AV-25L91(-BK), AV-29L91(-BK) Schematics
AV-21L91
AV-25L91
AV-29L91
SCHEMATIC DIAGRAMS
COLOUR TELEVISION
BASIC CHASSIS
CH
DISPLAY
CHANNEL VOLUME
SYSTEM
COLOUR
SOUND MUTING
TV/VIDEO
I/II
PICTURE MODE
CHANNEL SCAN
RETURN
ECO SENSOR
RM-C353 REMOTE CONTROL UNIT
POWER
MENU
123
456
7809
OFF TIMER
AV-21L91
AV-25L91
AV-29L91
(-BK)
(-BK)
(-BK)
CD-ROM No. SML200112
POWER
DISPLAY
MENU
CHANNEL VOLUME
SYSTEM
COLOUR
SOUND MUTING
TV/VIDEO
123
I/II
456
PICTURE MODE
7809
CHANNEL SCAN
RETURN
-/--
ECO SENSOR
RM-C353 REMOTE CONTROL UNIT
-/--
OFF TIMER
[AV-21L91
(-BK)
, AV-25L91
RM-C353-1CRM-C353-1C
(-BK)
] [AV-29L91
COPYRIGHT © 2001 VICTOR COMPANY OF JAPAN, LTD.
(-BK)
]
No. 51898
Nov. 2001
AV-21L91 (-BK)
AV-25L91 (-BK)
AV-21L91
AV-25L91
AV-29L91
AV-29L91 (-BK)
q
NOTE ON USING CIRCUIT DIAGRAMS
STANDARD CIRCUIT DIAGRAM
1. SAFETY
The components identified by the symbol and shading are
critical for safety. For continued safety replace safety critical
components only with manufactures recommended parts.
2. SPECIFIED VOLTAGE AND WAVEFORM VALUES
The voltage and waveform values have been measured under the
following conditions.
(1) Input signal : Colour bar signal
(2)
Setting positions of each knob/button and variable resistor
: Original setting position when
shipped
(3) Internal resistance of tester : DC 20kØ/V
(4) Oscilloscope sweeping time : H ⇒ 20µS/div
:V ⇒ 5mS/div
: Others ⇒ Sweeping time is
specified.
(5) Voltage values : All DC voltage values
9Since the voltage values of signal circuit vary to some extent ac-
cording to adjustments, use them as reference values.
3. INDICATION OF PARTS SYMBOL [EXAMPLE]
• In the PW board : R1209
→
R209
Type
•
No indication : Ceramic capacitor
MY : Mylar capacitor
MM : Metalized mylar capacitor
PP : Polypropylene capacitor
MPP : Metalized polypropylene capacitor
MF : Metalized film capacitor
TF : Thin film capacitor
BP : Bipolar electrolytic capacitor
TAN : Tantalum capacitor
(3) Coils
No unit : [µH]
Others : As specified
(4) Power Supply
:B1
: B2(12V)
:9V
:5V
9Respective voltage values are indicated
(5) Test point
: Test point
: Only test point display
4. INDICATIONS ON THE CIRCUIT DIAGRAM
(1) Resistors
Resistance value
•
No unit : [Ø]
k:[kØ]
M:[MØ]
Rated allowable power
•
No indication : 1/16 [W]
Others : As specified
Type
•
No indication : Carbon resistor
OMR : Oxide metal film resistor
MFR : Metal film resistor
MPR : Metal plate resistor
UNFR : Non-Flammable resistor
FR : Fusible resistor
9Composition resistor 1/2 [W] is specified as 1/2S or Comp.
(2) Capacitors
Capacitance value
•
1 or higher : [pF]
less than 1 : [µF]
Withstand voltage
•
No indication : DC50[V]
AC indicated : AC withstand voltage [V]
Others : DC withstand voltage [V]
9 Electrolytic Capacitors
47/50[Example] : Capacitance value [µF]/withstand voltage[V]
(6) Connecting method
: Connector
: Wrapping or soldering
: Receptacle
(7) Ground symbol
: LIVE side ground
: ISOLATED(NEUTRAL) side ground
: EARTH ground
: DIGITAL ground
5. NOTE FOR REPAIRING SERVICE
This model’s power circuit is partly different in the GND. The difference
of the GND is shown by the LIVE : ( ) side GND and the
ISOLATED(NEUTRAL) : ( ) side GND. Therefore, care must be taken
for the following points.
(1) Do not touch the LIVE side GND or the LIVE side GND and the
ISOLATED(NEUTRAL) side GND simultaneously. If the above caution is not respected, an electric shock may be caused. Therefore,
make sure that the power cord is surely removed from the receptacle when, for example, the chassis is pulled out.
(2) Do not short between the LIVE side GND and ISOLATED(NEUTRAL)
side GND or never measure with a measuring apparatus ( oscilloscope, etc.) the LIVE side GND and ISOLATED(NEUTRAL) side
GND at the same time. If the above precaution is not respected , a
fuse or any parts will be broken.
Since the circuit diagram is a standard one, the circuit and cir-
•
cuit constants may be subject to change for improvement without any notice.
Nov. 2001 No. 51898
AV-21L91
AV-25L91
AV-29L91
CONTENTS
SEMICONDUCTOR SHAPES ................................................................................................................................. 2-2
BLOCK DIAGRAM [AV-21L91-BK, AV-25L91-BK].................................................................................. 2-3
CIRCUIT DIAGRAMS [AV-21L91-BK, AV-25L91-BK]
MAIN PWB CIRCUIT DIAGRAM (1/2) [AV-21L91-BK, AV-25L91-BK] ...................................................................... 2-5
MAIN (2/2) AND CRT SOCKET PWB CIRCUIT DIAGRAMS [AV-21L91-BK, AV-25L91-BK] .............................. 2-7
PATTERN DIAGRAMS[AV-21L91-BK, AV-25L91-BK]
MAIN PWB PATTERN [AV-21L91-BK, AV-25L91-BK] ................................................................................................. 2-9
CRT SOCKET PWB PATTERN [AV-21L91-BK, AV-25L91-BK]................................................................................ 2-11
BLOCK DIAGRAM [AV-29L91-BK] ................................................................................................................... 2-13
CIRCUIT DIAGRAMS [AV-29L91-BK]
MAIN PWB CIRCUIT DIAGRAM (1/2) [AV-29L91-BK]............................................................................................... 2-15
MAIN PWB CIRCUIT DIAGRAM (2/2) [AV-29L91-BK]............................................................................................... 2-17
CRT SOCKET PWB CIRCUIT DIAGRAM [AV-29L91-BK] ........................................................................................ 2-19
FRONT CONTROL PWB CIRCUIT DIAGRAM [AV-29L91-BK] ................................................................................ 2-21
PATTERN DIAGRAMS [AV-29L91-BK]
MAIN PWB PATTERN [AV-29L91-BK] ..........................................................................................................................2-23
CRT SOCKET PWB PATTERN [AV-29L91-BK] .......................................................................................................... 2-25
FRONT CONTROL PWB PATTERN [AV-29L91-BK] .................................................................................................. 2-26
SEMICONDUCTOR SHAPES
TRANSISTOR
E
C
B
ECB
IC
OUT
E
IN
IN E OUT
CHIP IC
N
N
EC
B
(G)(D)(S)
ECB
1N
TOP VIEW
1
ECB
1N
TOP VIEWBOTTOM VIEW FRONT VIEW
CHIP TR
C
B
E
TOP VIEWBOTTOM VIEW FRONT VIEW
1N
N
1
N
2-2 No.51898
N
BLOCK DIAGRAM [AV-21L91-BK,AV-25L91-BK]
AV-21L91
AV-25L91
AV-21L91
AV-25L91
J801
VIDEO-1
INPUT
J802,J803
COMPONENT
(VIDEO-2)
INPUT
J804
OUTPUT
J771-J773
FRONT IN
(VIDEO-3)
TU001
TUNER
VIDEO
AUDIO L/MONO
AUDIO R
V/Y
CB
CR
AUDIO L/MONO
AUDIO R
VIDEO OUT
AUDIO L
AUDIO R
VIDEO
AUDIO L/MONO
AUDIO R
SCL
SDA
IF
37
36
35
43
44
42
19
MAIN PWB
28
SF101
FILTER
SF102
FILTER
29,30
SCL
SDA
7
V1-V
8
V1-L
10
V1-R
3
V2-Y
2
V2-L
4
V2-R
Vout2
Lout2
Rout2
V3-V
L3-L
L3-R
Yin1
COUT1
YOUT1
IC801
VIDEO SW
MTV-V
MTV-R
MTV-L
Rout1
Vout1
Lout1
25
27
CB
CR
13
15
14
26
24
23
Q108
BUF
Q111
BUF
IC702
EEPROM
CF104,105
5.5 TRAP
6.5 TRAP
5,6
CF103
6.0 TRAP
CF106
TRAP
29
24
2,3
62,63
43
42
47
48
46
23
SIF IN1
SIF IN2
IF IN1
IF IN2
IC701
V/C DEF.
PROCESSOR
SCL,SDA
SCL1
SDA1
CIN
CVBS/YIN
Y
U
V
7
ROUT
GOUT
BOUT
QSS OUT
VDRB(-)
VDRA(+)
HOUT
IF VOUT
10
64
Q104
BUF
Q109
BUF
51
52
53
35
21,22
33
38
R
G
B
SCL
SDA
IC650
26,27
30,31
7
12
BUF
Q150
Lout1
Rout1
40
41
IC665
FILTER
2
IC601
MULTI SOUND
PROCESSOR
L, R
L_VOL, R_VOL
5
2
AUDIO AMP
CRT SOCKET PWB
IC351
VIDEO AMP
J770
HEADPHONE
JACK
SP
L
SP
R
V01
AC IN
VOL+
VOL- CH+ CH- MENU
REMOCON
RECEIVER
S901
POWER SW
POWER
LED
F901
No.51898 2-3 No.51898
KEY_IN
REMOTE, LED
D901
RECT
IC901
POWER
REG
T901
SW
TRANSF.
PC901
VOLTAGE
FEEDBACK
IC951
ERROR
AMP
2-4
IC972
3.3V REG
IC974
REG
L951
IC401
VERT OUT
Q522
H. OUT
3.3V_STB
5V
8V
9V
32V
B1
T551
FBT
FOCUS1
SCREEN
EHV
V
DY01
DEF YOKE
H
CIRCUIT DIAGRAMS [AV-21L91-BK,AV-25L91-BK]
MAIN PWB CIRCUIT DIAGRAM(1/2)[AV-21L91-BK,AV25L91-BK]
TO
SPEAKER
0V
0V
5.0V
FRONT INPUT
(
)
VIDEO-3
QNN0349-001
VIDEO-1
INPUT
COMPONENT
(
VIDEO-2
INPUT
OUTPUT
)
75
MA3120/M/-X
MA3120/M/-X
4.4V
9.0V
5.0V
AV-21L91
AV-21L91
AV-25L91 AV-25L91
8.3V
7.4V
0V
3.7V
3.7V
3.7V
3.7V
3.7V
0.1V
4.9V
4.3V
4.9V
4.4V
4.9V
5.3V
4.3V
4.4V
7.0V
5.9V
4.9V
4.3V
4.3V
5.7V
4.9V
2.6V
2.1V
4.4V
4.9V
4.3V
9.0V
9.0V
4.4V
5.0V
4.2V
4.2V
4.3V
4.3V
1.7V
1.9V
1.7V
4.1V
4.2V
3.4V
4.2V
5.1V
2.3V
3.0V
2.4V
2.9V
1.9V
4.2V
1.9V
2.6V
2.6V
3.7V
0V
5.0V
1.5V
0.2
V
5.0V
0V
0V0V
2.9V
2.9V
2.4V
2.4V
2.7V
4.8V
5.0
5.0V
V
3.3V
5.0V
2.7V
3.3V
5.0V
5.0V
1.7V
1.9V
5.0V
TO CRT SOCKET
3.3V
3.3V
3.3V
5.0V
5.0
5.0
V
V
0V
0V
0V
3.3V
1.5V
1.6V
3.3V
1.8V
1.6V
3.3V
3.3V
3.3V
5.0
0V
2.8
V
V
PWB CN10T
3.3V
0V
6.3V
3.1V
2.5V
2.6
2.4 4.2 1.9
V
VVV
2.6V
5.1V
2.7V
2.7V
2.8V
3.8V
0V
8.3V
4.9V
3.0V
0V
4.0V
9.0V
0V
4.3V
9.0V
3.7V0V3.3V
8.3V
1.5V
3.8V
1.9V
2.0V
0.7V
0.8V
1.9V
3.6V
0V
3.9V
3.0V
4.9V
4.9V
4.3V
3.5V
3.8V
4.6V
1.9
1.9
V
V
4.3V
0.6
1.4V
V
2.0V
2.6V
TDA9386N12S0454
2.1V
0
4.0V
V
4.3V
IC701
IC701
0V
3.0V
1.0Vp-p(V
1.0Vp-p(V
4.3V
3.9V
21
)
22
)
7
IC801
)
1.2Vp-p(H
27
IC801 IC801
)
2.1Vp-p(H
MAIN PWB ASS’Y(1/2
IC801
2.2Vp-p(H
2.2Vp-p(H
23
)
37
)
)
SCH-1051A-BK(AV-21L91-BK
SCH-1052A-BK(AV-25L91-BK
DIFFERENCE LIST(PARTS
R748 R749
SCH-1051A-BK
SCH-1052A-BK
44.7M
2.2M
No.51898 No.51898
)
4.7M
2.2M
33
IC701
)
2.8Vp-p(H
5.0V
15.3V
22.8
0V
0V
V
-0.4V
0V
0V
-0.3V
0V
4.6V
-1.0V
5.0V
)
)
0.6V
0V
0V
0.6V
0.1V
0
11.5V
V
0V
11.4V
24V
9.0V
2.2V
1.5V
0V
0V
33.8V
0V
4.6V
8.6V
1.9V
5.0V
1.7V
5.0V
5.0V
0V
0V
3.0V
0V
3.0V
IC701
0.55Vp-p(H
IC701
3.4Vp-p(H
IC701
3.6Vp-p(H
43
)
51
)
53
)
IC701
1.04Vp-p(H
IC701
1.6Vp-p(H
IC701
2.6Vp-p(H
42
)
47
)
52
)
NOTE
: OPTION(NON MOUNT
X
: BUS WIRE
BW
: NRSA63J-0R0X
0
: 2SC2412K/QR/-X
1
: 2SA1037AK/QR/-X
2
: MA111-X
3
: DTC124EKA-X
5
: 2SC1740S/QR/-T
7
)
2-5 2-6
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