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SERVICE MANUAL
FLAT COLOUR TELEVISION
AV-21BX16Y290A04665
/L
BASIC CHASSIS
CW3
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-29
COPYRIGHT © 2006 Victor Company of Japan, Limited
No.YA465
2006/9

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SPECIFICATION
Items
Dimensions (W × H × D)
Mass
59.8 cm × 47.6 cm × 47.7 cm
22.0 kg
Contents
TV RF System
Colour System
B, G, I, D, K, M
PAL / SECAM / NTSC 3.58 / NTSC 4.43
Stereo System
PB STREO
Teletext System
Receiving
Frequency
VHF Low 46.25MHz - 140.25MHz (AS0 - S6)
VHF High 147.25MHz - 423.25MHz (S7 - S36)
---
UHF 431.25MHz - 863.25MHz (S37 - C57)
CATV Mid (X - Z+2, S1 - S10) / Super (S11 - S20) / Hyper (S21 - S41) bands
Intermediate
Frequency
VIF 38.0MHz (B, G, I, D, K, M)
SIF 32.26 MHz (5.74 MHz: B), 32.15MHz (5.85 MHz: G), 31.45 MHz (6.55 MHz: I)
31.75 MHz (6.5 MHz: D), 32.15MHz (5.85 MHz: K), 33.5MHz (4.5MHz : M)
Colour Sub
Carrier
PAL 4.43 MHz
SECAM 4.40625 MHz / 4.25 MHz
NTSC 3.58 MHz / 4.43 MHz
Power Input
Power Consumption
AC110 V - AC240 V, 50 Hz/60 Hz
89W(Max)64W(Avg)
Picture Tube
High Voltage
Speaker
Audio Power Output
Visible size : 52.1 cm, Measured diagonally
26.5 kV ±1.5 kV (at zero beam current)
5 cm × 9 cm, oval type × 2
3 W + 3 W (Rated power output)
H: 41.6 cm × V: 31.5 cm
Aerial Input
75 unbalanced, coaxial
Video / Audio
Input-1/2/3
Component Video RCA pin jack × 3
[VIDEO-2] Y:1V(p-p), positive (negative sync), 75
Cb/Cr:0.7V(p-p), 75
S-Video Mini-DIN 4 pin × 1
[VIDEO-1] Y: 1V(p-p), positive (negative sync provided), 75
C: 0.286V(p-p) (Burst signal), 75
Video 1V(p-p), negative sync, 75, RCA pin jack × 3
Audio 500mV(rms) (-4dBs), high impedance, RCA pin jack × 6
Video / Audio
Output
Video 1V(p-p), 75, RCA pin jack × 1
Audio 500mV(rms)(-4dBs), Low impedance, RCA pin jack × 2
Headphone jack
3.5 mm stereo mini jack × 1
Remote Control Unit
RM-C1286 (UM-3/AA/R6 dry cell battery × 2)
Design and specifications subject to change without notice.
1-2 (No.YA465)

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SECTION 1
PRECAUTION
1.1 SAFETY PRECAUTIONS
(1) The design of this product contains special hardware,
many circuits and components specially for safety
purposes. For continued protection, no changes should be
made to the original design unless authorized in writing by
the manufacturer. Replacement parts must be identical to
those used in the original circuits. Service should be
performed by qualified personnel only.
(2) Alterations of the design or circuitry of the products should
not be made. Any design alterations or additions will void
the manufacturer's warranty and will further relieve the
manufacturer of responsibility for personal injury or
property damage resulting therefrom.
(3) Many electrical and mechanical parts in the products have
special safety-related characteristics. These
characteristics are often not evident from visual inspection
nor can the protection afforded by them necessarily be
obtained by using replacement components rated for
higher voltage, wattage, etc. Replacement parts which
have these special safety characteristics are identified in
the parts list of Service manual. Electrical components
having such features are identified by shading on the
schematics and by ( ) on the parts list in Service
manual. The use of a substitute replacement which does
not have the same safety characteristics as the
recommended replacement part shown in the parts list of
Service manual may cause shock, fire, or other hazards.
(4) Don't short between the LIVE side ground and
ISOLATED (NEUTRAL) side ground or EARTH side
ground when repairing.
Some model's power circuit is partly different in the GND.
The difference of the GND is shown by the LIVE : ( ) side
GND, the ISOLATED (NEUTRAL) : ( ) side GND and
EARTH : ( ) side GND.
Don't short between the LIVE side GND and ISOLATED
(NEUTRAL) side GND or EARTH side GND and never
measure the LIVE side GND and ISOLATED (NEUTRAL)
side GND or EARTH side GND at the same time with a
measuring apparatus (oscilloscope etc.). If above note will
not be kept, a fuse or any parts will be broken.
(5) If any repair has been made to the chassis, it is
recommended that the B1 setting should be checked or
adjusted (See B1 VOLTAGE).
(6) The high voltage applied to the picture tube must conform
with that specified in Service manual. Excessive high
voltage can cause an increase in X-Ray emission, arcing
and possible component damage, therefore operation
under excessive high voltage conditions should be kept to
a minimum, or should be prevented. If severe arcing
occurs, remove the AC power immediately and determine
the cause by visual inspection (incorrect installation,
cracked or melted high voltage harness, poor soldering,
etc.). To maintain the proper minimum level of soft X-Ray
emission, components in the high voltage circuitry
including the picture tube must be the exact replacements
or alternatives approved by the manufacturer of the
complete product.
(7) Do not check high voltage by drawing an arc. Use a high
voltage meter or a high voltage probe with a VTVM.
Discharge the picture tube before attempting meter
connection, by connecting a clip lead to the ground frame
and connecting the other end of the lead through a 10k
2W resistor to the anode button.
(8) When service is required, observe the original lead dress.
Extra precaution should be given to assure correct lead
dress in the high voltage circuit area. Where a short circuit
has occurred, those components that indicate evidence of
overheating should be replaced. Always use the
manufacturer's replacement components.
(9) Isolation Check (Safety for Electrical Shock Hazard)
After re-assembling the product, always perform an
isolation check on the exposed metal parts of the cabinet
(antenna terminals, video/audio input and output terminals,
Control knobs, metal cabinet, screw heads, earphone jack,
control shafts, etc.) to be sure the product is safe to operate
without danger of electrical shock.
a) Dielectric Strength Test
The isolation between the AC primary circuit and all metal
parts exposed to the user, particularly any exposed metal
part having a return path to the chassis should withstand a
voltage of 3000V AC (r.m.s.) for a period of one second. (.
. . . Withstand a voltage of 1100V AC (r.m.s.) to an
appliance rated up to 120V, and 3000V AC (r.m.s.) to an
appliance rated 200V or more, for a period of one second.)
This method of test requires a test equipment not generally
found in the service trade.
b) Leakage Current Check
Plug the AC line cord directly into the AC outlet (do not use
a line isolation transformer during this check.). Using a
"Leakage Current Tester", measure the leakage current
from each exposed metal part of the cabinet, particularly
any exposed metal part having a return path to the chassis,
to a known good earth ground (water pipe, etc.). Any
leakage current must not exceed 0.5mA AC (r.m.s.).
However, in tropical area, this must not exceed 0.2mA AC
(r.m.s.).
Alternate Check Method
Plug the AC line cord directly into the AC outlet (do not
use a line isolation transformer during this check.). Use
an AC voltmeter having 1000per volt or more
sensitivity in the following manner. Connect a 1500
10W resistor paralleled by a 0.15µF AC-type capacitor
between an exposed metal part and a known good earth
ground (water pipe, etc.). Measure the AC voltage
across the resistor with the AC voltmeter. Move the
resistor connection to each exposed metal part,
particularly any exposed metal part having a return path
to the chassis, and measure the AC voltage across the
resistor. Now, reverse the plug in the AC outlet and
repeat each measurement. Any voltage measured must
not exceed 0.75V AC (r.m.s.). This corresponds to
0.5mA AC (r.m.s.).
However, in tropical area, this must not exceed 0.3V AC
(r.m.s.). This corresponds to 0.2mA AC (r.m.s.).
AC VOLTMETER
(HAVING 1000 /V,
OR MORE SENSITIVITY)
0.15 F AC-TYPE
1500 10W
GOOD EARTH GROUND
PLACE THIS PROBE
ON EACH EXPOSED
METAL PART
(No.YA465)1-3

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SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
2.1 FEATURES
DVD PICTURE MODE
This function can enhance the picture quality of DVD. The
screen can be made sharp or soft by this setting.
AUTO SIGNAL DETECT
When input DVD signal to VIDEO-2, detect the input signal
and change the input mode to VIDEO-2 automatically.
CINEMA SURROUND
This function can enjoy an enhanced sound for wider
audience.
PICTURE MODE
This function can adjust the picture settings automatically.
There are BRIGHT, STANDARD and SOFT in the PICTURE
MODE.
RETURN +
This function can set a channel frequently view to the Return
Channel and you can view that channel at any time with one-
touch.
ECO MODE
This function can adjust TV screen contrast according to the
brightness of your room.
1-4 (No.YA465)

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2.2 TECHNINAL INFORMATION
2.2.1 MAIN MI-COM (CPU) PIN FUNCTION
Pin
No.
Pin name
1 VssP2
2 VssC4
3 V1.8C4
4 V3.3A3
5 VrefP_Sdac
6 VrefN_Sdac
7 VrefP_Sdac
8 VrefN_Sdac
9 VrefP_Sdac
10 XtalIn
11 XtalOut
12 VssA1
13 NECK
14 CONT
15 V5P1
16 Ph2
17 Ph1
18 Gnd1
19 SecPll
20 Dec8G
21 EW
22 VDRB-
23 VDRA+
24 Vif1
25 Vif2
26 Vsc
27 Iref
28 GndIF
29 Sif1
30 Sif2
31 AGC
32 EHT
33 Ssif/RefIn/Avl/
RefOut
34 L3
35 R3
36 L-OUT
37 R-OUT
38 DecsDem
39 QssO/AmO/
AudeEm
40 Gnd2
41 PllIf
42 SifAgc
43 IfVo/FmRo/DvbO
44 NC
45 V8AudioSwitches
46 AgcSsif
47 V5P2
48 V-OUT
49 L1
50 R1
51 V3
52 C4
53 Audio2InL
54 Audio2InR
55 V2/Y
56 L2
57 R2
58 Y3/Cvbs
59 C1
60 AudioLsL
61 AudioLsR
62 HP-L
63 HP-R
64 CVBSO/PIP
I/O
Function
Pin
No.
Pin name
- GND
65 SVM
- GND
66 FbiSo
I 1.8V (Digital)
67 Hout
I 3.3V
68 VssComb
I 3.3V (Positive)
69 V5Comb
- GND
70 Vin/R2/Pr
I 3.3V (Negative)
71 Uin/B2/Pb
- GND
72 Yin/G2/Y
I 3.3V (Positive)
73 Ysync
I 24.576MHz for system clock
74 Yout
O 24.576MHz for system clock
75 Uout/INSSW2
- GND
76 NC
I V-guard input/ I/O switch
77 INSSW3
I 1.8V regulator control
78 R3/Pr
I +5V
79 G3/Y
- Phase-2 filter
80 B3/Pb
- Phase-1 filter
81 Gnd3
- GND
82 V5P3
- SECAM PLL decoupling
83 BCL
- Bandgap decoupling
84 BLKIN
O East-West drive output
85 Rout
O Vertical drive B output
86 Gout
O Vertical drive A output
87 Bout
I Video IF input 1
88 V3.3A1
I Video IF input 2
89 RefAdN
- Vertical sawtooth capacitor
90 V3.3RefAdP
I Reference current input
91 RefAd
- GND
92 GndA
I Sound IF input 1
93 V1.8A
I Sound IF input 2
94 V3.3A2
O Tuner AGC output
95 VssADC
I EHT/overvoltage protection input
96 V1.8ADC
O Automatic Volume Levelling/ sound IF input / subcar- 97 REMOTE
rier reference output / external reference signal input
for I signalmixer for DVB operation
I Audio-L3 input (left signal)
98 PW_LED
I Audio-R3 input (right signal)
99 PW_LED
O Audio L output
100 V1.8C2
O Audio R output
101 VssC2
- Decoupling sound demodulator
102 TIMER
O QSS intercarrier output / AM output / deemphasis / 103 TIMER
(front-end audio out)
- GND
104 VER_PROTECT
- IF-PLL loop filter
105 S_REDUCE
- AGC sound IF
106 P00/I2SDI1
O Not used
107 POWER
O Not used
108 SCL1
I 8V
109 SDA1
- AGC capacitor second sound IF
110 V3.3P
I 5V
111 ROTATION
O Video output
112 3.58/OTHER
I Audio-L1 input
113 A_MUTE
I Audio-R1 input
114 4.5/OTHER
I Video V3 input
115 PROT
I Not used
116 ECO_IN
I Not used
117 V1.8C1
I Not used
118 DecV1V8
I Video V2 input
119 KEY_IN
I Audio L2 input (Left signal)
120 VDO-DET
I Audio R2 input (right signal)
121 VSSC1+P1
I S-Video Y1 input
122 S_V_DET
I S-Video C1 input
123 P25/PWM4
O Audio L output for audio power amplifier
124 V1.8C3
O Audio R output for audio power amplifier
125 VssC3
O Not used
126 P12/Int2
O Not used
127 SDA0
O CVBS / PIP output
128 SCL0
I/O Function
O Not used
I Flyback input/sandcastle output
O Horizontal output
- GND
I 5V
I PIP R input
I PIP B input
I PIP G input
I Not used
O Not used
I YUV insertion input
O Not used
I YUV insertion input
I Component PR input (Video-2)
I Component Y input (Video-2)
I Component PB input (Video-2)
- GND
I 5V
I Beam current limiter input
I Black current input
O R output
O G output
O B output
I 3.3V
- GND
I 3.3V (Positive)
I 3.3/2V
- GND
I 1.8V
I 3.3V
- GND
I 1.8V
I Remote control
I POWER LED control
I POWER LED control
I 1.8V
- GND
- Not used
- Not used
O X-ray protect
O Sound control
O Not used
O SUB POWER control
I I2C bus clock
I/O I2C bus data
I 3.3V
O Rotation
O NTSC 3.58 detection
O Audio muting
O NTSC 4.43 detection
I Protect
I ECO sensor level detection
I 1.8V (Digital)
I 1.8V
I Key scan data
I Video DET input
- Digital GND
I S-Video DET input
O GTVA_reset
I 1.8V (Digital)
- GND
I External interrupt
I/O I2C bus data (for memory)
I I2C bus clock (for memory)
(No.YA465)1-5