JVC AV-21BX16-L Service Manual

SCHEMATIC DIAGRAMS

FLAT COLOUR TELEVISION

AV-21BX16/L

CD-ROM No.SML200609

BASIC CHASSIS

CW3

COPYRIGHT © 2006 Victor Company of Japan, Limited.

No.YA465

2006/9

SERVICE MANUAL

FLAT COLOUR TELEVISION

YA46520069

AV-21BX16/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

SPECIFICATION

Items Contents

Dimensions (W × H × D) 59.8 cm × 47.6 cm × 47.7 cm

Mass 22.0 kg

TV RF System B, G, I, D, K, M

Colour System PAL / SECAM / NTSC 3.58 / NTSC 4.43

Stereo System PB STREO

Teletext System ---

Receiving
Frequency

Intermediate
Frequency

Colour Sub
Carrier

Power Input

Power Consumption 89W(Max)64W(Avg)

Picture Tube Visible size : 52.1 cm, Measured diagonally H: 41.6 cm × V: 31.5 cm

High Voltage 26.5 kV ±1.5 kV (at zero beam current)

Speaker 5 cm × 9 cm, oval type × 2

Audio Power Output 3 W + 3 W (Rated power output)

Aerial Input 75 Ω unbalanced, coaxial

Video / Audio
Input-1/2/3

Video / Audio
Output

Headphone jack 3.5 mm stereo mini jack × 1
Remote Control Unit RM-C1286 (UM-3/AA/R6 dry cell battery × 2)

Component Video

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

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)

PAL 4.43 MHz

SECAM 4.40625 MHz / 4.25 MHz

NTSC 3.58 MHz / 4.43 MHz

AC110 V - AC240 V, 50 Hz/60 Hz

RCA pin jack × 3

[VIDEO-2]

S-Video

[VIDEO-1]

Y:1V(p-p), positive (negative sync), 75Ω
Cb/Cr:0.7V(p-p), 75Ω

Mini-DIN 4 pin × 1
Y: 1V(p-p), positive (negative sync provided), 75Ω

C: 0.286V(p-p) (Burst signal), 75Ω
Video 1V(p-p), negative sync, 75Ω, RCA pin jack × 3
Audio 500mV(rms) (-4dBs), high impedance, RCA pin jack × 6
Video 1V(p-p), 75Ω, RCA pin jack × 1
Audio 500mV(rms)(-4dBs), Low impedance, RCA pin jack × 2

Design and specifications subject to change without notice.

1-2 (No.YA465)

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 10kΩ

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 1000Ω per volt or more
sensitivity in the following manner. Connect a 1500Ω
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

PLACE THIS PROBE

1500 10W

GOOD EARTH GROUND

ON EACH EXPOSED
ME TAL PAR T

(No.YA465)1-3

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 one­touch.

ECO MODE

This function can adjust TV screen contrast according to the
brightness of your room.

1-4 (No.YA465)

2.2 TECHNINAL INFORMATION

2.2.1 MAIN MI-COM (CPU) PIN FUNCTION

Pin

Pin name I/O Function

No.

1 VssP2 - GND 65 SVM O Not used
2 VssC4 - GND 66 FbiSo I Flyback input/sandcastle output
3 V1.8C4 I 1.8V (Digital) 67 Hout O Horizontal output
4 V3.3A3 I 3.3V 68 VssComb - GND
5 VrefP_Sdac I 3.3V (Positive) 69 V5Comb I 5V
6 VrefN_Sdac - GND 70 Vin/R2/Pr I PIP R input
7 VrefP_Sdac I 3.3V (Negative) 71 Uin/B2/Pb I PIP B input
8 VrefN_Sdac - GND 72 Yin/G2/Y I PIP G input

9 VrefP_Sdac I 3.3V (Positive) 73 Ysync I Not used
10 XtalIn I 24.576MHz for system clock 74 Yout O Not used
11 XtalOut O 24.576MHz for system clock 75 Uout/INSSW2 I YUV insertion input
12 VssA1 - GND 76 NC O Not used
13 NECK I V-guard input/ I/O switch 77 INSSW3 I YUV insertion input
14 CONT I 1.8V regulator control 78 R3/Pr I Component PR input (Video-2)
15 V5P1 I +5V 79 G3/Y I Component Y input (Video-2)
16 Ph2 - Phase-2 filter 80 B3/Pb I Component PB input (Video-2)
17 Ph1 - Phase-1 filter 81 Gnd3 - GND
18 Gnd1 - GND 82 V5P3 I 5V
19 SecPll - SECAM PLL decoupling 83 BCL I Beam current limiter input
20 Dec8G - Bandgap decoupling 84 BLKIN I Black current input
21 EW O East-West drive output 85 Rout O R output
22 VDRB- O Vertical drive B output 86 Gout O G output
23 VDRA+ O Vertical drive A output 87 Bout O B output
24 Vif1 I Video IF input 1 88 V3.3A1 I 3.3V
25 Vif2 I Video IF input 2 89 RefAdN - GND
26 Vsc - Vertical sawtooth capacitor 90 V3.3RefAdP I 3.3V (Positive)
27 Iref I Reference current input 91 RefAd I 3.3/2V
28 GndIF - GND 92 GndA - GND
29 Sif1 I Sound IF input 1 93 V1.8A I 1.8V
30 Sif2 I Sound IF input 2 94 V3.3A2 I 3.3V
31 AGC O Tuner AGC output 95 VssADC - GND
32 EHT I EHT/overvoltage protection input 96 V1.8ADC I 1.8V
33 Ssif/RefIn/Avl/

RefOut

34 L3 I Audio-L3 input (left signal) 98 PW_LED I POWER LED control
35 R3 I Audio-R3 input (right signal) 99 PW_LED I POWER LED control
36 L-OUT O Audio L output 100 V1.8C2 I 1.8V
37 R-OUT O Audio R output 101 VssC2 - GND
38 DecsDem - Decoupling sound demodulator 102 TIMER - Not used
39 QssO/AmO/

AudeEm
40 Gnd2 - GND 104 VER_PROTECT O X-ray protect
41 PllIf - IF-PLL loop filter 105 S_REDUCE O Sound control
42 SifAgc - AGC sound IF 106 P00/I2SDI1 O Not used
43 IfVo/FmRo/DvbO O Not used 107 POWER O SUB POWER control
44 NC O Not used 108 SCL1 I I2C bus clock
45 V8AudioSwitches I 8V 109 SDA1 I/O I2C bus data
46 AgcSsif - AGC capacitor second sound IF 110 V3.3P I 3.3V
47 V5P2 I 5V 111 ROTATION O Rotation
48 V-OUT O Video output 112 3.58/OTHER O NTSC 3.58 detection
49 L1 I Audio-L1 input 113 A_MUTE O Audio muting
50 R1 I Audio-R1 input 114 4.5/OTHER O NTSC 4.43 detection
51 V3 I Video V3 input 115 PROT I Protect
52 C4 I Not used 116 ECO_IN I ECO sensor level detection
53 Audio2InL I Not used 117 V1.8C1 I 1.8V (Digital)
54 Audio2InR I Not used 118 DecV1V8 I 1.8V
55 V2/Y I Video V2 input 119 KEY_IN I Key scan data
56 L2 I Audio L2 input (Left signal) 120 VDO-DET I Video DET input
57 R2 I Audio R2 input (right signal) 121 VSSC1+P1 - Digital GND
58 Y3/Cvbs I S-Video Y1 input 122 S_V_DET I S-Video DET input
59 C1 I S-Video C1 input 123 P25/PWM4 O GTVA_reset
60 AudioLsL O Audio L output for audio power amplifier 124 V1.8C3 I 1.8V (Digital)
61 AudioLsR O Audio R output for audio power amplifier 125 VssC3 - GND
62 HP-L O Not used 126 P12/Int2 I External interrupt
63 HP-R O Not used 127 SDA0 I/O I2C bus data (for memory)
64 CVBSO/PIP O CVBS / PIP output 128 SCL0 I I2C bus clock (for memory)

O Automatic Volume Levelling/ sound IF input / subcar-

rier reference output / external reference signal input
for I signalmixer for DVB operation

O QSS intercarrier output / AM output / deemphasis /

(front-end audio out)

Pin

Pin name I/O Function

No.

97 REMOTE I Remote control

103 TIMER - Not used

(No.YA465)1-5

SECTION 3

DISASSEMBLY

3.1 DISASSEMBLY PROCEDURE

3.1.1 REMOVING THE REAR COVER

• Unplug the power cord.
(1) Remove the 7 screws [A], and 2 screws [B].
(2) Withdraw the REAR COVER toward you.

CAUTION:

When reinstalling the rear cover, carefully push it inward after
inserting the MAIN PWB into the REAR COVER groove.

3.1.2 REMOVING THE MAIN PW BOARD

• Remove the REAR COVER.
(1) Slightly raise the both sides of the MAIN PWB by hand.
(2) Withdraw the MAIN PWB backward.

(If necessary, take off the wire clamp and connectors, etc.)

3.1.3 REMOVING THE SPEAKER

• Remove the REAR COVER.
(1) Remove the 2 screws [C].
(2) Follow the same steps when removing the other hand

SPEAKER.

3.1.4 CHECKING THE MAIN PW BOARD

• To check the back side of the MAIN PWB.
(1) Pull out the MAIN PWB. (Refer to REMOVING THE MAIN

PW BOARD).

(2) Erect the MAIN PWB vertically so that you can easily check

its back side.

CAUTIONS:

• Before turning on power, make sure that the CRT earth wire

and other connectors are properly connected.

• When repairing, connect the DEG. COIL to the DEG.

connector on the MAIN PWB.

3.1.5 WIRE CLAMPING AND CABLE TYING

(1) Be sure to clamp the wire.
(2) Never remove the cable tie used for tying the wires

together.
Should it be inadvertently removed, be sure to tie the wires
with a new cable tie.

1-6 (No.YA465)

SPEAKER

FRONT CABINET

SPEAKER

C

CRT SOCKET PWB

(Within MAIN PWB)

FRONT LED PWB

(Within MAIN PWB)

POWER CORD

C

MAIN PWB

REAR COVER

A

B

Fig.1

(No.YA465)1-7

3.2 MEMORY IC REPLACEMENT

• This model uses the memory IC.

Memory IC: IC702 on MAIN PWB

The memory IC memorizes data for correctly operating the video and deflection circuits. When replacing the memory IC, be sure to
use the same type IC written with the initial values of data. In other words, use the specific IC listed in "PRINTED WIRING BOARD
PARTS LIST". For its mounting location, refer to "ADJUSTMENT LOCATIONS".

3.2.1 MEMORY IC REPLACEMENT PROCEDURE

1. Power off

Switch off the power and disconnect the power plug from the

SERVICE MENU

AC outlet.

2. Replace the memory IC

Be sure to use the memory IC written with the initial setting
values.

3. Power on

Connect the power plug to the AC outlet and switch on the

SERVICE MENU

1. IF

3. AUDIO

5. VSM W/B

7. PLUG & PLAY (ON)

1-7 : SELECT DISPLAY : EXIT

2. V/C

4. DEF

6. S TATUS

power.

4. System constant check and setting

******* **** ***** *****
**** **** *** ***

* It must not adjust without signal.
(1) Press the [DISPLAY] key and the [PICTURE MODE] key

of the REMOTE CONTROL UNIT simultaneously.

Fig.1

(2) The SERVICE MODE screen of Fig. 1 will be displayed.
(3) While the SERVICE MODE is displayed, press the

[DISPLAY] key and the [PICTURE MODE] key
simultaneously, and the SYSTEM CONSTANT SET
screen of Fig. 2 will be displayed.

(4) Check the setting values of the SYSTEM CONSTANT

SET. If the value is different, select the setting item with the

[MENU /] key, and set the correct value with the
[MENU /] key.

(5) Press the [OK] key to memorize the setting value.
(6) Press the [DISPLAY] key twice, and return to the normal

screen.

SYSTEM CONSTANT-1

SYSTEM CONSTANT SET 1

SYSTEM
COMB
TILT
SUPER BASS
TEXT
LANGUAGE

: SEL  : OPE

 

: MULTI
: NO
: NO
: NO
: NO
: ERCMI

DISP : EXIT

5. Receiving channel setting

Refer to the OPERATING INSTRUCTIONS and set the
receive channels (Channels Preset) as described.

6. User settings

Check the user setting items according to the given in page
later.
Where these do not agree, refer to the OPERATING
INSTRUCTIONS and set the items as described.

7. SERVICE MODE setting

Verify what to set in the SERVICE MODE, and set whatever is

SYSTEM CONSTANT-2

SYSTEM CONSTANT SET 2

SOUND
BILINGUAL
BLUE BACK MUTE
COLOUR AUTO
ECO SENSOR
INTER CARRIER

: SEL  : OPE

 

: PB
: NO
: NO
: NO
: SIMPLE
: NO

DISP : EXIT

necessary (Fig.1).
Refer to the SERVICE ADJUSTMENT for setting.

SYSTEM CONSTANT-3

KEY ASSIGNMENT OF REMOTE CONTROL UNIT

SYSTEM CONSTANT SET 3

: YES
: NOPICTURE BOOSTER
: YESCOMPONENT
: NOPIP
: YES

: NO

DISP : EXIT

DISPLAY key

MENU key

OK key

PICTURE MODE

key

SURROUND

EXIT

MENU key

MENU key

MENU key

S INPUT
MAXX BASS

: SEL  : OPE

 

Fig.2

1-8 (No.YA465)

3.2.2 SYSTEM CONSTANT SETTING

Setting item Setting value

SYSTEM MULTI

COMB NO

TILT NO

SUPER BASS NO

TEXT NO

LANGUAGE E/R/C/M/I

SOUND PB

BILINGUAL NO

BLUE BACK MUTE NO

COLOUR AUTO NO

ECO SENSOR SIMPLE

INTER CARRIER NO

SURROUND YES

PICTURE BOOSTER

COMPONENT YES

PIP NO

S INPUT YES

MAXX BASS NO

3.2.3 SETTINGS OF FACTORY SHIPMENT

3.2.3.1 BUTTON OPERATION

Setting item Setting position

POWER Off

CHANNEL PR 1

VOLUME 15

3.2.3.2 REMOTE CONTROL DIRECT OPERATION

Setting item Setting position

CHANNEL PR1

VOLUME 15

PICTURE MODE BRIGHT

DISPLAY Indicated

TV/VIDEO TV

CINEMA SURROUND OFF

NO

3.2.3.3 REMOTE CONTROL MENU OPERATION

(1) PICTURE SETTING

Setting item Setting position

PICTURE MODE BRIGHT

CONTRAST / BRIGHT / SHARP
/ COLOUR / TINT

WHITE BALANCE COOL

VNR AUTO

(2) SOUND SETTING

Setting item Setting position

AI VOLUME OFF

SOUND MODE MUSIC

BALANCE Centre

CINEMA SURROUND OFF

(3) FEATURE SETTING

Setting item Setting position

DVD MENU

AUTO SIGNAL DETECT ON

DVD PICTURE MODE OFF

DVD THEATER STATUS OFF

DVD SOUND MODE THEATER

ON TIMER OFF

OFF TIMER OFF

CHILD LOCK OFF

COMPRESS (16:9) OFF

ECO MODE OFF

(4) INSTALL SETTING

Setting item Setting position

AUTO PROGRAM TV channel automatically set

EDIT/MANUAL PRESET CH only

COLOUR SYSTEM PAL

LANGUAGE ENGLISH

VIDEO-2 SETTING COMPONENT

BLUE BACK ON

BEEP ON

Centre

(No.YA465)1-9

3.2.4 SERVICE MODE SETTING ITEMS

Setting item Setting value

1. IF 1. VCO

2. DELAY POINT

2. V / C 1. SCREEN

2. CUTOFF(B/G)

3. WDR(R/G/B)

4. BRIGHT(TV/VDO 1/2/3)

5. CONT(TV/VDO 1/2/3)

6. COLOUR (TV/VDO1/2/3)

7. TINT(TV/VDO 1/2/3)

8. SHARP [Do not adjust]

9. Y DELAY [Do not adjust]

10. TINT DVD [Do not adjust]

11. AMP T. SHARP

3. AUDIO [Do not adjust] 1. DCXO ADJ

2. NICAM lower ERRLIM

3. NICAM upper ERRLIM

4. A2 ID THR

5. MENU EQUALIZER

4. DEF 1. V-SHIFT

2. V-SLOPE

3. V-SIZE

4. H-CENT

5. H-SIZE

6. TRAPEZ

7. EW-PIN

8. COR-UP

9. COR-LO

10. ANGLE

11. BOW

12. V-S.CR

13. V-LIN

14. V-ZOOM

5. VSM PRESET 1. BRIGHT

2. CONT

3. COLOUR

4. SHARP

5. HUE

1. R DRIVE

2. G DRIVE

3. B DRIVE

6. STATUS
[Dispaly only] ---

7. PLUG & PLAY(ON)
[Dispaly only] ---

1-10 (No.YA465)

3.3 REPLACEMENT OF CHIP COMPONENT

3.3.1 CAUTIONS

(1) Avoid heating for more than 3 seconds.
(2) Do not rub the electrodes and the resist parts of the pattern.
(3) When removing a chip part, melt the solder adequately.
(4) Do not reuse a chip part after removing it.

3.3.2 SOLDERING IRON

(1) Use a high insulation soldering iron with a thin pointed end of it.
(2) A 30w soldering iron is recommended for easily removing parts.

3.3.3 REPLACEMENT STEPS

1. How to remove Chip parts

2. How to install Chip parts

[Resistors, capacitors, etc.]

(1) As shown in the figure, push the part with tweezers and

alternately melt the solder at each end.

(2) Shift with the tweezers and remove the chip part.

[Transistors, diodes, variable resistors, etc.]

(1) Apply extra solder to each lead.

SOLDER

SOLDER

[Resistors, capacitors, etc.]

(1) Apply solder to the pattern as indicated in the figure.

(2) Grasp the chip part with tweezers and place it on the

solder. Then heat and melt the solder at both ends of the
chip part.

[Transistors, diodes, variable resistors, etc.]

(1) Apply solder to the pattern as indicated in the figure.
(2) Grasp the chip part with tweezers and place it on the

solder.

(3) First solder lead A as indicated in the figure.

(2) As shown in the figure, push the part with tweezers and

alternately melt the solder at each lead. Shift and remove
the chip part.

NOTE :

After removing the part, remove remaining solder from the
pattern.

A

B

C

(4) Then solder leads B and C.

A

B

C

(No.YA465)1-11

SECTION 4

ADJUSTMENT

4.1 ADJUSTMENT PREPARATION

(1) There are 2 ways of adjusting this TV : One is with the

REMOTE CONTROL UNIT and the other is the
conventional method using adjustment parts and
components.

(2) The adjustment using the REMOTE CONTROL UNIT is

made on the basis of the initial setting values. The
setting values which adjust the screen to the optimum
condition can be different from the initial setting
values.

(3) Make sure that connection is correctly made AC to AC

power source.

(4) Turn on the power of the TV and measuring instruments for

warming up for at least 30 minutes before starting
adjustments.

(5) If the receive or input signal is not specified, use the most

appropriate signal for adjustment.

(6) Never touch the parts (such as variable resistors,

transformers and condensers) not shown in the adjustment
items of this service adjustment.

4.2 PRESET SETTING BEFORE ADJUSTMENT

Unless otherwise specified in the adjustment items, preset the
following functions with the REMOTE CONTROL UNIT.

Item Preset value

PICTURE MODE(VSM) BRIGHT

VNR OFF

ECO MODE OFF

BALANCE Centre

BASS / TREBLE / BALANCE Centre

CINEMA SURROUND OFF

4.3 MEASURING INSTRUMENT AND FIXTURES

(1) DC voltmeter (or digital voltmeter)
(2) Oscilloscope
(3) HV voltmeter
(4) Signal generator

(Pattern generator : PAL/NTSC)

(5) Remote control unit

4.4 ADJUSTMENT ITEMS

 CHECK ITEMS

• B1 VOLTAGE check

• HIGH VOLTAGE check

• IF VCO check

 TUNER / IF CIRCUIT

• DELAY POINT (AGC) adjustment

 FOCUS

• FOCUS adjustment

 DEFLECTION CIRCUIT

• V.SLOPE adjustment

• V.POSITION adjustment

• V.SIZE adjustment

• H.POSITION adjustment

• H.SIZE adjustment

• SIDE PIN adjustment

• TRAPEZIUM adjustment

• V. LINEARITY adjustment

• CORNER adjustment

• H. PARALLEL adjustment

• H.BOW adjustment

 VIDEO CIRCUIT

• WHITE BALANCE adjustment

• SUB BRIGHT adjustment

• SUB CONTRAST adjustment

• SUB COLOUR adjustment

• SUB TINT adjustment

 VSM PRESET SETTING

• VSM PRESET

 PURITY AND CONVERGENCE

• PURITY adjustment

• STATIC CONVERGENCE adjustment

• DYNAMIC CONVERGENCE adjustment

1-12 (No.YA465)

4.5 ADJUSTMENT LOCATION

POWER
CORD

DEG COIL

POWER SW

PW

DEG

S901

MAIN PWB ASS'Y
(FRONT LED)

CN10A

S805

CN00A

S804 S802

S803 S801

1

T

6

IC701

FRONT

J808

J807

IC702

J806

J809

41

CN00S

HV

FRONT

DEF
YOKE

MAIN PWB ASS'Y

U

41

B1

GND

J804J801 J802 J803

CN00C

61

I2C

CN00C

1. 5V

2. SCL0

3. SDA0

4. SCL1

5. SDA1

6. GND

TU001

3

CN00B

CN00B

1. B1

2. NC

3. GND

1

MAIN PWB ASS'Y (CRT SOCKET)

(SOLDER SIDE)

T

1

6

TP-47G/R

TP-47B

14

HVT

UPPER : FOCUS

LOWER : SCREEN

TOP

TP-47R/G

TP-E

E1

41

CRT EARTH

(BRAIDED ASS'Y)

U

(No.YA465)1-13

4.6 BASIC OPERATION OF SERVICE MODE

4.6.1 TOOL OF SERVICE MODE OPERATION

Operate the SERVICE MODE with the REMOTE CONTROL UNIT.

4.6.2 SERVICE MODE ITEMS

With the SERVICE MODE, various adjustments can be made, and they are broadly classified in the following items of settings.

1.IF This mode adjusts the setting values of the IF circuit.

2. V/C This mode adjusts the setting values of the VIDEO circuit.

3.AUDIO This mode adjusts the setting values of the multiplicity AUDIO circuit. [Do not adjust]

4. DEF This mode adjusts the setting values of the DEFLECTION circuit for each aspect mode given below.

5.VSM PRESET This mode adjusts the initial setting values of BRIGHT, STANDARD and SOFT. (VSM : Video Status Memory)

6.STATUS It is no requirement to adjustment. [Do not adjust]

7.PLUG & PLAY (ON) This mode adjusts the setting values of the PIP circuit. [Do not adjust]

4.6.3 BASIC OPERATION IN SERVICE MODE

4.6.3.1 HOW TO ENTER THE SERVICE MODE

(1) Press the [DISPLAY] key and the [PICTURE MODE] key

simultaneously, then enter the SERVICE MODE.

(2) When the main menu is displayed, press any key of the [7]

to [9] key to enter the corresponding sub menu mode.

SERVICE MENU

4.6.3.2 SETTING METHOD

 1.IF

[1. VCO] : It must not adjust without signal

(1) [1] key

Select 1.IF.

(2) [1] key

Select 1.VCO(CW).

SERVICE MENU

1. IF

3. AUDIO

5. VSM W/B

7. PLUG & PLAY (ON)

1-7 : SELECT DISPLAY : EXIT

******* **** ***** *****
**** **** *** ***

2. V/C

4. DEF

6. S TATUS

Fig.1

SERVICE MODE SELECT KEY

 2. V/C, 4. DEF

Check the arrow position between the ABOVE REF. and
BELOW REF.

(3) [DISPLAY] key

Return to the SERVICE MODE main manu screen.

(1) [2], [4] key

Select one from 2. V/C, 4. DEF.

(2) [MENU /] key

Select setting items.

(3) [MENU /] key

Set the setting values of the setting items.

 5.VSM W/B

DISPLAY key

MENU key

OK key

PICTURE MODE

key

EXIT

MENU key

MENU key

MENU key

(1) [5] key

Select 5.VSM W/B.

(2) [OK] key

Select setting items.

(3) [MENU /] key

Set the setting values of the setting items.

1-14 (No.YA465)

Fig.2

4.6.3.3 MEMORIZE THE ADJUSTMENT DATA

When adjustment is completed, press the [OK] key to memorize
the adjustment value. If not to do so, the data is not memorized
to the memory IC. And if exit the adjustment mode before to
memorize the data, the adjustment value which you have
changed will be canceled.

4.6.3.4 RELEASE OF SERVICE MODE

After completing the setting, return to the SERVICE MODE, then
again press the [DISPLAY] key.