JVC av27f475s schematic

SERVICE MANUAL

COLOR TELEVISION

YA05320043

AV-27F475 /S, AV-27F475 /Z,
AV-27F485

/S, AV-27F485 /Z

BASIC CHASSIS

GJ4

TABLE OF CONTENTS

1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11

5 TROUBLE SHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-27

COPYRIGHT © 2004 VICTOR COMPANY OF JAPAN, LIMITED

No.YA053

2004/3

SPECIFICATION

Items

Dimensions (W × H × D) 82.9 cm × 59.3 cm × 51.9cm (32-5/8" × 23-3/8" × 20-1/2")

Mass 43.0kg (94.6Ibs)

TV RF System CCIR (M)

Color System NTSC

Sound System BTSC (Multi Channel Sound)

TV Receiving Channels
and Frequency

TV / CATV Total Channel 180 Channels

Intermediate Frequency Video IF

Color Sub Carrier 3.58 MHz

Power Input AC120V, 60Hz

Power Consumption 140W

Picture Tube (Visible size) 68cm (27”) Measured diagonally (H : 54.4cm × W : 41.8cm)

High Voltage 30.0kV ±1.3kV [at Zero beam current]

Speaker 6.5cm × 13cm (2-1/2" × 5"), Oval type × 2

Audio Power Output 7.5W + 7.5W 9W + 9W

Antenna Terminal (VHF / UHF) F-type connector, 75 Ω unbalanced

Video / Audio input
Input-1/2/3

Audio Output (Fix) 500mV(rms)(-4dBs), low Impedance, (400kHz when modulated 100%),

Remote Control Unit RM-C1258G (AA/R6/UM-3 battery × 2)

Component Video

VHF low

VHF high

UHF

CATV

Sound IF

[Input-2]

S-video

[Input-1]

Video
Audio

02ch~06ch : 54MHz~88MHz
07ch~13ch : 174MHz~216MHz
14ch~69ch : 470MHz~806MHz
54MHz~804MHz
Low Band : 02~06, A-8 by 02~06&01
High Band : 07~13 by 07~13
Mid Band : A~I by 14~22
Super Band : J~W by 23~36
Hyper Band : W+1~W+28 by 37~64
Ultra Band : W+29~W+84 by 65~125
Sub Mid Band : A8, A4~A1 by 01, 96~99

45.75 MHz

41.25 MHz (4.5MHz)

RCA pin jack × 3
Y : 1V(p-p), negative sync, 75 Ω
Pb/Pr : 0.7V(p-p), 75 Ω
Mini DIN 4-pin × 1
Y : 1V(p-p), negative sync, 75 Ω
C : 0.286V(p-p)(burst signal), 75 Ω
1V(p-p), negative sync, 75 Ω, RCA pin jack × 3
500mV(rms)(-4dBs), high impedance, RCA pin jack × 6

RCA pin jack × 2

AV-27F475 AV-27F485

Contents

Design & specifications are subject to change without notice.

1-2 (No.YA053)

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) Use isolation transformer when hot chassis.

The chassis and any sub-chassis contained in some products are
connected to one side of the AC power line. An isolation
transformer of adequate capacity should be inserted between the
product and the AC power supply point while performing any
service on some products when the HOT chassis is exposed.

(5) Don't short between the LIVE side ground and ISOLATED (NEU-

TRAL) 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.

(6) If any repair has been made to the chassis, it is recommended that

the B1 setting should be checked or adjusted (See B1 POWER
SUPPLY check).

(7) 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.

(8) 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.

(9) 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.

(10) 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 1100V AC
(r.m.s.) for a period of one second.

(. . . . Withstand a voltage of 1100V AC (r.m.s.) to an appliance rat-

ed 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

(11) High voltage hold down circuit check.

GOOD EARTH GROUND

ON EACH EXPOSED
ME TAL PA RT

After repair of the high voltage hold down circuit, this circuit shall
be checked to operate correctly.See item "How to check the high
voltage hold down circuit".

This mark shows a fast
operating fuse, the
letters indicated below
show the rating.

A V

POWER CORD
REPLACEMENT WARNING.

Connecting the white line side of power
cord to "WHT" character side.

PWB

White line side

WHT

PW

(No.YA053)1-3

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

2.1 FEATURES

SMART CAPTION [AV-27F485]

Smart caption will appear when you press the MUTING button,
only on channels where the broadcast contains CLOSED
CAPTION information.

SMART SOUND

Decreases high sound levels, giving a regulated sound level.

FLAT SQUARE CRT

It became legible from any position by CRT with few reflection
and reflect lumps on the flat screen.

DIGITAL COMB FILTER

By the 3 line digital comb filter, the refreshed image can be
seen.

VIDEO STATUS

Expression of a favorite screen can be chosen by the VIDEO
STATUS function.

[STANDARD ↔ DYNAMIC ↔ THEATER ↔ GAME]

COMPONENT INPUT

Since the component signal input terminal is equipped, it
reappears direct without deteriorating the signal from DVD.

V-CHIP

Since the V-CHIP is built in, it can choose, view and listen to a
healthy program.

MTS STEREO

The voice multiplex function of the MTS system is built in.
(MTS = Multi channel Television Sound system)

RETURN PLUS

You program a specific channel to return to while scanning
through the channels using the CH+ and CH - keys.

VIDEO INPUT LABEL

This function is used to label video input connections for the
onscreen displays.

WORLD CLOCK

The world clock feature provides time differences for some of
the major cities around the world in real time.

BBE

High definition audio adds natural, clear and extraordinary
sound quality to any program.

A.H.S. [AV-27F485]

Adds a more spacious surround sound. Music gives basic
effect and Movie for more effect.

HYPER SURROUND [AV-27F475]

Creates a deep, three-dimensional sound effect by channeling
the audio through the TV's front-firing speakers.

2.2 HOW TO IDENTIFY MODELS

How to recognize from the appearance of the model concerned is written below. Please distinguish from several contents currently
printed on the rating label

MODEL NAME

AV-27F475

AC 120V 60Hz

MODEL NO.

TV SCREEN SIZE : DIAGONAL

CHASSIS NO.
MANUFACTURED
SERIAL NO.

W

INCHES

ME

VIDEO EQUIPMENT

4C43

AV-27F485

DISTINGUISH NAME

S

Z

2.3 MAIN DIFFERENCE LIST

The difference between S models and Z models are in the PICTURE TUBE.

Item AV-27F475/S AV-27F475/Z AV-27F485/S AV-27F485/Z

PICTURE TUBE (ITC) A68QCP693X003 A68QCU770X78N A68QCP693X003 A68QCU770X78N

SMART CAPTION NO ← YES ←
A.H.S. NO ← YES ←
HYPER SURROUND YES ← NO ←

1-4 (No.YA053)

2.4 TECHNICAL INFORMATION

2.4.1 SYSTEM BLOCK DIAGRAM

REMOCON
RECEIVER

IC702

MEMORY

SCL0 SDA0

IC5001

MTS

TONE/VOL

REMOCON

IC201

MAIN MI-COM /

SCL1

SDA1

SCL0 SDA0 SCL0 SDA0

VIDEO PROCESS /

DEF. PROCESS

SCL0 SDA0

IC5501

LATCH&
AV SW

IC5201

3-LINE YC SEP.

AFT1

SCL0 SDA0

TU001

TUNER

IC101

IF DET

SCL0 SDA0

IC502

D-A CONVERTER

2.4.2 MAIN MI-COM (CPU) PIN FUNCTION

Pin

Pin name I/O Function

No.

1 MTS_ADJ I Not used 29 YC_GND - GND

2 AFT1 I AFT voltage for tuner (Tuning frequency control) 30 V1_IN I Not used

3 KEY I Key scan for front control [No signal : H] 31 ABCL I Current for automatic beam (brightness)/contrast limit

4 uP_DVss - GND 32

5 Reset I CPU reset 33 BLACK_DET - Black level detection filter

6 8MHz_OUT O CPU system clock : 8MHz oscillation 34 SVM_OUT O Y signal for velocity scan modulation

7 8MHz_IN I CPU system clock : 8MHz oscillation 35 APL_FIL - Average picture level filter

8 TEST - GND 36 APC_FIL - Automatic phase control filter

9 uP_DVD D - 5V 37 fsc_OUT O Color sub carrier (3.58MHz) for 3-line digital comb filter [IC5201]

10 AGC_MUTE O AGC muting for tuner (when channel select) [Muting : H] 38 YC_Vcc - 5V (for video process circuit)

11 uP_VVSS - GND 39 R_OUT O R signal

12 TV_HGND - GND 40 G_OUT O G signal

13 FBP_SCP I Flyback pulse (H. pulse) 41 B_OUT O B signal

14 HOUT O H. drive (oscillation) 42 RGB_Vcc - 9V (for RGB process circuit)

15 H_Vcc - 9V (for H. oscillation start) 43 IK_IN I Not used

16 HAFC_1 - H. AFC filter 44 TV_DGND - GND

17 Vsaw - V. saw filter 45 uP_AGND - GND

18 VOUT O V. drive 46 uP_AVdd - 5V

19 EW_OUT O Parabola waveform (for sidepin correection) 47 MAIN_POWER O Power on/off switching control [Powen on : L]

20 X-RAY I X-ray detection (for protection) [Detection : H] 48 PANORAMA I Not used

21 Ys I Not used 49 SDAO I/O Data for Inter IC control bus (for various devices)

22 Cb_IN I Cb (external) signal 50 SCLO O Clock for Inter IC control bus (for various devices)

23 Y_IN I Y (external) signal 51 SDA1 I/O Data for Inter IC control bus (for main memory)

24 Cr_IN I Cr (external) signal 52 A_MUTING O Audio muting [Muting : H]

25 TV_DVcc - 3.3V 53 SCL1 O Clock for Inter IC control bus (for main memory)

26 V3IN/CIN I Chroma signal (for YC separation output) 54 LED O POWER / ON TIMER LED lndication [lighting : L]

27 EHT_IN I Not used 55 REMOCON I Remote control sensor input [No input : H]

28 V2_IN/Y_IN I Y signal (for YC separation output) 56 ASP_ABL I Not used

Pin

Pin name I/O Function

No.

MONITOR_OUT

O Not used

(No.YA053)1-5

SECTION 3

DISASSEMBLY

3.1 DISASSEMBLY PROCEDURE

3.1.1 REMOVING THE REAR COVER

(1) Disconnect the power plug.
(2) Remove the 11 screws [A].
(3) Withdraw the REAR COVER backward.

3.1.2 REMOVING THE AV TERMINAL BOARD

• Remove the REAR COVER.
(1) Remove the 5 screws [B].
(2) Withdraw the AV TERMINAL BOARD toward you.

3.1.3 REMOVING THE CHASSIS

• Remove the REAR COVER.

• Remove the AV TERMINAL BOARD.
(1) Slightly raise the both sides of CHASSIS by hand.
(2) Remove the 2 claws under the both side of the CHASSIS

from the front cabinet.

(3) Withdraw the CHASSIS backward.

(If necessary, remove the wire clamp, connectors etc.)

3.1.7 CHECKING THE CHASSIS

To check the PW Board from back side.

(1) Pull out the CHASSIS (refer to REMOVING THE CHASSIS).
(2) Erect the CHASSIS vertically with the HVT side facing up

so that you can easily check the back side of the PW board.

CAUTION :

• When erecting the CHASSIS, be careful so that there will be
no contacting with other PW Board.

• Before turning on power, make sure that the wire connector
is properly connected.

• When conducting a check with power supplied, be sure

to confirm that the CRT EARTH WIRE (BRAIDED ASS'Y)
is connected to the CRT SOCKET PWB.

3.1.8 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.

3.1.4 REMOVING THE SPEAKER

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

SPEAKER.

NOTE :

When remove the 2 screws [C] of the SPEAKER, remove the
lower side screw first, and then remove the upper one.

3.1.5 REMOVING THE LED & POWER SW PWB

• Remove the REAR COVER.
(1) Remove the 2 screws [E].
(2) Withdraw the LED & POWER SW PWB toward you.

*If necessary, remove the wire clamp, connector etc.

3.1.6 REMOVING THE FRONT CONTROL PWB

• Remove the REAR COVER.
(1) Remove the 2 screws [F].
(2) Withdraw the FRONT CONTROL PWB toward you.

*If necessary, remove the wire clamp, connector etc.

1-6 (No.YA053)

FRONT CABINET

D

SPEAKER

C

LED & POWER SW PWB

CLAW

CRT SOCKET PWB

F

E

FRONT CONTROL PWB

CLAW

AV SELECTOR
PWB

SPEAKER HOLDER

MAIN PWB

POWER CORD

AV TERMINAL
BOARD

B

REAR COVER

A

Fig.1

(No.YA053)1-7

3.2 MEMORY IC REPLACEMENT

• This model uses the memory IC.

• This memory IC stores data for proper operation of the video
and drive circuits.

• When replacing, be sure to use an IC containing this (initial val­ue) data.

3.2.1 MEMORY IC REPLACEMENT PROCEDURE

1. Power off

Switch off the power and disconnect the power cord from the
wall outlet.

2. Replace the memory IC

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

3. Power on

Connect the power cord to the wall outlet and switch on the
power.

4. Receiving channel setting

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

5. User settings

Check the user setting items according to the "FACTORY
SETTING ITEM" table.
Where these do not agree, refer to the OPERATING
INSTRUCTIONS (USER'S GUIDE) and set the items as
described.

6. SERVICE MODE setting

Verify what to set in the SERVICE MODE, and set whatever is
necessary(Fig.1) .
Refer to the SERVICE ADJUSTMENT for setting.

3.2.2 SERVICE MODE SETTING ITEMS

SERVICE MENU

SERV ICE MENU

1.

V/C(S)

3.

SOUND(A)

5.

3L Y/C(LYC)

7.

LOW LIGHT

9.

VCO

11.

I2C BUS

SELECT BY
OPERATE BY

2.

DEF(D)

4.

OTHERS(F)

8.

HIGH LIGHT

12.

SYSTEM(SYS)

EXIT BY

Fig.1

Setting items Settings Item No.

1. V/C

(Video setting)

2. DEF

(Deflection setting)

3. SOUND(A)
(Audio setting)

4. OTHERS [Do not adjust]
(Factory setting)

5. 3L Y/C [Do not adjust]
(Y/C Separate setting)

7. LOW LIGHT

(White balance setting)

8. HIGH LIGHT
(White balance setting)

9. VCO

(VCO setting)

11. I2C BUS [Do not adjust]

2

C BUS setting)

(I

12.SYSTEM (SYS)

(System constant setting)

Adjust S01~S48

Adjust D01~D33

Adjust A01~A08

Fixed F01~F18

Fixed LYC01~LYC12

Adjust ---

Adjust ---

Adjust ---

Fixed ---

Fixed SYS01~SYS25

EXIT

1-8 (No.YA053)

3.2.3 SETTINGS OF FACTORY SHIPMENT

3.2.3.1 BUTTON OPERATION 3.2.3.2 REMOTE CONTROL DIRECT OPERATION

Setting item Setting position

POWER Off

CHANNEL CH-02

VOLUME 10

3.2.3.3 REMOTE CONTROL MENU OPERATION

(1) PICTURE ADJUST

Setting item Setting position

TINT 0

COLOR 0

PICTURE +8

BRIGHT 0

DETAIL +8

COLOR TEMPERATURE HIGH

NOISE MUTING ON

VSM ON

(2) SOUND ADJUST

Setting item Setting position

BASS 0

TREBLE 0

BALANCE 0

MTS STEREO

SMART SOUND OFF

INPUT TV

CHANNEL CH-02

VOLUME 10

MUTING OFF

DISPLAY OFF

OFF TIMER OFF

THEATER PRO OFF

VIDEO STATUS DYNAMIC

ASPECT 4:3

SOUND

(3) CLOCK / TIMERS

SET CLOCK OFF

ON / OFF TIMER OFF

WORLD CLOCK Refer to OPERATING

(4) INITIAL SETUP

LANGUAGE ENG.

CLOSED CAPTION OFF

FRONT PANEL LOCK OFF

AUTO SHUT OFF OFF

XDS ID ON

VIDEO INPUT LABEL Refer to OPERATING

V-CHIP OFF

Setting item Setting position

A.H.S OFF [AV-27F485]

HYPER SURROND OFF [AV-27F475]

BBE ON

Setting item Setting position

INSTRUCTIONS

Setting item Setting position

INSTRUCTIONS

(No.YA053)1-9

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.

1-10 (No.YA053)

A

B

C

(4) Then solder leads B and C.

A

B

C

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

warning 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 ADJUSTMENTS

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

Item Preset value

ASPECT 4:3

VIDEO STATUS STANDARD

TINT / COLOR / PICTURE / BRIGHT / DETAIL 0

COLOR TEMPERATURE LOW

VSM OFF

BASS / TREBLE / BALANCE 0

MTS STEREO

BBE OFF

A.H.S [AV-27F485] OFF

HYPER SORROUND [AV-27F475] OFF

4.3 MEASURING INSTRUMENT AND FIXTURES

• DC voltmeter (or digital voltmeter)

• Oscilloscope

• Frequency counter

• Signal generator (Pattern generator) [NTSC]

• TV audio multiplex signal generator

• Remote control unit

4.4 ADJUSTMENT ITEMS

CHECK ITEM

• B1 POWER SUPPLY check

• HIGH VOLTAGE HOLD DOWN check

TUNER / IF CIRCUIT

• IF VCO adjustment

FOCUS

• FOCUS adjustment

DEFLECTION CIRCUIT

• V. SIZE / V. POSITION (4:3) adjustment

• V. SIZE / V. POSITION (16:9) adjustment

• H. POSITION / H. SIZE / SIDE PIN (4:3) / (16:9) adjustment

VIDEO CIRCUIT

• WHITE BALANCE(High Light & Low Light) adjustment

• SUB BRIGHT adjustment

• SUB CONTRAST adjustment

MTS CIRCUIT

• MTS INPUT LEVEL adjustment

• MTS SEPARATION adjustment

(No.YA053)1-11

4.5 ADJUSTMENT LOCATIONS / WIRING

㪟㪭㪫

㪭㩷㪚 㪜㪥 㪫㪜㪩 㩷㪪 㪮

㪭㪚㪦

LED & POWER SW
PWB

POWER

AV SW
PWB

POWER
LED

SS

CN5006

MEMORY IC

CN001

TO SPEAKER

CN007

IC702

FRONT

REMOCON

B

FRONT

FRONT CONTROL PWB

CN6007 CN6006

B

FRONT

MAIN PWB

DEG.

F901

5A

CN004

PW

IC201

CRT SOCKET PWB

(SOLDER SIDE)

TP-R

CN3004

TP-B

TP-E( )

CN3005

T111

㪭㪚㪦

TOP

TUNER

DOWN

C

㪭㩷㪚㪜㪥㪫㪜㪩㩷㪪㪮

㩷

S1401

UP

5

1 : TP-E
2 : X-RAY2
3 : X-RAY1
4 : NC
5 : TP-91

( )

HV

㪟㪭㪫

E1

S1

CN005

1

CRT EARTH

(BRAIDED ASS'Y)

UPPER : FOCUS
LOWER : SCREEN

1-12 (No.YA053)

4.6 BASIC OPERATION OF SERVICE MODE

MAIN MENU

SERVICE MENU

1.V/C(S) 2.DEF(D)

3.SOUND(A) 4.OTHERS(F)

5.3L Y/C(LYC)

7.LOW LIGHT 8.HIGH LIGHT

9.VCO

11.I2C BUS 12.SYSTEM(SYS)

SELECT BY
OPERATE BY EXIT BY

RF 4 : 3 STD LOW

S01 BRIGHT

RF 4 : 3 STD LOW

D01 V FREQ

EXIT

1.V/C(S)

2.DEF(D)

SUB MENU

7.LOW LIGHT

BRIGHT

8.HIGH LIGHT

9.VCO

TOO HIGH GOOD TOO LOW

SYNC: YES
AFC ON
FINE 0

3.SOUND(A)

A01 IN LEVEL

4.OTHERS(F) [Fixed value]

F01

5.3L Y/C(LYC) [Fixed value]

LYC01

11.I2C BUS [Fixed value]

I2C BUS ON

12.SYSTEM(SYS) [Fixed value]

SYS01 VIDEO IN

(No.YA053)1-13

4.6.1 TOOL OF SERVICE MODE OPERATION

Operate the SERVICE MODE with the REMOTE CONTROL UNIT.

4.6.2 SERVICE MODE ITEMS

In general, basic setting (adjustments) items or verifications are performed in the SERVICE MODE.

1. V/C (S) This sets the setting values of the VIDEO circuit.

2. DEF (D) This sets the setting values of the DEFLECTION circuit.

3. SOUND (A) This sets the setting values of the AUDIO circuit.

4. OTHERS (F) This sets the setting values of the factory settings. [Do not adjust]

6. 3L Y/C(LYC) This sets the setting values of the 3 line YC separation control circuit. [Do not adjust]

7. LOW LIGHT This sets the setting values of the WHITE BALANCE (LOW LIGHT) control circuit.

8. HIGH LIGHT This sets the setting values of the WHITE BALANCE (HIGH LIGHT) control circuit.

9. VCO This sets the setting values of the VCO control circuit.

2

11. I2C BUS This sets the setting values of the I

C BUS control circuit. [Do not adjust]

12. SYSTEM(SYS) This sets the setting values of the system control circuit. [Do not adjust]

4.6.3 HOW TO ENTER THE SERVICE MODE

(1) Set to 0 minutes using the [SLEEP TIMER] key.
(2) Press the [VIDEO STATUS] key and [DISPLAY] key

SERVICE MODE SELECT KEY

simultaneously, then enter the SERVICE MODE.

NOTE:

Before entering the SERVICE MODE, confirm that the setting
of TV / CATV switch of the REMOTE CONTROL UNIT is at the

TV/CATV
switch

"TV" side and the setting of VCR / DVD switch is at the "VCR"
side. If the switches have not been properly set, you cannot
enter the SERVICE MODE.

DISPLAY

SLEEP
TIMER

4.6.4 HOW TO STORE OF SETTING VALUE

The setting value will be stored automatically when release the
REMOTE CONTROL UNIT keys

VIDEO
STATUS

ASPECT

VCR/DVD
switch

POWER

NUMBER

CH+

4.6.5 HOW TO EXIT THE SERVICE MODE

Press the [EXIT] key to exit the SERVICE MODE.

VOL-

MENU

VOL+

EXIT

CH-

RM-C1258G

1-14 (No.YA053)

4.6.6 SERVICE MODE SETTING

A

1. V/C, 2. DEF

• Press [CH+] / [CH-] key
For scrolling up/down the adjustment item.

• Press [VOL+] / [VOL-] key
For scrolling up/down the data values.

NOTE:

The setting value will be stored automatically when release
the REMOTE CONTROL UNIT keys.

INPUT
SIGNAL

RF 4 : 3 STD LOW

SPECT

COLOR
TEMPERATURE

VIDEO
STATUS

7. LOW LIGHT

The settings for LOW LIGHT is described in the WHITE
BALANCE page of ADJUSTMENT PROCEDURE.

NOTE:

The setting value will be stored automatically when release
the REMOTE CONTROL UNIT keys.

SETTING VALUESETTING ITEM

BRIGHT

SETTING ITEM

SETTING NO.

SETTING VALUE

(1) INPUT SIGNAL

RF : Antenna input
COMP : External (component) input
EXT : External (S / Composite) input

(2) ASPECT

4:3 : 4:3 screen mode
16:9 : 16:9 screen mode

(3) VIDEO STATUS

STD : STANDARD
THEA : THEATER

(4) COLOR TEMPERATURE

HIGH : White balance high mode
LOW : White balance low mode

3. SOUND (A)

• Press [CH+] / [CH-] key
For scrolling up/down the adjustment item.

• Press [VOL+] / [VOL-] key
For scrolling up/down the data values.

NOTE:

The setting value will be stored automatically when release
the REMOTE CONTROL UNIT keys.

R CUTOFF

G CUTOFF B CUTOFF

SETTING VALUE

8. HIGH LIGHT

The settings for HIGH LIGHT is described in the WHITE
BALANCE page of ADJUSTMENT PROCEDURE.

NOTE:

The setting value will be stored automatically when release
the REMOTE CONTROL UNIT keys.

SETTING VALUE

B DRIVER DRIVE

9. VCO

The setting for VCO is described in the IF VCO page of
ADJUSTMENT PROCEDURE.

VCO adjustment status (AFC level)

TOO HIGH GOOD TOO LOW

SYNC INPUT

AFC SW

SYNC: YES
AFC OFF
FINE 0

Setting value

A01 IN LEVEL

SETTING NO.

SETTING ITEM

SETTING VALUE

(No.YA053)1-15

4.7 INITIAL SETTING VALUE OF SERVICE MODE

(1) Adjustment of the SERVICE MODE is made on the basis of the initial setting values ; however, the new setting values which set

the screen in its optimum condition may differ from the initial setting.
(2) Do not change the initial setting values of the setting items NOT LISTED IN ADJUSTMENT PROCEDURE.
(3) --- : This mark described in each table shows "Cannot adjust it."

4.7.1 [1.V/C(S)]

Initial setting value

AV-27F475/S

No.

S01 BRIGHT 0 ~ 127 64 --- --- --- ---

S02 PICTURE 0 ~ 127 60 --- --- --- ---

S03 COLOR 0 ~ 127 44 --- --- --- 48

S04 TINT 0 ~ 127 52 --- --- --- 68

S05 DETAIL 0 ~ 63 35 --- --- 40 40

S06 BRIGHT+- -32 ~ +32 --- ±0 +1 +4 -3

S07 PICT+- -32 ~ +32 --- -8 -10 ±0 -12

S08 COLOR+- -32 ~ +32 --- ±0 -3 +1 ---

S09 TINT+- -32 ~ +32 --- ±0 -3 +9 ---

S10 DETAIL+- -32 ~ +32 --- --- ±0 --- ---

Setting

item

Variable

range

RF

STANDARD THEATER STANDARD STANDARD

4:316:94:3 4:3 4:3

AV-27F485/S

EXTERNAL

S / COMPOSITE

(

EXTERNAL

)

(COMPONENT)

Initial setting value

AV-27F475/Z

No.

S01 BRIGHT 0 ~ 127 64 --- --- --- ---

S02 PICTURE 0 ~ 127 60 --- --- --- ---

S03 COLOR 0 ~ 127 39 --- --- --- 44

S04 TINT 0 ~ 127 57 --- --- --- 75

S05 DETAIL 0 ~ 63 35 --- --- 40 40

S06 BRIGHT+- -32 ~ +32 --- ±0 +1 -2 -2

S07 PICT+- -32 ~ +32 --- -8 -10 ±0 -5

S08 COLOR+- -32 ~ +32 --- ±0 -3 -3 ---

S09 TINT+- -32 ~ +32 --- ±0 -3 +14 ---

S10 DETAIL+- -32 ~ +32 --- --- ±0 --- ---

Setting

item

Variable

range

RF

STANDARD THEATER STANDARD STANDARD

4:316:94:3 4:3 4:3

AV-27F485/Z

EXTERNAL

(

S / COMPOSITE

EXTERNAL

)

(COMPONENT)

1-16 (No.YA053)

Initial setting value

AV-27F475/S

No.

S11 R CUT OFF 0 ~ 255 30 --- --- --- --- --- --- ---

S12 G CUT OFF 0 ~ 255 30 --- --- --- --- --- --- ---

S13 B CUT OFF 0 ~ 255 30 --- --- --- --- --- --- ---

S14 R DRIVE 0 ~ 127 64 --- --- --- --- --- --- ---

S15 B DRIVE 0 ~ 127 64 --- --- --- --- --- --- ---

S16 R CUT +- -128 ~ +127 --- ±0 ±0 ±0 -5 --- --- ---

S17 G CUT +- -128 ~ +127 --- ±0 ±0 ±0 +5 --- --- ---

S18 B CUT +- -128 ~ +127 --- ±0 ±0 ±0 -6 --- --- ---

S19 R DRV +- -128 ~ +127 --- +5 +13 +7 ±0 --- --- ---

S20 B DRV +- -128 ~ +127 --- +6 -25 -9 ±0 --- --- ---

S21NTSC MAT0 ~ 333112211

S22 BLACK ST 0 ~ 3 2 --- 2 --- --- --- --- ---

S23 DC REST 0 ~ 1 1 --- 1 --- --- --- --- ---

S24 DCRSW 0 ~ 1 1 --- 1 --- --- --- --- ---

Setting

item

Variable

range

RF / EXTERNAL (S / COMPOSITE) EXTERNAL (COMPONENT)

STANDARD THEATER STANDARD THEATER

LOW HIGH LOW HIGH LOW HIGH LOW HIGH

AV-27F485/S

Initial setting value

AV-27F475/Z

No.

S11 R CUT OFF 0 ~ 255 30 --- --- --- --- --- --- ---

S12 G CUT OFF 0 ~ 255 30 --- --- --- --- --- --- ---

S13 B CUT OFF 0 ~ 255 30 --- --- --- --- --- --- ---

S14 R DRIVE 0 ~ 127 64 --- --- --- --- --- --- ---

S15 B DRIVE 0 ~ 127 64 --- --- --- --- --- --- ---

S16 R CUT +- -128 ~ +127 --- ±0 ±0 ±0 -5 --- --- ---

S17 G CUT +- -128 ~ +127 --- ±0 ±0 ±0 ±0 --- --- ---

S18 B CUT +- -128 ~ +127 --- ±0 ±0 ±0 -6 --- --- ---

S19 R DRV +- -128 ~ +127 --- +5 +13 +7 ±0 --- --- ---

S20 B DRV +- -128 ~ +127 --- +6 -25 -9 ±0 --- --- ---

S21NTSC MAT0 ~ 333112211

S22 BLACK ST 0 ~ 3 2 --- 2 --- --- --- --- ---

S23 DC REST 0 ~ 1 1 --- 1 --- --- --- --- ---

S24 DCRSW 0 ~ 1 1 --- 1 --- --- --- --- ---

Setting

item

Variable

range

RF / EXTERNAL (S / COMPOSITE) EXTERNAL (COMPONENT)

STANDARD THEATER STANDARD THEATER

LOW HIGH LOW HIGH LOW HIGH LOW HIGH

AV-27F485/Z

No.

S25 ASSY SHRP 0 ~ 7 4 4 4

S26 BPF FO 0 ~ 1 0 0 ---

S27 KILR OFF 0 ~ 1 0 0 ---

S28 KILR SEN 0 ~ 1 1 1 ---

Setting

item

Variable

range

RF

Initial setting value

EXTERNAL (S / COMPOSITE)

EXTERNAL (COMPONENT)

(No.YA053)1-17

No.

S29 RGB MUTE 0 ~ 1 0

S30 BLUE B 0 ~ 1 0

S31 VIDEO SW 0 ~ 3 3

S32 CMP ABCL 0 ~ 1 0

S33 OSD ABL 0 ~ 1 0

S34 OSD CONT 0 ~ 63 7

S35 SUB CONT 0 ~ 15 5

S36 ABL GAIN 0 ~ 3 0

S37 ABL PNT 0 ~ 3 3

S38 Y GAMMA 0 ~ 3 1

S39 Y MUTE 0 ~ 1 0

S40 SVM GAIN 0 ~ 3 3

S41 SVM PH 0 ~ 3 1

S42 WPL 0 ~ 1 0

S43 COL GMM 0 ~ 1 0

S44 V1 GAIN 0 ~ 7 4

S46 VMOFF DE -128 ~ +127 3

S47 APC CLK 0 ~ 1 1

S48 PIP ADJ 0 ~ 15 4

Setting

item

Variable

range

Initial setting value

1-18 (No.YA053)

4.7.2 [2. DEF (D)]

Initial setting value

No.

D01V FREQ0 ~ 3003003

D02AFC GAIN0 ~ 3002002

D03 H POSI 0 ~ 31 21 --- 21 20 --- 20

D04 H POSI+- -128 ~ +127 --- 0 --- --- 0 ---

D05 V PHASE 0 ~ 7 0 --- 0 0 --- 0

D06 V PH+- -128 ~ +127 --- 0 --- --- 0 ---

D07 V SIZE 0 ~ 127 105 --- 105 100 --- 100

D08 V SIZE+- -128 ~ +127 --- -30 --- --- -25 ---

D09 V CENTER 0 ~ 63 32 --- 32 32 --- 32

D10 V CENT+- -128 ~ +127 --- 0 --- --- 0 ---

D11 V S CORR 0 ~ 15 7 --- 7 9 --- 9

D12 V S CO+- -128 ~ +127 --- 0 --- --- 0 ---

D13 V LIN 0 ~ 15 10 --- 10 10 --- 10

D14 V LIN+- -128 ~ +127 --- 0 --- --- 0 ---

D15 H SIZE 0 ~ 63 38 --- 38 33 --- 33

D16 H SIZE+- -128 ~ +127 --- 0 --- --- 0 ---

D17WVMT TOP0 ~ 3010010

D18WVMT BTM0 ~ 3010010

D19 EWCR TOP 0 ~ 31 14 --- 14 12 --- 12

D20 EWCR T+- -128 ~ +127 --- 0 --- --- 0 ---

D21 EWCR BTM 0 ~ 31 13 --- 13 14 --- 14

D22 EWCR B+- -128 ~ +127 --- 0 --- --- 0 ---

D23 EW PARA 0 ~ 63 42 --- 42 31 --- 31

D24 EW PARA+- -128 ~ +127 --- -15 --- --- -15 ---

D25 V EHT 0 ~ 7 0 --- 0 0 --- 0

D26 V EHT+- -128 ~ +127 --- 0 --- --- 0 ---

D27 H EHT 0 ~ 7 0 --- 0 0 --- 0

D28 H EHT+- -128 ~ +127 --- 0 --- --- 0 ---

D29 TRAPEZ 0 ~ 63 30 --- 30 31 --- 31

D30 TRAPEZ+- -128 ~ +127 --- 0 --- --- 0 ---

D31V AGC0 ~ 1000000

D32BLANK SW0 ~ 1000000

D33VRMP BI0 ~ 1000000

Setting

item

Variable

range

4:3 16:9 4:3 4:3 16:9 4:3

AV-27F475/S
AV-27F485/S

RF EXTERNAL RF EXTERNAL

AV-27F475/Z
AV-27F485/Z

(No.YA053)1-19

4.7.3 [3. SOUND(A)]

No.

A01 IN LEVEL 0 ~ 15 9

A02 LOW SEP 0 ~ 63 41

A03 HI SEP 0 ~ 63 36

A04 SAPC 0 ~ 1 0

A05 BBE BASS -128 ~ +127 +6

A06 BBE TRE -128 ~ +127 +6

A07 AHS MVE -128 ~ +127 ±0

A08 AHS MSC -128 ~ +127 ±0

4.7.4 [4. OTHERS(F)] [Do Not adjust : All fixed]

No.

F01 OSD POSI 0 ~ 255 39 37

F02 OSD FREQ 0 ~ 255 90 90

F03 CCD POSI 0 ~ 255 42 39

F04 CCD FREQ 0 ~ 255 91 91

F05 CCD CONT 0 ~ 63 4 4

F06 PUR WBCK 0 ~ 1 0 0

F07 PUR CONT 0 ~ 63 2 2

F08 CCD PCHK 0 ~ 1 1 1

F09 VMOFF 0 ~ 1 0 0

F10 VNR CHK 0 ~ 255 3 3

F11 VCSN TM 0 ~ 255 5 5

F12 VM DAT A -128 ~ +127 +127 8

F13 VM DAT B -128 ~ +127 +8 -8

F14 VM DAT C -128 ~ +127 -8 -20

F15 VM DAT D -128 ~ +127 -20 -32

F16 VM DAT E 0 ~ 1 1 1

F17 XDSID TM 0 ~ 255 15 15

F18 FM TRAP 0 ~ 1 0 0

Setting

item

Setting

item

Variable

range

Variable

range

Initial setting value

Initial setting value

AV-27F475/S
AV-27F485/S

AV-27F475/Z
AV-27F485/Z

4.7.5 [5. 3L Y/C(LYC)] [Do not adjust : All fixed]

No.

LYC01 MODE 0 ~ 7 4

LYC02 VENH 0 ~ 7 1

LYC03 PDSOFF 0 ~ 1 0

LYC04 CB 0 ~ 1 0

LYC05 VNLR 0 ~ 15 2

LYC06 GSEL0 0 ~ 1 0

LYC07 GSEL1 0 ~ 1 1

LYC08 COR 0 ~ 3 0

LYC09 TRAP 0 ~ 1 1

LYC10 CHTRAP 0 ~ 1 0

LYC11 CBPF 0 ~ 1 0

LYC12 ENHOFF 0 ~ 1 0

4.7.6 [12. SYSTEM(SYS)] [Do not adjust : All fixed]

No.

SYS01 VIDEO IN 0 ~ 4 3 3

SYS02 VSM 0 ~ 1 1 1

SYS03 CLR TEMP 0 ~ 1 1 1

SYS04 THEATER 0 ~ 1 1 1

SYS05 THEA PRO 0 ~ 1 1 1

SYS06 GAME MD 0 ~ 1 0 0

SYS07 AHS 0 ~ 1 0 1

SYS08 HYPER SR 0 ~ 1 1 0

SYS09 BBE 0 ~ 1 1 1

SYS10 S SOUND 0 ~ 1 1 1

SYS11 16:9 MD 0 ~ 3 1 1

SYS12 S CCD 0 ~ 1 0 1

SYS13 ID DISP 0 ~ 1 1 1

SYS14 CH LAB 0 ~ 1 1 1

SYS15 V LAB 0 ~ 1 1 1

SYS16 W CLOCK 0 ~ 1 1 1

SYS17 PIM 0 ~ 1 1 1

SYS18 PURITY 0 ~ 1 0 0

SYS19 VOL MUTE 0 ~ 1 1 1

SYS20 VCHIP 0 ~ 1 1 1

SYS21 VCHIP CA 0 ~ 1 1 1

SYS22 CCD 0 ~ 1 1 1

SYS23 HYPSCAN 0 ~ 1 1 1

SYS24 JVC LOGO 0 ~ 1 1 1

SYS25

Setting

item

Setting

item

PANORAMA

Variable

range

Variable

range

0 ~ 1 0 0

Initial setting value

Initial setting value

AV-27F475 AV-27F485

1-20 (No.YA053)