JVC AV-32DF74/YA, AV-36DF74/YA Service Manual

52156200310

SERVICE MANUAL

COLOR TELEVISION

AV-32DF74 /YA,

TVCATV VCR

DVD

ASPECT

MULTI SCREEN

INDEX

FREEZE

SELECT

SWAP

INPUT1

123

INPUT2

456

INPUT3

7809

INPUT4

THEATER

NATURAL

DIGITAL-IN

PRO

CINEMA

SLEEP TIMER

DISPLAY SOUND

MUTING C.C.

VOL

VCR CHANNEL

VCR / DVD

PREV NEXT POWER

REW

PLAY FF

REC

STOP PAUSE

OPEN/CLOSE STILL/PAUSE

AV-36DF74

/YA

BASIC CHASSIS

SB4

POWER

EZ SURF

PIP/MOVE

RETURN

/TV

VIDEO

STATUS

LIGHT

VOL

EXIT

BACK

TV/VCR

TABLE OF CONTENTS

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

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

3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-51

No.52156

2003/10

SPECIFICATION

Items

Dimensions ( W × H × D ) 93.9cm × 68.5cm × 57.0cm

(37" × 27" × 22-1/2") Mass 67.0 kg (147.4 lbs) 89.0 kg (195.8 Ibs) 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 215W (Max) Picture Tube (Visible size) 80cm (32") (Diagonally)

High Voltage 32kV+1kV/-1.3kV (at zero beam current) Speaker 6.5cm × 13cm (2-1/2" × 5"), Oval type × 2 Audio Power Output 10W × 10W Antenna terminal (VHF/UHF) F-type connector, 75Ω unbalanced, coaxial Video / Audio input S-Video

Component Video

Digital-in Video

Audio output

Subwoofer output More than 0 to 1000mV (rms) (+2.2dBs),

Speaker input 16Ω, 20W (rms) AV compulink III 3.5mm mini jack × 1 Remote Control Unit RM-C1201G (AA/R6/UM-3 battery × 2)

Design & specifications are subject to change without notice.

VHF Low

VHF High

UHF

CATV

Sound IF

[INPUT-1/3/4]

Video Audio

[INPUT-1/2]

1125i / 750p

525p / 525i

Audio

Variable

Fix

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 65~94, 100~125

Sub Mid Band : A4~A1 by 96~99

45.75 MHz

41.25 MHz (4.5MHz)

H:65.6cm × W:49.6cm (25-7/8" × 19-5/8")

Mini-DIN 4 pin × 3

Y: 1V (p-p), Positive (Negative sync provided), 75 Ω

C: 0.286V (p-p) (Burst signal), 75 Ω

1V (p-p), Positive (Negative sync provided), 75 Ω, RCA pin jack × 4

500mV (rms), High impedance, RCA pin jack × 8

RCA pin jack × 6

Y : 1V (p-p) (Sync signal: 0.35V(p-p), 3-value sync.), 75 Ω

Pb/Pr : 0.35V(p-p), 75 Ω

Y : 1V (p-p), Positive (Negative sync provided), 75 Ω

Pb/Pr : 0.35V(p-p), 75 Ω

DVI-D 24-pin connector × 1

(Digital-input terminal is not compatible with computer signal)

500mV (rms), Low impedance, RCA pin jack × 2

RCA pin jack × 2

More than 0 to 1000mV (rms) (+2.2dBs)

500mV(rms), (-4dBs), low impedance (400Hz when modulated 100%)

low impedance (400Hz when modulated 100%), RCA pin jack × 1

AV-32DF74 AV-36DF74

Contents

102.3cm × 75.6cm × 61.3cm (40-3/8" × 29-7/8" × 24-1/4")

90cm (36") (Diagonally) H:74.0cm × W:55.9cm (29-1/4" × 22-1/8")

1-2 (No.52156)

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 cir cuitry of the pr oducts shou ld n ot 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 me chanical 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 w hich 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 part s 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 L IVE : ( ) 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 measu re 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 10k

(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.

Ω 2W resistor to the anode button.

(10) Isolation Check (Safety fo r 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 1000 following manner. Connect a 1500 a 0.15

µF AC-type capacitor between an exposed metal part

Ω per volt or more sensitivity in the

Ω 10W resistor paralleled by

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 METAL PART

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

(No.52156)1-3

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

2.1 FEATURES

 Built-in D.I.S.T. (Digital Input Scanning Technology) system.

The D.I.S.T. is the function to change a input visual signal into the high definition 1080 interlace signal

 Multi screen function

• Picture in Picture Back programs can be seen at once.

• Contents index. A favorable program can be selected from the 9 preview PIPs on the screen.

 Provided with 2 tuners and 2 aspect (16:9 & 4:3) mode.  Multifunctional remote control permits picture adjustment.  The CH.GUARD function prevents the specific channels from

being selected, unless the "ID number" is entered.

 I2C bus control utilizes single chip ICs.  Adoption of the VIDEO STATUS function.

• The VIDEO STATUS key gives you a choice of 4 picture display settings, including a display of your own preferences.

STANDARD DYNAMIC THEATER GAME

 Digital-in

To receive digital broadcasts. Digital-in will display when any picture signal (480i/ 480p, 720p/ 1080i) in Digital-in is displayed.

 Natural Cinema

Watching the movie or animation, press the Natural Cinema to adjust the out line of the images to make thin more sharp.

 Built-in V-CHIP system.

• This TV is equipped with V-CHIP technology which enables TV parental guidelines and movie guideline controls.

 Closed-caption broadcasts can be viewed.  Built-in MTS (Multi-channel Television Sound) system.

In addition to mono or stereo sound, an MTS broadcast may also include a Second Audio Program (SAP).

 Built-in A.H.S system & BBE sound system.  S-VIDEO input terminal for taking best advantage of Super

VHS.

 3D Digital comb filter improves picture quality.  Plug-in menu

The plug-in menu comes up automatically when you first turn on the TV after plugging it in.

2.2 DIGITAL-IN TERMINAL FUNCTIONS

Pin No.

Pin name

RX2-

RX2+

GND2/ 4

RX4-

RX4+

SCL

SDA

RX1-

RX1+

GND1/3

RX3-

Pin No.

Pin name

GND

HTPLG

RX0-

RX0+

GND0/5

RX5-

RX5+

GNDC

TXC+

TXC-

PIN ASSIGNMENTPIN NAME

1-4 (No.52156)

RX3+

2.3 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-32DF74

or AV-36DF74

AC 120V 60Hz

TV SCREEN SIZE : DIAGONAL

CHASSIS NO. MANUFACTURED SERIAL NO.

INCHES

VIDEO EQUIPMENT

4C43

DISTINGUISH NAME

2.4 MAIN DIFFERENCE LIST Item AV-32DF74 AV-36DF74

MODEL NO.

CRT (Picture tube) size

Dimensions (W × H × D)

32V(Diagonally) (H: 65.6cm × W: 49.6cm)

93.9cm × 68.5cm × 57.0cm

(37” × 27” × 2-1/2”) Mass (kg/lbs) 67.0 kg (147.4 Ibs) 89.0 kg (195.8 Ibs) MAIN PWB ASS’Y SSB-1074A-M2 SSB-1075A-M2 DEF & POWER PWB ASS’Y SSB-2074A-M2 SSB-2075A-M2 MI-COM & DIST MODULE PWB ASS’Y SSB0D074A-M2 SSB0D075A-M2 CRT SOCKET PWB ASS’Y SSB-3074A-M2 SSB-3075A-M2 LINE FILTER PWB ASS’Y SSB-9074A-M2 SSB-9075A-M2 DEF OSC PWB ASS’Y SSB0H074A-M2 SSB0H075A-M2 FRONT CONTROL PWB ASS’Y SSB0L074A-M2 SSB0L075A-M2 DIGITAL INPUT MODULE PWB ASS’Y SSB-7974A-M2 SSB-7975A-M2 Purity adjustment function Non function On display

36V(Diagonally) (H: 74.0cm × W: 55.9cm)

102.3cm × 75.6cm × 61.3cm (40-3/8” × 29-7/8” × 24-1/4”)

(No.52156)1-5

2.5 TECHNICAL INFORMATION

2.5.1 SYSTEM BLOCK DIAGRAM

RECEIVER PWB

SCL2

IC0201

MTS/VOL/

TONE

SDA2

TU0102

MAIN U/V

TUNER

IC0701

LATCH

DEF OSC PWB

IC0161

DEF

CORRECTION

IC0212

LATCH

SCL0 SDA0

MI-COM & DIST MODULE PWB

IC1701

MI-COM

SCL4 SDA4

SCL2 SDA2

SCL1 SDA1

SCL0 SDA0

IC1001

DIST

PROCESS

SCL3

IC3001

3D Y/C SEP &

CHROMA

DECODER

SDA3

Q1713

Q1712

IC1301

RGB

PROCESSOR

SCL0 SDA0

SCL1 SDA1

MAIN PWB

IC1703

MEMORY

TU1101

SUB U/V

TUNER

IC1211

SYNC

SW/DET.

IC1301

COMPONENT SW

IC1501

SELECT

IC1502

LATCH

FRONT CONTROL PWB

IC1704

LATCH

SCL0 SDA0

DIGITAL INPUT MODULE PWB

SCL0

IC001

FORMAT CONVERT

SDA0

IC3001

2D Y/C SEP &

CHROMA

DECODER

1-6 (No.52156)

2.5.2 MAIN MICRO COMPUTER (CPU) FUNCTION

(MN102H75KPD)

Pin No.

Pin name Function

/VSYNC

LB_PRO

/RST

/TEST

SDA4

A_MUTE

/HSYNC

OSDXI

OSDXO

SDA2

AC_IN

SCL2

/TU_POW

VCOI

PDO

/IP_RESET

LED_POWER

VREF

IP_ERR

IREF

COMP

AVD D

CLL

VREFLS

SUB_CCD

VSS

MAIN_CCD

VREFHS

CLH

VDD

SCL4

I/O

V. sync for OSD

Low B protect detection [Detect : H]

CPU reset [Reset : L]

Operation test for CPU

Ys (blanking) for OSD

I/O

I C bus (data) for DIST

Audio muting [Muting :H]

H.sync for OSD

Keep for OSD oscillation

I/O

I C bus(data) for MTS

AC(60Hz) for timer clock

I C bus (clock) for MTS

LPF

Reset for DIST [Reset : L]

YM (transparence) for OSD

OSD blue

Lighting for POWER LED [Lighting : H]

OSD green

OSD red

Reference voltage for OSD

AMDP program load error detection

Reference current for OSD

Phase adjust for OSD

+3.3V

For Low clamp level

Reference voltage in for sub CCD

Composite video for sub CCD

GND

Composite video for main CCD

Reference voltage in for main CCD

For High clamp level

+3.3V

I C bus (clock) for DIST

Pin No.

CLK_SW

LED_ON_TIMER

SBT1

ABL/ACL

CHROME

DC_COTL

AFC_1

/LOB_POW

/COMPLINK

/POWERGOOD

/MECA_ON

/MAIN_POW

/B1_POW

AFC2

X-RAY

KEY2

KEY1

SCL1

SDA1

REMO

VSS

OSC2

OSC1

VDD

SCL0

SDA0

P MUTE

Pin name Function

I/O

IP clock switch control

Use for on board writing [for factory]

ABL/ACL control

Chroma / Gamma control

Black level DC reproduce control

Sub AFT voltage

LOB power control [Power on : L]

AV compulink control

Power condition check

Power SW interrupt [Pushing :L]

Main power control [Power on : L]

B1 power control [Power on : L]

Main AFT voltage

X-ray protect detection [protect : 0.7V]

Key scan for front key (CH+,Vol-/+)

Key scan for front key (Menu,CH-)

I C bus (clock) for main memory

I/O

I C bus (data) for main memory

Remote control

GND

System clock oscillation (4MHz)

+3.3V

I C bus (clock) for generally

I/O

I C bus (data) for generally

Picture muting

(No.52156)1-7

2.6 FUNCTIONS z FRONT PANEL

INPUT-4 terminals(S-Video,Video,Audio L/MONO /R) MENU button OPERATE button (for MENU) CHANNEL -/+ buttons VOLUME -/+ buttons Sensor (for remote control unit) POWER & ON TIMER lamp POWER(Main) button

INPUT- 4

OVER

VIDEO

S-VIDEO L / MONO - AUDIO - R

z AV TERMINAL (REAR)

SPEAKER INPUT 16 20W RMS

SUBWOOFER OUT

4 5 6

OPERATE

321

VOLUMECHANNEL

Antenna (VHF/UHF) terminal

ON TIMER

POWER

8765

AUDIO OUT (L/R) terminal

SUBWOOFER OUT terminal

AUDIO

VIDEO

DIGITAL-IN

INPUT-1INPUT-2

INPUT-3 terminal (S-Video / Video /Audio L/R) INPUT-2 terminal (Video/Audio L/R) INPUT-1 terminal (S-Video / Video /Audio L/R) AV COMPULINK jack

COMPONENT VIDEO INPUT-2 terminal (Y/Pb/Pr) COMPONENT VIDEO INPUT-1 terminal (Y/Pb/Pr) DIGITAL-IN terminal

[VIDEO IN (DVI 24pin), AUDIO L/R IN]

SPEAKER INPUT terminal

1-8 (No.52156)

7 8 9 10

z REMOTE CONTROL (RM-C1201G)

1 2 3 4

TV CATV VCR

MULTI SCREEN

FREEZE

INPUT1

INPUT2

INPUT3

INPUT4

DIGITAL-IN

SLEEP TIMER

MUTING C.C.

VOL

VCR CHANNEL

PREV NEXT POWER

REW

REC

OPEN/CLOSE STILL/PAUSE

DVD

ASPECT

INDEX

SELECT

SWAP

123

456

7809

THEATER

NATURAL

PRO

CINEMA

DISPLAY SOUND

VOL

VCR / DVD

PLAY FF

STOP PAUSE

RM-C1201G

POWER

EZ SURF

PIP/MOVE

RETURN

VIDEO

STATUS

LIGHT

BACKMENU

TV/VCR

/TV

TV / CATV switch

VCR / DVD switch

ASPECT key:

POWER key

MULTI SCREEN keys:

4:3 16:9 V STRETCH

(INDEX, EZ SURF, FREEZ, SWAP, SELECT, PIP/MOVE keys)

INDEX key: 9 screen mode

EZ SURF key:

PIP/MOVE key: PIP screen can be bispalyed.

Input select keys:

Back program can be displayed.

can be displayed.

(INPUT1, INPUT2, INPUT3, INPUT4, DIGITAL-IN)

THEATER PRO key

SLEEP TIMER key:

DISPLAY key

MUTING key (memory key

VOL+/- & VOL /

MENU key

VCR / DVD

channel number keys

100+ key

RETURN+/TV key

NATURAL CINEMA

VIDEO STATUS key:

LIGHT key

SOUND key:

C.C. (CLOSED CAPTION) key:

CH+/- & CH /

BACK key

NOTE

CONTROL

The CH+/- keys and VOL+/- keys operate CHANNEL and

0 15 30 165 180

for SERVICE MENU

(for SERVICE MENU)

keys

AOUT ON OFF

key:

STANDARD DYNAMIC THEATER GAME

MOVIE MUSIC OFF

A.H.S: and BBE ON/OFF can be set

OFF CAPTION TEXT

(for SERVICE MENU)

keys

VOLUME normally. These keys are also used to navigate SERVICE MENU as the CH / and VOL / keys.

)

(No.52156)1-9

SECTION 3

DISASSEMBLY

3.1 DISASSEMBLY PROCEDURE

3.1.1 REMOVING THE REAR COVER

• Unplug the power supply cord. (1) Remove the 13 screws [A] as shown in Fig.2. (2) Remove the REAR COVER toward you.

NOTE:

When reinstalling the REAR COVER, carefully push it inward after inserting the chassis into the REAR COVER groo ve .

3.1.2 REMOVING THE AV TERMINAL BOARD

• Remove the REAR COVER. (1) Remove the 6 screws [B] as shown in Fig.2. (2) When you pull out the AV TERMINAL BOARD in the

direction of arrow [a] as shown in Fig.2, it can be removed.

3.1.3 REMOVING THE CHASSIS

• Remove the REAR COVER. (1) Slightly raise the both sides of the CHASSIS by hand and

remove the 2 claws under the both sides of the CHASSIS from the front cabinet.

(2) Draw the CHASSIS backward along the rail in the arrow

direction [a] as shown in Fig.2. (If necessary, take off the wire clamps, connectors etc.)

NOTE:

When conducting a check with power supplied, be sure to confirm that the CRT earth wire is connected to the CRT SOCKET PWB and MAIN PWB or DEF & POWER PWB.

3.1.4 REMOVING THE CONTROL BASE

• Remove the REAR COVER. Remove the CHASSIS. (1) While pushing down the claws [b] as shown in Fig.1. (2) Remove the CONTROL BASE in the arrow direction

marked [c]. ( If necessary, take off the wire clamps, connectors etc. )

3.1.5 REMOVING THE SPEAKER / SPEAKER HOLDER

• Remove the REAR COVER. (1) Remove the 2 screws [C] as shown in Fig.2, then remo ve

the SPEAKER HOLDER toward you. (2) Remove the 2 screws [D] as shown in Fig.2. (3) Draw the SPEAKER toward you. (4) Follow the same steps when removing the other hand

SPEAKER.

3.1.6 REMOVING THE DIGITAL INPUT MODULE PWB

• Remove the REAR COVER

• Remove the AV TERMINAL BOARD. (1) Remove the 2 screws [E] as shown in Fig.2. (2) Remove the DIGITAL INPUT MODULE PWB in the arrow

direction [d].

NOTE:

If necessary, take off the wire clamps, connectors etc.

3.1.7 CHECKING THE PW BOARD

• To check the backside of the circuit board. (1) Pull out the CHASSIS. (Refer to REMOVING THE

CHASSIS).

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

the backside of the PW Board.

CAUTION:

• When erecting the CHASSIS, be careful so that there will be

no contact with other PWB.

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

wire and other connectors are properly connected.

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.

AV-36DF74/YA

DIGITAL INPUT MODULE

POWER CORD

1-10 (No.52156)

32DF74CP-S

36DF74CP-S

TERMINAL BOARD

SSB-7874A-M2 AV-32DF74/YA

SSB-7875A-M2

CLAW

CHASSIS BASE

CAUTION AT DISASSEMBLY

WJJ0247-001A (short jumper)

3 5

SB connector

wire

4 6

Prior to disassembly, unplug the power cord from the wall outlet without fail. (Turn the power “off”.)

Short the SB connector (1) pin and (2) pin of the digital input unit. (At the time of assembling) Before the rear cover is inserted into the cabinet, release the short-circuit between the SB connector (1) pin and (2) pin of the digital input unit. After releasing the short-circuit between the SB connectors, do not turn the power on until the rear cover is inserted into the cabinet.

Negligence in carrying out the above steps may cause the inactivation of the TV.

CONTROL BASE

Fig.1

AV-32DF74 AV-36DF74

FRONT CABINET

LINE FILTER PWB

FRONT SW PWB

CONTROL BASE

Fig.1

CLAW

MAIN PWB

CRT SOCKET PWB

( x 2)

SPEAKER HOLDER

FRONT CONTROL PWB

MI-COM & DIST MODULE PWB

RECEIVER PWB

SPEAKER

SPACER

DEF OSC PWB

CLAW

( x 2)

FRONT CABINET

DEF & POWER PWB

FBT

CHASSIS

( x 2)

CRT SOCKET PWB

DIGITAL INPUT MODULE PWB

AV TERMINAL BOARD

REAR COVER

Fig.2

( x 6)

POWER CORD

NOTE

This exploded view describes about the AV-32DF74. You can use the exploded view for disassembling the AV-36DF74 in the same step as for this one.

( x 13)

(No.52156)1-11

3.1.9 REMOVING THE CRT (PICTURE TUBE) NOTE:

• Replacement of the CRT should be performed by 2 or more persons.

• After removing the REAR COVER, CHASSIS etc.,

(1) Putting the CRT change table on soft cloth, the CRT

change table should also be covered with such soft clo th (shown in Fig. 3).

(2) While keeping the surface of CRT down, mount the TV set

on the CRT change table balanced will as shown in Fig. 3.

(3) Remove 4 screws marked by arrows with a box type

screwdriver as shown in Fig. 4.

NOTE:

Since the cabinet will drop when screws have been removed, be sure to support the cabinet with hands.

(4) After 4 screws have been removed, put the cabinet slow ly

on cloth (At this time, be carefully so as not to damage the front surface of the cabinet) shown in Fig. 5.

NOTE:

• The CRT should be assembled according to the opposite sequence of its dismounting steps.

• The CRT change table should preferably be smaller that the CRT surface, and its height be about 35cm.

COATING OF SILICON GREASE FOR ELECTRICAL INSULATION ON THE CRT ANODE CAP SECTION.

Subsequent to replacement of the CRT and HV transformer or repair of the anode cap, etc. by dismounting them, be sure to coat silicon grease for electrical insulation as shown in Fig.6.Wipe around the anode button with clean and dry cloth. (Fig.6)Coat silicon grease on the section around the anode button. At this time, take care so that any silicon greases dose not sticks to the anode button. (Fig.7)

CAUTION FOR DEGAUSSING WORKS

Whenever degaussing works are required due to distorted images and colors caused by the replacement of the CRT or other external magnetic forces, self-degaussing (internal degaussing) should be carried out without fail instead of degaussing the monitor from the outside. Because of the characteristics of the CRT used in this monitor , the distorted images and colors may worsen if degaussing the monitor from the outside has been performed. Even if external degaussing works have been carried out, self-degaussing should be performed by turning the power on the monitor. When you want to perform self-degaussing of the monitor whose power is already turned on, turn of f the power and wait for about 10 minutes before turning the power on the monitor again for self-degaussing.

CRT CHANGE TABLE

CLOTH

Fig.3

CRT

CRT CHANGE TABLE

Fig.4

CABINET

CRT CHANGE T ABLE

Fig.5

Silicon grease product No. KS - 650N

CRT

Anode button

Silicon grease

coating

Fig.6

Approx. 20mm (Do not coat grease on this section

Silicon grease should be coated by 5mm or more from the outside diameter of anode cap.

CRT

APPROX. 35cm

BOX TYPE SCREW DRIVER

1-12 (No.52156)

Anode button (No sticking of silicon grease)

Fig.7

Coating position of silicon grease

Anode cap

3.2 MEMORY IC REPLACEMENT

3.2.1 MEMORY IC

This model uses a memory IC. This memory IC stores data for proper operation of the video and deflection circuits. When replacing the memory IC, be sure to use an IC containing this (initial value) data.

3.2.2 MEMORY IC REPLACEMENT PROCEDURE

(1) Power off

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

(2) Replace the memory IC

Initial value must be entered into the new IC.

(3) Power on

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

(4) SERVICE MENU setting

Before entering the SERVICE MENU, confirm that the setting of TV/CATV SW of the REMOTE CONTROL UNIT is at the "TV" side and the setting of VCR/DVD SW of the REMOTE CONTROL UNIT is at the "VCR" side. If the switches have not been properly set, you cannot enter the SERVICE MENU.

a) Press [SLEEP TIMER] key and while the indication of

SLEEP TIMER 0 MIN is being displayed, press [DISPLAY] key and [VIDEO STATUS] key on the remote control unit (Fig.2) simultaneously.

b) The SERVICE MENU screen as shown in Fig.1 is

displayed.

c) Verify what to set in th e SERVICE MENU, and set

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

d) Press the [BACK] key twice to return normal screen.

(5) Receive channel setting

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

(6) User settings

Check the user setting items according to the steps described in the after page. Where these do not agree, refer to the OPERATING INSTRUCTIONS (USER'S GUIDE) and set the items as described.

1.PICTURE/SOUND 7.

2.YC SEP 8.IP

3.WHITE BALANCE 9.DSD

4.MEMORY SETUP 0.HDMI

5.RF AFC

SERVICE MENU SELECT KEY

SLEEP TIMER key

MEMORY key

(MUTING)

Set value

VOL / key

MENU key

SERVICE MENU

TV/CATV

switch

TV CATV VCR

MULTI SCREEN

FREEZE

INPUT1

INPUT2

INPUT3

INPUT4

DIGITAL-IN

SLEEP TIMER

MUTING C.C.

VCR CHANNEL

PREV NEXT POWER

REW

REC

OPEN/CLOSE STILL/PAUSE

Fig.1

VCR/DVD

switch

DVD

ASPECT

INDEX

SELECT

SWAP

123

456

7809

THEATER

NATURAL

PRO

CINEMA

DISPLAY SOUND

VOL

VCR / DVD

PLAY FF

STOP PAUSE

RM-C1201G

POWER

EZ SURF

PIP/MOVE

POWER key

CHANNEL NUMBER keys

/TV

DISPLAY & VIDEO STATUS key

RETURN

VIDEO

STATUS

LIGHT

Select item

VOL

BACKMENU

TV/VCR

CH / key

BACK key

Fig.2

3.3 FACTRY SETTING VALUE

3.3.1 SERVICE MENU SETTING MODE

Setting Item Settings Item No. Setting Item Settings Item No.

1.PICTURE/SOUND (SOUND AND PICTURE SETTING) 5.RF AFC

Sound circuits (A) Fixed A01~A27 IF VCO adjustment Adjust

Refer to adjustment

Procedure Video circuits (S) Adjust S01~S99 8.IP Deflection circuits (D) Adjust D01~D32 DIST processing setting Fixed IPA001~IPA042 Factory setting items (F) Adjust F01~F70 9.DSD

2.YC SEP

YC separation setting

Fixed YCM001~YCS114 Fixed DSB001~DSB053 Fixed YCM001~YCS114 Fixed DSC001~DSC044

Digital super detail setting

Fixed DSA001~DSA053

3.WHITE BALANCE Fixed DSD001~DSD017

0.HDMI

White balance adjustment AdjustBRDRV R, DRV B

CUT R, CUT G, CUT B

Digital input processing setting

Fixed HDM001~HDM080

4.MEMORY SETUP Fixed RHD001~RHD170 Memory data edit Non adjust ---

(No.52156)1-13

3.3.2 FACTORY SETTING Setting item Setting value Setting item Setting value

POWER CHANNEL VOLUME INPUT DISPLAY NATURAL CINEMA ASPECT MODE VIDEO STATUS

SOUND A.H.S OFF

BBE ON

PIP SOURCE PIP POSITION

TINT COLOR PICTURE BRIGHT DETAIL

COLOR TEMPERATURE DIG. NOISE CLEAR VSM(Velocity scan modulation) ON PURITY [AV-36DF74 only] Center BASS

TREBLE BALANCE MTS

NTSC/ 480i / 480p system

Item

STANDARD 00 00 00 00 00 LOW OFF DYNAMIC 00 00 +30 00 +30 HIGH OFF THEATER 00 00 00 00 00 LOW OFF GAME 00 00 -10 00 00 HIGH OFF

1080i / 720p system

Item

STANDARD 00 00 00 00 00 LOW OFF DYNAMIC 00 00 +30 00 00 HIGH OFF THEATER 00 00 00 00 00 LOW OFF GAME 00 00 -10 00 00 HIGH OFF

TINT COLOR PICTURE BRIGHT DETAIL

Off CABLE-02 10 TV Off AUTO 4:3 DYNAMIC

CH-04 BOTTOM ( LEFT SIDE )

Refer to the following table

Center (00) Center (00) Center (00) STEREO

ON / OFF TIMER NO TV SPEAKER

AUDIO OUT CENTER CH INPUT DIGITAL-IN NOISE MUTING FRONT PANEL LOCK V1 SMART INPUT

LANGUAGE CLOSED CAPTION AUTO SHUT OFF XDS ID TILT CORRECTION

V-CHIP SET LOCK CODE AUTO DEMO

Setting value

ON FIX NO SIZE 1 ON OFF OFF

ENG OFF ( CC1 / T1 ) OFF OFF Center

OFF (0000) OFF

COLOR

TEMPERATURE

COLOR

TEMPERATURE

DIGI. NOISE

CLEAR

DIGI. NOISE

CLEAR

1-14 (No.52156)

3.4 REPLACEMENT OF CHIP COMPONENT

3.4.1 CAUTIONS

(1) Avoid heating for more than 3 seconds. (2) Do not rub the electrodes and th e 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.

3.4.2 SOLDERING IRON

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

3.4.3 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 al-

ternately 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

[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 sol-

der. 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 sol-

der.

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

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

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

NOTE :

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

(4) Then solder leads B and C.

(No.52156)1-15

SECTION 4

ADJUSTMENT

4.1 ADJUSTMENT PREPARATION

(1) You can make the n ecessar y ad justments fo r this u nit

with either the Remote Control Unit or with the adjustment tools and parts as given below.

(2) Adjustment with the Remote Control Unit is made on

the basis of the initial setting values, however, the new setting values which set the screen to its optimum condition may differ from the initial settings.

(3) Make sure that AC power is turned on correctly. (4) Turn on the power for set and test equipment before use,

and start the adjustment procedures after waiting at least 30 minutes.

(5) Unless otherwise specified, prepare the most suitable

reception or input signal for adjustment.

(6) Never touch any adjustment settin g value, which are

not specified in the list for this adjustment.

(7) Presetting before adjustment.

Unless otherwise specified in the adjustment instructions, preset the following functions wi t h th e re mote control unit:

Setting item Setting position

VIDEO STATUS STANDARD TINT, COLOR, PICTURE,

BRIGHT, DETAIL COLOR TEMPERATURE LOW DIG. NOISE CLEAR OFF NATURAL CINEMA AUTO BASS, TREBLE, BALANCE Center (00) A.H.S OFF BBE ON ASPECT MODE 4:3

Center (00)

4.2 MEASURING INSTRUMENT AND FIXTURES

(1) DC voltmeter (or digital voltmeter) (2) Oscilloscope (3) Frequency counter (4) Signal generator (Pattern generator)

[NTSC (480i) / 480p / 720p / 1080i / DIGITAL] (5) TV audio multiplex signal generator (6) Remote control unit

4.3 ADJUSTMENT ITEMS Adjustment items

1: B1 POWER SUPPLY 2: FOCUS 3: HORIZONTAL FREQUENCY 4: DEFLECTION CIRCUIT

V. POSITION / V. SIZE / V. LINEARITY adjustment H. WIDTH / H.POSITION / SIDE PIN / TRAPEZIUM

adjustment

5: VIDEO CIRCUIT

WHITE BALANCE (Low Light & High Light) adjustment

SUB BRIGHT / SUB CONTRAST adjustment SUB COLOR / SUB TINT / B-Y GAIN adjustment

6: MTS CIRCUIT

CAUTION

Never change the initial setting value any

adjustments except for those that are designated

in the adjustment procedures.

In case where you have made undesignated

adjustments by mistake, never press the MUTING

key on the remote control unit.

Whenever you had not pressed the MUTING key,

you would be able to recover the initial

switching the POWER SW (on/off) key.

1-16 (No.52156)

value by

+ 37 hidden pages