JVC AVN65P74 - Service Manual Immediate Download

SERVICE MANUAL

No.52126

2003/04

AV-N65P74

REAR PROJECTION TELEVISION

52126

2003

AV-N65P74/HA

TABLE OF CONTENTS

PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-24

TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-67

BASIC CHASSIS

SB3

AV-N65P74

1-2 (No.52126)

SPECIFICATION

Design & specifications are subject to change without notice.

Items

Contents

Dimensions (W x H x D)

156.6cm x 149.5cm x 72.8cm

Mass

111 kg

TV RF System

Color System

Sound System

CCIR (M)

NTSC

BTSC System (Multi Channel Sound)

TV Receiving Channels and

Frequency

VL Band

VH Band

UHF Band

(02~06) 54MHz~88MHz

(07~13) 174MHz~216MHz

(14~69) 470MHz~806MHz

CATV Receiving Channels and

Frequency

Low Band

High Band

Mid Band

Super Band

Hyper Band

Ultra Band

Sub Mid Band

54MHz~804MHz

(02~06, A-8) by (02~06 & 01)

(07~13) by (07~13)

(A~1) by (14~22)

(J~W) by (23~36)

(W+1~W+28) by (37~64)

(W+29~W+84) by (65~125)

(A8, A4~A1) by (01, 96~99)

TV/CATV Total Channel

180 Channels

Antenna Terminal (VHF/UHF)

75ohm unbalanced F-type connector

Intermediate Frequency

Video IF Carrier

Sound IF Carrier

45.75MHz

41.25MHz (4.5MHz)

Color Sub Carrier

3.58MHz

Power Input

Power Consumption

AC120V, 60Hz

248W (Max)

Screen

Screen Size

Projection Tube

High Voltage

Transparent screen (unitized fresnel lens/double lenticular lens)

65" (165cm) Measured diagonally, 16:9 ratio (W:143.9 cm, H:81.0 cm)

17cm (6.7") tube x 3 ( R/G/B )

31kV±1.0kV (at zero beam current)

Speaker

Audio Power Output

16cm round x 2 (Woofer), 5.5cm round x 2 (Tweeter)

10W+10W

External Input

Video

Audio

S-Video

Component Video

1V (p-p), 75ohm (RCA pin jack x 4)

500mV(rms) ( -4dBs), high impedance (RCA pin jack x 8)

Y: 1V (p-p) positive, 75ohm negative sync provided

C: 0.286V(p-p) (burst signal)

Mini-DIN 4pin connector x 2

Y: 1V (p-p), 75ohm (RCA pin jack x 2)

Pb: ±0.35V(p-p), 75ohm (RCA pin jack x 2)

Pr: ±0.35V(p-p), 75ohm (RCA pin jack x 2)

1080i DTV (digital broadcast) ready

Digital Input

Audio Input

DVI-D signal link 19pin connector

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

500mV(rms) ( -4dBs), high impedance (RCA pin jack x 2)

Subwoofer Output

More than 0 to 1000mV (rms) (+2.2dBs) (RCA pin jack x1)

Audio Output (VARI/FIX)

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

FIX : 500mV(rms) (-4dBs), low impedance (1kHz when modulated 100%)

(RCA pin jack x 2)

Speaker Input

45W 16ohm (maximum input)

AV Compulink lll

Ø3.5mm mini jack

Remote Control Unit

RM-C1200G (AA/R6/UM-3 battery x 2)

AV-N65P74

(No.52126)1-3

SECTION 1

PRECAUTIONS

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 that 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

(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 with a measuring

apparatus

(oscilloscope

etc.)

the

LIVE

side

GND

and

ISOLATED(NEUTRAL) side GND or EARTH side GND at the same

time.

If above note will not be kept, a fuse or any parts will be broken.

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

the B1 setting should be checked or adjusted (See ADJUSTMENT

OF B1 POWER SUPPLY).

(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

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, screwheads, 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

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 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 ohms per volt or more sensitivity in

the following manner. Connect a 1500ohm 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.).

(11) High voltage hold down circuit check.

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".

AC VOLTMETER

(HAVING 1000 /V,

OR MORE SENSITIVITY)

PLACE THIS PROBE

ON EACH EXPOSED

METAL PART

1500

10W

0.15 F AC-TYPE

GOOD EARTH GROUND

PWB

White line side

WHT

POWER CORD

REPLACEMENT WARNING.

Connecting the white line side of power

cord to "WHT" character side.

This mark shows a fast

operating fuse, the

letters indicated below

show the rating.

AV-N65P74

1-4 (No.52126)

1.2 INSTALLATION

1.2.1

REMOVING THE UPPER UNIT FROM THE LOWER UNIT

1.2.1.1

TYPES AND PLACES OF SCREWS

· Be careful not to confuse the following four types of screws.

Type

Ref.

Place for attaching screws

Quantity

Color

Shape

diameter of 4mm-length of 18mm, acute tip

diameter of 3mm-length of 12mm, flat tip

diameter of 4mm-length of 12mm, flat tip

diameter of 4mm-length of 20mm, flat tip

Black

Gold

Black

Rear cover (for attaching the speaker panel)

FRONT SIDE

REAR SIDE

A : diameter of 4mm - length

of 18mm, black, acute tip

A : diameter of 4mm - length

of 18mm, black, acute tip

C : diameter of 4mm - length

of 12mm, gold, flat tip

D : diameter of 4mm - length

of 20mm, black, flat tip

B : diameter of 3mm - length

of 12mm, black, flat tip

Rear cover (for attaching the body bracket)

Inside the Front door (in the jack part)

Rear cover (for attaching the body)

Rear cover bracket

Front panel bracket

A : diameter of 4mm - length

of 18mm, black, acute tip

A : diameter of 4mm - length

of 18mm, black, acute tip

D : diameter of 4mm - length

of 20mm, black, flat tip

AV-N65P74

(No.52126)1-5

1.2.1.2

DISASSEMBLY PROCEDURE

· Make sure that the power cord is pulled out from the AC wall

socket.

(1) Remove the 2 screws [ A ] on the left rear side of the set,

and then remove the rear cover bracket. [Fig.1]

(2) Remove the 2 screws [ B ] inside of the front door. [Fig.2]

* The screws attach the speaker panel.

(3) Remove the 2 screws [ D ] on the left edge of the rear

cover, and remove the 2 screws [ D ] on the right edge of

the rear cover. [Fig.2]

* The screws attach the speaker panel.

(4) Pull the speaker grill in front direction, and remove the

speaker grill. [Fig.2]

(5) Remove the connector [CN00Z] for the auto-convergence

sensor on the left side of the set, and the clamp fixing the

wire. [Fig.2]

(6) Remove the 2 screws [ A ] on the left front panel bracket,

and remove the 2 screws [ A ] on the right front panel

bracket. [Fig.2]

(7) Remove 1 screw C on the left edge of the rear cover, and

1 screw C on the right edge of the rear cover. [Fig.3]

(8) Remove 1 screw [ A ] on the left side of the rear cover, and

remove 1 screw [ A ] on the right side of the rear cover.

[Fig.3]

(9) Move the rear cover approx. 3cm in rear direction. Then,

remove the upper unit from the lower unit by lifting the

upper unit slowly. [Fig.3]

·VOID seal [ a ] attached to the left front panel bracket in

order to confirm that a person except JVC installation

workers has disassembled the set. This seal is removed

when the upper unit is removed, and the letters of "VOID"

appears in the place where the seal. [Fig.2]

· Two or more people are required to move the upper unit.

· Reflecting mirror is attached to the upper unit. So, handle

it carefully so as to protect it from shocks.

· In placing the upper unit on the ground, be careful not to

insert the connector for the auto-convergence on the

right side of the upper unit between the upper unit and

the ground.

· In placing the upper unit on the ground, be careful not to

insert dust inside the upper unit.

· Be careful not to hurt yourself because metal brackets for

attaching the front panel are on the ceiling part of the

lower unit.

(10) Cover the lower unit with the Top Sheet in order not to

insert dust in the lower unit. Top Sheet is the one used for

package. [Fig.4]

Fig.1

Fig.2

Fig.3

Fig.4

REAR COVER

BRACKET

SPEAKER GRILL

CN00Z

UPPER

UNIT

LOWER

UNIT

TOP SHEET