JVC AV-48WP30 Service Manual

SER VICE MANUAL

REAR PROJECTION TELEVISION

V-48WP30

BASIC CHASSIS

AV-48WP30

SB2

CONTENTS

SPECIFICATIONS

SAFETY PRECAUTIONS

FEATURES

FUNCTIONS

INSTALLATION

TECHNICAL INFORMATION

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････････････････････････

2 3 4 4 7 8

MAIN PARTS LOCATION

SPECIFIC SERVICE INSTRUCTIONS

SERVICE ADJUSTMENTS

TROUBLESHOOTING

PARTS LIST

★

OPERATING INSTRUCTIONS

★

STANDARD CIRCUIT DIAGRAM

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No.51914 Feb. 2002

9 10 19 51 53

2-1

V-48WP30

SPECIFICATIONS

Items Contents

Dimensions (W Mass TV RF System

Color System Sound System

TV Receiving Channels and Frequency

VL Band VH Band UHF Band

CATV Receiving Channels an d Frequenc y

Low Band High Band Mid Band Super Band Hyper Ban d Ultr a B a nd Sub Mid Band

TV/CATV Total C hannel Antenna Terminal Intermediate Frequency

Video IF Carrier

Sound IF Carrier Color Sub Carrier Power Input

Power Consumption Screen Screen Size Projection Tube High Voltage Speaker Audio Power Out put External Input

Audio Output Digital-Input

Speaker Input AV Compulink Remote Control Unit

××××H××××

Video Input

Audio Input

S-Video

Component Input

ⅢⅢⅢⅢ φ

120.0cm×124.4cm×60.9cm ( 47-1/4

81.0 kg (179.0 Ibs) CCIR (M)

NTSC BTSC System (Multi Channel Sound)

(02～06) 54MHz～88MHz (07～13) 174MHz～216MHz (14～69) 470MHz～806MHz

(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)

180 Channels 75Ω(VHF/UHF) F-type connector

45.75MHz

41.25MHz (4.5MHz)

3.58MHz 120V AC, 60Hz

248W Transparent screen (unitized fresnel lens / double lenticular lens)

(122cm) Measured diagonally, 16:9 ratio (W:106.3cm, H:59.8cm)

48 17cm (6.7 31kV±1.0kV (at z ero b eam cur r ent )

13cm round×2, φ5.5cm r ound×2

10W+10W

1Vp-p, 7 5Ω (RCA pin jack×4) 500mVrms ( -4dBs ), high impedance (RCA pin jack×8) Y: 1Vp-p positive (negative sync provided, when terminated with 75Ω) C: 0.286V Mini-DIN 4pin connector×2 P

Y: 1Vp-p 1080i DTV (digital broadcast) ready Fix : 500mVrms(-4dBs) low impedance (1kHz when modulated 100%)

DVI-D signal link 19pin connector (Digital-input terminal is not compatible with computer signal.)

45W 16Ω(max imum input)

3.5mm m in i jac k

RM-C322G (AA/R6/UM-3 b atter y×2)

) tube ×3 ( R / G / B )

(burst signal, when terminated with 75Ω)

p-p

: ±0.35Vp-p : ±0.35Vp-p

,75

(RCA pin jack×2)

,75

(RCA pin jack×2)

,75

(RCA pin jack×2)

×49×

(54MHz～804MHz)

)

No. 51914

SAFETY PRECAUTIONS

V-48WP30

1. The design of this product cont ains special hardware, m any 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 personn el only.

2. Alter ati ons of t h e d esign or circ uitry of th e products s h oul d n o t 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 safe ty-related characteristics. These characteristics are often not evi dent from vis ual insp ecti on nor c an the pr otecti on afforded by them necessarily be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts that have these special safety charact erist ics are identif ied in th e parts lis t of Servic e m anual.

Electric al comp on ent s hav ing su ch f eatur es ar e id ent ifi ed by shading on the sche m atic s an d by ( in Service manual.

does not have the same safety characteristics as the recommended replacement part shown in the parts list of Servi ce m a nua l ma y cause s hock, f i re, or ot her h a zards .

Use isolat i on tra nsformer wh en hot chassis.

The chass is an d any su b-chass is c ontain ed in som e prod ucts ar e con nect ed t o on e sid e of th e AC p owe r lin e. An is olat ion transf ormer of adequate cap acity should be ins erted between the produc t and the AC power supp ly point while perf ormin g any service on some products when the HOT chassis is exposed.

Don't short b etween the LIVE s ide gr ound a nd IS OLATE D (NEUTRAL) side ground or EARTH side ground when repairing.

Some model's power circuit is partly different in the GND. The differenc e of the G ND is shown by t he LI VE : (") side GND, the ISOLATED(N EUTRAL) : (#) sid e GND an d EARTH : ($) side GND. Don't short between the LIVE side GND and ISOLATED(NEUTRAL) side GND or EARTH side GND and never meas ure with a meas uring app aratus (oscill osc ope etc.) the LIVE side GND and ISOLATED(NEUTRAL) sid e 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. 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).

7. The high vol t age applied t o the pictur e tube must conf orm wit h that specif ied in Service manual. Excessi ve high voltage can cause an increase in X-Ray emission, arcing and possible component damage, therefor e operation under excessive high voltag e conditi ons sh ould b e kept to a mini mum, or shoul d be prevented. If severe arcing occurs, remove the AC power immediately and determine the cause by visual inspection (incorr ect inst allati on, crac ked or melt ed high volt age har ness, poor sold ering, etc.). T o maint ain the proper minimu m level of soft X-Ra y emiss ion, comp onents i n the high voltag e circuit ry includi ng the pic ture tu be must be the exact r eplacem ents or alternatives approved by the manufacturer of the complete product.

8. Do not check high voltage by drawing an arc. Use a high voltag e meter or a high vol t age prob e wit h a VTVM. Disc harg e the picture tube before attempting meter connection, by connect ing a c lip lead to t he gr ound fr am e and c onnect ing t h e 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 pr ecauti on shou ld be gi ven to assure c orrect l ead dr ess 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.

The use of a substitute replacement which

) on th e parts li st

!!!!

10.

Isolation Check

(Saf ety for Electri cal Shock Hazard )

After r e- assembling t he product, always perf orm 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 b e sure th e produc t is saf e to oper ate with out danger of electric al sh oc k.

(1)

Dielectric Streng th T est

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 t o 120V, an d 3000 V AC (r. m.s.) to an ap pli anc e rat ed 200V or mor e, f or a peri od of on e s ec on d.) This method of test requires test equipment not generally found in the service trade.

(2)

Leak age Current Check

Plug th e AC lin e c ord dir ec tly into th e AC outl et ( do not us e a line is olati on transf ormer during this ch ec k .) . Us ing a "L eakage 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 gr ound ( water pi pe, etc.) . An y l eakage c urrent mus t n ot 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 th e AC lin e c ord dir ec tly into th e AC outl et ( do not us e 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 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 voltm eter . Mo ve the resis t or c on n ection to eac h e xp os ed metal part, particularly any expo se d metal part having a return path to the chass is, and m easure the AC voltag e across the r esistor. Now, reverse the plug in the AC outlet and repeat each measur ement. A ny volt age m easur ed mus t not exc eed 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

GOOD EARTH GROUND

11.

High voltage hol d do wn circuit chec k.

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

circuit

This mark shows a fast operating fuse, the letters indicat e d be lo w show the rating.

0.15μF AC-TYPE

1500

10W

How to check the high voltage hold down

OR MORE SENSITIVITY)

PLACE THIS PROBE ON EACH EXPOSED METAL PART

POWER CORD REPLACEMENT WARNING.

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

/V,

A V

No. 51914

V-48WP30

FEATURES

New chassis d esi gn enable use of an in t er ac ti ve on sc r een control.

2-3PULL DOWN : You can enjoy DVD movies at the highest picture quality.

MOTION COMPENSATION : With this function, the seamless reproduction of dynamic motion on the screen has been realized.

Bullet-in DSD (Digital Supper Detail) circuit and 3 dimension Y/C separate circuit.

Receive DTV broadcast (1080i / 720p / 480p / 480i)

Built-in HDCP / Component (Y / P

Built-in Hyper Sound, BBE circuit.

/ PR)

FUNCTIONS

■■■■

FRONT CONTROL KEY & T ERMINAL

■

REAR TERMINAL

MENU Button ( OPERATE

4 3

Channel -/+ Button ( OPERATE / )

VOLUME -/+ Button

MAIN POWER SW Button

POWER LAMP (BLUE)

INPUT4

( AUDIO / VIDEO / S-VIDEO )

)

▼

DIGITAL IN

4 3 2

No. 51914

( DVI-D Signal Link 19pin )

INPUT 1

( AUDIO / VIDEO / S- VIDEO ) INPUT 2

( AUDIO / VIDEO ) INPUT 3

( AUDIO / VIDEO / S- VIDEO ) INPUT 2

( COMPONENT VIDEO ) INPUT 3

( COMPONENT VIDEO ) SPEAKER INPUT

AUDIO OUT

AV COMPULINK

AUDIO INPUT(For DIGITAL IN)

Ⅲ

■■■■

REMOTE CONTROL UNIT [ RM-C322G ]

3 2

POWER Key

ASPECT Key

V-48WP30

5 6

VCR / DVD Key

TV / CATV Key

NATURAL CINEMA Key

INPUT Key

DISPLAY Key

SLEEP TIMER Key

BBE Key

V.STATUS Key

10 12

11 20

HYPER SURROUND Key

MUTING Key ( memory Key )

FUNCTION Key ( ▲ / ▼ /

MENU Key

MULTI SCREEN Key

NUMBERS Key

100+ Key

/ )

RETURN+ Key

LIGHT Key

V-CHIP Key

EXIT Key

VCR / DVD Key

No. 51914

V-48WP30

■■■■

DIGITAL-IN TERMINAL FUNCTIONS

PIN No.

1 RX2- 13 RX3+ 2RX2+14 5V

3 GND2/ 4 15 GND

5 RX4+ 17 RX0-

6 SCL 18 RX0+

7 SDA 19 GND0/5

8NC20RX5-

9 RX1- 21 RX5+

10 RX1+ 22 GNDC

11 GND1/3 23 TXC+

12 RX3- 24 TXC-

PIN NAME

RX4-

PIN No.

16 HTPLG

PIN NAME

PIN AS SIG NMENT

17 18 19 20 21 22 23 24

1 2

5 6

7 8

No. 51914

INSTALLATION

1. INSTALLATION SITE

1. The rear of this s et is provi ded with ventilati on openings . Inst all the set more than 5 c m from a wall and in a loc at i on w ith good ven t i l ation.

2. Avoid the following types of locations. (1) U ns table locat i ons (l oc ati on mus t b e abl e to wi ths tand heav y wei ght). (2) Locatio ns subjected to direct sunlight. (3) Near sto ves or other heating devic es. (4) Locations subjected to humidity or oily smoke. (5) Dusty locations. (6) Locati ons wi th strong vibration.

2. INSTA LLATION ADJUSTMENT

When installing, moving or changing the orientation of the set, perform static convergence adjustment according to the following procedure.

V-48WP30

(m ore than 5cm)

Wall

VENTILATION OPENING

1. Press the MENU key of the remote control unit.

2. Select the "CONVERGENCE" in the INITIAL SETUP menu with Function key.

▲/▼

3. Press the Function / key, the convergence adjustment screen appears

with crosses ( +) displayed in 9 locations.

Locati ons where the cross es appear in 3 colours

Convergence adjustment is required. Perform steps 4 to 5.

Locations where the crosses are white:

The convergence is adjusted correctly.

lf all the crosses are white, no convergence adjustment is needed.

4. The locations of the crosses correspond to the positions of the number keys on

the remote control. A box appears around the selected cross.

5. Press the S ELECT but ton to chan ge the col or of th e box to the c olor of the

cross you want to adjust (r ed or blue).

You cannot adjust the green cross.

6. Use the / and / buttons to adjust the position of the cross.

To cancel the ad jus tments before complet i ng the pr oc edu re, press t he EXIT

button.

7. Press the ENTER button to end the convergence adjustment procedure.

lf you do not us e the TV c ontrols f or roughl y one minut e, the con vergence

adjust m ent sc reen autom atically dis app e ar s .

Fig.1

Fig.2

No. 51914

V-48WP30

TECHNICAL INFORMATION

■

MAIN MICRO COMPUTER (CPU) FUNCTION

(MIN102H57K)

№№№№

PIN NAME

1 CONV. SW 2 /VSYNC 3 LB PRO 4 NC 5 /RST 6 CONV. BUSY 7 /TEST 8 YS 9 NC 10 NC 11 A_MUTE 12 /HSYNC 13 M_MUTE 14 OSDXI 15 OSDXO 16 SDA2 17 AC_IN 18 SCL2 19 TU_POW 20 VCOI 21 PDO 22 /IP_RESET 23 YM 24 B 25 LED_POWER 26 G 27 R 28 VREF 29 IP_ERR 30 IREF 31 COMP 32 AVDD 33 CLL 34 VREFLS 35 SUB_CCD 36 NC 37 VSS 38 MAIN_CCD 39 VREFHS 40 CLH 41 VDD 42 LED_DATA

I/O

I/OI/O

CONVERGENCE SW

OOOO

V.SYNC IN for OSD

IIII

LOW B Protection

IIII

－

Micon Reset input

IIII

CONV.

OOOO

+3.3V

IIII

OSD YS OUT

OOOO

Micon test pin

OOOO

TV Sound Muting

OOOO

H.sync input for OSD

IIII

Monitor Out Muting

OOOO

－

I2C BUS (SDA) for MTS

OOOO

AC 50/60Hz in

IIII

I2C BUS (SCL) for MTS

OOOO

Tuner Power Control

OOOO

LPF input

IIII

LPF output

OOOO

OSD YM out

OOOO

OSD Blue out

OOOO

LED for Power

OOOO

OSD Green Out

OOOO

OSD Red Out

OOOO

IIII

AMDP program load det.

IIII

+3.3V

IIII

For Sub CCD

IIII

STD VOL in for Sub CCD

IIII

For Sub CCD

IIII

－

GND

IIII

For main CCD

IIII

STD VOL in for CCD

IIII

For main CCD

IIII

+3.3V

OOOO

Front control Data

OOOO

FUNCTION

№№№№

PIN NAME

43 LED_CLOCK 44 LED_ON_TIMER 45 SBO0 46 SBD0 47 AP DATA 48 INC 49 ECO RST 50 ROT COIL L 51 ROT COIL R 52 H BLK 53 SN COIL_R 54 SN COIL_L 55 BS POW 56 I2C STOP 57 NC 58 /LOB_POW 59 COMPULINK 60 /POWERGOOD 61 /MECA_ON 62 /MAIN_POW 63 NC 64 /B1 POW 65 C / N 66 X-RAY 67 EE CDS 68 KEY2 69 KEY1 70 SCL1 71 SDA1 72 REMO 73 AP REQ 74 VSS 75 OSC2 76 OSC1 77 VDD 78 SCL0 79 AP CLK 80 SDA0 81 NC 82 NC 83 NC 84 P MUTE

I/O

I/OI/O

OOOO

－

OOOO

Ter restr ial Mag net i sm Sensor

OOOO ↑

OOOO

－

OOOO

IIII

OOOO

－

OOOO

－

IIII

－

IIII

OOOO

I/O

I/OI/O

IIII

－

IIII

OOOO

IIII

OOOO

－

I/O

I/OI/O

－

OOOO

FUNCTION

F. LED CLK LED on tim er

Eco Reset Picture rotation Picture rotation H.BLK

BS pow er control I2C BUS STOP

LOB power control AV CompulinkⅢInput Power Condition Check Machine SW Interrupt MAIN POWER CONTROL NC B1 POWER CONTROL

X-ray detection

Front Key i nput 2 Front Key i nput 1 I2C BUS (CLK) for E2PROM I2C BUS (SDA) for E2PROM Remocon IN

GND 4MHz OSC 4MHz OSC +3.3V I2C BUS (CLK) for General

I2C BUS (SDA) for General

NC Pictur e mu ting

No. 51914

MAIN PARTS LOCATION

■

PWB ASS’Y ARRANGEMENT

The PWB ASS’Y is indicated below.

V-48WP30

MAIN PWB ASS’Y (SSB-1051A-M2)

POWER & DEF PWB ASS’Y (SSB-2051A-M2)

R CRT SOCKET PWB ASS’Y (SSB-3151A-M2)

G CRT SOCKET PWB ASS’Y (SSB-3251A-M2)

B CRT SOCKET PWB ASS’Y (SSB-3351A-M2)

R VM PWB ASS’Y (SSB-7151A-M2)

G VM PWB ASS’Y (SSB-7251A-M2)

B VM PWB ASS’Y (SSB-7351A-M2)

FRONT CONTROL PWB ASS’Y (SSB0L051A-M2)

REMOCON SENSOR PWB ASS’Y (SSB-8051A-M2)

FRONT CONTROL ASS’Y

CONVERGENCE PWB ASS’Y (SSB-5051A-M2)

CONVERGENCE OSD PWB ASS’Y (SSB0T051A-M2)

CENTER SPEAKER PWB ASS’Y (SSB0A051A-M2)

DIGITAL CONVERGENCE MODULE PWB ASS’Y

LINE FILTER PWB ASS’Y (SSB-9051A-M2)

DEF OSC PWB ASS’Y (SSB0H051A-M2)

I-P CONVERT MODULE PWB ASS’Y (SSB0D051A-M2)

FRONT I/F PWB ASS’Y (SSB0L251A-M2)

AV JACK PWB ASS’Y (SSB0J051A-M2)

RECEIVER PWB ASS’Y (SSB0R251A-M2)

DIGITAL INPUT MODULE PWB ASS’Y (SSB-7851A-M2)

REMOCON SENSOR PWB

(Included in CONVERGENCE PWB)

PROJECTION UNIT

FRONT CONTROL PWB

DIGITAL CONVERGENCE MOULE PWB

CONVERGENCE OSD PWB

CONVERGENCE PWB

FRONT I/F PWB

I-P COVERT MODULE PWB

LINE FILTER PWB

AV JACK PWB

RECEIVER PWB

POWER & DEF PWB

MAIN PWB

CRT SOCKET PWB (R/G/B)

CENTER SPEAKER PWB

DEF OSC PWB

AV TERMANEL BOARD

(This figure is only MAIN UNIT)

VM PWB (R/G/B)

DIGITAL INPUT MODULE PWB

No. 51914

V-48WP30

SPECIFIC SERVICE INSTRUCTIONS

SCREEN HANDLING CAUTIONS

■■■■

SCREEN STORAGE

Store the SCREEN ASS’Y in a standing position in order to avoid deformation. If the screen is stored horizontally, there is risk of def orming the screen face. When necessary to place the SCREEN ASS’Y horizontally, position the screen side upwards and sure to place spacers between the screen and resting site (floor or stand etc.) to prevent the screen from sagging.

■

SCREEN SURFACE

Since the screen surface is easily scratched or soiled, use ample care when handling.

DISASSEMBLY PROCE D URE

If the screen or screen panel need to be replaced, remove the A screws

FRONT CABINET

SCREEN BRACKET (TOP)

(X3)

Leave the screen with flesnel lens and double lenticular lens attached. If cannot be disassembled further.

SCREEN

SCREEN BRACKET (LEFT)

(X4)

SCREEN BRACKET (BOTTOM)

(X3)

SCREEN BRACKET (RIGHT)

(X4)

PROJECTION UNIT REPLACEMENT

■

ADJUSTMENT DURING REPLACEMENT

When replcing the three R, G and B projection units, first replace the R and B units and perform focus / screen / raster centerin g adjustments with ref er ence to the G unit. T hen replac e the G unit and perform G foc us / screen / converg ence adjustm ent. Finall y perform R & B . Convergence adjustments.

■

DISASSEMBLY CAUTION

The projection units include locations that are not to be disassembled during service. When replacing projection unit parts, disassemble to the state indicated in the figure below. The figure indicates screws and wires that are not to be removed. Use care not to remove these.

Deflection yoke wires : to connector on POWER & DEF. PWB ASS’Y.

[R=”RHV”, G=”GHV”, B=”BHV”]

Convergence yoke wires : to connector on CONVERGENCE PWB ASS’Y

[R=”R”, G=”G”, B=”B”]

Use care to simultaneously removes all three-projection units.

R CRT SOCKET PWB ASS’Y G CRT SOCKET PWB ASS’Y B CRT SOCKET PWB ASS’Y

PC MAGNET

Check tha t tape is applied to the CRT neck. If absent, the deflection yoke can dislodge.

Do not remove screws

LENS ASS’Y

LENS ASS’Y SCREW (X 4)

No. 51914

PC MAGNET TAPE

DEF / CONVER. YOKE

CRT ASS’Y(COUPLER ASS’Y)

Do not disassembly

VM PWB PWB (R/G/B)

ANODE wires : to DIVIDER

●

DISASSEMBLY PROCEDURE

V-48WP30

SPEAKER GRILLE

1. Remove 4 screws A from rear side.

2. Remove the SPEAKER GRILLE.

SPEAKER (WOOFER)

Remove the SPEAKER GRILLE

1. Remove 4 screws B.

2. Take out the WOOFER.

3. Disconnect the speaker wire from speaker terminal.

SPEAKER (TWEETER)

Remove the SPEAKER GRILLE

1. Remove 2 screws C.

2. Take out the TWEETER.

3. Disconnect the speaker wire from speaker terminal.

FRONT BOARD

Remove the SPEAKER GRILLE.

1. Remove 4 screws D.

2. Remove the FRONT BOARD.

FRONT CONTROL BOX

Remove the SPEAKER GRILLE.

1. Remove 4 screws E attaching the F RONT CONTROL BOX.

2. Disc onnect the c on nector

CONTROL PWB.

3. Remove the FRONT CONTROL BOX.

, X ,

on the FRONT

SPEAKER WIRE

SPEAKER

(WOOFER)

SPEAKER

(TWEETER)

FRONT CONTROL BOX

FRONT BOARD

SPEAKER GRILL

FRONT CONTROL PWB

Remove the SPEAKER GRILLE.

Remove the FRONT CONTROL BOX.

1. Remove 3 screws F from rear side of FRONT CONTROL BOX.

2. Remove the FRONT CONTROL PWB.

CAUTION AT DISASSEMBLY

48WP30CP-S : DIGITAL INPUT MODULE

POWER CORD

AV JACK BOARD

connector

FRONT CONTROL BOX

REAR SIDE

FRONT CONTROL PWB

Prior to disassembly, unplug the power code from the AC outlet

without fail. (Turn the power “off”.)

Short the SB connector (1) pin and (2) pin of the DIGITAL

INPUT MODULE. (At the time of assembling)

Bef ore the rear panel is i nserted int o the cabi net, releas e the

short-cir cuit betw een the SB conn ec tor (1) pin an d (2) pin of the DIGITAL INPUT MODULE.

After rel easing th e shor t-circ uit bet ween the SB conn ectors, do

not turn the power on until the rear p anel is inserted into th e cabinet.

Negligence in carrying out the above steps may cause the

inactivation of the TV.

No. 51914

V-48WP30

SCREEN ASS’Y

Remove the SPEAKER GRILLE.

Remove the FRONT CONTROL BOX.

1. Remove 4 screws G under the SCREEN ASS’Y from fron t side.

2. Remove 10 screws H from rear side.

3. Remove the SCREEN ASS’Y. :

NOTE

Place the screen with face upwards on a flat stand.

Because of the large size, at least two parsons are

recomm en ded for rem ov al an d reas sembl e.

Use core not to scratch the screen during work.

Duri ng assembl y, be sur e to eng age the l eft and ri ght tabs

with the cabinet mounting positions.

When than s port ing the SC REEN ASS’ Y, avoid gr aspi ng th e

top of the screen panel, instead grasp the left and right areas.

MIRROR

Remove the SPEAKER GRILLE.

Remove the FRONT CONTROL BOX.

Remove the SCREEN ASS’Y.

1. Remove 2 screws I attaching the mirror stopper.

2. Raise slightly to disengage of the mirror from the hooks.

3. Remove the MIRROR. :

NOTE

T he M IRROR is front-coated . Do not touch t he front of the

MIRROR.

At least 2 persons are recommended for removable and

reassemble.

ＧＧＧＧ

SCREEN ASS’Y

HOOKS

MIRROR

REAR PANEL

1. Loosen 7 screws

2. Remove 4 screws K.

3. Raise slightly REAR PANEL upward.

4. Remove the REAR PANEL. :

NOTE

B efor e the rear p anel is ins ert ed in to the c abi n et, rel eas e th e

short-cir cuit b etween the S B conn ector ( 1) pin an d (2) pin of the digital input unit

Af ter releasing t he short-circ uit bet ween the SB c onnectors,

do not turn the power on until the rear panel is ins erted into the cabinet

PA RTITION

Remove the REAR PANEL.

1. Pull out the PA R T I T IO N back war d.

REAR COVER

Remove the SPEAKER GRILLE.

Remove the FRONT CONTROL BOX.

Remove the SCREEN ASS’Y.

1. Remove 2 screws L.

2. Remove 2 screws M from front side

3. Sligh tly pull for back side to di se nga ge of the REAR C OVER from

hooks.

4. Remove the REAR COVER.

MIRROR STOPPER

PARTITION

BRACKET

REAR COVER

REAR PANEL

No. 51914

MAIN UNIT

Remove the SPEAKER GRILLE.

Remove the connector BH

FRONT CONTROL PWB.

Remove the REAR PANEL.

1. Remove 4 screws

2. Pull out th e MAIN UNIT rear side.

NOTE :

Except for confirmation of projection of images on the screen

and audio output thr ough the speakers , the removed main unit is still workable in the same state as if it is still built in the TV set. Therefore, the main unit can be removed, if necessary, for board diagnosis, electric testing, etc. apart from conf ir m ati on of screen im ag es and audio output.

When wire clamps are removed during work, use care to

restore them precisely to their original positions. Perf ormanc e can be aff ect ed if these ar e not ret urn ed to t he original positions.

Because of the large size, at least two persons are

recomm en ded for rem ov al an d reas sembl e.

W hen carr yin g th e m ain un it, us e c ar e n ot to dr op, s h ock or

shake it.

D o not stain or damag e the l ens of the projection unit.

Do not look through the projection unit.

CHECKING THE P.W. BOARD

When checkin g th e M AIN PWB, POWER & DEF PW B, etc., raise the MAIN UNIT with the DIVIDER side down for the sake of convenience. You can checking the MAIN P.W.B.

from front side.

, X , R , BG on the

EARTH WIRE

MAIN UNIT

V-48WP30

LINE FILTER BRACKET

LINE FILTER P.W. BOARD

Remove the REAR PANEL.

Remove the AV JACK BOARD.

1. Disconnect the connector BOARD.

2. Remove 3 sc rews P attach ing th e LI NE F ILTE R BR ACK ET and earth wir e.

3. Remove 2 screws Q attaching LINE FILTER P.W. BOARD.

4. Remove the LINE FILTER P.W . BOARD.

MAIN CHASSIS

Remove the REAR PANEL.

Remove the AV JACK BOARD.

R emove the LINE FILTER BR ACKET .

1. Remove 2 screws R both side of the MAIN CHASSIS.

2. Remove 1 screws

3. Pull out the MAIN CHASSIS for back sid e.

NOTE

If necessary, remove the anode wires, connectors,

respectively.

R’

B F on the LI NE FILTE R P.W .

attaching the earth wire.

LINE FILTER P.W.BOARD

LINE FILTER BRACK ET

EARTH WIRE

MAIN CHASSIS

R’

No. 51914

V-48WP30

PROJECTION UNIT

Remove the SPEAKER GRILLE

Remove the FRONT CONTROL BOX

Remove the REAR PANEL

R emo ve the MAIN UNIT .

1. Remove the CRT SOCKET PWB.

2. Remove 4 screws S attaching the PROJECTION UNIT.

3. Pull out the PRO J EC T IO N UNIT, upwar d. :

NOTE

Refer to “PROJECTION UNIT REPLACEMENT” on

page 8 when tak ing out and repl ac ing the PROJE CTION UNIT.

When wire clamps are removed during work, use care to

restore them precisely to their original positions. Perf orm ance can be affected if th es e are not r etur ned to the origin al positions .

HV DIVIDER

Remove the REAR PANEL

1. Remove 1 screws

2. Remove the HV DIVIDER.

Wires of the transformer (FBT) and CRT of each PROJECTION

UNIT can be removed by turning the connector portions.

NOTE

If nec essary, remove the anod e w ir es, an d replacing the

HV DIVIDER, take care to correctly engage the

connector.

!!!!

AV JACK BOARD

Remove the REAR PANEL

1. Remove 7 screws V.

2. Pull out the POWER CORD C LAMP f r om AV J ACK BOARD l eft

side.

3. Remove nut

4. Remove the AV JACK BOARD.

attaching the DIVIDER.

!!!!

attaching the antenna terminal.

!!!!

PRO J E CTION UN I T

HV DIV IDER

TurnPull

DIGITAL INPUT

MODULE

ANTENNA TERMINAL

AV JACK BOARD

DIGITAL INPUT MODULE

Remove the REAR PANEL

1. Remove 2 screws X from rear side of the AV JACK BOARD.

2. Remove the DIGITAL INPUT MODULE.

POWER CORD CLAMP

No. 51914

REPLACEMENT OF CHIP COMPONENT

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 aft er rem oving it.

SOLDERING IRON

1. Use a high ins ul ation sold erin g iron with a thin p oint ed end of it.

2. A 30w soldering iron is recommended for easily removing parts.

REPLACEMEN T STEPS

How to remove Chip parts

1. Resistors, capacitors, etc

####

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

alternately melt th e s older at each end.

(2) Shif t wi th tweezers an d r em o ve the chip part.

Transistors, diodes, variable resistors, etc

####

(1) Apply extra solder to each lead.

V-48WP30

2. How to i n stal l Ch ip p arts

Resistors, capacitors, etc

####

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

(2) Grasp th e chip part wit h twe ezers and plac e it on t he s older.

Then heat an d m elt t h e s old er at b oth en ds of th e 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

as indicated in the figure.

SOLDER

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

alternat el y melt t he s old er at each lead . Shif t and r emov e th e chip part.

Note : After removing the part, remove remaining solder from the

pattern.

SOLDER

No. 51914

(4) Then solder leads

C and C.

V-48WP30

MEMORY IC REPLACEMENT

1. Memory IC

This model use a memory IC. This mem ory IC s tores dat a for prop er oper ation of th e vid eo and deflection circuits. When rep lacing, be sure to use an IC c ontaining this (i nitial value) data.

2. Memory IC replacemen t pro cedu re

(1) Power off

Switch off the power and disconn ect the power c ord from the wall out l et.

(2) Replac e the me mo ry I C

Initial val ue must be ent ered into the new IC .

(3) Power on

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

SERVICE MENU

1.PICTURE/SOUND 7.I2C BUS

2.YC SEP 8.PP

3.LOW LIGHT 9.IP

4.HIGH LIGHT 0.SELF-CHK

5.RF AFC

Fig.1

SERVICE MENU SELECT KEY

(4) SERVICE MENU setting

1) Press

SLEEP TIMER SLEEP TIMER 0 MIN DISPLAY

key and

key and, while the indication of

is being displayed, press

VIDE O S TAT US

key on the r emote

control unit (Fig.2) simultaneously.

2) The SERVICE MENU screen of Fig.1 is displayed.

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

4) Press the EXIT key twice to return normal screen.

(5) Rec eive channel setting

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

(6) User settings

Check th e us er s ett ing items according to after page. Where these do not agree, refer to the OPERATING INSTRUCTIONS (USER’S GUIDE) and set the items as described.

DISPLAY

SLEEP TIMER

VIDEO

STATUS

MEMORY (MUTING)

VALUE SELECT(－)

FUNCTION

POWER

NUMBER

ITEM SELECT(▲)

VALUE SELECT(＋)

EXIT

ITEM SELECT(▼)

Fig.2

No. 51914

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