Jvc AV-56WP74, AV-48WP74 User Manual

AV-48WP74 AV-56WP74

SERVICE MANUAL

REAR PROJECTION TELEVISION

5210520034

BASIC CHASSIS

AV-48WP74/HA,

SB3

AV-56WP74

/HA

TABLE OF CONTENTS

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

2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

3 ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21

4 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-64

No.52105

2003/4

AV-48WP74 AV-56WP74

SPECIFICATION

Items

Dimensions (W x H x D) 120.0cm x 124.4cm x 60.9cm

( 47 1/4" x 49" x 24" ) Mass 81kg (179 Ibs) 95kg (209 Ibs) TV RF System

Color System Sound System

TV Receiving Channels and Frequency

VL Band

VH Band

UHF Band

CATV Receiving Channels and Frequency

Low Band

High Band

Mid Band Super Band Hyper Band

Ultra Band

Sub Mid Band TV/CATV Total Channel 180 Channels Antenna Terminal (VHF/UHF) 75ohm unbalanced F-type connector Intermediate Frequency

Video IF Carrier

Sound IF Carrier Color Sub Carrier 3.58MHz Power Input

Power Consumption Screen Transparent screen (unitized fresnel lens/double lenticular lens) Screen Size 48" (122cm) Measured diagonally, 16:9 ratio

Projection Tube High Voltage

Speaker Audio Power Output

External Input

Video Input Audio Input

S-Video

Component Input

Digital Input

Audio Input 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)

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)

Design & specifications are subject to change without notice.

CCIR (M) NTSC BTSC System (Multi Channel Sound)

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

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)

45.75MHz

41.25MHz (4.5MHz)

120V AC, 60Hz 248W (Max)

(W:106.3 cm x H:59.8 cm) 17cm (6.7") tube x 3 ( R/G/B )

31kV±1.0kV (at zero beam current) 16cm round x 2 (Woofer), 5.5cm round x 2 (Tweeter)

10W+10W

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

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)

FIX : 500mV(rms) (-4dBs), low impedance (1kHz when modulated 100%) (RCA pin jack x 2)

AV-48WP74 AV-56WP74

Contents

136.8cm x 138.6cm x 66.7cm ( 53 7/8" x 54 5/8" x 26 3/8" )

56" (142cm) Measured diagonally, 16:9 ratio (W:124 cm x H:69.8 cm)

1-2 (No.52105)

SECTION 1

PRECAUTIONS

AV-48WP74 AV-56WP74

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 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, 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.).

AC VOLTMETER (HAVING 1000 /V, OR MORE SENSITIVITY)

0.15 F AC-TYPE

PLACE THIS PROBE

GOOD EARTH GROUND

1500 10W

ON EACH EXPOSED ME TAL PART

(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".

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.52105)1-3

AV-48WP74 AV-56WP74

1.2 INSTALLATION

1.2.1 INSTALLATION SITE

(1) The rear of this set is provided with ventilation openings.

Install the set more than 5 cm from a wall and in a location with good ventilation.

(2) Avoid the following types of locations.

a) Unstable locations (location must be able to

withstand heavy weight). b) Locations subjected to direct sunlight. c) Near stoves or other heating devices. d) Locations subjected to humidity or oily smoke. e) Dusty locations.

f) Locations with strong vibration.

1.2.2 INSTALLATION ADJUSTMENT

When installing, moving or changing the orientation of the set, perform static convergence adjustment according to the following procedure. Adjusting CRT color convergence have two method, AUTO, MANUAL and RESET. It adjust on the MENU screen.

NOTE :

Please have you TV on for at least 20 minutes before sing this feature. This adjustment will be needed only when the colors of the characters/lines are separated and lack in distinction. If not, please don

AUTO

(1) Press the [MENU] key, and select the

(2) Press the [function left/right] key, then CONVERGENCE

(3) Press the [function up/down] key, and select the

(4) Press the [function left/right] key. (5) he convergence adjustment will start. It will take about 50

MANUAL

(1) Press the [MENU] key, and select the

(2) Press the [function left/right] key, the CONVERGENCE

(3) Press the [function up/down] key, and select the

(4) Press the [function left/right] key, then CONVERGENCE

(5) Select the location you want to adjust by using the

(6) Press the [SELECT] key to change the color of the box

(7) Use the [function up/down] key and the [function left/

(8) Adjust the three colors crosses until they overlap and

(9) Press the [OK] key.

't perform the adjustment.

"CONVERGENCE" in the INITIAL SETUP menu with the [function up/down] key.

menu appear.

"AUTO".

seconds.

"CONVERGENCE" in the INITIAL SETUP menu with [function up/down] key.

menu appears.

"MANUAL".

adjustment screen appear. [Fig.1]

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

[number (2/4/5/6/8)] keys on the remote control unit. [Fig.2]

to the color of the cross you want to adjust (red or blue).

• You cannot adjust the green cross.

right] keys to adjust the position of the cross.

appear as a single white cross.

(more than 5cm)

Wall

VENTILATION OPENING

NOTE :

• When you adjust the convergence, make sure you start with the center position (position 5), and work your way around radial for best results

• When you make the adjustment in the center (positions 5), you are making the adjustment for the whale screen. In other positions, you are making the adjustment only in that area.

• You can reset the adjustment if you do not like the results, See below.

• If you perform AUTO CONVERGENCE after performing MANUAL CONVERGENCE, your manual convergence you performed will be cancelled.

(10) Press the [MENU] key to end the convergence

adjustment procedure.

RESET

RESET in the CONVERGENCE menu resets all convergence adjustments to the factory default setting.

Fig.1

Fig.2

1-4 (No.52105)

AV-48WP74

S-VIDEO

VIDEO

OPERATE

/ MONO

SUPER FOCUS

AV-56WP74

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

2.1 FEATURES

• New chassis design enable use of an interactive on screen control.

• 2-3 PULL 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 / Pb / Pr) input.

• Built-in Hyper Sound, BBE circuit.

2.2 FUNCTIONS

FRONT CONTROL KEY & TERMINAL

MENU Button ( OPERATE )

SUPER

FOCUS

OPERATE

CHANNERL -/+ Button ( OPERATE / )

VOLUME -/+ Button

MAIN POWER Button

POWER LED (Blue)

INPUT4 ( AUDIO / VIDEO / S-VIDEO )

REAR TERMINAL

SPEAKER INPUT 16 45W MAX

OUT

S-VIDEO

AUDIO OUTSUBWOOFER

INPUT-3

INPUT-2

INPUT-1

AV COMPULINK

AUDIO

VIDEO

VIDEO S-VIDEO

OVER

INPUT4

L / MONO

COMPONENT VIDEO

INPUT-2

INPUT-1

DIGITAL IN

DIGITAL IN ( DVI-D Signal Link 19pin )

INPUT 1 ( AUDIO / VIDEO / S-VIDEO )

INPUT 2 ( AUDIO / VIDEO / S-VIDEO )

INPUT 3 ( AUDIO / VIDEO )

COMPONENT VIDEO INPUT 1 ( Y / Pb / Pr )

COMPONENT VIDEO INPUT 2 ( Y / Pb / Pr )

SPEAKER INPUT

SUBWOOFER / AUDIO OUT

AV COMPULINK

AUDIO INPUT (For DIGITAL IN)

AUDIO

(No.52105)1-5

AV-48WP74 AV-56WP74

REMOTE CONTROL UNIT [RM-C1200G]

VCR

CATV

SPLIT

FREEZE

DVD

ASPECT

MULTI SCREEN

POP

INDEX

SWAP

SELECT

POWER Key

ASPECT Key

POWER

EZ SURF

VCR / DVD Switch

TV / CATV Switch

Input select Keys

INPUT1

INPUT2

INPUT3

INPUT4

DIGITAL-IN

SLEEP TIMER

100+

THEATER

PRO

DISPLAY

NATURAL

CINEMA

SOUND

MUTING

VOL

VCR CHANNEL

PREV NEXT

PLAY FFREW

VCR/DVD

POWER

VOL

RETURN+ /TV

VIDEO

STATUS

LIGHT

C.C.

BACK

TV/VCR

STOP

PAUSE

STILL/PAUSE

REC

OPEN/CLOSE

THEATER PRO Key

SLEEP TIMER Key

DISPLAY Key

MUTING Key (memory Key)

Function up / down / right / left Keys (CH + / CH - / VOL + / VOL - Keys)

MENU Key

MULTI SCREEN operation Keys

Number (1~0)Keys

100+ Key

RETURN+ / TV Key

VIDEO STATUS Key

NATURAL CINEMA Key

LIGHT Key

SOUND Key

C.C.(Closed Caption) Key

1-6 (No.52105)

RM-C1200G

OK Key

BACK Key

VCR / DVD operation Keys

DIGITAL-IN TERMINAL FUNCTIONS

AV-48WP74 AV-56WP74

Pin name

No.

1 RX2-

2 RX2+

3 GND2/ 4

4 RX4-

5 RX4+

6 SCL

7 SDA

8NC

9 RX1-

10 RX1+

11 GND1/3

12 RX3-

Pin name

No.

13 RX3+

14 5V

15 GND

16 HTPLG

17 RX0-

18 RX0+

19 GND0/5

20 RX5-

21 RX5+

22 GNDC

23 TXC+

24 TXC-

PIN ASSIGNMENT

(No.52105)1-7

AV-48WP74 AV-56WP74

2.3 TECHNICAL INFORMATION

2.3.1 MAIN MICRO COMPUTER (CPU) FUNCTION (MN102H75K)

Pin No. Pin name I/O Function

1 NC - --------

2 /MICON_V I V.sync for OSD

3 LB_PRO I Low B protection detection

4 NC - --------

5 /RST I Main cpu reset input

6 NC - --------

7 /TEST I +3.3V

8 OSD_YS O OSD Ys output

9 NC - --------

10 NC - --------

11 A_MU O Audio muting

12 /MICON_H I H sync input

13 M_MU O Monitor sound out muting

14 P46,OSDXI - Keep for OSD

15 P45,OSDXO - Keep for OSD

16 SDA2 I/O I

C bus (CLK) for MTS

17 AC_IN I AC (60Hz) input

18 SCL2 O I

C bus (DATA) for MTS

19 TU_POW O Tuner power control

20 VCOI I LPF input

21 PDO O LPF output

22 /IP_RESET O Reset

23 OSD_YM O OSD YM output

24 OSD_B O OSD blue output

25 POWER_LED O Lighting for POWER LED

26 OSD_G O OSD green output

27 OSD_R O OSD red output

28 VREF I --------

29 IP_ERR I AMDP program load detect.

30 IREF I --------

31 COMP I --------

32 AVDD I +3.3V

33 CLL I For sub CCD

34 VREFLS I STD VOL for sub CCD

35 SUB_CCD I For sub CCD

36 NC - --------

37 VSS I GND

38 MAIN_CCD I For main CCD

39 VREFHS I STD VOL for main CCD

40 CLH I For main CCD

41 VDD/VPP O +3.3V

42 CLK SW1 O IP clock switch

Pin No. Pin name I/O Function

43 CLK SW2 O IP clock switch

44 ON_TIM O Lighting for ON TIMER

45 CONVER_RXD O Convergence control

46 CONVER TXD I Convergence control

47 SBT1 I --------

48 NC - --------

49 NC - --------

50 NC - --------

51 NC - --------

52 EE_ABL O ACL control

53 CHROMA O Chroma / gamma control

54 DC_COTL O DC, control

55 NC - --------

56 NC - --------

57 TU2_AID I Main AFC input

58 /LOB_POW O Low B power control

59 COMPULINK I AV COMPULINK lll input

60 /POWERGOOD I Power condition check

61 MECA_ON I Machine SW interrupt

62 /MAIN_POW O Main power control

63 NC - --------

64 /B1 POW O B1 power control

65 C/N I AFC voltage input

66 X_RAY I X-ray protection detection

67 NC - --------

68 KEY2 I Front key input 2

69 KEY1 I Front key input 1

70 SCL1 O I

71 SDA1 I/O I

C bus (CLK) for EEP-ROM

C bus (SDA) for EEP-ROM

72 REMO I Remote control input

73 NC - --------

74 VSS I GND

75 OSC2 O 4MHz clock oscillation

76 OSC1 I 4MHz clock oscillation

77 VDD I +3.3V

78 SCL0 O I

C bus (CLK) for general

79 AP_CLK - --------

80 SDA0 I/O I

C bus (SDA) for general

81 NC - --------

82 NC - --------

83 NC - --------

84 P_MU O Picture muting

1-8 (No.52105)

2.4 MAIN PARTS LOCATION

2.4.1 PWB ASS'Y ARRANGEMENT

The PWB ASS'Y is indicated below.

PWB ASS’Y NAME AV-48WP74 AV-56WP74

MAIN PWB ASS'Y SSB-1070A-M2 SSB-1069A-M2

RECEIVER PWB ASS'Y SSB0R368A-M2 SSB0R368A-M2

MI-COM & DIST MODULE PWB ASS'Y SSB0D070A-M2 SSB0D069A-M2

POWER & DEF PWB ASS'Y SSB-2070A-M2 SSB-2069A-M2

DEF OSC PWB ASS'Y SSB0H068A-M2 SSB0H068A-M2

LINE FILTER PWB ASS'Y SSB-9068A-M2 SSB-9068A-M2

FRONT RELAY PWB ASS'Y SSB0L268A-M2 SSB0L268A-M2

CONVERGENCE OUT PWB ASS'Y SSB-5068A-M2 SSB-5068A-M2

DIGITAL CONVERGENCE MODULE PWB ASS'Y SSB0K070A-M2 SSB0K069A-M2

DIGITAL INPUT MODULE PWB ASS'Y -------- --------

REMOCON SENSOR PWB ASS'Y SSB-8068A-M2 SSB-8068A-M2

R CRT SOCKET PWB ASS'Y SSB-3168A-M2 SSB-3168A-M2

G CRT SOCKET PWB ASS'Y SSB-3268A-M2 SSB-3268A-M2

B CRT SOCKET PWB ASS'Y SSB-3368A-M2 SSB-3368A-M2

G VM PWB ASS'Y SSB-7268A-M2 SSB-7268A-M2

FRONT CONTROL PWB ASS'Y SSB0L068A-M2 SSB0L068A-M2

AV-48WP74 AV-56WP74

FRONT CONTROL ASS'Y PROJECTION UNIT

FRONT CONTROL PWB

DIGITAL CONVERGENCE MODULE PWB

CRT SOCKET PWB (R/G/B)VMPWB (G only)

REMOCON SENSOR PWB

DEF OSC PWB

DIGITAL INPUT MODULE PWB

CONVERGENCE OUT PWB

FRONT RELAY PWB

MI-COM & DIST MODULE PWB

LINE FILTER PWB

MAIN PWB

RECEIVER PWB

POWER & DEF PWB

AV TERMANEL BOARD

(This figure is only MAIN UNIT)

(No.52105)1-9

AV-48WP74 AV-56WP74

2.5 SCREEN HANDLING CAUTIONS

2.5.1 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

deforming 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.

2.5.2 SCREEN SURFACE

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

DISASSEMBLY PROCEDURE

If the screen or screen panel need to

FRONT CABINET

be replaced, remove the 24 screws A.

SCREEN BRACKET

(TOP)

SCREEN BRACKET

(RIGHT)

SENSOR

A( x 7)

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

SCREEN

SENSOR

SCREEN BRACKET

(LEFT)

A( x 5)

A( x 7)

A( x 5)

SENSOR

SCREEN BRACKET

(BOTTOM)

2.6 PROJECTION UNIT REPLACEMENT

2.6.1 ADJUSTMENT DURING REPLACEMENT

When replacing the three R, G and B projection units, first replace the R and B units and perform focus / screen / raster centering adjustments with reference to the G unit. Then replace the G unit and perform G focus / screen / convergence adjustment. Finally perform R & B convergence adjustments. Use care to simultaneously removes all three-projection units.

2.6.2 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"]

LENS ASS'Y SCREW ( x 4)

1-10 (No.52105)

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

Do not remove screws

LENS ASS'Y

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

PC MAGNET

PC MAGNET TAPE

VM PWB (G only)

ANODE wires : to DIVIDER

DEF. / CONVER. YOKE

CRT ASS'Y (COUPLER ASS'Y)

Do not disassembly

2.7 DISASSEMBLY PROCEDURE

• Make sure that the power cord is pulled out from the AC outlet.

2.7.1 SPEAKER GRILLE

(1) Remove 4 screws [ A ] from rear side. (2) Open the door of the FRONT CONTROL BOX and remove

2 screws [ B ] from front side.

(3) Take out the SPEAKER GRILLE.

2.7.2 SPEAKER (WOOFER)

• Take out the SPEAKER GRILLE (1) Remove 4 screws [ C ]. (2) Take out the WOOFER. (3) Disconnect the speaker wire from speaker terminal.

*Remove the both side speaker same manner.

2.7.3 SPEAKER (TWEETER)

• Take out the SPEAKER GRILLE (1) Remove 2 screws [ D ]. (2) Take out the TWEETER. (3) Disconnect the speaker wire from speaker terminal.

*Remove the both side speaker same manner.

2.7.4 FRONT BOARD

• Take out the SPEAKER GRILLE. (1) Remove 4 screws [ E ]. (2) Take out the FRONT BOARD.

2.7.5 FRONT CONTROL BOX

• Take out the SPEAKER GRILLE. (1) Remove 4 screws [ F ] attaching the FRONT CONTROL

BOX.

(2) Disconnect the connector [BH], [R], [BG] on the FRONT

CONTROL PWB.

(3) Take out the FRONT CONTROL BOX.

2.7.6 FRONT CONTROL PWB

• Take out the SPEAKER GRILLE.

• Take out the FRONT CONTROL BOX. (1) Remove 3 screws [ G ] from rear side of FRONT

CONTROL BOX.

(2) Take out the FRONT CONTROL PWB.

SPEAKER WIRE

SPEAKER

(WOOFER)

SPEAKER

(TWEETER)

BH BGR

FRONT CONTROL BOX

REAR SIDE

AV-48WP74 AV-56WP74

FRONT CONTROL

BOX

FRONT BOARD

SPEAKER GRILL

Fig.1

FRONT CONTROL PWB

Fig.2

CAUTION AT DISASSEMBLY

48WP74CP-S : DIGITAL INPUT MODULE [AV-48WP74] 56WP74CP-S : DIGITAL INPUT MODULE [AV-56WP74]

AV JACK BOARD

POWER CORD

SB connector

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)

Before the rear panel is inserted into the cabinet, release the

short-circuit between the SB connector [1] pin and [2] pin of the

DIGITAL INPUT MODULE.

After releasing the short-circuit between the SB connectors, do

not turn the power on until the rear panel is inserted into the

cabinet.

Negligence in carrying out the above steps may cause the

inactivation of the TV.

(No.52105)1-11

AV-48WP74 AV-56WP74

2.7.7 SCREEN ASS'Y

• Take out the SPEAKER GRILLE.

• Take out the FRONT CONTROL BOX. (1) Remove the 2 screws [ H ] under the SCREEN ASS'Y from

front side. (2) Remove 10 screws [ I ] from rear side. (3) Take out the connector [ CN00Z ]. (4) Take out the SCREEN ASS'Y.

NOTE :

• Please place the SCREEN ASS'Y on a flat table without fail.

• Because of the large size, at least two parsons are recommended for removal and reassemble.

• Use core not to scratch the screen during work.

• During assembly, be sure to engage the left and right tabs with the cabinet mounting positions.

• When supporting the SCREEN ASS'Y, grasp the both sides of the screen panel instead of the upper side of the screen panel.

2.7.8 MIRROR

• Take out the SPEAKER GRILLE.

• Take out the FRONT CONTROL BOX.

• Take out the SCREEN ASS'Y. (1) Remove 2 screws [ J ] attaching the mirror stopper. (2) Raise slightly to disengage of the mirror from the hooks. (3) Take out the MIRROR.

NOTE :

• The MIRROR is front-coated. Do not touch the front of the MIRROR.

• At least 2 persons are recommended for removable and reassemble.

SCREEN ASS'Y

CN00Z

Fig.3

MIRROR

MIRROR STOPPER

Fig.4

1-12 (No.52105)

2.7.9 REAR PANEL

(1) Loosen 7 screws [ K ]. (2) Remove 4 screws [ L ]. (3) Raise slightly REAR PANEL upward. (4) Take out the REAR PANEL.

NOTE :

• Before the rear panel is inserted into the cabinet, release the short-circuit between the [SB] connector (1) pin and (2) pin of the DIGITAL INPUT UNIT. (Refer to "CAUTION AT DISASSEMBLY" on Page 11).

• After releasing the short-circuit between the [SB] connectors, do not turn the power on until the rear panel is inserted into the cabinet.

Prior to starting the work, be sure to read the following written instructions on the CAUTION LABEL attached to the REAR PANEL.

UNPLUG THE POWER CORD FROM AC OUTLET BEFORE OPEN THE REAR COVER (PANEL). When the rear cover (panel) is removed, follow "CAUTION AT DISASSEMBLY" procedure in the service manual before plugging the TV's power cord into an AC outlet. Failure to follow the procedure will result in PERMANENT damage to some of the television features.

PARTITION

AV-48WP74 AV-56WP74

REAR PANEL

Fig.5

2.7.10 PARTITION

• Take out the REAR PANEL. (1) Pull out the PARTITION back ward.

2.7.11 REAR COVER

• Take out the SPEAKER GRILLE.

• Take out the FRONT CONTROL BOX.

• Take out the SCREEN ASS'Y. (1) Remove 2 screws [ M ]. (Fig.5) (2) Remove 2 screws [ N ] from front side. (3) Slightly pull for backside to disengage of the REAR

COVER from hooks.

(4) Take out the REAR COVER.

• Because of the large size, at least two persons are recommended for removal and reassemble.

REAR COVER

BRACKET

Fig.6

(No.52105)1-13

AV-48WP74 AV-56WP74

2.7.12 MAIN UNIT

• Take out the SPEAKER GRILLE.

• Take out the connector [BH], [R], [BG] on the FRONT CONTROL PWB.

• Take out the REAR PANEL. (1) Remove 4 screws [ O ] from front side. (2) Remove 1 screw [ P ] and 3 screws [ Q ] attaching the

MAIN CHASSIS and BODY.

(3) Pull out the MAIN UNIT rear side.

NOTE :

• Except for confirmation of projection of images on the screen and audio output through 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 confirmation of screen images and audio output.

• When wire clamps are removed during work, use care to restore them precisely to their original positions. Performance can be affected if these are not returned to the original positions.

• Because of the large size, at least two persons are recommended for removal and reassemble.

• When carrying the MAIN UNIT, use care not to drop, shock or shake it.

• Do not stain or damage the lens of the PROJECTION UNIT.

• Do not look through the PROJECTION UNIT.

2.7.12.1 CHECKING THE P.W. BOARD

When checking the MAIN PWB, POWER & DEF PWB, etc., raise the MAIN UNIT with the HV DIVIDER side down for the sake of convenience. You can checking the POWER & DEF PWB and CONVERGENCE OUT PWB.

REAR SIDE

MAIN UNIT

BODY

Fig.7

2.7.13 LINE FILTER PWB

• Take out the REAR PANEL.

• Take out the AV TERMINAL BOARD. (Refer to next page) (1) Disconnect the connector [B], [F] on the LINE FILTER

PWB.

(2) Remove 3 screws [ R ] attaching the LINE FILTER

BRACKET and earth wire. (3) Remove 3 screws [ S ] attaching LINE FILTER PWB. (4) Take out the LINE FILTER PWB.

LINE FILTER BRACKET

LINE FILTER PWB

LINE FILTER BRACKET

Fig.8

1-14 (No.52105)

2.7.14 AV TERMINAL BOARD

• Take out the REAR PANEL (1) Remove 9 screws [ T ]. (2) Remove 1 screws [ U ]. (3) Pull out the POWER CORD CLAMP from AV TERMINAL

BOARD left side. (4) Remove the nut [ V ] attaching the ANTENNA TERMINAL. (5) Take out the AV TERMINAL BOARD.

2.7.15 DIGITAL INPUT MODULE

• Take out the REAR PANEL (1) Remove 2 screws [ W ] from rear side of the AV TERMINAL

BOARD.

(2) Take out the DIGITAL INPUT MODULE.

NOTE :

• When removing the DIGITAL INPUT MODULE, refer to the "CAUTION AT DISASSEMBLY" section on page 11.

DIGITAL INPUT

MODULE

ANTENNA TERMINAL

POWER CORD

CLAMP

AV-48WP74 AV-56WP74

AV TERMINAL

BOARD

POWER CORD

Fig.9

2.7.16 MAIN CHASSIS

• Take out the REAR PANEL.

• Take out the AV TERMINAL BOARD.

• Take out the LINE FILTER BRACKET. (1) Remove 2 screws [ X ] both side of the MAIN CHASSIS. (2) Remove 1 screws [ Y ] attaching the earth wire. (3) Remove 1 screw [ P ] attaching the MAIN CHASSIS and

BODY.(Fig.7)

(4) Pull out the MAIN CHASSIS for back side.

NOTE :

• If necessary, remove the anode wires, connectors, respectively.

EARTH WIRE

MAIN CHASSIS

X Y

Fig.10

(No.52105)1-15

AV-48WP74 AV-56WP74

2.7.17 PROJECTION UNIT

• Take out the SPEAKER GRILLE

• Take out the FRONT CONTROL BOX

• Take out the REAR PANEL

• Take out the MAIN UNIT. (1) Take out the CRT SOCKET PWB. (2) Remove 4 screws [ Z ] attaching the PROJECTION UNIT. (3) Pull out the PROJECTION UNIT, upward.

NOTE :

• Refer to "PROJECTION UNIT REPLACEMENT" on page 10 when taking out and replacing the PROJECTION UNIT.

• When wire clamps are removed during work, use care to restore them precisely to their original positions. Performance can be affected if these are not returned to the original positions.

2.7.18 HV DIVIDER

• Take out the REAR PANEL (1) Remove 1 screws [ a ] attaching the HV DIVIDER. (2) Take out the HV DIVIDER.

Wires of the transformer (FBT) and CRT of each PROJECTION UNIT can be removed by turning the connector portions.

NOTE :

• If necessary, remove the anode wires, and replacing the HV DIVIDER, take care to correctly engage the [ b ] connector.

2.7.19 REMOCON SENSOR PWB

• Take out the REAR PANEL (1) Remove 1 screws [ c ] attaching the REMOCON SENSOR

PWB.

(2) Take out the REMOCON SENSOR PWB.

PROJECTION UNIT

REMOCON

SENSOR PWB

HV DIVIDER

Turn

Pull

Fig.11

1-16 (No.52105)

2.8 REPLACEMENT OF CHIP COMPONENT

2.8.1 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.

2.8.2 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.

2.8.3 REPLACEMENT STEPS

1. How to remove Chip parts [Resistors, capacitors, etc.]

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

alternately melt the solder at each end.

AV-48WP74 AV-56WP74

2. How to install Chip parts [Resistors, capacitors, etc.]

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

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

[Transistors, diodes, variable resistors, etc.]

(1) Apply extra solder to each lead.

SOLDER

(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.

(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.

(4) Then solder leads B and C.

Note :

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

(No.52105)1-17

AV-48WP74 AV-56WP74

2.9 MEMORY IC REPLACEMENT

2.9.1 MEMORY IC

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

2.9.2 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

Initial value must be entered into the new IC.

(3) Power on

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

(4) SERVICE MENU setting

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 of Fig.1 is displayed. c) Verify what to set in the 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 after page. Where these do not agree, refer to the OPERATING INSTRUCTIONS (USER'S GUIDE) and set the items as described.

DISPLAY

SLEEP TIMER

MEMORY (MUTING)

FUNCTION (LEFT)

SERVICE MENU

1.PICTURE/SOUND

2.YC SEP

3.WHITE BALANCE

4.MEMORY SETUP

5.RF AFC

6.CONVER A

7.CONVER BD

8.PP

9.IP

0.GCR

Fig.1

SERVICE MENU SELECT KEY

VCR

DVD

CATV

SPLIT

FREEZE

INPUT1

INPUT2

INPUT3

INPUT4

DIGITAL-IN

SLEEP TIMER

MUTING

VCR CHANNEL

PREV NEXT

REC

OPEN/CLOSE

MULTI SCREEN

POP

SWAP

100+

THEATER

PRO

DISPLAY

VOL

RM-C1200G

PLAY FFREW

STOP

ASPECT

INDEX

SELECT

NATURAL

CINEMA

SOUND

VCR/DVD

POWER

EZ SURF

RETURN+ /TV

VIDEO

STATUS

LIGHT

C.C.

VOL

BACK

TV/VCR

PAUSE

STILL/PAUSE

POWER

NUMBER

VIDEO STATUS

FUNCTION (UP)

FUNCTION (RIGHT)

BACK

FUNCTION (DOWN)

Fig.2

2.9.3 SERVICE ADJUSTMENT ITEM

Setting item Item No. Remark Setting item Item No. Remark

1.PICTURE / SOUND 7.CONVER B AUDIO A01~A27 Convergence adjustment -----VIDEO S01~S99 8.PP DEFLECTION D01~D32 Multi-picture adjustment and FACTORY setting F01~F70 PPA001~PPA008 Do not adjust

setting

ADM001~ADM034 Do not adjust

2.YC SEP PPB001~PPB036 Do not adjust YC separation setting YCM001~YCM185 Do not adjust PPC001~PPC008 Do not adjust

YCS001~YCS114 Do not adjust PPD001~PPD025 Do not adjust

3.WHITE BALANCE 9.IP LOW LIGHT / HIGH LIGHT adjustment

BR, DRV R, DRV B,

CWT R, CWT G,

DIST process setting IPA001~IPA120 Do not adjust

CWT B

4.MEMORY SETUP ------ Do not adjust IPB001~IPB079 Do not adjust

5.RF AFC IPC001~IPC044 Do not adjust Tuner AFC setting TUNER, AFC,FINE Do not adjust IPD001~IPD026 Do not adjust

6.CONER A IPE001~IPE015 Do not adjust Convergence adjustment CPA01~CPA08 0.GCR

CCA01~CCA09 Ghost reduction setting Not use CBA01~CBA80 Do not adjust

1-18 (No.52105)

AV-48WP74 AV-56WP74

2.9.4 SHIPPING FACTORY SETTING

VIDEO STATUS MEMORY (NTSC / 480p)

Setting value

Item

STANDARD 00000LOW

THEATER 0 0 0 0 0 HIGH

DYNAMIC 0 0 10 0 5 HIGH

GAME 0 0 -10 0 0 HIGH

(HD)

Item

STANDARD 00000LOW

THEATER 0 0 0 0 0 HIGH

DYNAMIC 00500LOW

GAME 0 0 -10 0 0 HIGH

CHANNEL SETTING (CHANNEL SUMMARY)

Band CH display Band CH display

VHF LOW 2 SUPER K 24

VHF HIGH 7 W 36

UHF 14 HYPER W+11 47

MID A 14

B15

C16

D17

E18

H21

TINT COLOR PICTURE BRIGHT DETAIL

Setting value

TINT COLOR PICTURE BRIGHT DETAIL

4O28

5R31

6S32

9SUBMIDA-496

11 A-3 97

13 A-2 98

36 W+12 48

63 W+17 53

69 W+23 59

COLOR

TEMPERATURE

COLOR

TEMPERATURE

(No.52105)1-19

AV-48WP74 AV-56WP74

SHIPPING FACTORY SETTING (USER SETTING)

Setting item Setting value Setting item Setting value

POWER CHANNEL VOLUME INPUT

DISPLAY NATURAL CINEMA SLEEP TIMER ASPECT VIDEO STATUS

SOUND A.H.S BBE

HYPER SURROUND OFF

SPLIT SOURCE

POP SOURCE

VERTICAL POSITION CENTER CH INPUT XDS ID CONVERGENCE POWER INDICATOR

OFF CABLE-02 10 TV

OFF AUTO 0 REGULAR DYNAMIC

OFF ON

left side : CA 02 right side : CA 04

left side : CA 02 right upper : CA 04 right center : CA 05 right bottom : CA 07

Center OFF ON Optimum condition HIGH

TINT / COLOR / PICTURE/ BRIGHT / DETAIL

COLOR TEMPERATURE DIG. NOISE CLEAR

BASS / TREBLE / BALANCE MTS

SET CLOCK ON / OFF TIMER LANGUAGE NOISE MUTING CLOSED CAPTION FRONT PANEL LOCK

AUTO SHUT OFF AUTO TUNER SET UP DIGITAL-IN ( at 480p signal input ) CHANNEL SUMMARY

V-CHIP SET LOCK CODE AUTO DEMO

Refer to setting of Video status memory at shipping factory setting

HIGH OFF

Center STEREO

Unnecessary to set NO ENG ON OFF ( CC1 / T1 ) OFF

OFF Unnecessary to set SIZE 1

Refer to Last memory (CH. summary) OFF Unnecessary to set OFF

1-20 (No.52105)

+ 46 hidden pages