JVC PD-Z42DX4, PD-Z42DX4/S Service Manual

SERVICE MANUAL

PDP COLOUR TELEVISION

YA22820052

PD-Z42DX4,

PD-Z42DX4

TABLE OF CONTENTS

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

2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

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

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-30

BASIC CHASSIS

FP2

No.YA228

2005/2

SPECIFICATION

Items Contents

Dimensions ( W × H × D ) 104.5cm × 72.9 cm × 11.5 cm

Mass 39.0kg TV RF System B, G, I, D, K, K1, M Colour System PAL / SECAM / NTSC 3.58 / NTSC 4.43 Stereo System A2 (B/G, D/K), NICAM (B/G, I, D/K) Teletext System FLOF (Fastext), TOP, WST (World Standard System) Receiving

Frequency

Intermediate Frequency VIF

Colour Sub Carrier

Power Input AC110V - AC240 V, 50 Hz / 60 Hz Power Consumption 287W (Standby: 3.0W) Plasma Display Panel (PDP) 42V-inch wide aspect (16:9)

Screen Size Diagonal : 105cm (H: 91.8cm × V: 51.8cm) Display Pixels Horizontal : 1024 dots × Vertical : 768 dots (XGA)

Audio Power Output 10W + 10W

Speaker 6.6cm, round type × 4 (Oblique corn) Aerial Terminal (VHF/UHF) 75Ω unbalanced, coaxial

Video / Audio [Input-1/2/3/4]

Digital Input Video

Video / Audio Output S-Video

PC (RGB) Input D-sub 15pin × 1

Subwoofer Output

Centre Channel Input 500mV(rms) (-4dBs), high impedance,RCA pin jack × 1 Audio Output 500mV (rms), Low impedance, RCA pin jack × 2 Headphone 3.5mm stereo mini jack × 1 Remote Control Unit RM-C1830 (AA/R6 dry cell battery × 2)

Design & specifications are subject to change without notice.

Component Video

VHF Low

VHF High

UHF

CATV

SIF

PAL

SECAM

NTSC

[Input-1/3]

1125i

625p / 525p

625i / 525i

S-Video

[Input-1/2/4]

Video Audio

Audio

Video Audio

46.25MHz - 168.25MHz

175.25MHz - 463.25MHz

471.25MHz - 863.25MHz Mid (X - Z+2, S1 - S10) / Super (S11 - S20) / Hyper (S21 - S41) bands

38.0MHz (B, G, I, D, K, L)

32.26MHz (5.74MHz: B), 32.15MHz (5.85MHz: G), 31.45MHz (6.55MHz: I)

31.75MHz (6.25MHz: D), 32.15MHz (5.85MHz: K)

4.43MHz

4.40625MHz / 4.25MHz

3.58MHz / 4.43MHz

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 : 0.7V(p-p), 75 Ω Mini-DIN 4 pin connector × 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 × 3 500mV (rms), High impedance, RCA pin jack × 6

HDMI connector × 1

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

Digital: HDMI connector × 1 Anarog: 500mV(rms) (-4dBs), high impedance, RCA pin jack × 2

Mini-DIN 4 pin connector × 1 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 × 1 500mV (rms), Low impedance, RCA pin jack × 2

R/G/B : 0.7V (p-p), 75Ω

HD / VD : 1V (p-p) to 5V (p-p), high impedance < Available signal >

VGA : 640 pixels × 480 pixels (Horizontal : 31.5kHz / Vertical : 60Hz) XGA : 1024 pixels × 768 pixels (Horizontal : 42.0kHz / Vertical : 60Hz)

More than 0 to 1000mV (rms) (+2.2dBs), low impedance (80Hz when modulated 100%), RCA pin jack × 1

1-2 (No.YA228)

SECTION 1

PRECAUTION

1.1 SAFETY PRECAUTIONS

The design of this product contains special hardware, many

(1)

circuits and components specially for safety purposes. For continued protection, no changes should be made to the original design unless authorized in writing by the manufacturer. Replacement parts must be identical to those used in the original circuits. Service should be performed by qualified personnel only.

(2) Alterations of the design or circuitry of the products should

not be made. Any design alterations or additions will void the manufacturer's warranty and will further relieve the manufacturer of responsibility for personal injury or property damage resulting therefrom.

(3) Many electrical and mechanical parts in the products have

special safety-related characteristics. These characteristics are often not evident from visual inspection nor can the protection afforded by them necessarily be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts which have these special safety characteristics are identified in the parts list of Service manual. Electrical components having such features are

identified by shading on the schematics and by ( ) on the parts list in Service manual. The use of a substitute

replacement which does not have the same safety characteristics as the recommended replacement part shown in the parts list of Service manual may cause shock, fire, or other hazards.

(4) 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 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.

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

recommended that the PDP POWER SUPPLY setting should be checked or adjusted.

(6) The high voltage applied to the PDP must conform with that

specified in Service manual. Excessive high voltage can cause an increase in 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 components in the circuitry including the PDP must be the exact replacements or alternatives approved by the manufacturer of the complete product.

(7) 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 resistor to the anode button.

Ω 2W

(8) 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.

(9) Isolation Check

(Safety for Electrical Shock Hazard)

After re-assembling the product, always perform an isolation check on the exposed metal parts of the cabinet (antenna terminals, video/audio input and output terminals, Control knobs, metal cabinet, screw heads, earphone jack, control shafts, etc.) to be sure the product is safe to operate without danger of electrical shock.

a) Dielectric Strength Test

The isolation between the AC primary circuit and all metal parts exposed to the user, particularly any exposed metal part having a return path to the chassis should withstand a voltage of 3000V 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 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 sensitivity in the following manner. Connect a 1500 resistor paralleled by a 0.15

Ω per volt or more

Ω 10W

µF AC-type capacitor

between an exposed metal part and a known good earth ground (water pipe, etc.). Measure the AC voltage across the resistor with the AC voltmeter. Move the resistor connection to each exposed metal part, particularly any exposed metal part having a return path to the chassis, and measure the AC voltage across the resistor. Now, reverse the plug in the AC outlet and repeat each measurement. Any voltage measured must not exceed

0.75V AC (r.m.s.). This corresponds to 0.5mA AC (r.m.s.). However, in tropical area, this must not exceed 0.3V AC (r.m.s.). This corresponds to 0.2mA AC (r.m.s.).

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

0.15 F AC-TYPE

PLACE THIS PROBE

1500 10W

GOOD EARTH GROUND

ON EACH EXPOSED ME TAL PAR T

(No.YA228)1-3

1.2 INSTALLATION

1.2.1 HEAT DISSIPATION

If the heat dissipation vent behind this unit is blocked, cooling efficiency may deteriorate and temperature inside the unit will rise. The temperature sensor that protects the unit will be activated when internal temperature exceeds the pre-determined level and power will be turned off automatically. Therefore, please make sure pay attention not to block the heat dissipation vent as well as the ventilation outlet behind the unit and ensure that there is room for ventilation around it.

1.2.2 INSTALLATION REQUIREMENTS

Ensure that the minimal distance is maintained, as specified below, between the unit with and the surrounding walls, as well as the floor etc. Install the unit on stable flooring or stands. Take precautionary measures to prevent the unit from tipping in order to protect against accidents and earthquakes.

SPACE REQUIRED FOR INSTALLATION

150 mm or

150 mm

200 mm or 200 mm

50 mm

50 mm or more

1.2.3 FALL TIP PREVENTION MEASURES

Take precautionary measures to prevent the unit from falling or tipping to protect against emergencies such as earthquakes as well as accidents. Fasten the supplied hook for tip fall prevention using the screws, also supplied, behind the display unit, and use them together with durable cords (to be purchased separately) to secure the unit to a robust part such as the wall surface or pillars.

150 mm or more

150 mm

200 mm 200 mm

or more

50 mm

50 mm or more

1-4 (No.YA228)

The supplied hook for tipfall prevention

1.3 PRECAUTIONS REGARDING PDP

1.3. 1 PRECAUTIONS DURING NOTES FOR TRANSPORTATION

When transporting the unit, pressure exerted on the internal PDP (Plasma Display Panel) due to improper handling (such as tossing and dropping) may cause damages even when the unit is carefully packed. To prevent accidents from occurring during transportation, pay careful attention prior to delivery such as through explaining the handling instructions to transporters. Ensure that the following requirements are met during transportation, as the PDP of this unit is made of glass and therefore fragile:

(1) Avoid vibrations and impacts

The unit may be broken if it is toppled sideways even when properly packed. Ensure that the unit is carried by at least 2 persons and pay careful attention not to exert any vibration or impact on it.

(2) Do not place equipment horizontally

Ensure that it is placed upright and not horizontally during transportation and storage as the PDP is very vulnerable to lateral impacts and may break easily under such circumstances. During transportation, ensure that the unit is loaded along the traveling direction of travel of the vehicle, and avoid stacking them on one another. For storage, ensure that they are stacked in 2 layers or less even when placed upright.

1.3.2 RESIDUAL IMAGE / BURN-IN ON SCREEN

Like CRTs, "burn-in" may occur when a same image is continuously displayed over an extended period of time. As this may also shorten the life span of the PDP. Therefore, turn off the display when not in use, scroll the screen, make use of screen-savers, or allow even distribution on the display by inverting the brightness, switching to complementary colors or inserting animated images at periodic intervals. As burn-in is more likely to occur with high brightness and contrast settings, try to use neutral gradations or medium tone colors. Burn-in does not occur in the case of animated images. When switching to another image after continuous display of the previous image, residual images may become prominent, as luminance in a part of the display is higher than the other parts. This is not a defect but is because due to the discharge surface of the lighted portion has become being relatively activated and its luminance higher than the unlighted parts.

1.3.4 OPTICAL FILTER (PANEL FILTER)

Avoid placing the unit under direct sunlight over a prolonged period of time. This may cause the optical filter to deteriorate in quality and color. Clean the filter surface by wiping it softly lightly with outing flannels a soft and lightly fuzz cloth (such as flannel). Do not use solvents such as benzine or thinner to wipe the filter surface. This may cause the filter to deteriorate in quality or the coating on the surface to come off. As the filter surface is fragile., do not scratch or hit it with hard materials.

1.3.5 NOTES PRECAUTIONS FOR PEPLACEMENT OF EXTERIOR PARTS

Take note of the following when replacing exterior parts (back REAR COVER, FRONT PANEL, optical filter)

• Do not exert pressure on the front of the PDP (glass surface).

• Pay careful attention not to scratch or stain the front of the PDP

(surface) with hands.

• When replacing exterior parts, the front of the PDP should be

placed facing downward. Place a mat, etc. underneath to avoid causing scratches to the front surface. However, never use materials that are too soft (such as blanket cloth). If replacement is made with the PDP surface facing downward and in contact with the blanket, pressure may be exerted on the PDP, thus causing damages to it.

1.3.3 INFRARED RAYS

Near Near-infrared rays (800nm to 1000nm) are emitted from the front of the panel, and this may give rise to malfunctions in infrared remote controls or communication systems placed near it. In this case, avoid direct infrared rays (and reflected rays in some cases) from the screen by either changing the direction of the unit or other infrared systems or securing a longer keeping a distance from the screen.

(No.YA228)1-5

SECTION 2

LOB OK FAN OK SYNC M:OK S:OK HD:NG TIM OK MSM OK DIGI 0000 MEM OK AVSW OK YC OK AIO OK TUN OK GCR NG 1 IP OK RGB OK 8 DVI OK HDMI OK

SERVICE MENU

1.ADJUST

2.SELF_CHK

3.I2C STOP

SPECIFIC SERVICE INSTRUCTIONS

2.1 FEATURES

D.I.S.T. (Digital Image Scaling Technology)

This system uses line interpolation to double the number of scanning lines and achieve high resolution, flicker-free picture.

COLOUR MANAGEMENT

This function ensures dull colours are compensated to produce natural hues.

PICTURE MANAGEMENT

This function makes it easier to see the dark areas when a picture has many dark areas, and makes it easier to see the bright areas when a picture has many bright areas.

ZOOM

This function can change the screen size according to the picture aspect ratio.

DIGITAL VNR

This function cuts down the amount of noise in the original picture.

2.2 MAIN DIFFERENCE LIST

Item PD-Z42DX4 PD-Z42DX4/S

POWER CORD UK type(3pin)

EU type(2pin with Earth) Flat type(with Earth)

INTERFACE PWB LCA10424-22D (SFP-7310A) LCA10424-23D (SFP-7311A)

REGULATOR PWB LCA10426-09C (SFP-9307A) LCA10426-10C (SFP-9319A)

LINE FILTER PWB LCA10427-14A (SFP-9310A) LCA10427-15A (SFP-9311A)

SUB POWER PWB LCA10422-10C (SFP-9314A) LCA10422-11C (SFP-9315A)

DIGITAL SIGNAL PWB LCA10428-44H (SFP-0D310A) LCA10428-45H (SFP-0D311A)

SUPER DIGIPURE

This function uses the latest in digital technology to give you a natural-looking picture.

PULL DOWN

This function displays a cinema film picture more smoothly and naturally on the screen.

3D CINEMA SOUND

You can enjoy sounds with a widerambience.

DIGITAL INPUT

Digital-in will display when any picture signal in Digital-in is displayed.

BBE

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

A.H.S.

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

UK type(3pin) Flat type(with Earth)

2.3 SYSTEM SETTEING

Be sure to carry out the following operation at the end of the procedure.

(1) Press the [DISPLAY] key and [MUTING] key simultaneously,

then enter the SERVICE MODE.

(2) When the Main Menu is displayed, press [2] key to enter

the self check mode.

(3) Turn off the power by pressing the [POWER] key on the

remote control unit.

MAIN MENU SCREEN

SERVICE MENU

1.ADJUST

2.SELF_CHK

3.I2C STOP

SELF CHECK MODE SCREEN

LOB OK FAN OK SYNC M:OK S:OK HD:NG TIM OK MSM OK DIGI 0000 MEM OK AVSW OK YC OK AIO OK TUN OK GCR NG 1 IP OK RGB OK 8 DVI OK HDMI OK

1-6 (No.YA228)

2.4 TECHNICAL INFORMATION

2.4.1 PDP STRUCTURE AND CHARACTERISTIC

This unit uses the flat type panel PDP (Plasma Display Panel), instead of the conventional CRT (Cathode Ray Tube), as a display unit.

2.4.1.1 PIXEL (CELL) ARRAY

PDP is constructed by sealing the xenon, which emits neon and ultraviolet rays for discharging purpose, in between the electrodes lay on the front glass substrate and rear glass substrate. One pixel is composed of 3 RGB cells, with cell pitch of 0.365mm (1 pixel 1.095mm) horizontally and 1.110mm vertically. The cell is arrayed in each RGB color as shown in Fig. 1. One pixel is formed by interlacing each RGB color cell. One cell size is 0.365mm horizontally and 1.110mm vertically.

Direction

Vertically

No.1

Pixel line

No.2

Pixel line

No.767

Pixel line

No.768

Pixel line

Horizontally

No.1 Pixel

sequence

B G R B G R

(Horizontally) Pixel pitch

RBGR

G RBG R

GRBGR

0.897mm

No.2 Pixel

sequence

1 pixel (1 dot)

B Cell

Cell

R Cell

No.1023 No.1024

Pixel

sequence

Pixel

sequence

B GRBG R

BGRBGR

G RBG R

GRBGR

0.299mm

(Horizontally) Cell pitch

0.675mm (Vertically) Pixel pitch (Cell pitch)

Fig.1

2.4.1.2 PIXEL DEFECTS

Though PDP is made by means of ultra precise technology, there are cases whereby not all pixels (cell) will function properly. In some cases, there may be defective pixels that do not light at all or the ones that always light on. There are 3 types of Pixel defects, [Bright Dot Defects], [Dark Dot Defects] and [Flicker Dot Defects], as defined respectively in the following:

(1) BRIGHT FAULT

In this pixel fault, a cell that should not light originally is lighting on and off. For checking this pixel fault, input ALL BLACK SCREEN and find out the cell that is lighting on and off.

(2) DARK FAULT

In this pixel fault, a cell that should light originally is not lighting or lighting with the brightness twice as brighter as originally lighting. For checking this pixel fault, input 100% of each R/G/B colour and find out the cell that is not lighting.

(3) FLICKER FAULT

In the pixel fault, a cell that should light originally or not light originally is flashing on and off. For checking this pixel fault, input ALL BLACK SCREEN signal or 100% of each RGB colour and find out the cell that is flashing on and off.

(No.YA228)1-7

2.4.2 MAIN CPU PIN FUNCTION [IC7501 : DIGITAL SIGNAL PWB ASS'Y]

Pin Pin name I/O Function Pin Pin name I/O Function

1 TCK I Test purpose 65 D2 I/O Program ROM data for main CPU 2 TMS I Test purpose 66 D12 I/O Program ROM data for main CPU 3 TDI I Test purpose 67 D10 I/O Program ROM data for main CPU 4 TDO O Test purpose 68 VSS33 - GND 5 P2.8 O Not used 69 VDD33 I 3.3V 6 P2.9 O Blue for OSD 70 D4 I/O Program ROM data for main CPU 7 P2.10 O Blue for OSD 71 D3 I/O Program ROM data for main CPU 8 P2.11 O Blue for OSD 72 D11 I/O Program ROM data for main CPU

9 P2.12 O Blue for OSD 73 RSTIN I Reset 10 P2.13 O Blue for OSD 74 POWER O Sleep state release for chassis CPU [Relese : L] 11 P2.14 I Not used 75 P3.1 O Not used 12 P2.15 O Request for chassis CPU communication 76 REMOCON I Remote control 13 VSS33 - GND 77 P3.3 I Clock for OSD 14 VDD33 I 3.3V 78 P3.4 O Red for OSD 15 P4.5 O Not used 79 P3.5 O Red for OSD 16 A20 O Program ROM address for main CPU 80 P3.6 O Red for OSD 17 A19 O Program ROM address for main CPU 81 P3.7 O Red for OSD 18 A18 O Program ROM address for main CPU 82 MTST O Data transmission for chassis CPU communication 19 A17 O Program ROM address for main CPU 83 MTSR I Data receive for chassis CPU communication 20 VSS25 - GND 84 VSS33 - GND 21 VDD25 I 2.5V 85 VDD33 I 3.3V 22 A16 O Program ROM address for main CPU 86 VSS25 - GND 23 A8 O Program ROM address for main CPU 87 VDD25 I 2.5V 24 A7 O Program ROM address for main CPU 88 TXD0 O Communication for adjustment 25 A9 O Program ROM address for main CPU 89 RXD0 O Communication for adjustment 26 A6 O Program ROM address for main CPU 90 P3.12 O Red for OSD 27 A5 O Program ROM address for main CPU 91 CLK O Clock for chassis CPU communication 28 A10 O Program ROM address for main CPU 92 P3.15 O Green for OSD 29 A11 O Program ROM address for main CPU 93 P5.14 O Green for OSD 30 A12 O Program ROM address for main CPU 94 P5.15 O Green for OSD 31 VSS33 - GND 95 TRIG_IN O Green for OSD 32 VDD33 I 3.3V 96 TRIG_OUT O Green for OSD 33 A4 O Program ROM address for main CPU 97 P6.2 O Green for OSD 34 A3 O Program ROM address for main CPU 98 P6.3 O I 35 A2 O Program ROM address for main CPU 99 P6.4 I/O I 36 A1 O Program ROM address for main CPU 100 P6.5 O Teletext signal select [Analog RGB : H / Digital RGB : L] 37 A0 O Program ROM address for main CPU 101 IRQ O Not used 38 A13 O Program ROM address for main CPU 102 VSYNC I Vertical sync 39 ARAS/A14 O Program ROM address for main CPU 103 HSYNC I Horizontal sync 40 CAS/A15 O Program ROM address for main CPU 104 41 VSS33 - GND 105 BLANK O Ys for OSD / Teletext 42 VDD33 I 3.3V 106 VDD33 I 3.3V 43 MEMCLK O Clock for memory 107 VSS33 - GND 44 CSSDRAM O Chip select for memory 108 XTAL1 I 6MHz for system clock 45 CLKEN O Clock enable for memory 109 XTAL2 O 6MHz for system clock 46 CSROM O Chip select for memory 110 VSSA - GND 47 RD O Read for memory 111 VDDA I 2.5V 48 UDQM O Control buffer of memory 112 R O R for OSD / Teletext 49 LDQM O Control buffer of memory 113 G O G for OSD / Teletext 50 WR O Write for memory 114 B O B for OSD / Teletext 51 D15 I/O Program ROM data for main CPU 115 VSSA - GND 52 VSS33 - GND 116 VDDA I 2.5V 53 VDD33 I 3.3V 117 CVBS2 I Video for Teletext 54 D7 I/O Program ROM data for main CPU 118 VSSA - GND 55 D0 I/O Program ROM data for main CPU 119 VDDA I 2.5V 56 D14 I/O Program ROM data for main CPU 120 CVBS1B I Video for Teletext 57 D8 I/O Program ROM data for main CPU 121 CVBS1A I Video for Teletext 58 D6 I/O Program ROM data for main CPU 122 VSSA - GND 59 D1 I/O Program ROM data for main CPU 123 VDDA I 2.5V 60 VSS33 - GND 124 KEY1 I Key scan data 1 [ON : H] 61 VDD33 I 3.3V 125 KEY2 I Key scan data 2 [ON : H] 62 D13 I/O Program ROM data for main CPU 126 MECA_SW I Main power ON / OFF control [ON : L] 63 D9 I/O Program ROM data for main CPU 127 P5.3 I Not used 64 D5 I/O Program ROM data for main CPU 128 TMODE I Test purpose

COR/RSTOUT

C bus clock (for main memory)

C bus Data (for main memory)

O Not used

1-8 (No.YA228)

2.4.3 SUB (CHASSIS) CPU PIN FUNCTION [IC7001 : DIGITAL SIGNAL PWB ASS'Y]

Pin Pin name I/O Function Pin Pin name I/O Function

1 LB_PRO O Not used 51 BS_TXD O 2 P_MU O Picture muting [Muting = H] 52 BS_RXD I Not used : Data receive for digital tuner communication 3 JP_CSB O Not used (NC) 53 NC O Not used (NC) 4 A_MU O Audio muting [Muting = H] 54 VREF+ I 3.3V power supply 5 M_MU O Audio muting (for AUDIO OUT) [Muting = H] 55 PDP_TX O 6 PC_SEL O RGB(PC) INPUT select 56 PDP_RX I Data receive for SUB (DRIVE) CPU communication 7 ON_TIMER O POWER INDICATOR (LED) brightness [LOW = L] 57 SDA0 I/O Data for Inter IC (serial) bus : EEP-ROM (IC7002) 8 ILA0 O Not used : LCD back light lighting 58 SCL0 O Clock for Inter IC (serial) bus : EEP-ROM (IC7002)

9 ILA1 O Not used : LCD panel overshoot refresh timing 59 SDA_DVI I/O 10 ILA2 O Not used 60 SCL_DVI O 11 POW_LED O POWER LED lighting [ON = H] 61 AVSS - GND 12 WORD O Not used 62 DIGII_PHOT I 13 MI_CK I Clock for main CPU communication 63 AGC I Not used 14 MI_TX I Data receive for main CPU communication 64 EXT_YS1 I Not used 15 MI_RX O Data transmission for MAIN CPU communication 65 EXT_YS2 I Not used 16 MI_REQ O 17 VDD I 3.3V power supply 67 DIGI_PRO O Not used : For DIGITAL-IN (HDMI) 18 FOSC O Not used (NC) 68 GCR_RST O Not used (NC) 19 VSS - GND 69 GR_ON O Not used (NC) 20 X1 I Not used : Low speed oscillatior 70 SYNC_SEL O Not used : Sync select for digital tuner 21 X0 O Not used : Low speed oscillatior 71 NC O Not used (NC) 22 VDD I 3.3V power supply 72 NC O Not used (NC) 23 OSC1 I System clock osillation (crystal) : 16MHz 73 SBD5 I/O 24 OSC0 O System clock osillation (crystal) : 16MHz 74 SBT5 I 25 MODE I Single chip mode 75 NMI I 3.3V power supply 26 BS1.5CTL O Not used : Digital tuner power / reset control 76 COMP I Not used : AV COMPULINK lll control 27 A92RES O 28 BS_RST O Not used: Reset for Digital tuner power / reset control 78 VSYNC I V. sync pulse 29 LIP_RST O Not used: Reset for Sound delay (Lip sync) 79 WAKE I Reset for sub(chassis) CPU 30 SOFT_OFF O Not used 80 31 VMUTE I Not used: Picture muting request from digital tuner 81 NC O Not used (NC) 32 VOUTENB O Not used: Video cutoff for digital tuner 82 RST I Reset for MAIN CPU [Reset = L] 33 MDR_CON I Not used: System cable connection monitor for PDP 83 VDD I 3.3V power supply 34 AVDD I 3.3V power supply 84 SCL3A O Clock for Inter IC (serial) bus control 35 BS_POW O Not used : Digital tuner power control 85 SDA3A I/O Data for Inter IC (serial) bus control

DsyncSW2

36 37 LB_POW O Not used : Power control for low bias line 87 SDA3B I/O Data for Inter IC (serial) bus control 38 NC O Not used (NC) 88 39 HOTPLUG I 40 MECA_SW I Mechanical monitor for POWER switch [Push = L] 90 DIGI_INT I Not used : Reset for HDMI process [Reset = L ] 41 MAIN_POW O Main power control [ON = L] 91 DVI_RST O Not used : Reset for DVI format conversion 42 MSP_RST O AUDIO OUT output mode select [VARIABLE = L] 92 VSS - GND 43 VREF- I Not used 93 SCL5055 O 44 AFT2 I Not used : AFT voltage for sub tuner 94 45 AFT1 I AFT voltage for VHF/UHF tuner 95 SDA5055 I/O Data for Inter IC (serial) bus : JCC5055 (DIST process) 46 KEY2 I Key scan data for front switch (MENU/CH+/CH-) 96 47 KEY1 I Key scan data for front switch (VOL+/VOL-) 97 NC O Not used (NC) 48 NC O Not used (NC) 98 15K/OTH O Main video select [Fixed = H] 49 NC O Not used (NC) 99 DsyncSW1 O 50 AC_IN I AC power pulse for timer clock 100 57 BUSY I Busy monitor for JCC5057 (New DIST process)

Data request for main CPU communication [Request = L]

Reset for IC1001(3D YC SEP / COLOUR DEMODULAT) [Reset = H]

O Sync select for DIGITAL-IN [Cotrolled with 99-pin] 86 SCL3B O Clock for Inter IC (serial) bus control

Not used : Video communiation monitor for receiver unit (PDP)

66 VDD I 3.3V power supply

77 REMO I Remote control

POWERGOOD

DIGI_SYNCSEL

89 DIGI_LRSW O Not used : For DIGITAL-IN (HDMI)

VFORMATSEL

OSD_MODE_SEL

Not used : Data transmission for digital tuner communication

Data transmission for SUB (DRIVE) CPU communication

Not used : Data for Inter IC (serial) bus for panel communication Not used : Clock for Inter IC (serial) bus for panel communication

Not used: Photo sensor for DIGITAL-IN illegal copy protection

Not used : Data for writing on board (connect CN01P : for Frash ROM type) Not used : Clock for writing on board (connect CN01P : for Frash ROM type)

I Power error detection [NG = H]

O Not used

Clock for Inter IC (serial) bus : JCC5055 (DIST process)

O Not used : Digital tuner clock control

O Not used : OSD mode select

Not used : Sync select for DIGITAL-IN [Cotrolled with 36-pin]

(No.YA228)1-9

SECTION 3

DISASSEMBLY

3.1 DISASSEMBLY PROCEDURE

CAUTION AT DISASSEMBLY:

• Be sure to perform the SYSTEM SETTING on the page 1-6, at the end of the procedure.

• Make sure that the power cord is disconnected from the outlet.

• Pay special attention not to break or damage the parts.

• When removing each board, remove the connectors as required. Taking notes of the connecting points (connector numbers) makes service procedure manageable.

• Make sure that there is no bent or stain on the connectors before inserting, and firmly insert the connectors.

3.1.1 REMOVING THE REAR COVER (Fig.1)

(1) Remove the power cord. (2) Remove the 17 screws [A], the 4 screws [B], the 8 screws

[C] and the 3 screws [D], then remove the REAR COVER.

CAUTION:

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

3.1.2 REMOVING THE TERMINAL COVER AND CENTER COVER (Fig.1)

• Remove the REAR COVER.

(1) Remove the 6 screws [E], then remove the CENTER

COVER.

(2) Remove the 7 screws [F], then remove the CHASSIS

SHIELD COVER.

(3) Remove the 7 screws [G], the 12 screws [H], then remove

the TERMINAL COVER.

3.1.3 REMOVING THE LINE FILTER PWB (Fig.1)

• Remove the REAR COVER. (1) Remove the 3 screw [I], then remove the LINE FILTER

SHIELD.

(2) Remove the 2 screw [J], then remove the INLET

BRACKET.

(3) Disconnect the connector [CN8001

POWER UNIT.

(4) Remove the 5 screw [K], the 2 screw [L] and the 1 screw

[M], then remove the LINE FILTER PWB.

] from the MAIN

1-10 (No.YA228)

+ 23 hidden pages