JVC PD-42X795/S, PD-50X795/Z Service Manual

SERVICE MANUAL

PDP COLOR TELEVISION

YA10020052

PD-42X795/S, PD-50X795

VM-42X795 / VM-50X795

[PLASMA DISPLAY UNIT]

BASIC CHASSIS

FP2

TU-42X795 / TU-50X795

[RECEIVER UNIT]

TABLE OF CONTENTS

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

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

3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-28

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-38

No.YA100

2005/2

SPECIFICATION

Items

Dimensions ( W × H × D ) Plasma Display Unit 116cm × 73.1cm × 10.8cm (45-3/4" × 28-7/8" × 4-1/4") 135cm × 83.6cm × 11cm (53-1/4" × 33" × 4-3/8")

Receiver Unit 43.5cm × 7cm × 31.3cm (17-1/4" × 2-7/8" × 12-3/8")

Mass Plasma Display Unit 38kg (83.6lbs) 51kg (112.2lbs)

Receiver Unit 4.3kg (9.5lbs)

TV RF System (Analog / Digital) Analog

Color System (Analog) NTSC

Sound System (Analog) BTSC (Multi Channel Sound)

Teletext System (Analog) Closed caption (T1-T4 / CC1-CC4)

TV Receiving Channels and Frequency (Analog)

TV / CATV Total Channel 191 Channels

Intermediate Frequency (Analog) Video IF

Color Sub Carrier Frequency (Analog) 3.58 MHz

Power Input AC120V, 60Hz

Power Consumption Plasma Display Unit 387.4W (Max) / 369W (Avg) 491.4W (Max) / 468W (Avg)

Plasma Display Panel (PDP) 42V wide aspect (16:9) 50V wide aspect (16:9) Screen Size Diagonal : 107.5cm (H:933cm × V : 53.3cm) Diagonal : 127.0cm (H:110.7cm × V : 62.2cm) Display Pixels Horizontal : 1024 pixels × Vertical : 768 pixels (XGA) Horizontal : 1365 pixels × Vertical : 768 pixels (W-XGA)

Audio Power Output 20W + 20W

Speaker Main (DD)

Antenna terminal (VHF/UHF, ATSC / DIGITAL CABLE IN) F-type connector, 75Ω unbalanced, coaxial × 2

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

Digital Input Video

Audio Output

Monitor / Recording Output S-Video

PC (RGB) Input D-sub 15pin × 1

Center Channel Input 500mV(rms) (-4dBs), high impedance,RCA pin jack × 1 Sub woo fer Output More than 0 to 1000mV (rms) (+2.2dBs), low impedance (80Hz when modulated 100%), RCA pin jack × 1 Digital Audio Optical Output Digital SPDIF × 1 AV COMPULINK lll 3.5mm mini jack × 1 iLink Input/Output TS In/Out (4-pin, S400) × 2, IEEE1394 compliant DTCP digital copy protection compatible

Display Input / Output (For system cable)

Remote Control Unit RM-C14G (AA/R6 / UM-3 battery × 2)

VHF Low

VHF High

Sound IF

Receiver Unit 39.9W (Max) / 38W (Avg)

Component Video

[INPUT-1/2]

1125i / 750p

525p / 525i

[INPUT-1/3/4]

Control / Audio

CCIR (M)

Digital

ATSC terrestrial / Digital cable

02ch - 06ch : 54MHz - 88MHz 07ch - 13ch : 174MHz - 216MHz

UHF

14ch - 69ch : 470MHz - 806MHz

CATV

54MHz - 804MHz Low Band : 02 - 06 High Band : 07 - 13 Mid Band : 14 - 22 Super Band : 23 - 36 Hyper Band : 37 - 64 Ultra Band : 65 - 94, 100 - 135 Sub Mid Band : 01, 96 - 99

45.75 MHz

41.25 MHz (4.5MHz)

9.5cm × 1cm (3-3/4 × 7-7/16"), oval type × 2

Tweeter

2cm (13/16"), round type × 2

Woofer

13cm × 6.5cm (5-1/8 × 2-9/16"), oval type × 2

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), 75 Ω Pb/Pr : 0.7V(p-p), 75 Ω

S-Video

Mini-DIN 4 pin × 3 Y: 1V (p-p), positive (Negative sync), 75 Ω C: 0.286V (p-p) (Burst signal), 75 Ω

Video

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

Audio

500mV (rms), high impedance, RCA pin jack × 8 HDMI connector × 1

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

Audio

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

RCA pin jack × 2

Variable

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

Fix

500mV(rms), (-4dBs), low impedance (400Hz when modulated 100%) Mini-DIN 4pin × 1

Y: 1V (p-p), 75Ω C: 0.286V(p-p) (burst signal), 75Ω

Video

1V (p-p), 75Ω, RCA pin jack × 1

Audio

250mV(rms) (-10dBs), Fs-18dB 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 : 48.4kHz / Vertical : 60Hz)

D-sub 26-pin connector × 2

Video

DVI-D 24-pin connector × 2

PD-42X795 PD-50X795

Contents

Design & specifications are subject to change without notice.

1-2 (No.YA100)

SECTION 1

PRECAUTION

1.1 SAFETY PRECAUTIONS

(1) The design of this product contains special hardware,

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

(2) Alterations of the design or 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 10kΩ

2W resistor to the anode button.

(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 1000Ω 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 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.YA100)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 OF THE DISPLAY UNIT

8 inch/200 mm

6 inch/150 mm

2 inch/50 mm

SPACE REQUIRED FOR INSTALLATION OF THE RECEIVER UNIT

4 inch/100 mm

POWER

PLASMA DISPLAY RECEIVER

4 inch/100 mm4 inch/100 mm 4 inch/100 mm

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.

6 inch/150 mm

2 inch/50 mm

1-4 (No.YA100)

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.YA100)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.

SMART CAPTION

Smart caption will appear when you press the MUTING button, only on channels where the broadcast contains CLOSED CAPTION information.

SMART SOUND

Decreases high sound levels, giving a regulated sound level.

VIDEO STATUS

Expression of a favorite screen can be chosen by the VIDEO STATUS function.

[STANDARD ↔ DYNAMIC ↔ THEATER ↔ GAME]

DIGITAL INPUT

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

V-CHIP

Since the V-CHIP is built in, it can choose, view and listen to a healthy program.

MTS STEREO

The voice multiplex function of the MTS system is built in. (MTS = Multi channel Television Sound system)

NATURAL CINEMA

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

BBE

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

VIDEO INPUT LABEL

This function is used to label video input connections for the onscreen displays.

A.H.S.

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

2.2 SYSTEM SETTEING

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

(1) Set to 0 minutes using the [SLEEP TIMER] key. (2) Press the [VIDEO STATUS] key and [DISPLAY] key

simultaneously, then enter the SERVICE MODE.

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

the self check mode.

(4) 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.YA100)

2.3 TECHNICAL INFORMATION

2.3.1 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.

2.3.1.1 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 0.280mm (1 pixel 0.810mm) [PD-50X795] / 0.304 mm (1 plxel 0.912 mm) [PD- 42X795] horizontally and 0.810mm [PD-50X795] / 0.693 mm [PD-42X795] 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 0.280mm [PD-50X795] / 0.304 mm [PD-42X795] horizontally and 0.810mm [PD-50X795] / 0.693 mm [PD-42X795] vertically.

Direction

Vertically

Horizontally

No.1

Pixel line

No.2

Pixel line

No.767

Pixel line

No.768

Pixel line

PD-50X795 PD-42X795

No.1365 No.1366

No.1 Pixel

sequence

No.2 Pixel

sequence

No.1023

Pixel

sequence

No.1024

Pixel

sequence

B G R B G R B GRBG R

BGRBGR BGRBGR

1 pixel (1 dot)

0.810mm

0.921mm 0.304mm

(Horizontally) Pixel pitch

B Cell

Cell

R Cell

0.280mm

(Horizontally) Cell pitch

PD-50X795 PD-42X795

0.810mm PD-50X795

0.693mm PD-42X795 (Vertically)

Pixel pitch(Cell pitch)

PD-50X795 PD-42X795

Fig.1

2.3.1.2 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.YA100)1-7

2.3.2 MAIN CPU PIN FUNCTION [IC7601 = DIGITAL SIGNAL PWB ASS'Y : RECEIVER UNIT]

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

1 VHOLD1 I Data slice for main screen closed caption 51 NC O Not used

2 HFLT1 I/O LPF for main screen closed caption video input 52 NC O Not used

3 NC O Not used 53 NC O Not used

4 NC O Not used 54 NC O Not used

5 DIGR0 O R [0] for OSD 55 NC O Not used

6 TB1in I AC power for timer clock 56 NC O Not used

7 REMO I Remote control 57 NC O Not used

8 BYTE I Not used 58 NC O Not used

9 CNVss I CPU programming mode select [Normal = L] 59 NC O Not used

10 DIGG0 O G [0] for OSD 60 NC O Not used

11 DIGB0 O B [0] for OSD 61 NC O Not used

12 RESET I Reset for main CPU [Reset = L] 62 HSYNC I H. sync for OSD

13 Xout O System clock osillation (crystal) : 16MHz 63 NC O Not used

14 Vss - GND 64 VSYNC I V. sync for OSD

15 Xin I System clock osillation (crystal) : 16MHz 65 NC O Not used

16 VccI I 3.3V power supply 66 NC O Not used

17 OSC1 I Clock for OSD 67 NC O Not used

18 OSC2 O Not used 68 NC O Not used

19 INT1 I AV COMPULINK control 69 NC O Not used

20 INT0 I

21 OUT1 O Ys (blanking) for OSD 71 NC O Not used

22 OUT2 O YM (transparence) for OSD 72 NC O Not used

23 NC O Not used 73 NC O Not used

24 NC O Not used 74 NC O Not used

25 NC O Not used 75 NC O Not used

26 NC O Not used 76 NC O Not used

27 CTA2/RTS2 O Not used 77 NC O Not used

28 CLK2 O Not used 78 NC O Not used

29 RxD2 O Data transmission (serial) for digital tuner control 79 NC O Not used

30 TxD2 I Data receive (serial) for digital tuner control 80 NC O Not used

31 SDA2 I/O Not used 81 NC O Not used

32 DIGR1 O R [1] for OSD 82 NC O Not used

33 DIGG1 O G [1] for OSD 83 NC O Not used

34 DIGB1 O B [1] for OSD 84 WAKE O

35 TxD0 I Data receive (serial) for external programming 85 CARD_DET I Card detection for ATSC digital tuner [Detection = L]

36 RxD0 O Data transmission (serial) for external programming 86

37 CLK0 I Clock for external programming 87 SDAM I/O

38 RTS0 O Busy for external programming [Operation = H] 88 SCLM O

39 P5.7 I Not used 89 DIGR2 O R [2] for OSD

40 P5.6 O Not used 90 DIGG2 O G [2] for OSD

41 HOLD I CPU programming hold [Hold = H] 91 DIGB2 O B [2] for OSD

42 P5.4 O Not used 92 NC O Not used

43 P5.3 O Not used 93 KEY2 I Key scan data for display switch button KEY2

44 P5.2 O Not used 94 KEY1 I Key scan data for display switch button KEY1

45 P5.1 O Not used 95 VHOLD2 I Data slice for sub screen closed caption

46 WR O CPU programming mode select [Normal = L] 96 HLF2 I/O LPF for sub screen closed caption video input

47 P4.7 O

48 P4.6 I

49 P4.5 I Clock for sub(chassis) CPU communication (serial) 99 VCCE I 5V power supply

50 P4.4 O Not used 100 CVIN1 I Video(Y) for main screen closed caption

Request for sub(chassis) CPU communication (serial data)

Data transmission for sub(chassis) CPU communication (serial)

Data receive for sub(chassis) CPU communication (serial)

70 NC O Not used

Sleep mode release for sub(chassis) CPU [Release = L]

POWER_SW

97 CVIN2 I Video(Y) for sub screen closed caption

98 TVSETB I Test terminal [L Fixed]

I Power switch (mechanical) detection [Detection = L]

Data for Inter IC (serial) bus control : main memory (IC7602)

Clock for Inter IC (serial) bus control : mainmemory (IC7602)

1-8 (No.YA100)

2.3.3 SUB (CHASSIS) CPU PIN FUNCTION [IC7001 = DIGITAL SIGNAL PWB ASS'Y : RECEIVER UNIT]

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

1 LB_PRO O Not used 51 BS_TXD O Data transmission for digital tuner communication

2 P_MU O Picture muting [Muting = H] 52 BS_RXD I Data receive for digital tuner communication

3 JP_CSB O Not used 53 NC O Not used

4 A_MU O Audio muting (for AUDIO OUT) [Muting = H] 54 VREF+ I 3.3V power supply

5 M_MU O Audio muting (for MONITOR OUT) [Muting = H] 55 PDP_TX O

6 PC_SEL O RGB(PC) INPUT select [ON = H] 56 PDP_RX I Data receive for

7 ON_TIMER O POWER INDICATOR (LED) brightness [LOW = L] 57 SDA0 I/O Data for Inter IC (serial) bus : sub memory (IC7002)

8 ILA0 O Not used 58 SCL0 O Clock for Inter IC (serial) bus : sub memory (IC7002)

9 ILA1 O Not used 59 SDA_DVI I/O Data for Inter IC (serial) bus for panel communication

10 ILA2 O Not used 60 SCL_DVI O Clock for Inter IC (serial) bus for panel communication

11 POW_LED O POWER LED lighting [ON = H] 61 AVSS - GND

12 WORD O Not used 62 DIGI_PHOT I Photo sensor for DIGITAL-IN illegal copy protection

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 DIGITAL-IN voltage detection [Detection = H]

18 FOSC O Not used 68 GCR_RST O Not used

19 VSS - GND 69 GR_ON O Not used

20 X1 I 3.3V power supply 70 SYNC_SEL O Multi screen control [Digital = L]

21 X0 O Not used 71 NC O Not used

22 VDD I 3.3V power supply 72 NC O Not used

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 3.3V power supply 75 NMI I 3.3V power supply

26 BS1.5CTL O Digital tuner power control [ON = H] 76 COMP I Not used

27 A92RES O

28 BS_RST O Reset for Digital tuner [Reset = L] 78 VSYNC I V. sync pulse

29 LIP_RST O Not used 79 WAKE I

30 SOFT_OFF O Not used 80

31 VMUTE I Picture muting request from digital tuner [Muting = L] 81 NC O Not used

32 VOUTENB O Video cutoff for digital tuner [Cufoff = H] 82 RST I Reset for

33 MDR_CON I System cable connection monitor for display unit (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 85 SDA3A I/O Data for Inter IC (serial) bus control

DsyncSW2

37 LB_POW O Not used 87 SDA3B I/O Data for Inter IC (serial) bus control

38 NC O Not used 88

39 HOTPLUG I Video communiation monitor for display unit (PDP) 89 DIGI_LRSW O DIGITAL-IN control

40 MECA_SW I Mechanical monitor for POWER switch [Push = L] 90 DIGI_INT I Reset for HDMI process [Reset = L ]

41 MAIN_POW O Main power control [ON = L] 91 DVI_RST O Reset for DVI format conversion

42 MSP_RST O AUDIO OUT output mode select [VARIABLE = L] 92 VSS - GND

43 VREF- I Standard Voltage (0V) power supply 93 SCL5055 O

44 AFT2 I Not used 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 Not used 96

47 KEY1 I Not used 97 NC O Not used

48 NC O Not used 98 15K/OTH O Main video select [Fixed H]

49 NC O Not used 99 DsyncSW1 O Sync select for DIGITAL-IN [Cotrolled with 36-pin]

50 AC_IN I AC power pulse for timer clock 100 57 BUSY I Busy monitor for JCC5057 (RGB process)

Data request for main CPU communication [Request = L]

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

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

66 VDD I 3.3V power supply

77 REMO I Remote control

POWERGOOD

DIGI_SYNCSEL

VFORMATSEL

OSD_MODE_SEL

Data transmission for panel CPU communication

panel

CPU communication

Data for writing on board (connect CN01P : for Frash ROM type)

Clock for writing on board (connect CN01P : for Frash ROM type)

Sleep mode release for sub(chassis) CPU [Release = L]

I Power error detection NG = H]

sub(chassis)

O Not used

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

O Not used

CPU [Reset = L]

(No.YA100)1-9

2.3.4 PANEL CPU PIN FUNCTION [IC807 = DISPLAY INTERFACE PWB ASS'Y : DISPLAY UNIT]

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

1 SYSTEM0 I PDP size select [0V=50V XGA, 1.75V=42V XGA] 34 NC O Not used

2 SYSTEM3 I PDP maker select [0V=SAMSUNG, 1.75V=LG] 35 NMI I Port for writing on board control [Writing=L]

3 AVCC - 5.0V power suplly 36 A_MU O Audio muting [Muting=H]

4 X2 - Not used 37 HD I Not used

5X1 -GND 38

6 VCL - GND 39 REMO I Not used

7 RES I Reset for panel CPU [Reset=L] 40 LED_POW O POWER LED control [ON=H]

8 TEST I GND 41 P85 I

9 VSS - GND 42 P86 - Emulator connection

10 OSC2 O System clock osillation (crystal) : 16MHz 43 P87 - Emulator connection

11 OSC1 I System clock osillation (crystal) : 16MHz 44 SCK3 O Clock for writing on board

12 VCC - 5.0V power suplly 45 RXD I Data receive for writing on board

13 PW_LOB O Power control [ON=L] 46 TXD O Data trnsmission for writing on board

PANEL_PW_ON

15 NC O Not used 48 NC O Not used

16 NC O Not used 49 RXD2 I Data receive for main CPU communication

17 I2C_STOP O Inter IC (serial) bus stop control [Stop=L] 50 TXD2 O Data transmission for main CPU communication

18 APL_S_CLK O Clock for APS loading [PD-50X795] 51 IRQ O Sleep mode release [Rlease=H]

19 PSCK O Clock for APS writing [PD-50X795] 52 ACTIVE I Power switch (mechanical) detection [Detection=H]

20 PLE O APS loading control [PD-50X795] 53 VD I V. sync pulse

21 CLE O APS writing control [PD-50X795] 54 REC_DET I System cable monitor for receiver unit [Connection=L]

22 PSSC O Data transmission for APS loading [PD-50X795]

23 SDA1 I/O

24 PWM O Not used

25 SCL1 O

26 SDA0 I/O

27 SCL0 O

28 SDA2 I/O

29 SCL2 O

30 SLE O PDP communication control [PD-50X795] 61 AMP_PRO1 I Not used

31 NC I/O Not used 62 EE_CDS I Not used

32 NC O Not used 63 KEY1 I Not used

33 NC O Not used 64 KEY2 I Not used

O Panel power control [ON=L] 47 AC_DET I AC power frequency detection [Detection=H]

Data for Inter IC (serial) bus control : panel memory (IC805)

Clock for Inter IC (serial) bus control : panel memory (IC805)

Data for Inter IC (serial) bus control : Audio control, Temp. sensor

Clock for Inter IC (serial) bus control : Audio control, Temp. sensor

Data for Inter IC (serial) bus control : PDP communication

Clock for Inter IC (serial) bus control : PDP communication

LED_ONTIMER

55 PSS

56 FAN_LOCK I Fan abnormality detection [Detection=L] [PD-50X795]

57 SYSTEM2 I Not used

58 SYSTEM 1 I Fan select [Used=H]

59 THEM_DET I Temp. sensor detection [Detection=H]

(AMP_PRO2)

O POWER LED stand-by control [ON=H]

Emulator connection / Port for writing on board [Writing=H]

I PDP Inter IC (serial) bus communication select

[Permission=H][PD-42X795], Data receive for APS loading [PD-50X795]

IGND

1-10 (No.YA100)

SECTION 3

DISASSEMBLY

3.1 DISASSEMBLY PROCEDURE [DISPLAY UNIT: PD-42X795]

NOTE:

• When exchanging parts etc. with the front side (PDP side) fancing down, place a protection sheet under the DISPALY UNIT to prevent scratches on the front side.

• It is advisable to take notes of the connecting locations (connector numbers) of the removed connectors.

3.1.1 REMOVING THE REAR COVER (Fig.1)

(1) Remove the power cord and system cable. (2) Remove the 9 screws [A] and the 12 screws [B], then

remove the REAR COVER.

3.1.2 REMOVING THE BACK COVER AND SPEAKER HOLDER (Fig.1)

(1) Remove the 8 screws [C], then remove the BACK COVER. (2) Remove the SPEAKER HOLDER.

3.1.3 REMOVING THE TERMINAL COVER (Fig.1.)

• Remove the REAR COVER.

(1) Remove the 6 screws [D], then remove the CHASSIS

SHIELD BRACKET.

(2) Remove the 2 screws [E] and the 5 screws [F], then

remove the TERMINAL COVER.

3.1.4 REMOVING THE LINE FILTER PWB (Fig.1)

• Remove the REAR COVER.

• Remove the CHASSIS SHIELD BRACKET.

• Remove the TERMINAL COVER.

(1) Remove the 2 claws [G], then remove the LINE FILTER

INSULATOR.

(2) Disconnect the connector [CN8001

POWER PWB .

(3) Remove the 2 screws [H] and the 2 screws [I], then remove

the LINE FILTER PWB.

] from the MAIN

3.1.6 REMOVING THE DISPLAY INTERFACE PWB (Fig.1)

• Remove the REAR COVER.

• Remove the CHASSIS SHIELD BRACKET.

• Remove the TERMINAL COVER. (1) Disconnect the connectors [CN00A

[CN00E [CNAH2

(2) Remove the 4 screws [K], the 2 screws [L] ,and the 2

screws [M], then remove the DISPLAY INTERFACE PWB.

3.1.7 REMOVING THE CHASSIS BASE PWB (Fig.1.)

• Remove the REAR COVER.

• Remove the CHASSIS SHIELD BRACKET.

• Remove the TERMINAL COVER.

• Remove the LINE FILTER PWB.

• Remove the AUDIO PWB.

• Remove the DISPLAY INTERFACE PWB. (1) Remove the 2 screws [N], then remove the CHASSIS

BASE PWB.

] / [CN00Q] / [CN00T] / [CN00X] / [CN00V] /

] from the DISPLAY INTERFACE PWB .

] / [CN00C] / [CN00D] /

3.1.5 REMOVING THE AUDIO PWB (Fig.1)

• Remove the REAR COVER.

• Remove the CHASSIS SHIELD BRACKET.

• Remove the TERMINAL COVER. (1) Disconnect the connectors [CN60SL

[CN60SR

(2) Disconnect the connector [CN9001

PWB.

(3) Disconnect the connector [CN00A

from the DISPLAY INTERFACE PWB .

(4) Remove the 4 screws [J], then remove the AUDIO PWB.

] from the AUDIO PWB .

] / [CN60CB] /

] from the SUB POWER

] / [CN00C] / [CN00D]

(No.YA100)1-11

REAR COVER

BACK COVER

CHASSIS SHIELD BRACKET

DISPLAY

INTERFACE

PWB

INSULATOR

AUDIO

PWB

LINE

FILTER

PWB

TERMINAL

COVER

TOP

SPEAKER HOLDER

CHASSIS BASE

SPEAKER HOLDER

Fig.1

1-12 (No.YA100)

3.1.8 REMOVING THE TEMP. SENSOR PWB (Fig.2)

• Remove the REAR COVER. (1) Disconnect the connector [CN800V

SENSOR PWB PWB .

(2) Remove the 1 screw [O], then remove the TEMP.

SENSOR PWB.

3.1.9 REMOVING THE MAIN POWER PWB (Fig.2)

• Remove the REAR COVER. (1) Disconnect the connector [CN8001

/ [CN8005 from the MAIN POWER PWB .

(2) Remove the 8 screws [P], then remove the MAIN POWER

PWB.

(3) Remove the POWER PWB BRACKET and INSULATOR.

3.1.10 REMOVING THE SUB POWER PWB (Fig.2)

• Remove the REAR COVER. (1) Disconnect the connector [CN9001

from the SUB POWER PWB .

(2) Remove the 4 screws [Q], then remove the SUB POWER

PWB.

(3) Remove the INSULATOR.

3.1.11 REMOVING THE DISPLAY SWITCH PWB (Fig.2)

• Remove the BACK COVER.

• Remove the SPEAKER HOLDER. (1) Remove the 2 screws [U] and 3 screws [V], then remove

the DISPLAY SWITCH PWB and CONTROL KNOB.

(2) Disconnect the connector [CN000T

SWITCH PWB .

3.1.12 REMOVING THE DISPLAY LED PWB (Fig.2)

• Remove the BACK COVER.

• Remove the SPEAKER HOLDER.

• Remove the DISPLAY SWITCH PWB. (1) Remove the 2 screws [T], then remove the DISPLAY LED

PWB.

(2) Disconnect the connector [CN000X

LED PWB .

] / [CN8003] / [CN8002] / [CN9001] / [CN8009]

] from the TEMP.

] / [CN8008] / [CN8006]

] / [CN9002] / [CN9005]

] from the DISPLAY

3.1.14 REMOVING THE WOOFER SPEAKER (Fig.2)

• Remove the REAR COVER. (1) Disconnect the connector [CN60CB

PWB.

(2) Remove the 6 screws [V], then remove the WOOFER

SPEAKER UNIT.

(3) Remove the 8 screws [W], then remove the DUCT

COVER.

(4) Remove the 12 screws [X], then remove the WOOFER

BACK COVER.

(5) Remove the 8 screws [Y], then remove the WOOFER

SPEAKER.

3.1.15 REMOVING THE PDP (PANEL) UNIT (Fig.2)

• Remove the REAR COVER.

• Remove the CHASSIS SHIELD BRACKET.

• Remove the TERMINAL COVER.

• Remove the CHASSIS BASE(with each PWB affixed on the CHASSIS BASE).

• Remove the TEMP. SENSOR.

• Remove the MAIN POWER PWB.

• Remove the SUB POWER PWB. (1) Disconnect the connector [CN60SL

[CN60SR] from the AUDIO PWB .

(2) Disconnect the connector [CN00A] / [CN00C] / [CN00D] /

[CN00E [CNAH2] from the DISPLAY INTERFACE PWB.

(3) Remove the 16 screws [Z], then remove the BACK

BRACKET.

(4) Lift the PDP upright and remove it with enough care not to

impose shock to the PDP.

CAUTION:

• Two or more people are required to remove the PDP unit.

• The gas pouring port is covered with the protection

material.In operation, be careful not to damage the gas pouring port.

• Do not touch the front side (glass) of the PDP with your

fingers.

] / [CN00Q] / [CN00T] / [CN00X] / [CN0V] /

] from the AUDIO

] / [CN60CB] /

3.1.13 REMOVING THE DD SPEAKER (Fig.2)

• Remove the REAR COVER.

• Remove the BACK COVER.

• Remove the SPEAKER HOLDER. (1) Disconnect the connector [CN60SR

AUDIO PWB .

(2) Remove the 4 screws [U], then remove the DD SPEAKER.

] / [CN60SL] from the

(No.YA100)1-13

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