JVC LT-26WX84/K Service Manual

SERVICE MANUAL

LCD FLAT TELEVISION

YA08920043

LT-26WX84 /K

BASIC CHASSIS

SB5

POWER

CATV VCR DVD

ASPECT

MULTI SCREEN

INDEX

SPLIT

FREEZE

SWAP SELECT

INPUT 1

123

INPUT 2

456

INPUT 3

789

RETURN+

INPUT 4

100+

THEATER

NATURAL

VIDEO

DIGITAL-IN

PRO

CINEMA

STATUS

D-IN

SLEEP TIMER

DISPLAY SOUND

LIGHT

MUTING

C.C.

VOL VOL

VCR CHANNEL PREV NEXT

REW

REC PAUSE

OPEN CLOSE

BACK

VCR DVD

POWER

TV VCR

FFPLAY

STOP

STILL PAUSE

RM-C13G

TABLE OF CONTENTS

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

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

3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12

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

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-54

No.YA089

2004/3

SPECIFICATION

Items Contents

Dimensions ( W × H × D ) 70.3cm × 56.0cm × 26.0cm (Included stand)

70.3cm × 49.1cm × 9.4cm (TV only)

Mass 22.0kg (Included stand)

19.2kg (TV only)

Power Input AC220V , 60Hz

Power Consumption 155W (Max)

TV RF System CCIR (M)

Color System NTSC

Sound System BTSC (Multi Channel Sound)

Teletext System Closed caption

TV Receiving Channels and Frequency

TV / CATV Total Channel 180 Channels

Intermediate Frequency Video IF

Color Sub Carrier 3.58 MHz

LCD panel 26-inch wide aspect (15:9)

Screen Size Diagonal : 66cm (H:33.9cm × V : 56.6cm) Display Pixels Horizontal : 1280 dots × Vertical : 768 dots (W-XGA)

Audio Power Output 10W + 10W

Speaker 6.6cm, round type × 2 (Oblique corn) Antenna terminal (VHF/UHF) F-type connector, 75Ω unbalanced, coaxial

Video / Audio input Input-1/2/3

Digital-in Video

Monitor output S-Video

Headphone 3.5mm stereo mini jack × 1 Remote Control Unit RM-C13G (AA/R6/UM-3 battery × 2)

Design & specifications are subject to change without notice.

Component Video

VHF Low

VHF High

UHF

CATV

Sound IF

[Input-1]

1125i / 750p

525p / 525i

S-Video

[Input-1/2]

Video Audio

Audio

Video Audio

02ch~06ch : 54MHz~88MHz 07ch~13ch : 174MHz~216MHz 14ch~69ch : 470MHz~806MHz 54MHz~804MHz Low Band : 02~06, A-8 by 02~06&01 High Band : 07~13 by 07~13 Mid Band : A~I by 14~22 Super Band : J~W by 23~36 Hyper Band : W+1~W+28 by 37~64 Ultra Band : W+29~W+84 by 65~94, 100~125 Sub Mid Band : A4~A1 by 96~99

45.75 MHz

41.25 MHz (4.5MHz)

RCA pin jack × 3 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 × 2 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 RCA pin jack × 3

DVI-D 24-pin connector × 1

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

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

1-2 (No.YA089)

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 voltage setting should be checked or adjusted.

(6) 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.

(7) 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

GOOD EARTH GROUND

1500 10W

PLACE THIS PROBE ON EACH EXPOSED ME TAL PAR T

(No.YA089)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.

Ventilation hole

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.

200 mm

1.2.3 INSTALLATION REQUIREMENTS

To ensure safety in an emergency such as an earthquake, and to prevent accidents, ensure that measures are taken to prevent the TV dropping or falling over. Use the supplied screws to firmly attach the supplied hooks (OPTION) to the back of the TV, and use commercially available cord to fix the TV to rigid components such as walls and columns.

Supplied hooks (OPTION)

1.2.4 NOTES ON HANDLING

(1) WHEN TAKING UNIT OUT OF A PACKING CASE

When taking the unit out of a packing case, do not grasp the upper part of the unit. If you take the unit out while grasping the upper part, the LCD PANEL may be damaged because of a pressure. Instead of grasping the upper part, put your hands on the lower backside or sides of the unit.

(2) AS FOR PRESSING OR TOUCHING A SPEAKER

Be careful not to press the opening of the speaker in the lower part of the unit and around them since the decorative sheet on the surface of the openings may be deformed.

150 mm

50 mm

1-4 (No.YA089)

1.3 HANDLING LCD PANEL

1.3.1 PRECAUTIONS FOR TRANSPORTATION

When transporting the unit, pressure exerted on the internal LCD 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 before delivery, such as through explaining the handling instructions to transporters. Ensure that the following requirements are met during transportation, as the LCD panel of this unit is made of glass and therefore fragile:

(1) USE A SPECIAL PACKING CASE FOR THE LCD PANEL

When transporting the LCD panel of the unit, use a special packing case (packing materials). A special packing case is used when a LCD panel is supplied as a service spare part.

(2) ATTACH PROTECTION SHEET TO THE FRONT

Since the front (display part) of the panel is vulnerable, attach the protection sheet to the front of the LCD panel before transportation. Protection sheet is used when a LCD panel is supplied as a service spare part.

(3) AVOID VIBRATIONS AND IMPACTS

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

(4) DO NOT PLACE EQUIPMENT HORIZONTALLY

Ensure that it is placed upright and not horizontally during transportation and storage as the LCD panel is very vulnerable to lateral impacts and may break. During transportation, ensure that the unit is loaded along the traveling direction 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.

1.3.3 PRECAUTIONS FOR REPLACEMENT OF EXTERIOR PARTS

Take note of the following when replacing exterior parts (REAR COVER, FRONT PANEL, etc.):

(1) Do not exert pressure on the front of the LCD panel (filter

surface). It may cause irregular color.

(2) Pay careful attention not to scratch or stain the front of the

LCD panel (filter surface) with hands.

(3) When replacing exterior parts, the front (LCD panel) should

be placed facing downward. Place a mat, etc. underneath to avoid causing scratches to the front (filter surface).

1.3.2 OPTICAL FILTER (ON THE FRONT OF THE LCD PANEL)

(1) 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.

(2) Clean the filter surface by wiping it softly and lightly with a

soft and lightly fuzz cloth (such as outing flannel).

(3) Do not use solvents such as benzene 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. When cleaning the filter, usually use the neutral detergent diluted with water. When cleaning the dirty filter, use water-diluted ethanol.

(4) Since the filter surface is fragile, do not scratch or hit it with

hard materials. Be careful enough not to touch the front surface, especially when taking the unit out of the packing case or during transportation.

(No.YA089)1-5

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

2.1 FEATURES

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

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

• Bullet-in 3 dimension Y/C separate circuit.

• Receive DTV broadcast (1125i / 750p / 525p / 525i)

• Built-in HDCP / Component (Y / Pb / Pr) input.

• Built-in Hyper Sound, BBE circuit.

• DIST is a digital high-definition image processing technology that converts various image input signals such as NTSC(480i), 480p, 720p, and 1080i into a format with the best resolution for a display device such as a plasma display panel, and displays highdefinition images.

2.2 TECHNICAL INFORMATION

2.2.1 LCD PANEL

This unit uses the flat type panel LCD (Liquid Crystal Display) panel that occupies as little space as possible, instead of the conventional CRT (Cathode Ray Tube), as a display unit.

2.2.1.1 STRUCTURE

The LCD panel of the unit is constructed with the metal chassis that surrounds the panel unit and supports the LCD panel part and the backlight part to protect them. The color filter glass and the TFT glass (thin film transistor) are inserted between the front polarizing filter and the rear polarizing filter.

Liquid crystals are inserted between the color filter glass and the TFT glass. Since the gap between the two glasses is only a few µm,

a spacer (bead) is inserted in the gap to retain the gap. The backlight unit is placed behind the LCD panel. Since liquid crystals themselves do not emit light, the backlight as an external light source emits light to the LCD panel from behind through the diffuser. Circuit boards for controlling the LCD panel and the backlight are attached around the back part of the LCD panel unit. Since the unit has the two polarizing filter that are at right angles to each other, the unit adopts "normally black" mode, where light does not pass through the polarizing filter and the screen is black when no voltage is applied to the liquid crystals.

Top chassis

Lower frame

Upper frame

Panel ASSY

Diffuser (including board)

Diffuser supporter

Source board

Lamp supporter

Inverter shield cover

Sield case

Inverter board

Reflection plate

1-6 (No.YA089)

Fig.1 Structure of the LCD panel unit

2.2.1.2 SPECIFICATIONS

The following table shows the specifications of this unit.

Item Specifications Remarks

Maximum dimensions ( W × H × D ) 62.7cm × 38.9cm × 4.9cm

Weight 8.0kg

Effective screen size Diagonal : 66cm (H:33.9cm × V : 56.6cm) 26V type

Aspect ratio 15:9

Drive device/ system a-Si-TFT, active matrix system

Resolution Horizontally 1280 × Vertically 768 × RGB <W-XGA> 2949120 dots in total

Pixel pitch (pixel size) Horizontally:0.4425mm, Vertically:0.4425mm

Displayed color 16777216 colors 256 colors for R, G, and B

Brightness 450cd/m

500cd/m2 at maximum

Contrast ratio 500:1

Response time 16.7ms

View angle Vertically 170°, horizontally 170°

2.2.1.3 PIXEL FAULT

There are three pixel faults - bright fault , dark fault and flicker fault - that are respectively defined as follows.

(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.YA089)1-7

2.2.2 MAIN MICRO COMPUTER (CPU) FUNCTION

Pin No. Pin name I/O Function

1 BS_RXD O Not used

2 MICON_V I Vertical sync for OSD / CLOSED CAPTION

3 LB_PRO I Low B protection detect [Detection : H]

4 NC --- Not used

5 /RST I Reset [Reset : L]

6 HDMI_INT I Not used

7/TEST I3.3V

8 OSD_YS O YS for OSD / CLOSED CAPTION

9 (DPCRST) O Not used

10 BS/DIN O Not used

11 (A_MU)(LED_5) O Not used

12 MICON_H I Horizontal sync for OSD / CLOSED CAPTION

13 (A_MU)(LED_4) O Not used

14 P46,OSDXI --- Not used

15 P45,OSDXO --- Not used

16 (SDA2) I/O Not used

17 AC_IN I AC power (60Hz) for time clock

18 (SCL2) O Not used

19 (TU_POW) O Not used

20 VCOI I LPF input

21 PDO O LPF output

22 /IP_RESET O Reset (L) [Reset : L]

23 OSD_YM O YM for OSD / CLOSED CAPTION

24 OSD_B O B signal output for OSD / CLOSED CAPTION

25 POW_LED O Lighting for power [Lighting : H]

26 OSD_G O G for OSD / CLOSED CAPTION

27 OSD_R O R for OSD / CLOSED CAPTION

28 VRE I Reference voltage

29 IP_ERR I AMDP program load

30 IREF I Reference current

31 COMP I Reference conpare

32 AVDD I 3.3V

33 CLL O Not used

34 VREFLS I Reference voltage (For SUB CCD)

35 SUB_CCD I Not used

36 NC --- Not used

37 VSS I GND

38 MAIN_CCD I Not used

39 VREFHS I Standard voltage (For Main CCD)

40 CLH I Not used

41 VDD/VPP I 3.3V

42 CLKSW1 O IP clock switch [ON : L]

43 CLKSW2 O IP clock switch [ON : L]

44 ON_TIM O Not used

45 SBO01 O Port for writing on board

1-8 (No.YA089)

Pin No. Pin name I/O Function

46 SBD01 I Port for writing on board / Communication (XTD) for SUB CPU

47 SBT1 I Port for writing on board / Communication (RTD) for SUB CPU

48 HP_VOL O Headpone volume control (0V-3.3V)

49 /BS_RESET O Not used

50 HDMI_ASW O Not used

51 BS1.5CTL O Not used

52 ODU_OUT O Not used

53 15/11_SW O Not used

54 ODU_PRO O Not used

55 BS_POW --- Not used

56 BS3.3CTL O Not used

57 AFT2 I Not used

58 /LOB_POW O Low B power control [Detection : H]

59 COMPULING I Not used

60 /POWERGOOD I Power condition check [ON : L]

61 MECHA_SW I Mechanical (POWER) swtich detection [Pussing : L]

62 /MAIN_POW O Main power control [ON : L]

63 NC --- Not used

64 (B1_POW) O Not used

65 AFT1 --- Not used

66 (X_RAY) I GND

67 (EE_CDS) I GND

68 KEY2 I Key scan data [ON : H]

69 KEY1 I Key scan data [ON : H]

70 SCL1 O I

71 SDA1 I/O I

C bus clock (For Main memory)

C bus data (For Main memory)

72 REMO I Remote control data

73 (AP_REQ)(LED_2) O Not used

74 VSS I GND

75 OSC2 O 4MHz oscillation for system clock

76 OSC1 I 4MHz oscillation for system clock

77 VDD I 3.3V

78 SCL0 O I

C bus clock (For general)

79 (AP_CLK)(LED_1) O Not used

80 SDA0 I/O I

C bus data (For general)

81 BSLK(D_CLOCK) O Not used

82 BS_TXD(D_DATA) I Not used

83 NC --- Not used

84 P_MU O Picture muting [Muting : H]

(No.YA089)1-9

2.2.3 SUB MICRO COMPUTER (CPU) FUNCTION

Pin No. Pin name I/O Function

1 (SYSTEM0) I GND

2 (SYSTEM3) I GND

3 AVCC - 5V

4 X2 - Not used

5 X1 - Not used

6 VCL - Internal down voltage

7 RES I Reset [Reset : L]

8 TEST I Operation test for SUB CPU

9 VSS - GND

10 OSC2 O 10MHz oscillation for system clock

11 OSC1 I 10MHz oscillation for system clock

12 VCC - 5V

13 NC O Not used

14 NC O Not used

15 BL_D2 O Back light 20ms delay for LCD panel [On:L]

16 BL_D1 O Back light 10ms delay for LCD panel [On:L]

17 I2C_STOP O Not used

18 BL_ON O Back light reset for LCD panel [Reset:L]

19 NC O Not used

20 NC O Not used

21 NC O Not used

22 NC O Not used

23 SDA1 I/O I

C bus data (For Sub memory)

24 A.DIM O Not used

25 SCL1 O I

26 SDA0 I/O I

27 SCL0 O I

C bus clock (For Sub memory)

C bus data (For general)

C bus clock (For general)

28 NC O Not used

29 NC O Not used

30 NC O Not used

31 NC O Not used

32 NC O Not used

33 NC O Not used

34 NC O Not used

35 NMI I Port for writing on board [Writning:L]

36 NC O Not used

37 (HD) I Not used

38 NC O Not used

39 (REMO) I Not used

40 NC O Not used

41 P85 -/I Not used

42 P86 - Not used

43 P87 - Not used

44 SCK3 O Port for writing on board

45 RXD I Port for writing on board

1-10 (No.YA089)

Pin No. Pin name I/O Function

46 TXD O Port for writing on board

47 (PROTECTOR0) I Not used

48 NC O Not used

49 RXD2 I Port for communication (Main cpu)

50 TXD2 O Port for communication (Main cpu)

51 NC O Not used

52 (ACTIVE) I Not used

53 VD I Vertical sync

54 (REC_DET) I Not used

55 (PSS) I Not used

56 (ALARM) I Not used

57 (SYSTEM2) I Not used

58 (SYSTEM1) I Not used

59 (PROTECTOR1) I Not used

60 (AMP_PRO2) I Not used

61 (AMP_PRO1) I Not used

62 EE_CDS I Not used

63 (KEY_IN1) I Not used

64 (KEY_IN2) I Not used

(No.YA089)1-11

SECTION 3

DISASSEMBLY

3.1 DISASSEMBLY PROCEDURE

NOTE:

Since this model adopts a layer structure, follow the procedure below in disassembling this model. Be careful enough not to damage or scratch parts.

3.1.1 REMOVING THE STAND

(1) Remove the 2 screws [A], and remove the STAND

COVER.

(2) Remove the 4 screws [B], and remove the STAND.

JACK COVER(R)

STAND COVER

3.1.2 REMOVING THE REAR COVER

• Remove the STAND. (1) Remove the JACK COVER (R). (2) Remove the JACK COVER (L). (3) Remove the 7 screws [C], 3 screws [D], and 4 screws [E]

(14 screws in total).

(4) Remove the REAR COVER.

STAND

Fig.3-1-1

REAR COVER

1-12 (No.YA089)

Fig.3-1-2

3.1.3 REMOVING THE FAN BRACKET / REGULATOR PWB / POWER CORD

• Remove the STAND.

• Remove the REAR COVER. (1) Pull out the wire of COOLING FAN (the connector [Y] of the

POWER PWB). (2) Remove the 5 screws [F], and remove the FAN BRACKET. (3) Remove the REGULATOR PWB.

COOLING FAN

(4) Pull out the POWER CORD. (5) Remove 1 screw [G], and remove the POWER CORD

HOLDER.

REGULATOR PWB

FAN BRACKET

POWER CORD

3.1.4 REMOVING THE RECEIVER PWB

• Remove the STAND.

• Remove the REAR COVER. (1) Remove the 3 screws [H] and 3 screws [J] (6 screws in

total). Then, remove the TERMINAL BASE.

(2) Remove the 6 screws [K], and remove the RECEIVER

PWB.

TERMINAL BASE

Fig.3-1-3

RECEIVER PWB

POWER CORD HOLDER

3.1.5 REMOVING THE FRONT CONTROL PWB CONTROL / FRONT SENSOR PWB

• Remove the STAND.

• Remove the REAR COVER. (1) Remove the 2 screws [L], and remove the CONTROL

KNOB.

EARTH

PLATE

(2) Remove the 3 screws [M], and remove the FRONT

CONTROL PWB.

(3) Remove the FRONT SENSOR PWB.

KNOB

Fig.3-1-4

FRONT CONTROL PWB

FRONT SENSOR PWB

Fig.3-1-5

(No.YA089)1-13

3.1.6 REMOVING THE VIDEO PWB / DIGITAL INPUT MODULE PWB

• Remove the STAND.

• Remove the REAR COVER. (1) Remove the 1 screw [N] and 1 screw [P]. Then, remove the

JACK BASE. (2) Remove the 4 screws [Q], and remove the VIDEO PWB. (3) Remove the 2 screws [R], and remove the DIGITAL INPUT

MODULE BASE. (4) Remove the 4 screws [S], and remove the DIGITAL INPUT

MODULE PWB.

CAUTION AT DISASSEMBLY

DIGITAL INPUT MODULE

Prior to disassembly, unplug the power code from the AC outlet without fail. (Turn the power "off".) Short the SB connector INPUT MODULE. (At the time of assembling) Before the rear panel is inserted into the cabinet, release the short-circuit between the SB connector 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.

DIGITAL INPUT MODULE BASE

SB connector

VIDEO PWB

JACK BASE

DIGITAL INPUT MODULE

DIGITAL INPUT MODULE BASE

Fig.3-1-6

[1] pin and [2] pin of the DIGITAL

[1] pin and [2]

3.1.7 REMOVING THE MI-COM & DIST MODULE PWB

• Remove the STAND.

• Remove the REAR COVER.

• DIGITAL INPUT MODULE PWB (1) Remove the 7 screws [T], and remove the VIDEO PWB

BRACKET.

(2) Remove the 4 screws [U], and remove the MI-COM & DIST

MODULE PWB from the VIDEO PWB BRACKET.

1-14 (No.YA089)

MI-COM & DIST MODULE PWB

Fig.3-1-7

VIDEO PWB BRACKET

3.1.8 REMOVING THE POWER PWB

• Remove the STAND.

• Remove the REAR COVER.

• Remove the FAN BRACKET.

• Remove the POWER CORD.

• Remove the RECEIVER PWB. (1) Remove the 4 screws [X], and remove the AV JACK

BRACKET. (2) Remove the 6 screws [Y], and remove the POWER PWB. (3) Remove the 6 screws [Z], and remove the CHASSIS

BASE.

3.1.9 REMOVING THE SPEAKER

• Remove the STAND.

• Remove the REAR COVER.

• Remove the POWER CORD. (1) Remove the 5 screws [a], and remove the SPEAKER BOX.

AV JACK BRACKET

POWER PWB

CHASSIS BASE

Fig.3-1-8

SPEAKER BOX

(2) Remove the 4 screws [b], and remove the SPEAKER (L /

R).

(3) Remove the 4 screws [c], and remove the DUCT COVER/

DUCT BASE.

NOTE:

Since the speaker is attached in a certain direction, attach the speaker in the same correct direction as it has been attached.

Fig.3-1-9A

DUCT BASE/DUCT COVER

SPEAKER(R)

Fig.3-1-9B

SPEAKER(L)

(No.YA089)1-15

3.1.10 REMOVING THE LCD PANEL UNIT

NOTE:

The LCD PANEL is fixed to the FRONT PANEL (at the back side) by using double-side adhesive tapes. To remove the LCD PANEL, remove the adhesive tape on the FRONT PANEL slowly.

• Remove the STAND.

• Remove the REAR COVER.

• Remove the POWER CORD.

• Remove the RECEIVER.

• Remove the FRONT CONTROL PWB.

• Remove the FRONT SENSOR PWB.

• Remove the VIDEO PWB.

• Remove the DIGITAL INPUT MODULE PWB.

• Remove the MI-COM & DIST MODULE PWB.

• Remove the POWER PWB. (1) Remove the 8 screws [d] and the 2 screws [e] (ten screws

in total). Then, remove the LCD PANEL UNIT.

LCD PANEL

Adhesive tape

Fig.3-1-10A

(2) Remove the 2 screws [f], and remove the CENTER

FRAME (x2).

(3) Remove the 2 screws [g] and the 2 screws [h] (4 screws in

total). Then, remove the FRAME (R).

(4) Remove the 2 screws [g] and the 2 screws [h] (4 screws in

total). Then, remove the FRAME (L). (5) Remove the 2 screws [j], and remove the TOP FRAME. (6) Remove the 3 screws [k] and the 2 screws [m] (5 screws in

total). Then, remove the BOTTM FRAME.

CENTER FRAME

FRAME(R)

Fig.3-1-10B

TOP FRAME

FRAME(L)

BOTTOM FRAME

1-16 (No.YA089)

Fig.3-1-10c

3.1.11 REMOVING THE LCD PANEL

3.1.11.1 REMOVING THE CONTROL PWB

• Place the LCD PANEL with its backside facing upward. Be careful not to damage the surface of the screen. (1) Remove the 2 screws [A], and remove the CONTROL

PWB COVER.

(2) Remove the claws in the connectors [FPC RIGHT] and

[FPC LEFT], and pull out to remove the FLEXIBLE PWB.

NOTE:

Be careful not to damage the FLEXIBLE PWB. Especially during assembly procedure, be careful not to insert the FLEXIBLE PWB in the Panel.

(3) Remove the 2 screws [B], and remove the CONTROL

PWB.

[Confirmation after replacement]

• Confirm that voltage of 10 pin (B/L On/Off) in the connector

[CNI1] is approx.5.0V.

• Confirm that the voltage in output of the fuses [F1] and [F2]

in the connector [CNI1] is approx.5.0V.

3.1.11.2 REMOVING THE INVERTER PWB

(1) Remove the 5 screws [C], and remove the INVERTER

PWB COVER.

(2) Pull out and remove the wires from connectors [CN4]-

[CN15] (12 connectors in total).

(3) Remove the 4 screws [D], and remove the INVERTER

PWB.

[Confirmation after replacement]

• Confirm that the voltage in output of the fuses [F1] and [F2] in the connector [CN1] and the fuses [F3] and [F4] in the connector [CN2] is 16V.

• Confirm that the voltage in input of the TRANSFORMER in the Inverter Board is 8V.

• Be careful about high voltage (approx. AC900V) in output.

FUSE

OUTPUT

CONTOROL PWB INVERTER PWB

CONNECTOR

OUTPUT

TRANSFORMER

GND 8V 8V 8V 8V GND

INPUT

TRANSFORMER

FUSE

(F3, F4)

[CN4㨪CN15]

INVERTER PWB

INVERTER PWB COVER

CONTROL PWB COVER

FLEXIBLE

CN2

FUSE

(

)

F1, F2

CN1

PWB

CNI1

LEFT

FRC

RIGHT

CONTROL PWB

FRC

CNT1

FUSE

(F1, F2)

FRONT

(No.YA089)1-17

3.1.11.3 REMOVING THE BACKLIGHT UNIT

NOTE:

Do not carry out the following procedure in a dusty and dirty place. If the surface of LCD GLASS, the surface of DIFFUSER SHEET, and the inside of BACKLIGHT UNIT are dusty or dirty, they cause unevenness of a displayed screen.

• Remove the CONTROL PWB.

• Remove the INVERTER PWB.

• Place the LCD UNIT with the screen facing upward.

(1) Remove the 8 screws [E], 4screws [F], and 4 screws [G]

(16 screws in total), and remove the MAIN CHASSIS.

NOTE:

Be careful not to damage the SOURCE IC and the GATE IC on the side of LCD GLASS when removing the MAIN CHASSIS.

(2) Remove the 6 screws [H] from the top side of the LCD

UNIT.

(3) Remove the 12 screws [I] from the sides of the LCD UNIT.

Then, LCD GLASS, DIFFUSER SHEET, and BACKLIGHT UNIT are removed.

SOURCE IC

GATE IC

FRONT

MAIN CHASSIS

LCD GLASS

DIFFUSER SHEET

1-18 (No.YA089)

BACKLIGHT UNIT

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