JVC LT-42WX70/APT, LT-42WX70/BPT, LT-42WX70/TPT, LT-42WX70/GPT, LT-42WX70/AUPT Service Manual

SERVICE MANUAL

YA700<Rev.001>20096SERVICE MANUAL

LT-42WX70/APT, LT-42WX70/AUPT,

LCD MONITOR

LT-42WX70
LT-42WX70

[RM-C2400] [RM-C2420][RM-C2410]

LT-42WX70 series only [Except LT-42WX70EU]

There may be multiple versions of this TV
model.
The TV version is identified by the letters
next to the model number on the TV's
Rating.(See illustration).
Use the service manual that matches the
version of the TV.

COPYRIGHT © 2009 Victor Company of Japan, Limited

/BPT, LT-42WX70/GPT,
/TPT, LT-42WX70EU/PP

MODEL NAME

LT-42WX70

MODEL NO.

RATING LABEL (REAR)

LABEL indication

LT42WX70APT

LT42WX70UPT
LT42WX70BPT
LT42WX70TPT
LT42WX70GTP

BASIC CHASSIS

MX7

SERVICE MODEL NAME

LT-42WX70/APT

LT-42WX70/AUPT

LT-42WX70/BPT
LT-42WX70/TPT
LT-42WX70/GTP

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

2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

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

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22

COPYRIGHT © 2009 Victor Company of Japan, Limited

TABLE OF CONTENTS

No.YA700<Rev.001>

2009/6

SPECIFICATION

Contents

Items

Dimension (W × H × D) 99.0 cm

Mass 12.0 kg (without the speaker unit and the stand)

Power Input AC110V - AC240 V, 50 Hz / 60 Hz

Power Consumption 175 W

Power consumption (on standby) AC 230 V: 0.7 W, AC 100 V: 0.4 W

LCD panel 42 V-inch wide aspect (16 : 9)

Screen Size Diagonal: 107 cm (H: 93.0 cm × V: 52.3 cm)
Display Pixels Horizontal: 1920 dots × Vertical: 1080 dots

Audio Power Output 10 W + 10 W

Speaker 3.0 cm × 13.0 cm , Bass Reflex Box × 2
INPUT-1/2/3 HDMI Input HDMI connector × 3 (V.1.3, with Deep Color, with x.v.Colour

INPUT-4 RGB input D-sub 3-row 15-pin × 1 (RGB is compatible with DDC2B.)

Video signal G, Y : 1V(p-p) / 75Ω (including sync)

Horizontal sync (HD) HD : 0.3 V(p-p) - 5 V(p-p) / 1 kΩ(positive / negative polarity), 31.469 kHz - 75.000 kHz

Vertical sync (VD) VD : 1 V(p-p) - 5 V(p-p) / 1 kΩ(positive / negative polarity), 60 Hz ± 5 Hz
AUDIO INPUT (INPUT-1/4) 3.5 mm stereo mini jack connector × 1, 500 mV(rms) / high impedance
EXT. SPEAKER OUT Output terminal (L/R), impedance 8 Ω
REMOTE D-sub 2-row 9-pin connector × 1 (RS-232C) (for external serial control)

Remote control unit RM-C2400

Design & specifications are subject to change without notice.

LT-42WX70EU/PP

×

71.68 cm × 17.0 cm [With stand (At the high position)]

×

99.0 cm

99.0 cm

99.0 cm

17.8 kg (including the stand)

19.0 kg (including the speaker unit and the stand)

*When you connect a DVI device to INPUT-2 or INPUT-3, only the video signal is played
back, and the sound signal is not.

B, R, Pb/Cb, Pr/Cr : 0.7V(p-p) / 75 Ω

(AAA/R03 dry cell battery × 2)

68.93 cm × 17.0 cm [With stand (At the middle position)]

×

66.18 cm × 17.0 cm [With stand (At the low position)]

×

59.98 cm × 4.25 cm [Without stand]

LT-42WX70/AUPT

LT-42WX70/BPT
LT-42WX70/GPT

RM-C2410

(AAA/R03 dry cell battery × 2)

LT-42WX70/APT
LT-42WX70/TPT

™, HDMI™ CEC Support)

RM-C2420

(AAA/R03 dry cell battery × 2)

1-2 (No.YA700<Rev.001>)

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) 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.

(6) 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.YA700<Rev.001>)1-3

1.2 SAFETY PRECAUTIONS [FOR UK]

(1) The design of this product contains special hardware and 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 product 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 product have special safety-related characteristics. These characteristics are often

not evident from visual inspection nor can the protection afforded by them necessary 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 the 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) The leads in the products are routed and dressed with ties, clamps, tubing’s, barriers and the like to be separated from live parts,

high temperature parts, moving parts and / or sharp edges for the prevention of electric shock and fire hazard. When service is
required, the original lead routing and dress should be observed, and it should be confirmed that they have been returned to
normal, after re-assembling.

WARNING

(1) The equipment has been designed and manufactured to meet international safety standards.
(2) It is the legal responsibility of the repairer to ensure that these safety standards are maintained.
(3) Repairs must be made in accordance with the relevant safety standards.
(4) It is essential that safety critical components are replaced by approved parts.
(5) If mains voltage selector is provided, check setting for local voltage.

1.3 INSTALLATION

1.3.1 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

*Diagram differs from actual appearance.

1.3.2 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.

150
mm

200
mm

50
mm

200 mm

150
mm

50 mm

*Diagram differs from actual appearance.

1.3.2.1 WHEN FIXING TO FURNITURE

(1) Thread a belt (not supplied) through the hole on the back

of the stand.

(2) Fix the belt to the furniture using a screw.

1. 2.

1-4 (No.YA700<Rev.001>)

*Diagram differs from actual appearance.

1.3.2.2 MOUNTING THE UNIT TO THE WALL

When selecting a wall mounting unit to mount the unit to the wall,
be sure to keep the distance shown in the figure for good heat
dissipation. This note is only about the heat dissipation to main­tain normal operation of the unit, and not about the mounting
strength. Please inquire the manufacturer of the wall mounting
unit for the strength of the mounting unit.

CONDITION 1:

When mounting the unit to the wall, set the metal fittings so
that the distance A shown in Fig. 1 stays less than 90mm.

AA

A: Less than 90mm

Fig.1

CONDITION 2:

When using the metal fittings with 90mm or more distance A,
set the distance between the metal fittings and the rear cover
more than 40mm as shown in Fig. 2.

METAL FITTINGS

1.4 HANDLING LCD PANEL

1.4.1 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.

B

B: More than 40mm

Fig.2

1.3.3 NOTES ON HANDLING

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.

WALL

(No.YA700<Rev.001>)1-5

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

Service Menu

1. Adjust

2. Self Check

3. I2C Bus Stop

POW PRO.
INV PRO.
I2C ANALOG 0 0
I2C DIGITAL 0 0

HOURS

131070 MAX

LAST ERROR 0 0

RESET :OK

(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 COLOUR.

(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.

MAIN MENU SCREEN

Service Menu

1. Adjust

2. Self Check

3. I2C Bus Stop

Press [2] key

1.4.3 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 COLOUR.

(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).

1.4.4 HOW TO CHECK THE OPERATING TIME

This model has a function to count and record the LCD panel
operating time. The operating time can be checked in the
following procedure.

• Maximum count time = 131070 hours

(1) Press [DISPLAY] key and [MUTING] or [INFORMATION]

key on the remote control unit simultaneously to enter the
SERVICE MODE SCREEN.

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

the self check mode.

(3) The operating time of the LCD panel is displayed in 6-digit

decimal number.

SELF CHECK MODE SCREEN

POW PRO.
INV PRO.
I2C ANALOG
I2C DIGITAL

HOURS

LAST ERROR
0

RESET :OK

Switch the display/ non-display
with the [ASPECT/ZOOM] key.

*When the power is turned off with the remote control unit or the power

button of the main unit, the count restarts from the turn off time.

*When the power is turned off by disconnecting the power cord from the

AC outlet, the recorded time count less than 1 hours is not counted.

*When the operating time exceeds the maximum count time, "MAX" is

displayed to the right of the counted time, and the following count is
discontinued.

0
0

The operating time is displayed

131070 MAX

MAX is displayed when the maximum
count time is exceeded

1.4.5 HOW TO RESET THE OPERATING TIME

(1) Press [DISPLAY] key and [MUTING] or [INFORMATION]

key on the remote control unit simultaneously to enter the
SERVICE MODE SCREEN.

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

the self check mode.

(3) When the self check screen(page-1) is displayed, press

[ASPECT(ZOOM)] key.
(4) "RESET : OK" is displayed under the operating time.
(5) Press the [OK] key to reset the operating time.

NOTE:

When the LCD PANEL UNIT is replaced, be sure to reset the
operating time following the above method.

1-6 (No.YA700<Rev.001>)

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

2.1 FEATURES

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.

Colour Management

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

2.2 MAIN DIFFERENCE LIST

Full HD

Full HD models deliver superbly detailed image reproduction
of more than 2 megapixels (1920 x 1080), which represents
double the resolution offered by WXGA panels.

DIGITAL VNR

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

MPEG Noise Reduction

This function effects the block noise removal and mosquito NR
simultaneously.

Item

REMOTE
CONTROL
UNIT

POWER
CORD

2.3 COMPLIANT SIGNAL FORMATS

Classification Signal Name

Composite NTSC,

Component 480/60i 59.94 15.734 ---- 858 525 720 483

LT-42WX70EU/PP LT-42WX70A/PT LT-42WX70G/PT LT-42WX70B/PT LT-42WX70AU/PT LT-42WX70T/PT

RM-C2400 RM-C2420 RM-C2410 RM-C2410 RM-C2410 RM-C2420

Round 2pin

UK 3pin

Italy type

Swiss type

(It depends on

the destination)

NTSC4.43,
PAL60, PAL-M

PAL50, SECAM,
PAL-N

576/50i 50 15.625 ---- 864 625 720 576

480/60p 59.94 31.469 ---- 858 525 720 483

576/50p 50 31.25 ---- 864 625 720 576

720/60p 59.94 44.955 ---- 1650 750 1280 720

720/50p 50 37.5 ---- 1980 750 1280 720

1080/60i 59.94 33.716 ---- 2200 1125 1920 1080

1080/50i 50 28.125 ---- 2640 1125 1920 1080

1080/60p 59.94 67.433 ---- 2200 1125 1920 1080

1080/50p 50 56.25 ---- 2640 1125 1920 1080

1080/30p 29.97 33.716 ---- 2200 1125 1920 1080

1080/24p 24 27 ---- 2750 1125 1920 1080

US 3 pin Round 3pin

UK 3pin

(It depends on the

destination)

Frequency Total region Effective region

Vertical horizontal Dot clock Pixel Line Pixel Line

Hz kHz MHz pixel/line line/frame pixel/line line/frame

59.94 15.734 ---- 858 525 720 483

50 15.625 ---- 864 625 720 576

TISI plug Austraria 3pin Taiwan 3pin

(No.YA700<Rev.001>)1-7

Frequency Total region Effective region

Classification Signal Name

Vertical horizontal Dot clock Pixel Line Pixel Line

Hz kHz MHz pixel/line line/frame pixel/line line/frame

PC (Analog) PC98/56 56.42 24.823 21.05 848 440 640 400

VGA/60 59.94 31.469 25.175 800 525 640 480

VGA/72 72.809 37.861 31.5 832 520 640 480

VGA/75 75 37.500 31.5 840 500 640 480

WVGA/60 60 31.020 33.75 1088 517 848 480

SVGA/60 60.317 37.879 40 1056 628 800 600

SVGA/72 72.188 48.077 50 1040 666 800 600

SVGA/75 75 46.875 49.5 1056 625 800 600

XGA/60 60.004 48.363 65 1344 806 1024 768

XGA/70 70.069 56.476 75 1328 806 1024 768

XGA/75 75.029 60.023 78.75 1312 800 1024 768

WXGA/60(1280) 59.87 47.776 79.5 1664 798 1280 768

WXGA/60(1360) 60.015 47.712 85.5 1792 795 1360 768

WXGA/60(1366) 60.004 48.363 86.715 1793 806 1366 768

SXGA/60 60.02 63.981 108 1688 1066 1280 1024

SXGA+/60 A 60.02 63.981 108 1688 1066 1400 1050

SXGA+/60 B 60 65.220 122.614 1880 1087 1400 1050

720p/60 60 45.000 74.25 1650 750 1280 720

1080p/60 60 67.500 148.5 2200 1125 1920 1080

HDMI 480/60i 59.94 15.734 13.5 858 525 720 483

576/50i 50 15.625 13.5 864 625 720 576

480/60p 59.94 31.469 27 858 525 720 483

576/50p 50 31.25 27 864 625 720 576

720/60p

59.94/60 44.955/45.0

74.176/

74.25

1650 750 1280 720

720/50p 50 37.5 74.25 1980 750 1280 720

1080/60i

59.94/60

33.716/

33.75

74.176/

74.25

2200 1125 1920 1080

1080/50i 50 28.125 74.25 2640 1125 1920 1080

1080/60p

59.94/60

67.433/

67.50

148.352/

148.5

2200 1125 1920 1080

1080/50p 50 56.25 148.5 2640 1125 1920 1080

1080/30p

1080/24p

29.97/30

23.98/24 26.973/27

33.716/

33.75

74.176/

74.25

74.176/

74.25

2200 1125 1920 1080

2750 1125 1920 1080

1080/25p 25 28.125 74.25 2640 1125 1920 1080

1-8 (No.YA700<Rev.001>)

2.4 TECHNICAL INFORMATION

2.4.1 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.
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.

2.4.1.1 SPECIFICATIONS

The following table shows the specifications of this unit.

Item Specifications

Screen Size

Diagonal: 105 cm (H: 93.0 cm × V: 52.3 cm)

Aspect ratio 16 : 9

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

Number of Pixels Horizontally 1920 × Vertically 1080

Pixel pitch (pixel size) H: 0.4845 mm, V: 0.4845 mm

Displayed colour

Brightness 450 cd/m

1073.7M colours

2

Contrast ratio 4000 : 1

Response time (G to G)

6.5 ms

View angle Horizontally: 178°, Vertically: 178°

Surface polarizer Anti-Glare type Low reflective coat

Colour filter Vertical stripe

Backlight Cold cathode fluorescent lamp

Panel interface system

LVDS (Low Voltage Differential Signaling)

2.4.1.2 PIXEL FAULT

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

 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.

 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 color
and find out the cell that is not lighting.

 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 color and find out the cell that is flashing
on and off.

(No.YA700<Rev.001>)1-9

2.4.2 MAIN CPU PIN FUNCTION [IC7301

Pin Pin name I/O Function

1 SDM_D13 I/O Data for SDRAM

2 SDM_D12 I/O Data for SDRAM

3 SDM_D11 I/O Data for SDRAM

4 SDM_D10 I/O Data for SDRAM

5 SDM_D9 I/O Data for SDRAM

6 SDM_D8 I/O Data for SDRAM

7 IVSS - GND

8 GEN_D0 I/O Data for flash memory

9 GEN_D1 I/O Data for flash memory

10 GEN_D2 I/O Data for flash memory

11 GEN_D3 I/O Data for flash memory

12 GEN_D4 I/O Data for flash memory

13 GEN_D5 I/O Data for flash memory

14 GEN_D6 I/O Data for flash memory

15 GEN_D7 I/O Data for flash memory

16 IVDD - +3.3V power supply

17 GEN_D15 I/O Data for flash memory

18 GEN_D14 I/O Data for flash memory

19 GEN_D13 I/O Data for flash memory

20 GEN_D12 I/O Data for flash memory

21 MVSS - GND

22 MVDD - +1.5V power supply

23 GEN_D11 I/O Data for flash memory

24 GEN_D10 I/O Data for flash memory

25 GEN_D9 I/O Data for flash memory

26 GEN_D8 I/O Data for flash memory

27 SDM_DQM0 I Byte enable for SDRAM

28 SDM_DQM1 I Byte enable for SDRAM

29 SDM_CLK I Clock feedback input for SDRAM

30 IVDD - +3.3V power supply

31 SDM_CLK O Clock output for SDRAM

32 IVSS - GND

33 SDM_CKE O Clock enable for SDRAM

34 SDM_WE O Write enable for SDRAM

35 SDM_CAS O CAS for SDRAM

36 SDM_RAS O RAS for SDRAM

37 SDM_CS O Chip enable for SDRAM

38 SDM_BS0 O Bank select for SDRAM

39 SDM_BS1 O Bank select for SDRAM

40 SDM_A10 O Address for SDRAM

41 SDM_A11 O Address for SDRAM

42 SDM_A9 O Address for SDRAM

43 SDM_A8 O Address for SDRAM

44 SDM_A7 O Address for SDRAM

45 SDM_A6 O Address for SDRAM

46 SDM_A5 O Address for SDRAM

47 SDM_A4 O Address for SDRAM

48 IVSS - GND

49 IVDD - +3.3V power supply

50 SDM_A3 O Address for SDRAM

51 SDM_A2 O Address for SDRAM

52 SDM_A1 O Address for SDRAM

53 SDM_A0 O Address for SDRAM

54 VSS - GND

55 VDD - +1.5V power supply

56

57

TCCS_CEDIA_OUT

TCCS_CEDIA_IN

O Serial data transmission for CEDIA/TCCS

I Serial data receive for CEDIA/TCCS

: DIGITAL PWB]

Pin Pin name I/O Function

58 SYSCLKA O Not used

59 SBI1 I Not used

60 SBO1 O Not used

61 AMP_MUTE O Speaker output muting [Muting = L]

62 SBI0 I Not used

63 SBO0 O Not used

64 GEN_A16 O Address for flash memory

65 GEN_A15 O Address for flash memory

66 GEN_A14 O Address for flash memory

67 GEN_A13 O Address for flash memory

68 GEN_A12 O Address for flash memory

69 GEN_A11 O Address for flash memory

70 GEN_A10 O Address for flash memory

71 GEN_A9 O Address for flash memory

72 GEN_A8 O Address for flash memory

73 IVDD - +3.3V power supply

74 IVSS - GND

75 GEN_A19 O Address for flash memory

76 GEN_A20 O Address for flash memory

77 GEN_WE O Write enable for flash memory

78 LVDS_RST O Reset for LVDS drive (IC5121 IC5141) [Reset = L]

79 GEN_A18 O Address for flash memory

80 GEN_A17 O Address for flash memory

81 RTCCNT I Oscillation control for RTC [L fixed]

82 GEN_A7 O Address for flash memory

83 GEN_A6 O Address for flash memory

84 GEN_A5 O Address for flash memory

85 IVSS - GND

86 LVDS_SEL O LVDS select for LCD panel [On = H]

87 BL_DET I Detection for LCD backlight [Error = H]

88 IVDD - +3.3V power supply

89 GEN_A4 O Address for flash memory

90 GEN_A3 O Address for flash memory

91 GEN_A2 O Address for flash memory

92 GEN_A1 O Address for flash memory

93 GEN_OE O Read enable for flash memory

94 FL_CS O Chip select for flash memory

95 GEN_A0 O Address for flash memory

96 VSS - GND

97 NRST I CPU reset [Reset = L]

98 VDD - +1.5V power supply

99 PSCNT O Not used

100 SDA2 I/O I2C bus (data) for audio amp (IC6001) etc.

101 SCL2 O I2C bus (clock) for audio amp (IC6001) etc.

102 SDA1 I/O I2C bus (data) for CAPSENS control (IC7701)

103 SCL1 O I2C bus (clock) for CAPSENS control (IC7701)

104 NTEST I Not used

105 OSD_HD I Horizontal sync for OSD

106 IVSS - GND

107 OSD_XI I Clock for OSD

108 IVDD - +3.3V power supply

109 OSD_VD I Vertical sync for OSD

110 OSD_YM O OSD digital output [YM]

111 OSD_YS O OSD digital output [YS]

112 OSD_R4 O OSD digital output R[4]

113 OSD_R3 O OSD digital output R[3]

114 OSD_R2 O OSD digital output R[2]

1-10 (No.YA700<Rev.001>)

Pin Pin name I/O Function

115 OSD_R1 O OSD digital output R[1]

116 WRITE_SW I Write/load detection for CEDIA/TCCS [Loader

117 OSD_G4 O OSD digital output G[4]

118 OSD_G3 O OSD digital output G[3]

119 OSD_G2 O OSD digital output G[2]

120 OSD_G1 O OSD digital output G[1]

121 G01 I Not used

122

GEN_SYSCLKB

123 OSD_B4 O OSD digital output B[4]

124 OSD_B3 O OSD digital output B[3]

125 OSD_B2 O OSD digital output B[2]

126 OSD_B1 O OSD digital output B[1]

127 IVSS - GND

128 BSW_CTL O Not used

129 IVDD - +3.3V power supply

130 DPMS_HD I Horizontal sync for PC input

131 DPMS_VD I Vertical sync for PC input

132 SDA0A I/O I2C bus (data) for EEPROM (IC7304)

133 SCL0A O I2C bus (clock) for EEPROM (IC7304)

134 VSS - GND

135 RTCXI I Not used

136 RTCXO O Not used

137 VDD - +1.5V power supply

138 RMIN I Remote control

139 ROMCNT I Data bus width select [L fixed]

140 TEST I Not used

141 AVSS1 - GND

142 CVBS0 I Not used

143 AVDD1 - +3.3V power supply

144 VREFL0 I Not used

145 VREFH0 I Not used

146 VCMO0 I Not used

147 IREF0 I Not used

148 VCMO1 I Not used

149 VREFH1 I Not used

150 VREFL1 I Not used

151 CVBS1 I Not used

152 AVSS2 - GND

153 AVDD2 - +3.3V power supply

154 PVDD - +3.3V power supply

155 CLL I Clamp control [H fixed]

156 CLH I Clamp control [L fixed]

157 PVSS - GND

158 IVSS - GND

159 ADIN0 I Not used

160 ADIN1 I Not used

161 LB_PRO I Low-B protect detection [Error protection = H]

162 EE I E. E. sensor [Bright = H]

163 LCD_FRAME O Not used

164 DIN_PHOT I For HDMI

165 CEC_IN I/O Not used

166 P243 O Not used

167 IVSS - GND

168 OSCXO O Oscillation for system clock (10MHz)

169 OSCXI I Oscillation for system clock (10MHz)

170 IVDD - +3.3V power supply

171 TRCD3 O Not used

mode = L]

O Clock for local bus

Pin Pin name I/O Function

172 TRCD2 O Not used

173 TRCD1 O Not used

174 TRCD0 O Not used

175 TRCST O Not used

176 TRCCLK O Not used

177 EXTRG1 I/O For external programming

178 EXTRG0 I/O For external programming

179 SDATA I/O For external programming

180 SCLOCK I For external programming

181 VSS - GND

182 VDD - +1.5V power supply

183

GEN_MYU_CS

184 EDID_WP O For HDMI

185 FTS_KEY1 I Interrupt detection for CAPSENS control (IC7701)

186 AMP_RST O Reset for analog devices (IC6001 IC6401) [Reset = L]

187 DAV_RST O Not used

188 P105 O Not used

189 MYU_INTPZ I Not used

190 DIN_INT I Interrupt detection for HDMI

191 IVDD - +3.3V power supply

192 IVSS - GND

193 MAIN_POW O Power on/off control for main power supply [On = L]

194 LB_POW O Not used

195 LCD_POW O Power on/off control for LCD panel [On = L]

196 PFC_POW O Power on/off control for PFC [On = L]

197 LED_POW O Lighting for POWER LED [On = H]

198 P112 O Not used

199 FTS_XRES O Reset for CAPSENS control (IC7701) [Reset = H]

200 BL_ON O Lighting for LCD backlight [On = H]

201 IVDD - +3.3V power supply

202 IVSS - GND

203 MVSS - GND

204 MVDD - +1.5V power supply

205 SDM_D0 I/O Data for SDRAM

206 SDM_D1 I/O Data for SDRAM

207 SDM_D2 I/O Data for SDRAM

208 SDM_D3 I/O Data for SDRAM

209 SDM_D4 I/O Data for SDRAM

210 SDM_D5 I/O Data for SDRAM

211 SDM_D6 I/O Data for SDRAM

212 SDM_D7 I/O Data for SDRAM

213 IVSS - GND

214 IVDD - +3.3V power supply

215 SDM_D15 I/O Data for SDRAM

216 SDM_D14 I/O Data for SDRAM

I/O Chip select for sub CPU

[On = L/H oscillation]

(No.YA700<Rev.001>)1-11

SECTION 3

DISASSEMBLY

3.1 CAUTION AT DISASSEMBLY

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

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

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

• Be sure to reattach the wire clamps removed during the procedure to the original positions. (Attaching the wire clamps in wrong
positions may affect the performance.)

REFERENCE:

When removing each board, remove the connector if necessary. The operation is easier if you write down the connection points
(connector numbers) of the connector. For connection of each board, refer to the "WIRING DIAGRAM" of the Standard Circuit
Diagram.

3.2 DISASSEMBLY PROCEDURE [SPEAKER ASSY]

3.2.1 REMOVING THE SPEAKER UNIT (Fig.3-1)

(1) Remove the REAR SHEET.
(2) Remove the 4 screw [A].
(3) Remove the SPEAKER UNIT(L/R).

JOINT BRACKET

3.2.2 REMOVING THE JOINT BRACKET (Fig.3-1)

(1) Remove the 2 screws [B].
(2) Remove the JOINT BRACKET.

SPEAKER UNIT

BB

CONN ROD

SPEAKER UNIT

AA

3.3 DISASSEMBLY PROCEDURE [MAIN UNIT]

3.3.1 REMOVING THE REAR COVER (Fig.3-2)

(1) Remove the TERMINAL COVER(L/R).
(2) Carefully peel off the TOP SHEET.
(3) Remove the 4 screws [A], 2 screws [B], 1 screw [C] and 8

screws [D].

(4) Loosen the 2 screws [E] to the same length as the screws

[A]. (So that the lengths a and b become the same.)

(5) Push in the loose screws [E], then remove the REAR

COVERS (L/R) by pulling them up to the direction of the
arrows.

NOTE:

• Store the peeled off TOP SHEET avoiding dust adherence.

• Do not use any substitute double-faced tape other than the

original one used with the TOP SHEET.

AA

REAR SHEET

Fig.3-1

3.3.2 REMOVING THE INVERTER-1 (Fig.3-2)

• Remove the REAR COVER.
(1) Remove the 5 screw [F].
(2) Remove the INVERTER-1.

3.3.3 REMOVING THE INVERTER-2 (Fig.3-2)

• Remove the REAR COVER.
(1) Remove the 12 screw [G].
(2) Remove the INVERTER-2(L/R).

3.3.4 REMOVING THE AC INLET PWB (Fig.3-2)

• Remove the REAR COVER.
(1) Remove the 2 screws [H].
(2) Remove the AC INLET PWB.

1-12 (No.YA700<Rev.001>)

3.3.5 REMOVING THE MAIN POWER PWB (Fig.3-2)

• Remove the REAR COVER.
(1) Remove the 4 screws [I].
(2) Remove the MAIN POWER PWB.

3.3.6 REMOVING THE PFC POWER PWB (Fig.3-2)

• Remove the REAR COVER.
(1) Remove the 6 screws [J].
(2) Remove the PFC POWER PWB.

3.3.7 REMOVING THE SIDE PWB (Fig.3-2)

• Remove the REAR COVER.
(1) Remove the 6 screws [K].
(2) Remove the SIDE PWB.

3.3.8 REMOVING THE CAPSENS PWB (Fig.3-2)

• Remove the REAR COVER.
(1) Carefully peel off the double-faced tape, then remove the

CAPSENS PWB.

3.3.9 REMOVING THE STAND (Fig.3-2)

(1) Remove the 1 screw [L].
(2) Remove the STAND by sliding it to the direction of the

arrow.

3.3.10 REMOVING THE DIGITAL PWB (Fig.3-2)

• Remove the REAR COVER.

• Remove the STAND.
(1) Remove the 12 screws [M] and 1 screw [N].
(2) Remove the CENTER FRAME.
(3) Remove the 1 screw [P] and 7 screws [Q].
(4) Remove the HEAT SINK.
(5) Remove the DIGITAL PWB.

3.3.14 REMOVING THE TERMINAL BASE (Fig.3-2)

• Remove the REAR COVER.

• Remove the STAND.

• Remove the CENTER FRAME.
(1) Remove the 4 screws [U].
(2) Remove the TERMINAL BASE.

3.3.15 REMOVING THE FRONT PANEL (Fig.3-2)

• Remove the REAR COVER.

• Remove the STAND.

• Remove the CENTER FRAME.
(1) Remove the 2 screws [V].
(2) Remove the SPEAKER BRACKET.
(3) Remove the 4 screws [W] and 5 screws [X].
(4) Remove the LCD PANEL UNIT.
(5) Remove the 8 screws [Y] and 2 screws [E].
(6) Remove the SLIDE BRACKET(L/R) from the FRONT

PANEL.

NOTE:

When the FRONT PANEL is removed, 6 COFs (Chip on Film)
on the LCD MODULE are exposed (Fig.3-2).
If a COF is bent and the wiring/chip is broken, the LCD MOD­ULE cannot be used.
When removing/attaching the FRONT PANEL, following cau­tion is required to avoid damaging the COFs:

• Do not grab the COFs with hands.

• Prevent the COFs from being bumped, scratched, or

pinched.
More than one person is required to remove/attach the FRONT
PANEL with caution.

3.3.11 REMOVING THE T-CON PWB (Fig.3-2)

• Remove the REAR COVER.

• Remove the STAND.

• Remove the CENTER FRAME.
(1) Remove the 4 screws [R].
(2) Remove the T-CON SHIELD.
(3) Remove the T-CON PWB.

3.3.12 REMOVING THE SIGNAL PWB (Fig.3-2)

• Remove the REAR COVER.

• Remove the STAND.

• Remove the CENTER FRAME.
(1) Remove the 5 screws [S].
(2) Remove the SIGNAL PWB.

3.3.13 REMOVING THE LED PWB (Fig.3-2)

• Remove the REAR COVER.

• Remove the STAND.

• Remove the CENTER FRAME.
(1) Remove the 1 screw [T].
(2) Remove the LED PWB.

COF(Chip on Film)

(No.YA700<Rev.001>)1-13

TERMINAL

COVER(R)

REAR COVER(L)

AA

b

AA

AA

TERMINAL

COVER(L)

LL

CC

BB

BB

MM

MAIN POWER PWB

MM

STAND ASSY

II

MM

REAR COVER(R)

QQ

SIGNAL PWB

SS

RR

GG

LCD
INVERTER-2

NN

CENTER FRAME

NARROW CONNECTOR

PP

LCD
INVERTER-2

INSULATOR

GG

FF

LCD INVERTER-1

TOP SHEET

HEAT SINK

WIDE CONNECTOR

DD

XX

XX

YY

DIGITAL PWB

COF(Chip on Film)

SPEAKER
BRACKET

DD

SLIDE
BRACKET(R)

T-CON
SHIELD

T-CON PWB

VV

XX

EARTH
STRAP

WW

DD

KK

XX

XX

SIDE PWB

EE

Fig.3-2

COF(Chip on Film)

LCD PANEL UNIT

DD

TT

LED PWB

FRONT PANEL

JJ

PFC POWER
PWB

WW

AC INLET
PWB

YY

DD

INSULATOR

INSULATOR

VV

SPEAKER BRACKET

HH

TERMINAL BASE

CAPSENS PWB

SLIDE BRACKET(L)

EE

UU

EE

a

1-14 (No.YA700<Rev.001>)

3.4 MEMORY IC REPLACEMENT

Service Menu

1. Adjust

2. Self Check

3. I2C Bus Stop

S001 R DRIVE 137
08 PAL50
Full Warm2 0

• This model uses the memory IC.

• This memory IC stores data for proper operation of the video and drive circuits.

• When replacing, be sure to use an IC containing this (initial value) data.

3.4.1 MEMORY IC REPLACEMENT PROCEDURE

1. Power off

Switch off the power and disconnect the power plug from the
AC outlet.

2. Replace the memory IC

Be sure to use the memory IC written with the initial setting
values.

3. Power on

Connect the power plug to the AC outlet and switch on the
power.

4. User setting

Check the user setting items according to the given in page
later. Where these do not agree, refer to the OPERATING
INSTRUCTIONS and set the items as described.

5. SERVICE MODE setting

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

3.4.2 SERVICE MODE SETTING

SERVICE MODE SCREEN

MAIN MENU SCREEN

Service Menu

1. Adjust

2. Self Check

3. I2C Bus Stop

Press [1] key

ADJUSTMENT MODE SCREEN

S001 R DRIVE 137
08 PAL50
Full Warm2 0

Fig.3-3

SETTING ITEM

Setting items Setting Setting items

White balance setting Adjust S001 - S003

Other setting Fix S004 - S013

(No.YA700<Rev.001>)1-15

3.4.3 SETTINGS OF FACTORY SHIPMENT

3.4.3.1 PICTURE MENU SETTING

Setting Data

Setting Item

Dynamic

(Memory2)

Standard

(Memory1)

Theater

(Memory3)

Monitor

(Memory4)

Photo Pro

(Memory5)

Game

(Memory6)

Tint 000000

Tint Setting BY Gain 220000

BY/RY Angle 024000

Color 500000

Contrast 400000

Cotrast Setting Black Stretch High Medium Low Off Off Off

Dynamic DC Offset On On On Off Off Off

Auto Contrast On Off Off Off Off Off

Brightness 000000

Sharpness 10 0 0 -30 0 -15

Enhancer Mode3 Mode3 Mode4 Mode5 Mode5 Mode5

Enhancer Setting Detail 0 -5 0 0 -15 0

H.Sharp 15 10 5 0 -5 0

V.Sharp 15100000

Backlight 30 10 0 0 10 10

Backlight Setting Smart Picture Off On On Off Off On

Dynamic Backlight High Medium Low Off Off Off

Color System Auto Auto Auto Auto Auto Auto

Color Matrix Auto Auto Auto Auto Auto Auto

Color Space PC Monitor Mode=On sRGB sRGB sRGB sRGB sRGB sRGB

PC Monitor Mode=Off Auto Auto Normal Normal sRGB Auto

Color Temperature Cool2 Normal Warm2 Warm2 Warm2 Cool2

White Balance SettingR Drive 000000

G Drive 000000

B Drive 000000

R Cutoff 000000

G Cutoff 000000

B Cutoff 000000

Color Management Mode1 Mode2 Mode3 Off Off Mode2

Color Mngmt. SettingRed Tint 000000

Red Color 000000

Yellow Tint 000000

Yellow Color 000000

Green Tint 000000

Green Color 000000

Cyan Tint 000000

Cyan Color 000000

Skin Tint 000000

Skin Color 000000

Color : Bright Area 000000

Color : Dark Area 000000

Gamma Mode1 Mode2 Mode4 Mode4 Mode4 Mode3

1-16 (No.YA700<Rev.001>)

Setting Data

Setting Item

Dynamic

(Memory2)

Standard

(Memory1)

Theater

(Memory3)

Monitor

(Memory4)

Photo Pro

(Memory5)

Game

(Memory6)

Dynamic Gamma High Medium Low Off Off Medium

Noise Reduction Digital VNR Auto Auto Auto Off Auto Auto

Mpeg NR Low Low Low Off Off Low

3DY/C On On On Off On On

Natural Cinema Auto Auto Auto Off Off Off

Picture Delay Time Normal Normal Normal Normal Normal Middle

PC Monitor Mode Off Off Off Off Off Off

Smart Sensor Off Off Off Off Off Off

Other Real Bit Driver On On On On On On

Clear Motion Drive On On On On Off On

3.4.3.2 SOUND MENU SETTING

Setting Item Setting Data

Bass +2

Treble 0

Balance 0

Auto Volume Control Off

Lip Sync 0

PEQ On

Turn On Volume Current

Volume Limit 50

3.4.3.3 SETUP MENU SETTING

Setting Item Setting Data

Menu Language It depends on the

destination

Front Panel Lock Off

Auto Shut Off On

Aspect / Zoom -

Position Adjustment Center

Power Indicator On

Information / Display On

Input Label -

4:3 Aspect Setting Regular

1080 Auto Setting Full

Input-4Setting PC

PC Setting Sampling Mode STD

WVGA Select 1280 x 768

SXGA/SXGA+ SXGA

H Size 0

V Size 0

Dot Clock 0

Clock Phase 0

PC Position Adjust -

Auto Position Adjustment

-

3.4.3.4 HDMI MENU SETTING

Setting Item Setting Data

Contro with HDMI On

One Touch Play On

Power Off Link On

AMP Control Off

Input-1 Audio AUTO

(No.YA700<Rev.001>)1-17

3.5 REPLACEMENT OF CHIP COMPONENT

3.5.1 CAUTIONS

(1) Avoid heating for more than 3 seconds.
(2) Do not rub the electrodes and the resist parts of the pattern.
(3) When removing a chip part, melt the solder adequately.
(4) Do not reuse a chip part after removing it.

3.5.2 SOLDERING IRON

(1) Use a high insulation soldering iron with a thin pointed end of it.
(2) A 30w soldering iron is recommended for easily removing parts.

3.5.3 REPLACEMENT STEPS

1. How to remove Chip parts

2. How to install Chip parts

[Resistors, capacitors, etc.]

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

alternately melt the solder at each end.

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

[Transistors, diodes, variable resistors, etc.]

(1) Apply extra solder to each lead.

SOLDER

SOLDER

[Resistors, capacitors, etc.]

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

(2) Grasp the chip part with tweezers and place it on the

solder. Then heat and melt the solder at both ends of the
chip part.

[Transistors, diodes, variable resistors, etc.]

(1) Apply solder to the pattern as indicated in the figure.
(2) Grasp the chip part with tweezers and place it on the

solder.

(3) First solder lead A as indicated in the figure.

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

alternately melt the solder at each lead. Shift and remove
the chip part.

NOTE :

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

1-18 (No.YA700<Rev.001>)

A

B

C

(4) Then solder leads B and C.

A

B

C

SECTION 4

Service Menu

1. Adjust

2. Self Check

3. I2C Bus Stop

ADJUSTMENT

4.1 ADJUSTMENT PREPARATION

(1) There are 2 ways of adjusting this TV : One is with the

REMOTE CONTROL UNIT and the other is the
conventional method using adjustment parts and
components.

(2) The adjustment using the REMOTE CONTROL UNIT is

made on the basis of the initial setting values. The
setting values which adjust the screen to the optimum
condition can be different from the initial setting
values.

(3) Make sure that connection is correctly made AC to AC

power source.

(4) Turn on the power of the TV and measuring instruments for

warming up for at least 30 minutes before starting
adjustments.

(5) If the receive or input signal is not specified, use the most

appropriate signal for adjustment.

(6) Never touch the parts (such as variable resistors,

transformers and condensers) not shown in the adjustment
items of this service adjustment.

4.2 PRESET SETTING BEFORE ADJUSTMENTS

Unless otherwise specified in the adjustment items, preset the
following functions with the REMOTE CONTROL UNIT.

Setting item Settings position

Picture Mode Standard

Smart Picture Off

Dynamic Backlight Off

Colour Temp. Normal

Zoom Full

4.3 MEASURING INSTRUMENT AND FIXTURES

• Signal generator (Pattern generator)

• Remote control unit

4.4 ADJUSTMENT ITEMS

 VIDEO CIRCUIT

• WHITE BALANCE (HIGH LIGHT) adjustment

4.5 BASIC OPERATION OF SERVICE MODE

4.5.1 HOW TO ENTER THE SERVICE MODE

(1) Press [INFORMATION(DISPLAY)] key and [MUTING]

key on the remote control unit simultaneously to enter the
SERVICE MODE.

SERVICE MODE

Service Menu

1. Adjust

2. Self Check

3. I2C Bus Stop

4.5.2 HOW TO EXIT THE SERVICE MODE
Press the [MENU] key to exit the Service mode.

4.5.3 SERVICE MODE SELECT KEY LOCATION

[Function/] key

Scrolling up / down the
setting value.

[FUNCTION /] key

Select the setting item.

[MUTING] key +
[INFORMATION] key

Enter The Factry Mode.

[LT-42WX70EU/PP] [LT-42WX70/AUPT]

Select the setting item.

Enter The Factry Mode.

[Function/] key

Scrolling up / down the
setting value.

[FUNCTION /] key

[MUTING] key +
[INFORMATION
(DISPLAY)] key

[LT-42WX70/BPT]

[LT-42WX70/GPT]

[Function/] key

Scrolling up / down the
setting value.

[FUNCTION /] key

Select the setting item.

[MUTING] key +
[DISPLAY] key

Enter The Factry Mode.

[LT-42WX70/APT]
[LT-42WX70/TPT]

(No.YA700<Rev.001>)1-19

4.5.4 ADJUSTMENT MODE

S001 R DRIVE 137
08 PAL50
Full Warm2 0

This mode is used to adjust the VIDEO CIRCUIT.

4.5.4.1 HOW TO ENTER THE ADJUSTMENT MODE

When the SERVICE MENU SCREEN of SERVICE MODE is
displayed, press [1] key to enter the ADJUSTMENT MODE.

4.5.5 DESCRIPTION OF STATUS DISPLAY

ADJUSTMENT MODE

SETTING ITEM No.

S001 R DRIVE 137
08 PAL50
Full Warm2 0

HDMI DEEP COLOR (BIT)

SETTING ITEM

ZOOM MODE

SETTING VALUE (DATA)

COLOUR TEMP.(WHITE BALANCE)

SIGNAL SYSTEM

DWXGA1366*768 : Digital WXGA1366*768
DSXGA1280*1024 : Digital SXGA1280*1024
DSXGA+1400*1050A : Digital SXGA+1400*1050A
DSXGA+1400*1050B : Digital SXGA+1400*1050B
D720p60 : Digital 720p 60Hz
D1080p60 : Digital 1080p 60Hz
PC98 640*400 56p : PC98 640*400 56Hz
PCVGA : PC VGA
PCVGA640*480 72p : PC VGA 640*480 72Hz
PCVGA640*480 75p : PC VGA 640*480 75Hz
PCWVGA852*480 : PC WVGA852*480
PCSVGA800*600 : PC SVGA800*600
PCSVGA800*600 72p : PC SVGA800*600 72Hz
PCSVGA800*600 75p : PC SVGA800*600 75Hz
PCXGA1024*768 : PC XGA1024*768
PCXGA1024*768 70p : PC XGA1024*768 70p
PCXGA1024*768 75p : PC XGA1024*768 75p
PCWXGA1280*768 : PC WXGA1280*768
PCWXGA1360*768 : PC WXGA1360*768
PCWXGA1366*768 : PC WXGA1366*768
PCSXGA1280*1024 : PC SXGA1280*1024
PCSXGA+1400*1050A : PC SXGA+1400*1050A
PCSXGA+1400*1050B : PC SXGA+1400*1050B
PC720p60 : PC 720p 60Hz
PC1080p60 : PC 1080p 60Hz
HDMI NG : ­YPbPr NG : ­PC NG : -

(1) SIGNAL SYSTEM

The currently input signal is displayed.

PAL50 : PAL50Hz
PAL60 : PAL60Hz
SECAM : SECAM
NTSC3 : NTSC3.58
NTSC4 : NTSC4.43
PALM : PAL M
PALN : PAL N
A480i : Analog 480i
A480p : Analog 480p
A576i : Analog 576i
A576p : Analog 576p
A720p50 : Analog 720p 50Hz
A720p60 : Analog 720p 60Hz
A1080i50 : Analog 1080i 50Hz
A1080i60 : Analog 1080i 60Hz
A1080p50 : Analog 1080p 50Hz
A1080p60 : Analog 1080p 60Hz
A1080p24 : Analog 1080p 24Hz
A1080p30 : Analog 1080p 30Hz
H480i : HDMI 480i
H480p : HDMI 480p
H576i : HDMI 576i
H576p : HDMI 576p
H720p50 : HDMI 720p 50Hz
H720p60 : HDMI 720p 60Hz
H1080i50 : HDMI 1080i 50Hz
H1080i60 : HDMI 1080i 60Hz
H1080p50 : HDMI 1080p 50Hz
H1080p60 : HDMI 1080p 60Hz
H1080p24 : HDMI 1080p 24Hz
H1080p25 : HDMI 1080p 25Hz
H1080p30 : HDMI 1080p 30Hz
HVGA : HDMI VGA
D480i : Digital 480i
D480p : Digital 480p
D576i : Digital 576i
D576p : Digital 576p
D720p50 : Digital 720p 50Hz
D1080i50 : Digital 1080i 50Hz
D1080i60 : Digital 1080i 60Hz
D1080p50 : Digital 1080p 50Hz
DVGA : Digital VGA
DWVGA852*480 : Digital WVGA852*480
DSVGA800*600 : Digital SVGA800*600
DXGA1024*768 : Digital XGA1024*768
DWXGA1280*768 : Digital WXGA1280*768
DWXGA1360*768 : Digital WXGA1360*768

(2) SCREEN MODE

The currently selected ZOOM/ASPECT is displayed.

Full : Full
Pano : Panorama, Panorama zoom
16 : 9 : 16:9 zoom
16 : 9S : 16:9 zoom subtitle
Slim : Regular, Slim
14 : 9 : 14:9 zoom
FullN : Full Native
Just : Just
1 : 1 : 1 : 1

(3) WHITE BALANCE

The currently selected WHITE BALANCE is displayed.

COOL1 : COOL1
COOL2 : COOL2
NORMAL : NORMAL
WARM1 : WARM1
WARM2 : WARM2

(4) HDMI DEEP COLOR (BIT)

The HDMI input DEEP COLOR is displayed.

08 : 8 bit
10 : 10 bit
12 : 12 bit

(5) SETTING ITEM NAME

The setting item name is displayed. The setting item numbers
to be displayed are listed below.

Setting items Settings Item No.

Video system setting Adjust S001 - S003

Fix S004 - S012

(6) SETTING ITEM NO.

The setting item number is displayed. For the setting item
names to be displayed, refer to "Initial setting value of
adjustment mode".

(7) SETTING VALUE (DATA)

The setting value is displayed.

1-20 (No.YA700<Rev.001>)

4.5.6 CHANGE AND MEMORY OF SETTING VALUE

 SELECTION OF SETTING ITEM

• [FUNCTION /] key.

For scrolling up / down the setting items.

 MEMORY OF SETTING VALUE (DATA)

Changed setting value is memorized by pressing [MUTING]
key.

 CHANGE OF SETTING VALUE (DATA)

• [FUNCTION /] key.

For scrolling up / down the setting values.

4.6 INITIAL SETTING VALUES IN THE SERVICE MODE

• Perform fine-tuning based on the "initial values" using the remote control when in the Service mode.

• The "initial values" serve only as an indication rough standard and therefore the values with which optimal display can be achieved
may be different from the default values. But, don't change the values that are not written in "ADJUSTMENT PROCEDURE". They
are fixed values.

4.6.1 VIDEO SYSTEM SETTING

Item No. Display Variable range Setting value

S001 R DRIVE 0 - 255 137

S002 G DRIVE 0 - 255 137

S003 B DRIVE 0 - 255 137

S004 PATTERN 0 - 0F ---

S005 Y 11:8 0 - 0F ---

S006 Y 7:0 0 - FF ---

Item No. Display Variable range Setting value

S008 Pb 7:0 0 - FF ---

S009 Pr 11:8 0 - 0F ---

S010 Pr 7:0 0 - FF ---

S011 CH TIME 0 - 255 ---

S012 LANGUAGE 0 - 31 ---

S013 JP 0 - 255 ---

S007 Pb 11:8 0 - 0F ---

4.7 ADJUSTMENT PROCEDURE

4.7.1 VIDEO CIRCUIT

Item

WHITE
BALANCE

Measuring
instrument

Remote
control unit

Test point Adjustment part Description

(HIGHLIGHT)

Signal
generator

[1.ADJUST]
S001: R DRIVE (Red drive)
S002: G DRIVE (Green drive)
S003: B DRIVE (Blue drive)

(1) Input a 75% all white signal from HDMI terminal.
(2) Load does Preset of "Standard" with Load

Preset in the Picture setting Menu.
(3) Set ZOOM(ASPECT) to "Full".
(4) Select "1.ADJUST" from the SERVICE MODE.
(5) Adjust to Keep one of <S001>, <S002> or

<S003> unchanged, then lower the other two so

that the all-white screen is equally white

throughout.

NOTE:

Set one or more of <S001>, <S002>, and

<S003> to "137".

(6) Check that white balance is properly tracked

from low light to high light. If the white balance

tracking is deviated, adjust to correct it.
(7) Press the [MUTING] key to memorize the set

value.

NOTE:

Separate information will be given for accurate ad­justments (gamma adjustment, tracking adjust­ment) as they require special jig and software.

(No.YA700<Rev.001>)1-21

SECTION 5

Service Menu

1. Adjust

2. Self Check

3. I2C Bus Stop

POW PRO.
INV PRO. 1 1
I2C ANALOG 0 0
I2C DIGITAL

HOURS

0000002

LAST ERROR 1 1

TROUBLESHOOTING

5.1 SELF CHECK FEATURE

5.1.1 OUTLINE

This unit comes with the "Self check" feature, which checks the
operational state of the circuit and displays/saves it during
failure.Diagnosis is performed when power is turned on, and
information input to the main microcomputer is monitored at all
time.Diagnosis is displayed in 2 ways via screen display and LED
flashes. Failure detection is based on input state of I

2

C bus and

the various control lines connected to the main microcomputer.

5.1.2 HOW TO ENTER THE SELF CHECK MODE

(1) Press [INFORMATION(DISPLAY)] key and [MUTING]

key on the remote control unit simultaneously to enter the
SERVICE MODE.

(2) Press the [2] key SELF CHECK MODE.

5.1.3 HOW TO EXIT THE SELF CHECK MODE
To Save Failure History:

Turn off the power by unplugging the AC power cord plug when
in the Self check display mode.

To Clear (Reset) Failure History:

Turn off the power by pressing the [POWER] key on the remote
control unit when in the Self check display mode.

5.1.4 FAILURE HISTORY

Failure history can be counted up to 9 times for each item. When
the number exceeds 9, display will remain as 9. Failure history
will be stored in the memory unless it has been deleted.

5.1.5 POINTS TO NOTE WHEN USING THE SELF CHECK
FEATURE

In addition to circuit failures (abnormal operation), the following
cases may also be diagnosed as "Abnormal" and counted.

(1) Temporary defective transmissions across circuits due to

pulse interruptions.

(2) Misalignment in the on/off timing of power for I

2

C bus (Vcc)

when turning on/off the main power.
Therefore, turn on the main power, and then wait for about 3
seconds before starting Self check.
If recurrences are expected, ensure to clear (reset) the failure
history and record the new diagnosis results.

MAIN MENU SCREEN

Service Menu

1. Adjust

2. Self Check

3. I2C Bus Stop

Press [2] key

SELF CHECK MODE SCREEN

POW PRO.
INV PRO.
I2C ANALOG
I2C DIGITAL

0000002

HOURS
LAST ERROR
0

2

Failure history

0

Refer to SECTION1

Last power-off factor.

Fig.5-1

1-22 (No.YA700<Rev.001>)

5.1.6 DETAILS

Diagnosi

Detection item Display Detection content

s signal

Detection timing

(line)

Low bias line short
protection

POW PRO. Confirm the operation of the

low bias protection circuit.

LB_PRO Detection starts 3 seconds after the power is

turned on. If error continues between 200 ms
the power is turned off.

Panel error detect INV PRO. Abnormality and connector

omission of inverter substrate.

BL_DET It puts into the state of the standby when

BL_DET is HIGH after about 3sec after BL_ON
becomes HIGH, and LED is blinked.
(It restores it in power-off/on.)

Devices on the ANALOG
PWB

Devices on the DIGITAL
PWB

Use time of LCD panel
lamp.

I2C ANALOG Confirmation of reply of ACK

2

I2C DIGITAL

signal which uses I
communication.

HOURS The LCD panel use time is

counted.

C

SDA

BL_ON It is displayed by the decimal number on an

Detection starts 3 seconds after the power is
turned on. If it checks whenever I2C
communication is performed and no reply of
ACK signal an error will be counted.

hour basis. (Refer to SECTION 1: HOW TO
CHECK THE OPERATING TIME)

Last power off situation LAST ERROR Display the factor that the

power supply is turned off by
the figure.

--- 0: Normal
1: Low bias line short protection
9: Panel error detect

5.1.7 METHOD OF DISPLAY WHEN A RASTER IS NOT OUTPUT

In the state where a raster is not output by breakdown of the set, an error is displayed by blink of the POWER LED.

Type of error POWER LED flash cycle

Low bias line short protection POWER LED turnig on and off at 1 sec intervals.

Panel error detect POWER LED turnig on and off at 300msec intervals.

<Explanation of operation>

If error is detected, the power is turned off.
Shortly after a power is turned off, POWER LED will be blinked.
Power cannot be turned on until the power cord takes out and inserts, after a power is turned off.

(No.YA700<Rev.001>)1-23

Victor Company of Japan, Limited

Display Division 12, 3-chome, Moriya-cho, Kanagawa-ku, Yokohama-city, Kanagawa-prefecture, 221-8528, Japan

(No.YA700<Rev.001>)

Printed in Japan

VSE

MODEL NO

.

RATING LABE

L

(REAR

)

LT42WX70APT

LT42WX70UPT

LT42WX70BPT

LT42WX70TPT

LT42WX70GTP

LT-42WX70/APT

LT-42WX70/AUPT

LT-42WX70/BPT

LT-42WX70/TPT

LT-42WX70/GTP

LT-42WX70

LT-42WX70 series only [Except LT-42WX70EU]

SCHEMATIC DIAGRAMS

LCD MONITOR

LT-42WX70/APT, LT-42WX70/AUPT,
LT-42WX70
LT-42WX70

[RM-C2400] [RM-C2420][RM-C2410]

There may be multiple versions of this TV
model.
The TV version is identified by the letters
next to the model number on the TV's
Rating.(See illustration).
Use the service manual that matches the
version of the TV.

/BPT, LT-42WX70/GPT,
/TPT, LT-42WX70EU/PP

DVD-ROM No.SML2009Q1

MODEL NAME

LABEL indication

BASIC CHASSIS

MX7

SERVICE MODEL NAME

COPYRIGHT © 2009 Victor Company of Japan, Limited.

No.YA700<Rev.001>

2009/6