JVC LT-26WX84/SJ Service Manual

YA003200310

SERVICE MANUAL

LCD FLAT TELEVISION

LT-26WX84/SJ

POWER

TV

CATV VCR DVD

ASPECT

MULTI SCREEN

INDEX

SPLIT

FREEZE

SWAP SELECT

INPUT 1

V1

123

INPUT 2

V2

456

INPUT 3

V3

789

RETURN+

INPUT 4

100+

TV

0

V4

THEATER

NATURAL

VIDEO

DIGITAL-IN

PRO

CINEMA

STATUS

D-IN

SLEEP TIMER

DISPLAY SOUND

LIGHT

+

MUTING

C.C.

C.C.

VOL VOL

MENU

VCR CHANNEL
PREV NEXT

REW

REC PAUSE

OPEN CLOSE

CH

OK

CH

BACK

VCR DVD

POWER

TV VCR

FFPLAY

STOP

STILL PAUSE

RM-C13G

P

OW

E

R

BASIC CHASSIS

SB5

TABLE OF CONTENTS

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

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

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

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-52

COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LIMITED

No.YA003

2003/10

SPECIFICATION

Items Contents

Dimensions ( W × H × D ) 103.5cm × 64cm × 9.8cm (40-13/16" × 25-1/4" × 3-7/8")
Mass 22 kg (48.5 lbs)
TV RF System CCIR (M)
Color System NTSC
Sound System BTSC (Multi Channel Sound)
TV Receiving Channels

and Frequency

TV / CATV Total Channel 180 Chann els
Intermediate Frequency Video IF

Color Sub Carrier 3.58 MHz
Power Input AC120V , 60Hz
Power Consumption 155W (Max)
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 : 0.35V(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.YA003)

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 cir cuitry of the pr oducts shou ld n ot 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 me chanical 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 w hich 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 part s list of Service
manual may cause shock, fire, or other hazards.

(4) Use isolation transformer when hot chassis.

The chassis and any sub-chassis contained in some products are
connected to one side of the AC power line. An isolation
transformer of adequate capacity should be inserted between the
product and the AC power supply point while performing any
service on some products when the HOT chassis is exposed.

(5) Don't short between the LIVE side ground and ISOLATED (NEU-

TRAL) 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 L IVE : ( ) 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 measu re 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.

(6) If any repair has been made to the chassis, it is recommended that

the B1 setting should be checked or adjusted (See B1 POWER
SUPPLY check).

(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 lea d 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 1100V AC
(r.m.s.) for a period of one second.

(. . . . Withstand a voltage of 1100V AC (r.m.s.) to an appliance rat-

ed 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
METAL PART

(10) High voltage hold down circuit check.

After repair of the high voltage hold down circuit, this circuit shall
be checked to operate correctly.See item "How to check the high
voltage hold down circuit".

This mark shows a fast
operating fuse, the
letters indicated below
show the rating.

A V

POWER CORD
REPLACEMENT WARNING.

Connecting the white line side of power
cord to "WHT" character side.

PWB

White line side

WHT

PW

(No.YA003)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 ensu re
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 sta nds.Take
precautionary measures to prevent the unit from tipping in order
to protect against accidents and earthquakes.

200 mm

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

150 mm

50 mm

1-4 (No.YA003)

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 sp are
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 o n 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 wip ing it softl y and li ghtly 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.YA003)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 su ch 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 p anel unit and supports the LCD p anel 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 u nit adopts "normally black" mode, where lig ht
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.YA003)

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

2

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.YA003)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 use d
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.YA003)

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 dete ction [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]

2

70 SCL1 O I
71 SDA1 I/O I

C bus clock (For Main memory)

2

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

2

78 SCL0 O I

C bus clock (For general)
79 (AP_CLK)(LED_1) O Not used

2

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.YA003)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

2

23 SDA1 I/O I

C bus data (For Sub memory)

24 A.DIM O Not used

2

25 SCL1 O I
26 SDA0 I/O I
27 SCL0 O I

C bus clock (For Sub memory)

2

C bus data (For general)

2

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.YA003)

Pin No. Pin name I/O Function

46 TXD O Po rt 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.YA003)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 COV-

ER.

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

JACK COVER(R)

JACK COVER(R)

STAND COVER

A

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 scre ws [E]

(14 screws in total).

(4) Remove the REAR COVER.

B

STAND

Fig.3-1-1

C

REAR COVER

E

E

C

E

D

C

D

D

C

E

C

C

C

1-12 (No.YA003)

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

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 scre ws in

total). Then, remove the TERMINAL BASE.

TERMINAL BASE

H

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

PWB.

F

FAN BRACKET

F

POWER CORD

G

G

G

POWER CORD HOLDER

Fig.3-1-3

K

RECEIVER PWB

K

J

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

L

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

CONTROL PWB.

(3) Remove the FRONT SENSOR PWB.

KNOB

Fig.3-1-4

M

FRONT CONTROL PWB

FRONT SENSOR PWB

T

U

T

CLAMP

HARNES( F,U,T),"S" WIRE

F

Fig.3-1-5

(No.YA003)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

1

3

5

SB
connector

2

4

6

VIDEO PWB

Q

N

P

S

JACK BASE

DIGITAL INPUT
MODULE

DIGITAL INPUT
MODULE BASE

R

Fig.3-1-6

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

[1] pin and [2]

3.1.7 REMOVING THE MI-C OM & 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.YA003)

U

MI-COM & DIST
MODULE PWB

T

Fig.3-1-7

VIDEO PWB BRACKET

T

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

Y

Q

P

X

Y

POWER PWB

Z

CHASSIS BASE

Z

Fig.3-1-8

a

SPEAKER BOX

a

(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

c

b

SPEAKER(R)

Fig.3-1-9B

c

b

SPEAKER(L)

(No.YA003)1-15

3.1.10 REMOVING THE LCD PANEL UNIT

• 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.

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

FRAME (x2).

LCD PANEL

d

CENTER FRAME

a

d

e

d

e

Fig.3-1-10A

f

(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.

f

X

P

Q

Fig.3-1-10B

g

FRAME(R)

h

j

TOP FRAME

h

FRAME(L)

h

g

BOTTOM FRAME

1-16 (No.YA003)

m

Fig.3-1-10c

3.2 MEMORY IC REPLACEMENT

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

SERVICE MENU

SERVICE MENU

1.PICTURE/SOUND

2.YC SEP

3.WHITE BALANCE

4.MEMORY SETUP

5.DD/CM

6.

7.PANEL

8.PP

9.IP

0.HDMI

3.2.1 MEMORY IC REPLACEMENT PROCEDURE

(1) Power off

Switch off the power and disconnect the power cord from
the wall outlet.

(2) Replace the memory IC

Initial value must be entered into the new IC.

(3) Power on

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

(4) SERVICE MODE setting

Before entering the SERVICE MODE, confirm that the setting
of TV/CATV SW of the REMOTE CONTROL UNIT is at the
"TV" side and the setting of VCR/DVD SW of the REMOTE
CONTROL UNIT is at the "VCR" side. If the switches have not
been properly set, you cannot enter the SERVICE MODE.

a) Press [SLEEP TIMER] key and, while the indication

of SLEEP TIMER 0 MIN is being displayed, press
[DISPLAY] key and [VIDEO STATUS] key on the

remote control unit (Fig.2) simultaneously.
b) The SERVICE MODE screen of Fig.1 is displayed.
c) Verify what to set in the SERVICE MODE, and set

whatever is necessary (Fig.1).

Refer to the SERVICE ADJUSTMENT for setting.
d) Press the [BACK] key twice to return normal screen.

(5) Receive channel setting

Refer to the OPERATING INSTRUCTIONS (USER'S
GUIDE) and set the receive channels (Channels Preset) as
described.

(6) User settings

Check the user setting items according to after page.
Where these do not agree, refer to the OPERATING
INSTRUCTIONS (USER'S GUIDE) and set the items as
described.

SERVICE MENU SELECT KEY

VCR/DVD
switch

TV/CATV
switch

DISPLAY

SLEEP
TIMER

MEMORY
(MUTING)

FUNCTION
(LEFT)

MENU

TV

CATV VCR DVD

SPLIT

FREEZE

INPUT 1

V1

INPUT 2

V2

INPUT 3

V3

INPUT 4

V4

DIGITAL-IN

D-IN

SLEEP TIMER

MUTING

MENU

VCR CHANNEL

PREV NEXT

REW

OPEN CLOSE

ASPECT

MULTI SCREEN

INDEX

SWAP SELECT

123

456

789

100+

0

THEATER

NATURAL

PRO

CINEMA

DISPLAY SOUND

+

CH

VOL VOL

OK

CH

VCR DVD

POWER

STOP

REC PAUSE

STILL PAUSE

RM-C13G

POWER

RETURN+

VIDEO

STATUS

LIGHT

C.C.

BACK

TV VCR

FFPLAY

TV

C.C.

POWER

NUMBER

VIDEO
STATUS

FUNCTION
(UP)

FUNCTION
(RIGHT)

BACK

FUNCTION
(DOWN)

3.2.2 SERVICE ADJUSTMENT ITEM
Setting items Settings Item No.

1. PICTURE/SOUND (sound and picture setting)

Sound circuits (A) Fixed A01~A27
Video circuits (S) Adjust S01~S99
Deflection circuits (D) Fixed D01~D32
Factory setting items (F) Adjust F01~F59

2. YC SEP (3-dimensional YC separation setting)
Adjust YCM001~YCM185

Fixed YCS001~YCS114

3. WHITE BALANCE [Can not adjust]

4. MEMORY SETUP (Memory data edit) [Do not adjust]

5. RF AFC: AFC setting (Automaticaly set) [Do not adjust]

6. DD/CM (Panel image processing setting)

Adjust DDT01~DDT34

Fixed CMT01~CMT57

7. PANEL (Panel power limit control) [Do not adjust]

Fixed PDA001~PDA012

8. PP (Multi-screen processing setting)
Adjust ADM001~ADM034

Fixed PPA001~PPA008
Fixed PPB001~PPB036
Fixed PPC001~PPC008
Fixed PPD001~PPD025

9. IP (DIST processing setting) [Do not adjust]

Fixed IPA001~IPA120
Fixed IPB001~IPB079
Fixed IPC001~IPC044
Fixed IPD001~IPD026
Fixed IPE001~IPE015

0. HDMI (Digital input process setting) [Do not adjust]

Fixed HDM001~HDM080
Fixed RHD001~RHD170

(No.YA003)1-17