JVC LT-26WX84 User manual

SERVICE MANUAL
COPYRIGHT © 2004 VICTOR COMPANY OF JAPAN, LIMITED No.YA089
2004/3
LCD FLAT TELEVISION
YA08920043
LT-26WX84 /K
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
BASIC CHASSIS
SB5
INPUT 1
INDEX
ASPECT
FREEZE SWAP SELECT
RETURN+
INPUT 2
INPUT 3
DIGITAL-IN
THEATER
PRO NATURAL CINEMA VIDEO STATUS
SLEEP TIMER DISPLAY SOUND LIGHT
TV CATV VCR DVD
MUTING
MENU BACK
C.C.
RM-C13G
REW
VCR CHANNEL
PREV NEXT VCR DVD
POWER TV VCR
FFPLAY
REC PAUSE
OPEN CLOSE STILL PAUSE
STOP
CH
CH
VOL VOL
OK
MULTI SCREEN
SPLIT
V1
V2
V3
D-IN
123
456
789
0
100+ TV
C.C.
+
POWER
INPUT 4
V4
POWER

1-2 (No.YA089)
SPECIFICATION
Design & specifications are subject to change without notice.
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
VHF Low
VHF High
UHF
CATV
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
TV / CATV Total Channel 180 Channels
Intermediate Frequency Video IF
Sound IF
45.75 MHz
41.25 MHz (4.5MHz)
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, 75Ωunbalanced, coaxial
Video / Audio input
Input-1/2/3
Component Video
[Input-1]
1125i / 750p
525p / 525i
S-Video
[Input-1/2]
Video
Audio
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
Digital-in Video
Audio
DVI-D 24-pin connector ×1
(Digital-input terminal is not compatible with computer signal)
500mV (rms), Low impedance, RCA pin jack ×2
Monitor output S-Video
Video
Audio
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 ΩRCA pin jack ×1
500mV (rms), Low impedance, RCA pin jack ×2
Headphone 3.5mm stereo mini jack ×1
Remote Control Unit RM-C13G (AA/R6/UM-3 battery ×2)

(No.YA089)1-3
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 1000Ωper 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)
PLACE THIS PROBE
ON EACH EXPOSED
METAL PART
1500 10W
0.15 F AC-TYPE
GOOD EARTH GROUND

1-4 (No.YA089)
1.2 INSTALLATION
1.2.1 HEAT DISSIPATION
If the heat dissipation vent behind this unit is blocked, cooling
efficiency may deteriorate and temperature inside the unit will
rise. The temperature sensor that protects the unit will be
activated when internal temperature exceeds the pre-determined
level and power will be turned off automatically.Therefore,
please make sure pay attention not to block the heat dissipation
vent as well as the ventilation outlet behind the unit and ensure
that there is room for ventilation around it.
1.2.2 INSTALLATION REQUIREMENTS
Ensure that the minimal distance is maintained, as specified
below, between the unit with and the surrounding walls, as well
as the floor etc.Install the unit on stable flooring or stands.Take
precautionary measures to prevent the unit from tipping in order
to protect against accidents and earthquakes.
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.
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.
Ventilation hole
150 mm
200 mm
150 mm
200 mm
50 mm
Supplied hooks (OPTION)

(No.YA089)1-5
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.
1.3.2 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.
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).

1-6 (No.YA089)
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 high-
definition 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.
Fig.1 Structure of the LCD panel unit
Top chassis
Source board
Panel ASSY
Diffuser (including board)
Upper frame
Lower frame
Lamp supporter
Diffuser supporter
Reflection plate
Inverter board
Sield case
Inverter shield cover

(No.YA089)1-7
2.2.1.2 SPECIFICATIONS
The following table shows the specifications of this unit.
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.
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/m2500cd/m2at maximum
Contrast ratio 500:1
Response time 16.7ms
View angle Vertically 170°, horizontally 170°

1-8 (No.YA089)
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

(No.YA089)1-9
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 I2C bus clock (For Main memory)
71 SDA1 I/O I2C 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 I2C bus clock (For general)
79 (AP_CLK)(LED_1) O Not used
80 SDA0 I/O I2C 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]
Pin No. Pin name I/O Function

1-10 (No.YA089)
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 I2C bus data (For Sub memory)
24 A.DIM O Not used
25 SCL1 O I2C bus clock (For Sub memory)
26 SDA0 I/O I2C bus data (For general)
27 SCL0 O I2C 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

(No.YA089)1-11
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
Pin No. Pin name I/O Function

1-12 (No.YA089)
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.
Fig.3-1-1
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.
Fig.3-1-2
JACK COVER(R)
JACK COVER(R)
STAND
STAND COVER
A
B
REAR COVER
C
E
E
D
C
CD
DC
E
E
C
C
C

(No.YA089)1-13
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.
(4) Pull out the POWER CORD.
(5) Remove 1 screw [G], and remove the POWER CORD
HOLDER.
Fig.3-1-3
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.
Fig.3-1-4
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.
(2) Remove the 3 screws [M], and remove the FRONT
CONTROL PWB.
(3) Remove the FRONT SENSOR PWB.
Fig.3-1-5
G
F
F
G
FAN BRACKET
POWER CORD
POWER CORD HOLDER
REGULATOR
PWB
COOLING
FAN
TERMINAL BASE
RECEIVER PWB
K
K
H
J
U
T
FRONT CONTROL PWB
EARTH
PLATE
FRONT SENSOR PWB
KNOB
L
M

1-14 (No.YA089)
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.
Fig.3-1-6
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.
Fig.3-1-7
Q
N
P
S
R
VIDEO PWB
JACK BASE
DIGITAL INPUT
MODULE
DIGITAL INPUT
MODULE BASE
DIGITAL INPUT
MODULE BASE
CAUTION AT DISASSEMBLY
1
3
5
2
4
6
DIGITAL INPUT MODULE
SB
connector
Prior to disassembly, unplug the power code from the AC
outlet without fail. (Turn the power "off".)
Short the SB connector [1] pin and [2] pin of the DIGITAL
INPUT MODULE. (At the time of assembling)
Before the rear panel is inserted into the cabinet, release
the short-circuit between the SB connector [1] pin and [2]
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.
VIDEO PWB BRACKET
T
T
U
MI-COM & DIST
MODULE PWB

(No.YA089)1-15
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.
Fig.3-1-8
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.
(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
Fig.3-1-9B
Q
P
Z
Z
X
YY
POWER PWB
CHASSIS BASE
AV JACK
BRACKET
SPEAKER BOX
a
a
DUCT BASE/DUCT COVER
SPEAKER(R)
SPEAKER(L)
b
c
c
b

1-16 (No.YA089)
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 PAN-
EL 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.
(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.
Fig.3-1-10A
Fig.3-1-10B
Fig.3-1-10c
d
a
e
d
d
e
LCD PANEL
Adhesive tape
Adhesive tape
X
P
Q
CENTER FRAME
f
f
FRAME(R) TOP FRAME
FRAME(L)
BOTTOM FRAME
m
h
h
g
g
j
h

(No.YA089)1-17
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
GND
GND
8V
8V
8V
8V
TRANSFORMER
OUTPUT INPUT
CONNECTOR
A
C
D
B
CONTROL PWB COVER
INVERTER PWB COVER
CONTROL PWB
FRC
LEFT
FLEXIBLE
PWB CNT1
FUSE
(F1, F2)
FUSE
(F1, F2)
FUSE
(F3, F4)
FRC
RIGHT
CNI1
CN1
CN2
INVERTER PWB
[CN4㨪CN15]
TRANSFORMER
FRONT

1-18 (No.YA089)
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.
G
G
E
F
F
I
I
I
I
I
H
SOURCE IC
GATE IC
BACKLIGHT UNIT
DIFFUSER SHEET
LCD GLASS
MAIN CHASSIS
FRONT

(No.YA089)1-19
3.2 MEMORY IC REPLACEMENT
• 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.
3.2.1 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. Receiving channel setting
Refer to the OPERATING INSTRUCTIONS and set the
receive channels (Channels Preset) as described.
5. 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.
6. SERVICE MENU setting
Verify what to set in the SERVICE MENU, and set whatever is
necessary (Fig.1). Refer to the SERVICE ADJUSTMENT for
setting.
3.2.2 SERVICE MENU SETTING ITEMS
Fig.1
Setting items Settings Item No.
1. PICTURE/SOUND (sound and picture setting)
Audio circuits (A) Fixed A01~A27
Video circuits (S) Adjust S01~S99
Drive 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
SERVICE MODE
1.PICTURE/SOUND
2.YC SEP
3.WHITE BALANCE
4.MEMORY SETUP
5.RF AFC
6.DD/CM
7.PANEL
8.PP
9.IP
0.HDMI

1-20 (No.YA089)
3.2.3 SETTINGS OF FACTORY SHIPMENT
3.2.3.1 BUTTON OPERATION 3.2.3.2 REMOTE CONTROL DIRECT OPERATION
3.2.3.3 REMOTE CONTROL MENU OPERATION
(1) PICTURE ADJUSTMENT
Customers can adjust the picture setting of menu screen as their own like but the picture standard value during factory shipment is as
below.
NTSC MODE
HD MODE
(2) SOUND ADJUST (3) CLOCK / TIMERS
(4) INITIAL SETUP
Setting item Setting position
POWER OFF
INPUT TV
CHANNEL CABLE-02
VOLUME 10
Setting item Setting position
INPUT TV
CHANNEL CABLE-02
VOLUME 10
MUTING OFF
DISPLAY OFF
SOUND A.H.S OFF
BBE ON
A.H.B ON
ASPECT NTSC, 525i,525p PANORAMA
750p,1125i FULL
OFF TIMER OFF
VIDEO STATUS DYNAMIC
NATURAL CINEMA AUTO
Setting item PICTURE BRIGHT COLOR TINT DETAIL
COLOR
TEMPERATURE
DIGI. NOISE
CLEAR
COLOR
MANAGEMENT
DINAMIC +07 +05 00 00 +04 HIGH OFF VIVID
STANDARD 00 00 00 00 00 LOW OFF STD
GAME -05 00 +05 00 -03 HIGH OFF STD
THEATER 00 00 00 00 00 HIGH OFF STD
Setting item PICTURE BRIGHT COLOR TINT DETAIL
COLOR
TEMPERATURE
DIGI. NOISE
CLEAR
COLOR
MANAGEMENT
DINAMIC +04 +06 -08 00 +02 HIGH OFF VIVID
STANDARD 00 00 00 00 00 LOW OFF STD
GAME -05 00 +05 00 00 HIGH OFF STD
THEATER 00 00 00 00 00 LOW OFF STD
Setting item Setting position
TREBLE 00
BASS 00
BALANCE 00
MTS STEREO
Setting item Setting position
SET CLOCK ---
ON / OFF TIMER NO
Setting item Setting position Setting item Setting position
POSITION ADJUSTMENT Center NOISE MUTING ON
VIDEO STATUS DYNAMIC FRONT PANEL LOCK OFF
XDS ID ON AUTO SHUT OFF OFF
POWER INDICATOR HIGH DIGITAL-IN SIZE-1
VIDEO-1 MONITOR OUT OFF V-CHIP OFF
LANGUAGE KOR AUTO DEMO OFF
CLOSED CAPTION CAPTION CC1 IMAGE SHIFT STD
TEXT T1 V1 SMART INPUT OFF