JVC LT-40X776/S User manual

SERVICE MANUAL
COPYRIGHT © 2006 Victor Company of Japan, Limited No.YA301C
2006/7
LCD FLAT TELEVISION
YA301C20067
LT-40X776/SP
HOW TO IDENTIFY MODELS
Supplementary
LT-40X776/SP is the model whose production place of P.W.B. ASS'Y was changed based on LT-40X776/S.
Therefore, this service manual describes only the items which differ from those of the LT-40X776/S service
manual.
For details other than those described in this manual, please refer to the LT-40X776/S service manuals
(No.YA301, 2005/8) (No.YA301B, 2006/2).
Distinguish name is added to the model name after at the Rating label.
SPA
DISTINGUISH NAME
MODEL NO.
VIDEO EQUIPMENT
4C43
LT-40X776
MODEL NAME
BASIC CHASSIS
FL2

1-2 (No.YA301C)
DIFFERENCE LIST
USING P.W. BOARD (Page 3-2)
EXPLODED VIEW PARTS LIST-1 (Page 3-3)
P.W.B ASS'Y Name LT-40X776/S LT-40X776/SP DESCRIPTION
DIGITAL SIGNAL PWB SFL0D134A-M2 SFL0D134A-SS Change only in PWB ASS'Y No.
Ref. No. Part No. PART NAME DESCRIPTION
LT-40X776/S LT-40X776/SP
203 SFL0D134A-M2 SFL0D134A-SS DIGITAL SIGNAL PWB

(No.YA301C)1-3
SECTION 1
PRECAUTION
Please refer to "LT-40X776/S (No.YA301)" about this section.
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
Please refer to "LT-40X776/S (No.YA301)" about this section.
SECTION 3
DISASSEMBLY
Please refer to "LT-40X776/S (No.YA301)" about this section.
SECTION 4
ADJUSTMENT
Please refer to "LT-40X776/S (No.YA301)" about this section.
SECTION 5
TROUBLESHOOTING
Please refer to "LT-40X776/S (No.YA301)" about this section.

(No.YA301C)
Display Category 12, 3-chome, Moriya-cho, Kanagawa-ku, Yokohama-city, Kanagawa-prefecture, 221-8528, Japan
Victor Company of Japan, Limited
VPT
Printed in Japan

SERVICE MANUAL
COPYRIGHT © 2006 Victor Company of Japan, Limited No.YA301B
2006/2
LCD FLAT TELEVISION
YA301B20062
LT-40X776/S
CORRECTION ITEM
PRINTED WIRING BOARD PARTS LIST
CARD P.W. BOARD ASS'Y (Page 3-12)
Supplementary
Please be informed that there are errors in the following service manuals.
LT-40X776/S (No.YA301 2005/8)
Ref. No. PART No. PART NAME DESCRIPTION
INCORRECT CORRECT
IC1501 SA16M90TFIR1D03 SA16M90TFIR1D10 IC(MICRO C ROM)
BASIC CHASSIS
FL2

(No.YA301B)
Flat Panel Display Category 12, 3-chome, Moriya-cho, Kanagawa-ku, Yokohama-city, Kanagawa-prefecture, 221-8528, Japan
Victor Company of Japan, Limited
VPT
Printed in Japan
SECTION 1
PRECAUTION
Please refer to "LT-40X776/S (No.YA301)" about this section.
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
Please refer to "LT-40X776/S (No.YA301)" about this section.
SECTION 3
DISASSEMBLY
Please refer to "LT-40X776/S (No.YA301)" about this section.
SECTION 4
ADJUSTMENT
Please refer to "LT-40X776/S (No.YA301)" about this section.
SECTION 5
TROUBLESHOOTING
Please refer to "LT-40X776/S (No.YA301)" about this section.

SERVICE MANUAL
COPYRIGHT © 2005 Victor Company of Japan, Limited No.YA301
2005/8
LCD FLAT TELEVISION
YA30120058
LT-40X776/S
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-25
BASIC CHASSIS
FL2

1-2 (No.YA301)
SPECIFICATION
Design & specifications are subject to change without notice.
Items Contents
Dimensions ( W ×H ×D ) 100.0 cm ×73.4 cm ×32.5 cm (39-3/8" ×29" ×12-7/8") [Included stand]
70.3 cm ×48.3 cm ×11.5 cm (39-3/8" ×26-1/2" ×4-1/4") [TV only]
Mass 31.5 kg (69.3 lbs) [Included stand]
24.8 kg (54.3 lbs) [TV only]
Power Input AC120 V , 60 Hz
Power Consumption 226 W (Max)
TV RF System
(Analog / Digital)
Analog
Digital
CCIR (M)
ATSC terrestrial / Digital cable
Color System (Analog) NTSC
Stereo System (Analog) BTSC (Multi Channel Sound)
Teletext System (Analog) Closed caption (T1-T4 / CC1-CC4)
TV Receiving Channels
and Frequency (Analog)
VHF Low
VHF High
UHF
CATV
02 ch - 06 ch : 54 MHz - 88 MHz
07 ch - 13 ch : 174 MHz - 216 MHz
14 ch - 69 ch : 470 MHz - 806 MHz
54 MHz - 804 MHz
Low Band : 02 - 06
High Band : 07 - 13
Mid Band : 14 - 22
Super Band : 23 - 36
Hyper Band : 37 - 64
Ultra Band : 65 - 94, 100 - 135
Sub Mid Band : 01, 96 - 99
TV / CATV Total Channel 191 Channels
Intermediate Frequency
(Analog)
Video IF
Sound IF
45.75 MHz
41.25 MHz (4.5 MHz)
Color Sub Carrier Frequency (Analog) 3.58 MHz
LCD panel 40V-inch wide aspect (16:9)
Screen Size Diagonal : 101.8 cm (H:88.5 cm ×V : 49.7 cm)
Display Pixels Horizontal : 1366 dots ×Vertical : 768 dots (W-XGA)
Audio Power Output 10 W + 10 W
Speaker 6.6 cm, round type ×4
Antenna terminal (VHF/UHF) F-type connector, 75 Ωunbalanced, 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 : 1 V (p-p) (Sync signal: 0.35V(p-p), 3-value sync.), 75 Ω
Pb/Pr : ±0.35V(p-p), 75 Ω
Y : 1 V (p-p), Positive (Negative sync provided), 75 Ω
Cb/Cr : 0.7V(p-p), 75 Ω
Mini-DIN 4 pin ×2
Y: 1 V (p-p), Positive (Negative sync provided), 75 Ω
C: 0.286V (p-p) (Burst signal), 75 Ω
1 V (p-p), Positive (Negative sync provided), 75 Ω, RCA pin jack ×3
500 mV (rms), High impedance, RCA pin jack ×6
Digital input Video
Audio
HDMI connector ×1
(Digital-input terminal is not compatible with picture signals of computer signal)
Digital: HDMI connector ×1
Anarog: 500 mV(rms) (-4 dBs), high impedance, RCA pin jack ×2
Monitor / Recording
Output
S-Video
Video
Audio
Mini-DIN 4pin ×1
Y: 1 V (p-p), 75 Ω
C: 0.286 V(p-p) (burst signal), 75 Ω
1 V (p-p), 75 Ω, RCA pin jack ×1
250 mV(rms) (-10 dBs), Fs-18 dB low impedance, RCA pin jack ×2
Audio output 500 mV (rms), Low impedance, RCA pin jack ×2
iLink Input/Output TS In/Out (4-pin, S400) ×2, IEEE1394 compliant DTCP digital copy protection compatible
Digital Audio Optical Output Digital SPDIF ×1
Headphone 3.5 mm stereo mini jack ×1
Remote Control Unit RM-C14G (AA/R6 / UM-3 battery ×2)

(No.YA301)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) 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 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.YA301)
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.
Tie commercially available tough cord(s) to the hooks in the back
of the TV, and fix the TV to solid walls or 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
Ventilation hole
*Diagram differs from actual appearance.
150mm150mm
䎕䎓䎓䏐䏐䎕䎓䎓䏐䏐
䎘䎓䏐䏐
䎘䎓䏐䏐
*Diagram differs from actual appearance.
HOOK
WALL
HOOK
It fixes in a band.
TV STAND
*Diagram differs from actual appearance.

(No.YA301)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.YA301)
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
2.1 SYSTEM SETTEING
(1) Set to 0 minutes using the [SLEEP TIMER] key.
(2) Press the [VIDEO STATUS] key and [DISPLAY] key
simultaneously, then enter the SERVICE MODE.
(3) When the Main Menu is displayed, press [2] key to enter
the self check mode.
(4) Turn off the power by pressing the [POWER] key on the
remote control unit.
2.2 FEATURES
D.I.S.T. (Digital Image Scaling Technology)
This system uses line interpolation to double the number of
scanning lines and achieve high resolution, flicker-free picture.
SMART CAPTION
Smart caption will appear when you press the MUTING button,
only on channels where the broadcast contains CLOSED
CAPTION information.
SMART SOUND
Decreases high sound levels, giving a regulated sound level.
VIDEO STATUS
Expression of a favorite screen can be chosen by the VIDEO
STATUS function.
[STANDARD ↔DYNAMIC ↔THEATER ↔GAME]
DIGITAL INPUT
Digital-in will display when any picture signal (480i/ 480p,
720p/ 1080i) in Digital-in is displayed.
V-CHIP
Since the V-CHIP is built in, it can choose, view and listen to a
healthy program.
MTS STEREO
The voice multiplex function of the MTS system is built in.
(MTS = Multi channel Television Sound system)
NATURAL CINEMA
Watching the movie or animation, press the Natural Cinema to
adjust the out line of the images to make thin more sharp.
BBE
High definition audio adds natural, clear and extraordinary
sound quality to any program.
VIDEO INPUT LABEL
This function is used to label video input connections for the
onscreen displays.
A.H.S.
Adds a more spacious surround sound. Music gives basic
effect and Movie for more effect.
Be sure to carry out the following operation at the end of
the procedure.
MAIN MENU SCREEN
SELF CHECK MODE SCREEN
LOB OK FAN OK
LOB OK FAN OK
SYNC M:OK S:OK HD:NG
SYNC M:OK S:OK HD:NG
TIM OK
TIM OK
MSM OK DIGI 0000
MSM OK DIGI 0000
MEM OK AVSW OK
MEM OK AVSW OK
YC OK AIO OK
YC OK AIO OK
TUN OK GCR NG 1
TUN OK GCR NG 1
IP OK RGB OK 8
IP OK RGB OK 8
DVI OK HDMI OK
DVI OK HDMI OK
SERVICE MENU
SERVICE MENU
1.ADJUST
1.ADJUST
2.SELF_CHECK
2.SELF_CHECK
3.I2C STOP
3.I2C STOP

(No.YA301)1-7
2.3 TECHNICAL INFORMATION
2.3.1 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.
2.3.1.1 SPECIFICATIONS
The following table shows the specifications of this unit.
2.3.1.2 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
Maximum dimensions ( W ×H ×D ) 952 mm ×551 mm ×51 mm
Weight 10.5 kg
Effective screen size Diagonal: 1018 mm (H: 885 mm ×V : 497 mm) / 40 V
Aspect ratio 16 : 9
Drive device / system a-Si-TFT, active matrix system
Resolution Horizontally 1366 ×Vertically 768 ×RGB <W-XGA> / 3147264 dots in total
Pixel pitch (pixel size) H: 0.648mm, V: 0.216mm
Displayed color 16777216 colors / 256 colors for R, G, and B
Brightness 500 cd/m2
Contrast ratio 800 : 1
Response time 8 ms
View angle Horizontally: 170°, Vertically: 170°
Surface polarizer Anti-Glare type, Low reflective coat
Color filter Vertical stripe
Backlight Cold cathode fluorescent lamp ×20
Power supply voltage in LCD 6.5 V
Power supply voltage in inverter 24 V
Panel interface system LVDS (Low Voltage Differential Signaling)

1-8 (No.YA301)
2.3.2 MAIN CPU PIN FUNCTION [IC7601 : DIGITAL SIGNAL PWB ASS'Y]
Pin Pin name I/O Function Pin Pin name I/O Function
1 VHOLD1 I Data slice for main screen closed caption 51 NC O Not used
2 HFLT1 I/O LPF for main screen closed caption video input 52 NC O Not used
3 NC O Not used 53 NC O Not used
4 NC O Not used 54 NC O Not used
5 DIGR0 O R [0] for OSD 55 NC O Not used
6 TB1in I AC power for timer clock 56 NC O Not used
7 REMO I Remote control 57 NC O Not used
8 BYTE I Data bus width select [L = 16bit (fixed)] 58 NC O Not used
9 CNVss I CPU programming mode select [Normal = L] 59 NC O Not used
10 DIGG0 O G [0] for OSD 60 NC O Not used
11 DIGB0 O B [0] for OSD 61 NC O Not used
12 RESET I Reset for main CPU [Reset = L] 62 HSYNC I H. sync for OSD
13 Xout O System clock osillation (crystal) : 16MHz 63 NC O Not used
14 Vss - GND 64 VSYNC I V. sync for OSD
15 Xin I System clock osillation (crystal) : 16MHz 65 NC O Not used
16 VccI I 3.3V stand-by power supply 66 NC O Not used
17 OSC1 I Clock for OSD 67 NC O Not used
18 OSC2 O Not used : Clock for OSD 68 NC O Not used
19 INT1 I AV COMPULINK control 69 NC O Not used
20 INT0 I
Request for sub(chassis) CPU communication (serial data) 70 NC O Not used
21 OUT1 O Ys (blanking) for OSD 71 NC O Not used
22 OUT2 O YM (transparence) for OSD 72 NC O Not used
23 NC O Not used 73 NC O Not used
24 NC O Not used 74 NC O Not used
25 NC O Not used 75 NC O Not used
26 NC O Not used 76 NC O Not used
27 CTA2/RTS2 O Not used : Digital tuner control 77 NC O Not used
28 CLK2 O Not used : Digital tuner control 78 NC O Not used
29 RxD2 I Not used : Digital tuner control 79 NC O Not used
30 TxD2 O Not used : Digital tuner control 80 NC O Not used
31 SDA2 I/O Not used 81 NC O Not used
32 DIGR1 O R [1] for OSD 82 NC O Not used
33 DIGG1 O G [1] for OSD 83 NC O Not used
34 DIGB1 O B [1] for OSD 84 WAKE O Reset for sub(chassis) CPU
35 TxD0 I Data receive (serial) for external programming 85 CARD_DET I Card detection for ATSC digital tuner
36 RxD0 O Data transmission (serial) for external programming 86
POWER_SW I Power switch (mechanical) detection
37 CLK0 I Clock for external programming 87 NC I/O Data for Inter IC (serial) bus control : memory
38 RTS0 O Busy for external programming [Operation = H] 88 NC O Clock for Inter IC (serial) bus control : memory
39 P5.7 I Not used 89 DIGR2 O R [2] for OSD
40 P5.6 O Not used 90 DIGG2 O G [2] for OSD
41 HOLD I CPU programming mode select [Normal = H] 91 DIGB2 O B [2] for OSD
42 P5.4 O Not used 92 NC O Not used
43 P5.3 O Not used 93 KEY2 I
Key scan data for front control button (MENU/CH+/CH-) KEY2
44 P5.2 O Not used 94 KEY1 I Key scan data for front control button (VOL+/VOL-) KEY1
45 P5.1 O Not used 95 VHOLD2 I Data slice for sub screen closed caption
46 WR O CPU programming mode select [Normal = L] 96 HLF2 I/O LPF for sub screen closed caption video input
47 P4.7 O
Data transmission for sub(chassis) CPU communication (serial) 97 CVIN2 I Video(Y) for sub screen closed caption
48 P4.6 I
Data receive for sub(chassis) CPU communication (serial) 98 TVSETB I Test terminal [L Fixed]
49 P4.5 I Clock for sub(chassis) CPU communication (serial) 99 VCCE I 5V stand-by power supply
50 P4.4 O Not used 100 CVIN1 I Video(Y) for main screen closed caption

(No.YA301)1-9
2.3.3 SUB (CHASSIS) CPU PIN FUNCTION [IC7001 : DIGITAL SIGNAL PWB ASS'Y]
Pin Pin name I/O Function Pin Pin name I/O Function
1 LB_PRO O Not used 51 BS_TXD O
Not used : Data transmission for digital tuner communication
2 P_MU O Picture muting [Muting = H] 52 BS_RXD I Not used : Data receive for digital tuner communication
3 JP_CSB O Not used (NC) 53 NC O Not used (NC)
4 A_MU O Audio muting [Muting = H] 54 VREF+ I 3.3V power supply
5 M_MU O Audio muting (for AUDIO OUT) [Muting = H] 55 PDP_TX O
Data transmission for SUB (DRIVE) CPU communication
6 PC_SEL O Not used : RGB(PC) INPUT select 56 PDP_RX I Data receive for SUB (DRIVE) CPU communication
7 ON_TIMER O POWER INDICATOR (LED) brightness [LOW = L] 57 SDA0 I/O Data for Inter IC (serial) bus : EEP-ROM (IC7002)
8 ILA0 O LCD back light lighting 58 SCL0 O Clock for Inter IC (serial) bus : EEP-ROM (IC7002)
9 ILA1 O LCD panel overshoot refresh timing 59 SDA_DVI I/O
Not used : Data for Inter IC (serial) bus for panel communication
10 ILA2 O Not used 60 SCL_DVI O Not used : Clock for Inter IC (serial) bus for panel communication
11 POW_LED O POWER LED lighting [ON = H] 61 AVSS - GND
12 WORD O Not used 62 DIGII_PHOT I Photo sensor for DIGITAL-IN illegal copy protection
13 MI_CK I Clock for SUB (OSD) CPU communication 63 AGC I Not used
14 MI_TX I Data receive for SUB (OSD) CPU communication 64 EXT_YS1 I Not used
15 MI_RX O Data transmission for SUB (OSD) CPU communication 65 EXT_YS2 I Not used
16 MI_REQ O
Data request for SUB (OSD) CPU communication [Request = L] 66 VDD I 3.3V power supply
17 VDD I 3.3V power supply 67 DIGI_PRO O for DIGITAL-IN (HDMI)
18 FOSC O Not used (NC) 68 GCR_RST O Not used (NC)
19 VSS - GND 69 GR_ON O Not used (NC)
20 X1 I Not used : Low speed oscillatior 70 SYNC_SEL O Not used : Sync select for digital tuner
21 X0 O Not used : Low speed oscillatior 71 NC O Not used (NC)
22 VDD I 3.3V power supply 72 NC O Not used (NC)
23 OSC1 I System clock osillation (crystal) : 16MHz 73 SBD5 I/O
Data for writing on board (connect CN01P : for Frash ROM type)
24 OSC0 O System clock osillation (crystal) : 16MHz 74 SBT5 I Clock for writing on board (connect CN01P : for Frash ROM type)
25 MODE I Single chip mode 75 NMI I 3.3V power supply
26 BS1.5CTL O Not used : Digital tuner power / reset control 76 COMP I AV COMPULINK lll control
27 A92RES O
Reset for IC1001(3D YC SEP / COLOR DEMODULAT) [Reset = H] 77 REMO I Remote control
28 BS_RST O Not used: Reset for Digital tuner power / reset control 78 VSYNC I V. sync pulse
29 LIP_RST O Not used: Reset for Sound delay (Lip sync) 79 WAKE I Reset for sub(chassis) CPU
30 SOFT_OFF O Not used 80
POWERGOOD I Power error detection [NG = H]
31 VMUTE I No use : Picture muting request from digital tuner 81 NC O Not used (NC)
32 VOUTENB O No use : Video cutoff for digital tuner 82 RST I Reset for MAIN CPU [Reset = L]
33 MDR_CON I No use : System cable connection monitor for PDP 83 VDD I 3.3V power supply
34 AVDD I 3.3V power supply 84 SCL3A O Clock for Inter IC (serial) bus control
35 BS_POW O Not used : Digital tuner power control 85 SDA3A I/O Data for Inter IC (serial) bus control
36
DsyncSW2 O Sync select for DIGITAL-IN [Cotrolled with 99-pin] 86 SCL3B O Clock for Inter IC (serial) bus control
37 LB_POW O Not used : Power control for low bias line 87 SDA3B I/O Data for Inter IC (serial) bus control
38 NC O Not used (NC) 88
DIGI_SYNCSEL O Not used
39 HOTPLUG I
Not used : Video communiation monitor for receiver unit (PDP) 89 DIGI_LRSW O For DIGITAL-IN (HDMI)
40 MECA_SW I Mechanical monitor for POWER switch [Push = L] 90 DIGI_INT I Reset for HDMI process [Reset = ]
41 MAIN_POW O Main power control [ON = L] 91 DVI_RST O Not used : Reset for DVI format conversion
42 MSP_RST O AUDIO OUT output mode select [VARIABLE = L] 92 VSS - GND
43 VREF- I Not used 93 SCL5055 O
Clock for Inter IC (serial) bus : JCC5055 (DIST process)
44 AFT2 I Not used : AFT voltage for sub tuner 94 VFORMATSEL O Not used : Digital tuner clock control
45 AFT1 I AFT voltage for VHF/UHF tuner 95 SDA5055 I/O Data for Inter IC (serial) bus : JCC5055 (DIST process)
46 KEY2 I Key scan data for front switch (MENU/CH+/CH-) 96
OSD_MODE_SEL O Not used : OSD mode select
47 KEY1 I Key scan data for front switch (VOL+/VOL-) 97 NC O Not used (NC)
48 NC O Not used (NC) 98 15K/OTH O Main video select [Fixed H]
49 NC O Not used (NC) 99 DsyncSW1 O Sync select for DIGITAL-IN [Cotrolled with 36-pin]
50 AC_IN I AC power pulse for timer clock 100 57 BUSY I Busy monitor for JCC5057 (New DIST process)

1-10 (No.YA301)
SECTION 3
DISASSEMBLY
3.1 CAUTION AT DISASSEMBLY
•Be sure to perform the SYSTEM SETTING at the end of the procedure.
• Make sure that the power cord is disconnected from the outlet.
• Pay special attention not to break or damage the parts.
• When removing each board, remove the connectors as required. Taking notes of the connecting points (connector numbers) makes
service procedure manageable.
• Make sure that there is no bent or stain on the connectors before inserting, and firmly insert the connectors.
3.2 DISASSEMBLY PROCEDURE
3.2.1 REMOVING THE STAND (Fig.1)
(1) Remove the 1 screw [A], then remove the STAND COVER.
(2) Remove the 4 screws [B], then remove the STAND.
3.2.2 REMOVING THE REAR COVER (Fig.1)
• Remove the STAND.
(1) Remove the JACK COVER (L/R).
(2) Remove the 10 screws [C], the 3 screws [D], and the 2
screws [E].
(3) Remove the REAR COVER.
3.2.3 REMOVING THE REGULATOR PWB (Fig.1)
• Remove the STAND.
• Remove the REAR COVER.
(1) Remove the 4 screws [F], then remove the FAN
BRACKET.
(2) Remove the 1 screw [G], then remove the POWER CORD
HOLDER.
(3) Remove the POWER CORD from the POWER PWB.
(4) Remove the REGULATOR PWB.
3.2.4 REMOVING THE MAIN POWER PWB (Fig.1)
• Remove the STAND.
• Remove the REAR COVER.
• Remove the FAN BRACKET.
(1) Remove the 4 screw [H], then remove the MAIN POWER
PWB.
3.2.5 REMOVING THE ANALOG SYGNAL PWB (Fig.1)
• Remove the STAND.
• Remove the REAR COVER.
• Remove the FAN BRACKET.
(1) Remove the 6 screws [J], then remove the TERMINAL BASE.
(2) Remove the 5 screws [K], then remove the ANALOG
SIGNAL PWB.
3.2.6 REMOVING THE FRONT CONTROL PWB (Fig.1)
• Remove the STAND.
• Remove the REAR COVER.
(1) Remove the 3 screws [L], then remove the CONTROL
ASSY with the FRONT CONTROL PWB.
(2) Remove the FRONT CONTROL PWB.
3.2.7 REMOVING THE RECEIVER PWB (Fig.1)
• Remove the STAND.
• Remove the REAR COVER.
(1) Remove the 3 screws [M] and the 1 screw [N], then
remove the TUNER BASE.
(2) Remove the 2 screws [P] and the 2 screws [Q], then
remove the TOP SHIELD CASE.
(3) Remove the 2 screws [R], then remove the RECEIVER PWB.
3.2.8 REMOVING THE CONNECTOR PWB (Fig.1)
• Remove the STAND.
• Remove the REAR COVER.
• Remove the TOP SHIELD CASE.
(1) Remove the 4 screws [S], then remove the RECEIVER
PWB BRACKET.
(2) Remove the 1 screw [T], then remove the CONNECTOR PWB.
3.2.9 REMOVING THE COOLING FAN (Fig.1)
• Remove the STAND.
• Remove the REAR COVER.
• Remove the TOP SHIELD CASE.
(1) Remove the 5 screws [U] and the 3 screws [V], then
remove the SHIELD COVER with COOLING FAN.
(2) Remove the 2 ribets [W], then the remove the COOLING FAN.
3.2.10 REMOVING THE ATSC TUNER MODULE PWB (Fig.1)
• Remove the STAND.
• Remove the REAR COVER.
• Remove the TUNER BASE.
• Remove the TOP SHIELD CASE.
• Remove the SHIELD COVER.
(1) Remove the 5 screws [X], then remove the DIGITAL
TUNER UNIT.
3.2.11 REMOVING THE DIGITAL SIGNAL PWB (Fig.1)
• Remove the STAND.
• Remove the REAR COVER.
• Remove the TUNER BASE.
• Remove the TOP SHIELD CASE.
• Remove the SHIELD COVER.
• Remove the ATSC TUNER MODULE PWB.
(1) Remove the 3 screws [Y], then remove the DIGITAL
BRACKET.
(2) Remove the DIGITAL SIGNALPWB.
3.2.12 REMOVING THE SD CARD PWB (Fig.1)
• Remove the STAND.
• Remove the REAR COVER.
(1) Remove the 2 screws [Z], then remove the SD CARD PWB.
3.2.13 REMOVING THE SUB POWER PWB (Fig.1)
• Remove the STAND.
• Remove the REAR COVER.
• Remove the FAN BRACKET.
(1) Remove the 2 screws [A'], then remove the SUB POWER
PWB BRACKET with SUB POWER PWB.
(2) Remove the 3 screws [B'], then remove the SUB POWER
PWB.

(No.YA301)1-11
Fig.1
FAN BRACKET
TOP SHIELD CASE
SIDE SHIELD CASE
DIGITAL
BRACKET
SHIELD
COVER
INSULATOR
FRONT
RECEIVER PWB
BRACKET
SUB POWER PWB BRACKET
B
A
B
C
D
E
M
N
V
P
U
Q
W
X
Y
F
F
R
S
Z
B'
A'
T
L
L
J
G
H
STAND
STAND COVER
JACK COVER
JACK COVER
TUNER BASE
COOLING FAN
ATSC TUNER
MODULE PWB
DIGITAL SIGNAL PWB
SUB POWER PWB
SD CARD PWB
CONNECTOR PWB
POWER CORD
HOLDER
ANALOG SIGNAL PWB
TERMINAL BASE
FRONT
CONTROL PWB
CONTROL ASSY
POWER CORD
MAIN POWER PWB
REAR COVER
REGULATOR PWB
RECEIVER PWB
K

1-12 (No.YA301)
3.2.14 REMOVING THE SPEAKER (Fig.2)
• Remove the STAND.
• Remove the REAR COVER.
(1) Remove the 6 screws [A], then remove the SPEAKER (L /R).
NOTE:
• Since the speaker is attached in a certain direction, attach
the speaker in the same correct direction as it has been
attached.
• When the speaker is decomposed, the performance cannot
be kept.
3.2.15 REMOVING THE FRONT LED PWB (Fig.2)
• Remove the STAND.
• Remove the REAR COVER.
• Remove the FAN BRACKET.
• Remove the SUB POWER PWB BRACKET.
(1) Remove the 2 screws [B], then remove the FRONT LED
PWB.
3.2.16 REMOVING THE LED LENS (Fig.2)
• Remove the STAND.
• Remove the REAR COVER.
• Remove the FAN BRACKET.
• Remove the SUB POWER PWB BRACKET.
• Remove the FRONT LED PWB.
(1) Remove the 2 screws [M], then remove the LED LENS.
3.2.17 REMOVING THE CARD PWB (Fig.2)
• Remove the STAND.
• Remove the REAR COVER.
(1) Remove the 2 screws [C], then remove the CARD BASE.
(2) Remove the 1 screw [D], then remove the CARD PWB
BRACKET with CARD PWB.
(3) Remove the 4 screws [E], then remove the CARD PWB.
3.2.18 REMOVING THE LCD PANEL UNIT (Fig.2)
• Remove the STAND.
• Remove the REAR COVER.
• Remove the FAN BRACKET.
• Remove the CARD PWB BRACKET.
(1) Remove the 2 screws [F], then remove the MAIN BASE.
(2) Remove the 4 screws [G] and the 2 screw [H], then remove
the TOP FRAME.
(3) Remove the 2 screws [J] and the 2 screws [K], then
remove the BOTTOM FRAME.
(4) Remove the 2 screws [L], then remove the SUB
BRACKET.
(5) Remove the LCD PANEL UNIT from the FRONT PANEL.

(No.YA301)1-13
Fig.2
BOTTOM FRAME
CARD PWB BRACKET
CARD PWB SHIELD
SUB BRACKET
SUB BRACKET
TOP FRAME
MAIN BASE
FRONT
F
G
L
L
H
D
A
E
C
A
B
J
K
SPEAKER
SPEAKER
FRONT LED PWB
CARD PWB
CARD BASE
FRONT PANEL

1-14 (No.YA301)
3.3 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.
3.3.1 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 MODE setting
Verify what to set in the SERVICE MODE, and set whatever is necessary (Fig.1). Refer to the SERVICE ADJUSTMENT for setting.
3.3.2 SERVICE MODE SETTING
SERVICE MODE SCREEN
Fig.1
SETTING ITEM
MAIN MENU SCREEN
ADJUSTMENT MODE SCREEN
S001 PREPARE 000
S001 PREPARE 000
NTSC3 1409 DYN H
NTSC3 1409 DYN H
SERVICE MENU
SERVICE MENU
1.ADJUST
1.ADJUST
2.SELF_CHECK
2.SELF_CHECK
3.I2C STOP
3.I2C STOP
Setting items Settings Item No.
Video sytetem setting Adjust S001 to S039
Audio sytetem setting Adjust T001 to T010
Panel control sytetem setting Fixed P001 to P010
Drive sytetem setting Fixed D001 to D187
Main cpu system setting Fixed Z001 to Z010