JVC LT-19DA9BJ User manual

SERVICE MANUAL
COPYRIGHT © 2009 Victor Company of Japan, Limited No.YA683<Rev.001>
2009/3
INTEGRATED DIGITAL TERRESTRIAL LCD TELEVISION
YA683<Rev.001>20093SERVICE MANUAL
LT-19DA1BJ/AK, LT-19DA1BU/AK
COPYRIGHT © 2009 Victor Company of Japan, Limited
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16

1-2 (No.YA683<Rev.001>)
SPECIFICATION
Design & specifications are subject to change without notice.
Items Contents
LT-19DA1BJ LT-19DA1BU
Dimensions ( W ×H ×D ) 38.46 cm ×47.5 cm ×19.0 cm (With stand)]
34.53 cm ×47.5 cm ×9.45 cm (Without stand)]
Mass 4.4 kg (With stand)
4.1 kg (Without stand)
Power Input AC220V - AC240 V, 50 Hz
Power Consumption 68 W
TV RF System Analog CCIR (I) CCIR (B/G, I, D/K, L)
Digital DVB-T
Colour System PAL, SECAM, NTSC 3.58/4.43 [EXT only]
Stereo System NICAM (I) NICAM (B/G, I, D/K, L), A2 (B/G, D/K)
Receiving
Frequency
Analog UHF: 470 MHz - 855.25 MHz VHF: 46.25 MHz - 470MHz
UHF: 470 MHz - 855.25 MHz
CATV: 116MHz - 172MHz / 220MHz - 469MHz
Digital UHF:474 MHz - 858 MHz
Intermediate
Frequency
VIF 38.9MHz 38.9MHz (B/G, I, D/K, L)
SIF 32.9MHz (6.0MHz) 33.4MHz (5.5MHz:B/G)
32.9MHz (6.0MHz:I)
32.4MHz (6.5MHz:D/K)
Colour Sub
Carrier
Frequency
PAL 4.43MHz
SECAM - 4.40625MHz / 4.25MHz
NTSC 3.58MHz / 4.43MHz
Teletext
System
Analog FLOF (Fastext), TOP
Digital MHEG 5 UK profile EBU TEXT
LCD panel 19-inch wide aspect (16 : 10)
Screen Size Diagonal : 48.0 cm (H: 40.8 cm ×V: 25.5 cm)
Display Pixels Horizontal : 1440 dots ×Vertical : 900 dots
Audio Power Output 1 W + 1 W
Speaker 3.0 cm ×11.0 cm, oval type ×2
Aerial terminal (VHF/UHF) 75 Ωunbalanced, coaxial ×1
EXT-1
(Input)
S-Video Mini-DIN 4 pin ×1
Y: 1 V (p-p), Positive (Negative sync provided), 75 Ω
C: 0.286 V (p-p) (Burst signal), 75 Ω
Video 1V (p-p), Positive (Negative sync provided), 75 Ω, RCA pin jack ×1
Audio 500 mV (rms), High impedance, RCA pin jack ×2
EXT-2 (Input/Output) 21-pin Euro connector (SCART socket ) ×1
EXT-3
(Input)
Component Video
750p / 1125i
625p / 525p / 625i / 525i
RCA pin jack ×3
Y: 1 V (p-p) (Sync signal: ±0.35V(p-p), 3-value sync.), 75Ω/ Pb/Pr: ±0.35V(p-p), 75 Ω
Y: 1 V (p-p), Positive (Negative sync.), 75 Ω/ Cb/Cr: 0.7V(p-p), 75 Ω
Audio 500 mV(rms) (-4dBs), high impedance, RCA pin jack ×2
EXT-4
(Digital Input)
Video / Audio HDMI 2-row 19pin connector ×1
(Digital-input terminal is not compatible with picture signals of personal computer)
576i(625i),576p(625p),480i(525i),480p(525p),720p(750p),1080i(1125i) signals are available.
EXT-5
(PC Input)
Video D-sub 15 pin ×1
R/G/B : 0.7 V (p-p), 75Ω
HD / VD : 1 V (p-p) to 5 V (p-p), high impedance
< Available signal >
VGA : 640 pixels ×480 pixels (Horizontal : 31.5 kHz / Vertical : 60 Hz)
SVGA : 800 pixels ×600 pixels (Horizontal : 37.9 kHz / Vertical : 60 Hz)
XGA : 1024 pixels ×768 pixels (Horizontal : 48.4 kHz / Vertical : 60 Hz)
WXGA : 1360 pixels ×768 pixels (Horizontal : 47.8 kHz / Vertical : 60 Hz)
Headphone 3.5 mm stereo mini jack ×1
Remote Control Unit RM-C1893B (AA/R6 dry cell battery ×2)

(No.YA683<Rev.001>)1-3
SECTION 1
PRECAUTION
1.1 SAFETY PRECAUTIONS [EXCEPT FOR UK]
(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 isola-
tion check on the exposed metal parts of the cabinet (an-
tenna 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 appli-
ance rated up to 120V, and 3000V AC (r.m.s.) to an appli-
ance 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 leak-
age 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
0.7mA AC (r.m.s.).
However, in tropical area, this must not exceed 0.35V
AC (r.m.s.). This corresponds to 0.3mA 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.YA683<Rev.001>)
1.2 SAFETY PRECAUTIONS [FOR UK]
(1) The design of this product contains special hardware and many circuits and components specially for safety purposes. For
continued protection, no changes should be made to the original design unless authorized in writing by the manufacturer.
Replacement parts must be identical to those used in the original circuits. Service should be performed by qualified personnel
only.
(2) Alterations of the design or circuitry of the product should not be made. Any design alterations or additions will void the
manufacturer's warranty and will further relieve the manufacturer of responsibility for personal injury or property damage
resulting therefrom.
(3) Many electrical and mechanical parts in the product have special safety-related characteristics. These characteristics are often
not evident from visual inspection nor can the protection afforded by them necessary be obtained by using replacement
components rated for higher voltage, wattage, etc. Replacement parts which have these special safety characteristics are
identified in the Parts List of Service Manual. Electrical components having such features are identified by shading on the
schematics and by ( ) on the Parts List in the Service Manual. The use of a substitute replacement which does not have the
same safety characteristics as the recommended replacement part shown in the Parts List of Service Manual may cause shock,
fire, or other hazards.
(4) The leads in the products are routed and dressed with ties, clamps, tubing’s, barriers and the like to be separated from live parts,
high temperature parts, moving parts and / or sharp edges for the prevention of electric shock and fire hazard. When service is
required, the original lead routing and dress should be observed, and it should be confirmed that they have been returned to
normal, after re-assembling.
WARNING
(1) The equipment has been designed and manufactured to meet international safety standards.
(2) It is the legal responsibility of the repairer to ensure that these safety standards are maintained.
(3) Repairs must be made in accordance with the relevant safety standards.
(4) It is essential that safety critical components are replaced by approved parts.
(5) If mains voltage selector is provided, check setting for local voltage.
1.3 INSTALLATION
1.3.1 ATTACH THE STAND TO THE TV
When installing the unit on the floor, it is required to attach the
supplied stand.
To attach the stand to the TV, follow the procedure below.
(1) Spread a thick and soft cloth over a table. Place the main
unit face down onto it.
(2) Insert the stand to the main unit slowly.
1.3.2 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.
*The drawing may differ from the actual appearance.
Ventilation hole

(No.YA683<Rev.001>)1-5
1.3.3 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.
1.3.4 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.
1.3.5 NOTES ON HANDLING
When taking the unit out of a packing case, do not grasp the
upper part of the unit. If you take the unit out while grasping the
upper part, the LCD PANEL may be damaged because of a
pressure. Instead of grasping the upper part, put your hands on
the lower backside or sides of the unit.
1.4 HANDLING LCD PANEL
1.4.1 PRECAUTIONS FOR TRANSPORTATION
When transporting the unit, pressure exerted on the internal LCD
panel due to improper handling (such as tossing and dropping)
may cause damages even when the unit is carefully packed. To
prevent accidents from occurring during transportation, pay
careful attention before delivery, such as through explaining the
handling instructions to transporters.
Ensure that the following requirements are met during
transportation, as the LCD panel of this unit is made of glass and
therefore fragile:
(1) USE A SPECIAL PACKING CASE FOR THE LCD PANEL
When transporting the LCD panel of the unit, use a special
packing case (packing materials). A special packing case
is used when a LCD panel is supplied as a service spare
part.
(2) ATTACH PROTECTION SHEET TO THE FRONT
Since the front (display part) of the panel is vulnerable,
attach the protection sheet to the front of the LCD panel
before transportation. Protection sheet is used when a LCD
panel is supplied as a service spare part.
(3) AVOID VIBRATIONS AND IMPACTS
The unit may be broken if it is toppled sideways even when
properly packed. Continuous vibration may shift the gap of
the panel, and the unit may not be able to display images
properly. Ensure that the unit is carried by at least 2
persons and pay careful attention not to exert any vibration
or impact on it.
(4) DO NOT PLACE EQUIPMENT HORIZONTALLY
Ensure that it is placed upright and not horizontally during
transportation and storage as the LCD panel is very
vulnerable to lateral impacts and may break. During
transportation, ensure that the unit is loaded along the
traveling direction of the vehicle, and avoid stacking them
on one another. For storage, ensure that they are stacked
in 2 layers or less even when placed upright.
1.4.2 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.
1.4.3 PRECAUTIONS FOR REPLACEMENT OF EXTERIOR
PARTS
Take note of the following when replacing exterior parts (REAR
COVER, FRONT PANEL, etc.):
(1) Do not exert pressure on the front of the LCD panel (filter
surface). It may cause irregular 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).
*The drawing may differ from the actual appearance.
150 mm
200 mm
50 mm
150 mm
200 mm
It fixes in a band.
TV STAND
*The drawing may differ from the actual appearance.

1-6 (No.YA683<Rev.001>)
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
2.1 FEATURES
DIGITAL TUNER
This TV can receive both DVB-T (Digital terrestrial broadcasting),
DVB-S(Digital satellite broadcasting: DB9 only) and Analogue
terrestrial broadcasting.
HDMI INPUT
By connecting a HDMI compatible device, high definition
pictures can be displayed on your TV in their digital form.
PICTURE MODE
This function can adjust the picture settings automatically.
There are Standard, Dynamic, Movie and News in the
PICTURE MODE.
ZOOM
This function can change the screen size according to the
picture aspect ratio.
2.2 MAIN DIFFERENCE LIST
Items Contents
LT-19DA9BJ LT-19DA9BU
Teletext System (Digital) MHEG 5 UK profile EBU TEXT
POWER CORD UK TYPE (3-pins) EU TYPE (2-pins)
MAIN PWB FU-1ESA19688-1 FU-1ESA19148-1
FUNCTION PWB FU-1ESA19688-2 FU-1ESA19148-2
IR SENSOR PWB FU-1ESA19688-1 FU-1ESA19148-3
JACK PWB FU-1ESA19688-4 FU-1ESA19148-4
INVERTER PWB FU-1ESA19502-1 FU-1ESA19502-1
JUNCTION PWB FU-1ESA19502-2 FU-1ESA19502-2
DIGITAL MAIN UNIT FU-1ESA19709 FU-1ESA19153

(No.YA683<Rev.001>)1-7
2.3 STANDARD NOTES FOR SERVICING
2.3.1 CIRCUIT BOARD INDICATIONS
(1) The output pin of the 3 pin Regulator ICs is indicated as
shown.
(2) For other ICs, pin 1 and every fifth pin are indicated as
shown.
(3) The 1st pin of every male connector is indicated as shown.
2.3.2 INSTRUCTIONS FOR CONNECTORS
(1) When you connect or disconnect the FFC (Flexible Foil
Connector) cable, be sure to first disconnect the AC cord.
(2) FFC (Flexible Foil Connector) cable should be inserted
parallel into the connector, not at an angle.
2.3.3 PB (LEAD) FREE SOLDER
Pb free mark will be found on PCBs which use Pb free
solder. (Refer to figure.) For PCBs with Pb free mark, be sure
to use Pb free solder. For PCBs without Pb free mark, use
standard solder.
2.3.4 HOW TO REMOVE / INSTALL FLAT PACK-IC
2.3.4.1 REMOVAL
WITH HOT-AIR FLAT PACK-IC DESOLDERING MACHINE:
(1) Prepare the hot-air flat pack-IC desoldering machine,
then apply hot air to the Flat Pack-IC (about 5 to 6
seconds). (Fig.2-1)
Fig.2-1
(2) Remove the flat pack-IC with tweezers while applying
the hot air.
(3) Bottom of the flat pack-IC is fixed with glue to the PWB;
when removing entire flat pack-IC, first apply soldering
iron to center of the flat pack-IC and heat up. Then
remove (glue will be melted). (Fig.2-6)
(4) Release the flat pack-IC from the PWB using tweezers.
(Fig.2-6)
CAUTION:
(1) The Flat Pack-IC shape may differ by models. Use an
appropriate hot-air flat pack-IC desoldering machine,
whose shape matches that of the Flat Pack-IC.
(2) Do not supply hot air to the chip parts around the flat
pack-IC for over 6 seconds because damage to the
chip parts may occur. Put masking tape around the flat
pack-IC to protect other parts from damage. (Fig.2-2)
(3) The flat pack-IC on the PWB is affixed with glue, so be
careful not to break or damage the foil of each pin or
the solder lands under the IC when removing it.
Fig.2-2
Top View
Out In
Bottom View
Input
5
10
Pin 1
Pin 1
FFC Cable
Connector
CBA
* Be careful to avoid a short circuit.
Pb free mark
Hot-air
Flat Pack-IC
Desoldering
Machine
CBA
Flat Pack-IC
Tweezers
Masking
Tape

1-8 (No.YA683<Rev.001>)
WITH SOLDERING IRON:
(1) Using desoldering braid, remove the solder from all pins
of the flat pack-IC. When you use solder flux which is
applied to all pins of the flat pack-IC, you can remove it
easily. (Fig.2-3)
Fig.2-3
(2) Lift each lead of the flat pack-IC upward one by one,
using a sharp pin or wire to which solder will not adhere
(iron wire). When heating the pins, use a fine tip
soldering iron or a hot air desoldering machine. (Fig.2-4)
Fig.2-4
(3) Bottom of the flat pack-IC is fixed with glue to the PWB;
when removing entire flat pack-IC, first apply soldering
iron to center of the flat pack-IC and heat up. Then
remove (glue will be melted). (Fig.2-6)
(4) Release the flat pack-IC from the PWB using tweezers.
(Fig.2-6)
WITH IRON WIRE:
(1) Using desoldering braid, remove the solder from all pins
of the flat pack-IC. When you use solder flux which is
applied to all pins of the flat pack-IC, you can remove it
easily. (Fig.2-3)
(2) Affix the wire to a workbench or solid mounting point, as
shown in Fig.2-5.
(3) While heating the pins using a fine tip soldering iron or
hot air blower, pull up the wire as the solder melts so as
to lift the IC leads from the PWB contact pads as shown
in Fig.2-5.
(4) Bottom of the flat pack-IC is fixed with glue to the PWB;
when removing entire flat pack-IC, first apply soldering
iron to center of the flat pack-IC and heat up. Then
remove (glue will be melted). (Fig.2-6)
(5) Release the flat pack-IC from the PWB using tweezers.
(Fig.2-6)
NOTE:
When using a soldering iron, care must be taken to ensure
that the flat pack-IC is not being held by glue. When the flat
pack-IC is removed from the PWB, handle it gently because
it may be damaged if force is applied.
Fig.2-5
Fig.2-6
Flat Pack-IC Desoldering Braid
Soldering Iron
Fine Tip
Soldering Iron
Sharp
Pin
To Solid
Mounting Point
Soldering Iron
Iron Wire
or
Hot Air Blower
Fine Tip
Soldering Iron
CBA
Flat Pack-IC
Tweezers

(No.YA683<Rev.001>)1-9
2.3.4.2 INSTALLATION
(1) Using desoldering braid, remove the solder from the foil of
each pin of the flat pack-IC on the PWB so you can install
a replacement flat pack-IC more easily.
(2) The zmark on the flat pack-IC indicates pin 1. (See Fig.2-
7.) Be sure this mark matches the 1 on the PCB when
positioning for installation. Then presolder the four corners
of the flat pack-IC. (See Fig.2-8.)
(3) Solder all pins of the flat pack-IC. Be sure that none of the
pins have solder bridges.
Fig.2-7
Fig.2-8
2.3.5 INSTRUCTIONS FOR HANDLING SEMI-
CONDUCTORS
Electrostatic breakdown of the semi-conductors may occur due
to a potential difference caused by electrostatic charge during
unpacking or repair work.
2.3.5.1 GROUND FOR HUMAN BODY
Be sure to wear a grounding band (1MΩ) that is properly
grounded to remove any static electricity that may be charged on
the body.
2.3.5.2 GROUND FOR WORKBENCH
Be sure to place a conductive sheet or copper plate with proper
grounding (1MΩ) on the workbench or other surface, where the
semi-conductors are to be placed. Because the static electricity
charge on clothing will not escape through the body grounding
band, be careful to avoid contacting semi-conductors with your
clothing.
Example :
Pin 1 of the Flat Pack-IC
is indicated by a " " mark.
Presolder
CBA
Flat Pack-IC
<I n c o rr ec t >
CBA
Grounding Band
Conductive Sheet or
Copper Plate
1M
1M
< C o rr ec t >
CBA

1-10 (No.YA683<Rev.001>)
SECTION 3
DISASSEMBLY
3.1 DISASSEMBLY FLOWCHART
This flowchart indicates the disassembly steps for the cabinet
parts, and the CBA in order to gain access to item(s) to be ser-
viced. When reassembling, follow the steps in reverse order.
Bend, route and dress the cables as they were.
3.2 DISASSEMBLY METHOD
Note:
(1) Order of steps in procedure. When reassembling, follow
the steps in reverse order. These numbers are also used
as the Identification (location) No. of parts in figures.
(2) Parts to be removed or installed.
(3) Fig. No. showing procedure of part location
(4) Identification of parts to be removed, unhooked,
unlocked, released, unplugged, unclamped, or
desoldered.
P = Spring, L = Locking Tab, S = Screw, CN = Connector
* = Unhook, Unlock, Release, Unplug, or Desolder
e.g. 2(S-2) = two Screws (S-2), 2(L-2) = two Locking
Tabs (L-2)
(5) Refer to the following "Reference Notes in the Table."
[7] Digital Main
Unit
[5] Jack PWB
[12] IR Sensor PWB
[1] Stand Cover
[2] Stand Neck
[4] Rear Cabinet
[13] Function PWB
[15] Speaker(s)
[3] Stand Hinge
[6] Shield Box
[16] Front Cabinet
[9] Main PWB
[8] Shield(T)
[11] Inverter PWB
[10] Junction PWB
[14] LCD Module
Assembly
Step/
Loc.
No.
Part
Removal
Fig.
No.
Remove/*Unhook/
Unlock/Release/
Unplug/Unclamp/
Desolder
Note
[1] Stand
Cover D1 2(S-1) ---
[2] Stand Neck D1 2(S-2) ---
[3] Stand
Hinge D1 --------------- ---
[4] Rear
Cabinet D1 2(S-3), 7(S-4), *7(L-1) ---
[5] Jack PWB D2
D3 2(S-5), *CN107 ---
[6] Shield Box D2
D3
2(S-6), (S-7), 5(S-8),
6(S-9), *CN101A,
*CN102A, *CN103A,
*CN104A, *CN4501,
*CN4502, FFC Shield
---
[7] Digital Main
Unit
D2
D3
2(S-10), Connector IC
Card OSU ---
[8] Shield(T) D2 (S-11a), 2(S-11b) ---
[9] Main PWB D2
D3
6(S-12), *CN106,
*CN105A, *CN802 ---
[10] Junction
PWB
D2
D3 *CN403A ---
[11] Inverter
PWB
D2
D3
4(S-13), *CN401,
*CN402, *CN451 ---
[12] IR Sensor
PWB
D2
D3 *CN301 ---
[13] Function
PWB
D2
D3 --------------- ---
[14]
LCD
Module
Assembly
D2 --------------- ---
[15] Speaker(s) D2 4(S-14) ---
[16] Front
Cabinet D2 --------------- ---
(1) (2) (3) (4) (5)

(No.YA683<Rev.001>)1-11
[4] Rear Cabinet
(S-4)
(S-4)
(S-1)
(S-2)
(S-3)
(S-4)
[1] Stand Cover
[2] Stand Neck
[3] Stand Hinge
(S-4)
(L-1)
(L-1)
(S-4)
(L-1)
(L-1)
(L-1)
Fig. D1

1-12 (No.YA683<Rev.001>)
[5] Jack PWB
(S-14)
(S-14)
(S-9) (S-10)
[12] IR Sensor
PWB
[6] Shield Box
[10] Junction PWB
[11] Inverter PWB
[16] Front Cabinet
[9] Main PWB
[8] Shield(T)
[13] Function
PWB
[15] Speaker
(S-9)
(S-5)
(S-5)
(S-6)
(S-12)
(S-11b)
(S-11b)
(S-11a)
(S-12)
[7] Digital Main
Unit
[14] LCD Module
Assembly
(S-13)
(S-13)
(S-7) (S-8)
(S-8)
(S-8)
(S-12)
[15] Speaker
Connector IC
Card OSU
FFC Shield
Fig. D2

(No.YA683<Rev.001>)1-13
SECTION 4
ADJUSTMENT
4.1 GENERAL NOTE: “PWB” IS ABBREVIATION FOR
“CIRCUIT BOARD ASSEMBLY.”
NOTE:
Electrical adjustments are required after replacing circuit
components and certain mechanical parts. It is important to
perform these adjustments only after all repairs and
replacements have been completed. Also, do not attempt
these adjustments unless the proper equipment is available.
4.2 TEST EQUIPMENT REQUIRED
(1) Pattern Generator
(2) Color Analyzer
4.3 HOW TO ENTER THE SERVICE MODE
(1) Turn the power on.
(2) While pressing [MUTE] button, press [i] button on the
remote control unit.
4.4 PURITY CHECK MODE
This mode cycles through full-screen displays of red, green, blue,
and white to check for non-active pixels.
(1) Enter the Service mode.
(2) Each time pressing [7] key on the service remote control
unit, the display changes as follows.
[7] button
Note:
When entering this mode, the default setting is White mode.
Purity Check Mode
[7] button
Red mode
Green mode
Blue mode
Black mode
[7] button
White mode
[7] button
[7] button
White 25% mode
[7] button

1-14 (No.YA683<Rev.001>)
4.5 VCOM ADJUSTMENT.
(1) Operate the unit for more than 20 minutes.
(2) Set the color analyzer and bring the optical receptor to the
center on the LCD-Panel surface after zero point calibra-
tion as shown above.
NOTE:
The optical receptor must be set perpendicularly to the
LCD Panel surface.
(3) Enter the Service mode.
(4) [VCOM1]
Press [2] key on the service remote control unit.
[VCOM2]
Press [3] key on the service remote control unit.
(5) Press [P / ] bkey on the service remote control unit so
that the color analyzer value becomes minimum.
4.6 WHITE BALANCE ADJUSTMENT
The following adjustment normally are not attempted in the field.
Only when replacing the LCD Panel then adjust as a preparation.
PURPOSE:
To mix red, green and blue beams correctly for pure white.
SYMPTOM OF MISADJUSTMENT:
White becomes bluish or reddish.
(1) Operate the unit for more than 20 minutes.
(2) Input the White Raster(70%=70IRE, 25%=25IRE).
(3) Set the color analyzer to the CHROMA mode and bring the
optical receptor to the center on the LCD-Panel surface af-
ter zero point calibration as shown above.
NOTE:
The optical receptor must be set perpendicularly to the
LCD Panel surface.
(4) Enter the Service mode. Press [VOLUME -] button on the
service remote control unit and select “C/D” mode.
(5) [CUTOFF]
Press [3] key to select “COB” for Blue Cutoff adjustment.
Press [1] key to select “COR” for Red Cutoff adjustment.
[DRIVE]
Press [6] key to select “DB” for Blue Drive adjustment.
Press [4] key to select “DR” for Red Drive adjustment.
(6) In each color mode, press [P / ] buttons to adjust the
values of color.
(7) Adjust Cutoff and Drive so that the color temperature be-
comes 12000°K (x= 0.272 / y= 0.278 ±0.005).
Test Point Adj. Point
Screen
M. EQ. Spec.
Color analyzer See below
Figure
Color Analyzer
It carries out in a darkroom.
L = 3 cm
Perpendicularity
[P ]
buttons
/
Test Point Adj. Point Mode Input
Screen [P ]
buttons
[VIDEO]
C/D
White Raster
(APL 70%)
or
(APL 30%)
M. EQ. Spec.
Pattern Generator,
Color analyzer
x= 0.272 ± 0.005
y= 0.278 ± 0.005
Figure
Color Analyzer
It carries out in a darkroom.
L = 3 cm
Perpendicularity
INPUT: WHITE 70%, 30%
/
30%=30IRE 70%=70IRE
INPUT SIGNAL

(No.YA683<Rev.001>)1-15
4.7 HOW TO VERIFY THE PROTECT MODE
The Sub CPU always surveys the power supply circuit. If the ab-
normal voltage is detected on the power supply circuit, a voltage
is not supplied.
Perform the following procedures for confirmation.
(1) Enter the service mode.
(2) The following screen appears.
Indication of Safety
4.8 HOW TO INITIALIZE THE LCD TELEVISION
(1) Turn the power on.
(2) To enter the service mode.
• To cancel the service mode, press [POWER] key on the
remote control unit.
(3) Press [AV] key on the service remote control unit to initial-
ize the LCD television.
(4) "INITIALIZED" will appear in the upper right of the screen.
"INITIALIZED" color will change to green from red when
initializing is complete.
INDICATION DESCRIPTION
Safety_Non The power supply circuit is normal.
Safety1 The power supply circuit is abnormal.
(Protect1)
Safety2 The reduced voltage detection circuit is
abnormal. (Protect2)
Safety3 The inverter circuit is abnormal. (Protect3)
Code :
Boot :
System :
SubCPU :
Pic Code :
Picture :
Panel :
Other :
Safety :
HDMI1 Block0 :
Block1 :
HDMI2 Block1 :
**********-***
**** * ***
**** * ***
****
**-***-**-****-***
****
***
**
Safety_Non
**
**
**
SPAIN
"*" differs depending on the models.
Display protection mode

1-16 (No.YA683<Rev.001>)
SECTION 5
TROUBLESHOOTING
Check IC601, D610, D615 and their periphery, and
service it if defective.
The power cannot be turned on.
The fuse blows out.
FLOW CHART NO.1
FLOW CHART NO.2
Is normal state restored when once unplugged power
cord is plugged again several seconds?
Check if there is any leak or short-circuiting on the
primary circuit component, and service it if defective.
(IC601, Q600, Q601, D611, D613, D614, D616,
T601, R610)
Ye s
No
Ye s
Is the fuse (F601) normal? See FLOW CHART No.2 <The fuse blows out.>
No
Ye s
Is the AL +12V line voltage normal? No
Check each rectifying circuit of the secondary circuit
and service it if defective.
Check the presence that the primary component is
leaking or shorted and service it if defective.
Check the presence that the rectifying diode or circuit
is shorted in each rectifying circuit of secondary side,
and service it if defective.
After servicing, replace the fuse (F601).
When the output voltage fluctuates.
FLOW CHART NO.3
Does the photocoupler circuit on the secondary side
operate normally?
No
Ye s
Check IC601, Q900, D913 and their periphery, and
service it if defective.
When buzz sound can be heard in the vicinity of power circuit.
FLOW CHART NO.4
Check if there is any short-circuit on the rectifying diode and the circuit in each rectifying circuit of the secondary side, and
service it if defective. (IC900, IC902, D900, D903, D904, D905, D906, D924, D990, Q901, Q902, Q906, Q908, Q911, Q922, Q936)
Check if there is any leak or short-circuit on the loaded
circuit, and service it if defective.
+35V is not output.
FLOW CHART NO.5
Is approximately 35V voltage supplied to the cathode
of D903?
No
Ye s
Check D903, D908, C903 and their periphery circuit,
and service it defective.

(No.YA683<Rev.001>)1-17
Check if there is any leak or short-circuit on the loaded
circuit, and service it if defective.
INV+22V is not output.
FLOW CHART NO.6
Is approximately 22V voltage supplied to the cathode
of D990?
No
Ye s
Check D990, C902 and their periphery circuit, and
service it defective.
P-ON+5V is not output.
FLOW CHART NO.8
Ye s
Ye s
No
Is approximately 6V voltage supplied to the base of
Q936?
See FLOW CHART No.7
AL+3.3V is not output.
FLOW CHART NO.7
Ye s
No
Is approximately 8V voltage supplied to the cathode
of D924?
Check D924, C917 and their periphery circuit, and
service it if defective.
Check Q901, D916 and their periphery circuit, and
service it if defective.
Is approximately 8V voltage supplied to the collector
of Q936?
Replace Q936.
No
See FLOW CHART No.9
LCD+24.5V is not output.
FLOW CHART NO.9
Ye s
No
Is approximately 38V voltage supplied to the cathode
of D903?
Is approximately 38V voltage supplied to the collector
of Q911?
Is the voltage of base on Q911 lower than the voltage
of emitter on Q911 when turning the power on?
Ye s
Replace Q911.
Check D903, D908, C903 and their periphery circuit,
and service it if defective.
Ye s
Check D923 and their periphery circuit, and service it
if defective.
No
Check Q912 and P-ON-H1 line, and service it if
defective.
No

1-18 (No.YA683<Rev.001>)
LCD+3.3V is not output.
FLOW CHART NO.12
Is approximately 8V voltage supplied to the cathode of
D924?
Is approximately 4V voltage supplied to the base of Q902?
LCD+13V is not output.
FLOW CHART NO.10
Is approximately 23V voltage supplied to the cathode
of D990?
Is approximately 13V voltage supplied to the base of Q922?
No
No
Ye s
Ye s
Check D990, C902 and their periphery circuit, and
service it if defective.
Check D905, C905 and their periphery circuit, and
service it if defective.
Check R945 and their periphery circuit, and service it
if defective.
Ye s
No
Ye s
Replace Q908.
Ye s
Replace Q902.
Replace Q922.
See FLOW CHART No.9
No
Check D924, C917 and their periphery circuit, and
service it if defective.
No
Check D920, R930 and their periphery circuit, and
service it if defective.
No
LCD-6.8V is not output.
FLOW CHART NO.11
Is approximately -12V voltage supplied to the anode of
D905?
Is approximately -11V voltage supplied to the base of
Q908?
Ye s
Is approximately 18V voltage supplied to the collector
of Q922?
No
Check R953, R954, R955 and their periphery circuit,
and service it if defective.
Ye s
Is approximately 7V voltage supplied to the collector
of Q902?
Ye s
Check D974, D975 and their periphery circuit, and
service it if defective.
No

(No.YA683<Rev.001>)1-19
+3.5V is not output.
FLOW CHART NO.13
Is approximately 3.5V voltage supplied to the cathode
of D906?
Check if there is any leak or short-circuit on the
loaded circuit, and service it if defective.
Ye s
Check D906, C907 and their periphery circuit, and
service it if defective.
No
P-ON+9V is not output.
FLOW CHART NO.15
Ye s
No
Is approximately 14V voltage supplied to the
collector of Q906?
Is approximately 10V voltage supplied to the
base of Q906?
No
See FLOW CHART No.9
Ye s
Replace Q906.
Replace IC902.
P-ON+3.3V is not output.
FLOW CHART NO.14
Is approximately 5V voltage supplied to the Pin(1) of
IC902?
Ye s
Check D900, C900 and their periphery circuit, and
service it if defective.
Check D904, C904 and their periphery circuit, and
service it if defective.
No
When pressing each switches (SW201, SW202,
SW203, SW204, SW205, SW206, SW207) do the
voltage of Pin(1) on CN104A increase?
Ye s
No
The key operation is not functioning.
FLOW CHART NO.16
Are the contact point and installation state of the key
switches (SW201, SW202, SW203, SW204,
SW205, SW206, SW207) normal?
Re-install the switches (SW201, SW202, SW203,
SW204, SW205, SW206, SW207) correctly or
replace the poor switch.
No Check the switches (SW201, SW202, SW203,
SW204, SW205, SW206, SW207) and their
periphery, and service it if defective.
Ye s
Replace Digital Main PWB Unit.

1-20 (No.YA683<Rev.001>)
No
Is the "L" pulse sent out Pin(1) of RS301 (remote control
receiver) when the infrared remote control is activated?
Check the line between Pin(1) of RS301 (remote
control receiver) and Pin(4) of CN104A, and service
it if defective.
Ye s
Is the "L" pulse supplied to the Pin(4) of CN104A?
Ye s
Is 3.3V voltage supplied to Pin(2) of RS301 (remote
control receiver)?
Are the composite video signals outputted to the
Pin(15) of IC851?
No
No operation is possible from the remote control unit.
FLOW CHART NO.17
Operation is possible from the unit.
Check AL+3.3V line and service it if defective.
No Replace the RS301 (remote control receiver) or
remote control unit.
Ye s
Replace Digital Main PWB Unit.
Picture does not appear normally. (Video input/S-Video input/Y/Pb/Pr input/RGB input)
Are the video signals outputted to the specific
terminal?
Check the luminance signal line, and service it if
defective.
Check the chrominance signal line, and service it if
defective.
Check the RGB video signal line, and service it if
defective.
Check the component video(Y/Pb/Pr) signal line,
and service it if defective.
Check the line between each pin of CN101A and
CN102A and input terminal and service it if defective.
No
No
No
No
No
Ye s
Are the luminance signals outputted to the Pin(23) of
CN101A?
Are the chrominance signals outputted to the Pin(25)
of CN101A?
Are the component video(Y/Pb/Pr) signals outputted
to the Pin(18, 20, 21) of CN101A?
Are the RGB video signals outputted to the Pin(3, 4, 5)
of CN102A?
Are the composite video signals outputted to the Pin(1)
of CN102A?
(RCA JACK input)
Are the composite video signals inputted to the Pin(2)
of IC851?
(SCART JACK input)
Are the composite video signals inputted to the Pin(1)
of IC851?
Check the line between Pin(2) of IC851 and JK722,
and service it if defective.
Check the line between Pin(15) of IC851 and Pin(1) of
CN102A, and service it if defective.
Replace Digital Main PWB Unit or LCD Module
Assembly.
Ye s
Ye s
Ye s
FLOW CHART NO.18
No
Check the line between Pin(1) of IC851 and JK751,
and service it if defective.
No
Is approximately 9V voltage supplied to the Pin(16) of
IC851?
Replace IC851. Check P-ON+9V line,
and service it if defective.
No
Ye s No