JVC LT-20J50SJ User manual

SERVICE MANUAL
COPYRIGHT © 2006 Victor Company of Japan, Limited No.YA413
2006/5
LCD PANEL TELEVISION
YA41320065
LT-20J50SJ,
LT-20J50SU
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17

1-2 (No.YA413)
SPECIFICATION
Design & specifications are subject to change without notice.
Items Contents
Dimensions ( W ×H ×D ) 53.0cm ×47.7cm ×21.3cm [Included stand]
53.0cm ×44.0cm ×12.5cm [TV only]
Mass 8.2kg [Included stand]
7.2kg [TV only]
Power Input
ADAPTOR
TV
AC100 - 240V 50Hz
DC12V
Power Consumption 60W (Standby:1.2W)
TV RF System CCIR (B/G, DK, I, L)
Colour System PAL / SECAM / NTSC 3.58/4.43 [EXT only]
Stereo System A2 (B/G) / NICAM (B/G, I, L)
Receiving Frequency VHF
UHF
CATV
47 MHz - 470 MHz
470 MHz - 862 MHz
S1 - S20 / S21 - S41
Intermediate
Frequency
VIF
SIF
38.9 MHz (B/G, I, L)
33.4 MHz (5.5MHz : B/G)
32.9 MHz (6.0MHz : I)
32.4 MHz (6.5MHz : L)
Colour Sub
Carrier Frequency
PAL
SECAM
NTSC
4.43 MHz
4.40625 MHz / 4.25MHz
3.58 MHz / 4.43 MHz
Teletext System FLOF (Fastext level 2.5), WST(World Standard system)
TOP (German system)
LCD panel 20V-inch (4 : 3)
Screen Size Diagonal : 50.9cm (H: 40.8cm ×V: 30.6cm)
Display Pixels Horizontal : 800 dots ×Vertical : 600 dots (SVGA)
Audio Power Output 3W + 3W(10% THD)
Speaker 3cm ×10cm ×2
Aerial terminal (VHF/UHF) F-type connector, 75Ωunbalanced, coaxial
EXT-1 (Input / Output) 21-pin Euro connector (SCART socket ) ×1
EXT-2 (Input) 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 Ω, RCA pin jack ×1
500mV (rms), High impedance, RCA pin jack ×2
PC (RGB) Input D-sub 15pin ×1
R/G/B : 0.7V (p-p), 75Ω
HD / VD : 1V (p-p) to 5V (p-p), high impedance
< Available signal >
Horizontal : 30kHz - 69kHz
Vertical : 50Hz - 70Hz
[Resolution : 640 pixels × 480 pixels(VGA), 800 pixels × 600 pixels(SVGA), 1024 pixels × 768 pixels (XGA)]
PC AUDIO input 3.5mm stereo mini jack ×1
Headphone 3.5mm stereo mini jack ×1
Remote Control Unit RM-C1861 (AA/R6 dry cell battery ×2)

(No.YA413)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
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.YA413)
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.

(No.YA413)1-5
1.3 INSTALLATION
1.3.1 HEAT DISSIPATION
If the heat dissipation vent behind this unit is blocked, cooling
efficiency may deteriorate and temperature inside the unit will
rise. The temperature sensor that protects the unit will be
activated when internal temperature exceeds the pre-determined
level and power will be turned off automatically.Therefore,
please make sure pay attention not to block the heat dissipation
vent as well as the ventilation outlet behind the unit and ensure
that there is room for ventilation around it.
1.3.2 INSTALLATION REQUIREMENTS
Ensure that the minimal distance is maintained, as specified
below, between the unit with and the surrounding walls, as well
as the floor etc.Install the unit on stable flooring or stands.Take
precautionary measures to prevent the unit from tipping in order
to protect against accidents and earthquakes.
1.3.3 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
*Diagram differs from actual appearance.
100 mm
100 mm
100 mm
100 mm
50 mm

1-6 (No.YA413)
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 COLOUR.
(2) Clean the filter surface by wiping it softly and lightly with a
soft and lightly fuzz cloth (such as outing flannel).
(3) Do not use solvents such as benzene or thinner to wipe the
filter surface. This may cause the filter to deteriorate in
quality or the coating on the surface to come off. When
cleaning the filter, usually use the neutral detergent diluted
with water. When cleaning the dirty filter, use water-diluted
ethanol.
(4) Since the filter surface is fragile, do not scratch or hit it with
hard materials. Be careful enough not to touch the front
surface, especially when taking the unit out of the packing
case or during transportation.
1.4.3 PRECAUTIONS FOR REPLACEMENT OF EXTERIOR
PARTS
Take note of the following when replacing exterior parts (REAR
COVER, FRONT PANEL, etc.):
(1) Do not exert pressure on the front of the LCD panel (filter
surface). It may cause irregular COLOUR.
(2) Pay careful attention not to scratch or stain the front of the
LCD panel (filter surface) with hands.
(3) When replacing exterior parts, the front (LCD panel) should
be placed facing downward. Place a mat, etc. underneath
to avoid causing scratches to the front (filter surface).

(No.YA413)1-7
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
2.1 FEATURES
ZOOM
This function can change the screen size according to the
picture aspect ratio.
OFF TIMER
This function can set the TV to automatically turn off after a set
time.
COLOUR SYSTEM
If the picture is not clear or no colour appears, change the
current colour system to another colour system.
2.2 21-PIN EURO CONNECTOR (SCART) : EXT-1
(P-P= Peak to Peak, B-W= Blanking to white peak)
Pin No. Signal designation Matching value EXT-1
1 AUDIO R output 500mV(rms) (Nominal),, Low impedance Used (TV OUT)
2 AUDIO R input 500mV(rms) (Nominal),, High impedance Used (R1)
3 AUDIO L output 500mV(rms) (Nominal),, Low impedance Used (TV OUT)
4 AUDIO GND Used
5 GND (B) Used
6 AUDIO L input 500mV(rms) (Nominal),, High impedance Used (L1)
7 B input 700mV(B-W), 75ΩUsed
8 FUNCTION SW
(SLOW SW)
Low : 0V-3V
High : 8V-12V, High impedance
Used
9 GND (G) Used
10 SCL / T-V LINK Not used
11 G input 700mV(B-W), 75ΩUsed
12 SDA Not used
13 GND (R) Used
14 GND (YS) Used
15 R / C input R : 700mV(B-W), 75Ω
C : 300mV(P-P), 75ΩUsed (R/C)
16 Ys input (FAST SW) Low : 0V-0.4V, High : 1V-3V, 75ΩUsed
17 GND (VIDEO output) Used
18 GND (VIDEO input) Used
19 VIDEO output 1V(P-P) (Negative sync), 75ΩUsed (TV OUT)
20 VIDEO / Y input 1V(P-P) (Negative sync), 75ΩUsed
21 COMMON GND Used
20 18 16 14 12 10 8 6 4 2
21 19 17 15 13 11 9 7 5 3 1
[Pin assignment]

1-8 (No.YA413)
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.
BRIGHT FAULT
In this pixel fault, a cell that should not light originally is lighting on and off.
For checking this pixel fault, input ALL BLACK SCREEN and find out the cell that is lighting on and off.
DARK FAULT
In this pixel fault, a cell that should light originally is not lighting or lighting with the brightness twice as brighter as originally lighting.
For checking this pixel fault, input 100% of each R/G/B colour and find out the cell that is not lighting.
FLICKER FAULT
In the pixel fault, a cell that should light originally or not light originally is flashing on and off.
For checking this pixel fault, input ALL BLACK SCREEN signal or 100% of each RGB colour and find out the cell that is flashing on
and off.
Item Specifications Remarks
Displayed colour 16777216 colours 256 colours for R, G, and B
Brightness 450cd/m2
Contrast ratio 500 : 1
Response time 16ms
View angle Horizontally: 160°, Vertically: 120°

(No.YA413)1-9
SECTION 3
DISASSEMBLY
3.1 DISASSEMBLY PROCEDURE
NOTE:
• 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.
3.1.1 REMOVING THE HINGE COVER
(1) Remove the 2 screws [A].
(2) Remove the HINGE COVER.
3.1.2 REMOVING THE FOOT TOP COVER
• Remove the HINGE COVER.
(1) Remove the 2 screws [B].
(2) Pull out the FOOT TOP COVER.
3.1.3 REMOVING THE FOOT ASSEMBLY
(1) Remove the 4 screws [C].
(2) Remove the FOOT ASSEMBLY.
3.1.4 REMOVING THE HANDLE
• Remove the HINGE COVER.
• Remove the FOOT TOP COVER.
(1) Remove the 4 screws [D].
(2) Remove the THE HANDLE.
3.1.5 REMOVIE BACK COVER
• Remove the FOOT ASSEMBLY.
(1) Remove the 7 screws [E].
(2) Remove the BACK COVER toward you.
NOTE:
If necessary, remove the HANDLE, SIDE AV DOOR and
BACK DOOR.
3.1.6 REMOVING THE SIDE CONTROL PWB
• Remove the FOOT ASSEMBLY.
• Remove the BACK COVER.
(1) Remove the 2 screws [F].
(2) Remove the FUNCTION BUTTON with SIDE CONTROL
PWB.
(3) Remove the 4 claws which is fixing the SIDE CONTROL
PWB.
(4) Remove the SIDE CONTROL PWB.
3.1.7 REMOVING THE AV JACK PWB
• Remove the FOOT ASSEMBLY.
• Remove the BACK COVER.
(1) Remove the 4 screws [G].
(2) Remove the AV JACK PWB.
3.1.8 REMOVING THE METAL HANG
• Remove the FOOT ASSEMBLY.
• Remove the HANDLE.
• Remove the BACK COVER.
(1) Remove the 1 screw [H].
(2) Remove the METAL HANG.
(3) Remove the opposite METAL HANG same steps.
3.1.9 REMOVING THE BRACKET SOCKET COVER
• Remove the FOOT ASSEMBLY.
• Remove the BACK COVER.
(1) Remove the 2 screws [J].
(2) Remove the BRACKET SOCKET COVER.
3.1.10 REMOVING THE MAIN PWB
• Remove the FOOT ASSEMBLY.
• Remove the BACK COVER.
• Remove the BRACKET SOCKET COVER.
(1) Remove the 5 screws [K].
(2) Remove the MAIN PWB.
3.1.11 REMOVING THE LED PWB
• Remove the FOOT ASSEMBLY.
• Remove the BACK COVER.
(1) Remove the 2 screws [L].
(2) Remove the LED PWB.
3.1.12 REMOVING THE SPEAKER
• Remove the FOOT ASSEMBLY.
• Remove the BACK COVER.
(1) Remove the speaker wire from speaker terminal.
(2) Remove the 2 screws [M].
(3) Remove the SPEAKER.
(4) Remove the opposite speaker same steps.
3.1.13 REMOVING THE LCD PANEL UNIT
• Remove the FOOT ASSEMBLY.
• Remove the BACK COVER.
• Remove the MAIN PWB.
• Remove the REGULATOR PWB.
• Remove the AV JACK PWB.
(1) Remove the 6 screws [N].
(2) Remove the 5 screws [P] fixing the DISPLAY SUPPORT
and LCD PANEL UNIT.
(3) Sightly raise the both sides of the LCD PANEL by hand
from the FRONT COVER.
NOTE:
• Pay special attention not to break or damage on the front of
the LCD PANEL.
• The LCD PANEL UNIT is fixed to the FRONT COVER (at the
back side)by using double-side adhesive tapes. To remove
the LCD PANEL UNIT, remove the adhesive tape on the
FRONT COVER slowly.

1-10 (No.YA413)
D
E
HANDLE
BACK COVER
F
K
N
J
C
METAL HANG
FOOT ASSEMBLY
FOOT TOP COVER
HINGE COVER
CABLE
HOLDER
BACK DOOR
SPEAKER
LED PWB
LED LENS
SIDE CONTROL PWB
FUNCTION BUTTON
CABLE
HOLDER
H
M
L
M
AV JACK PWB
BRACKET SOCKET
COVER
MAIN PWB
LCD PANEL UNIT
DISPLAY SUPPORT
FRONT COVER
G
A
N
P
B

(No.YA413)1-11
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 SETTINGS OF FACTORY SHIPMENT
3.2.1.1 BUTTON OPERATION 3.2.1.2 REMOTE CONTROL DIRECT OPERATION
3.2.1.3 REMOTE CONTROL MENU OPERATION
(1) PICTURE
(2) SOUND
(3) FEATURE
(4) INSTALLATION
Setting item Setting position
POWER Off
TV/AV TV
Setting item Setting position
ZOOM Auto
Setting item Setting position
Mode Bright
Contrast 75 Step
Bright-1 30 Step
Sharpness 25 Step
Colour 32 Step
Bright-2 Max.
Colour Temperature Cool
Hue 25 Step
Setting item Setting position
Volume 10 Step
Bass 0 Step
Treble 0 Step
Balance 0 Step
Hyper Sound Off
Setting item Setting position
Sleep Timer Off
Child Lock Off
Language English
Blue Back Off
Setting item Setting position
Colour System AUTO
VCR Off

1-12 (No.YA413)
3.3 REPLACEMENT OF CHIP COMPONENT
3.3.1 CAUTIONS
(1) Avoid heating for more than 3 seconds.
(2) Do not rub the electrodes and the resist parts of the pattern.
(3) When removing a chip part, melt the solder adequately.
(4) Do not reuse a chip part after removing it.
3.3.2 SOLDERING IRON
(1) Use a high insulation soldering iron with a thin pointed end of it.
(2) A 30w soldering iron is recommended for easily removing parts.
3.3.3 REPLACEMENT STEPS
1. How to remove Chip parts
[Resistors, capacitors, etc.]
(1) As shown in the figure, push the part with tweezers and
alternately melt the solder at each end.
(2) Shift with the tweezers and remove the chip part.
[Transistors, diodes, variable resistors, etc.]
(1) Apply extra solder to each lead.
(2) As shown in the figure, push the part with tweezers and
alternately melt the solder at each lead. Shift and remove
the chip part.
NOTE :
After removing the part, remove remaining solder from the
pattern.
2. How to install Chip parts
[Resistors, capacitors, etc.]
(1) Apply solder to the pattern as indicated in the figure.
(2) Grasp the chip part with tweezers and place it on the
solder. Then heat and melt the solder at both ends of the
chip part.
[Transistors, diodes, variable resistors, etc.]
(1) Apply solder to the pattern as indicated in the figure.
(2) Grasp the chip part with tweezers and place it on the
solder.
(3) First solder lead Aas indicated in the figure.
(4) Then solder leads Band C.
SOLDER SOLDER
A
B
C
A
B
C

(No.YA413)1-13
SECTION 4
ADJUSTMENT
4.1 ADJUSTMENT PREPARATION
(1) The setting (adjustment) using the REMOTE CONTROL UNIT is made on the basis of the initial setting values.
The setting values which adjust the screen to the optimum condition can be different from the initial setting values.
(2) Make sure that connection is correctly made to AC power source.
(3) Turn on the power of the monitor and measuring instrument for warming up for at least 30 minutes before starting adjustment.
(4) If the input signal is not specified, use the most appropriate signal for adjustment.
(5) Never touch parts (such as variable resistors, transformers and condensers) or setting items/values not shown in the adjustment
items of this service adjustment.
4.2 BASIC OPERATION OF UOCIII SERVICE MODE
4.2.1 HOW TO ENTER THE UOCIII SERVICE MODE
(1) Press [MENU] key.
(2) Press the [4], [7], [2] and [5] key, and UOCIII SERVICE
MODE screen will be displayed.
UOCIII SERVICE MODE SCREEN
4.2.2 HOW TO EXIT THE UOCIII SERVICE MODE
Press [MENU] key to exit the UOCIII SERVICE MODE.
4.2.3 CHANGE AND MEMORY OF SETTING VALUE
SELECTION OF SETTING MENU & ITEM
•[P +/-] key.
CHANGE OF SETTING VALUE(DATA)
•[Volume +/-] key.
MEMORY OF SETTING VALUE(DATA)
The setting value will be stored automatically when release the
REMOTE CONTROL UNIT keys.
4.2.4 UOCIII SERVICE MODE SELECT KEY LOCATION
GTV 3.2.1
000 EurAsia TVSub 00.95
00000000 00111100
01000000 01100100
11000101 01100100
00000000 01100100
[MENU]
[Volume +/-]
Number key
[P +/-]

1-14 (No.YA413)
4.2.5 UOCIII SERVICE MODE SETTING ITEMS
Item
No.
Setting
items Function Variable
range
Setting
value
000
EurAsia TVSub --- 00.95
001 Init TV Sets the UOC default values and turns
the tv to Stdby
0-1 0
002 ISP Mode Sets the TV into ISP state. 0-1 0
003 DCXO DCXO crystal alignment 0-127 77
004 DCXO Auto Automatic DCXO frequency
alignment. When it is set to 1; UOC
automaticaly calculates DCXO values
and writes it to item number 3.
0-1 0
005 Track. Mode 0-1 0
006 Hor. Shift 0-63 32
007 HBL 0-1 0
008 WBF 0-15 4
009 WBR 0-15 8
010 WSS WSS (Wide Screen Siganling) enable 0-1 1
011 Gld-SCART 0-1 1
012 Col Fe Color Saturation adjustment for RF
input
0-50 32
013 Col AV1 Color Saturation adjustment for Scart
CVBS input
0-50 32
014 Col AV1S 0-50 32
015 Col AV2 Color Saturation adjustment for AV
CVBS input
0-50 32
016 Col AV2S Color Saturation adjustment for for
SVHS S-video input
0-50 32
017 BLOR 0-63 32
018 BLOG 0-63 32
019 RGB 0-15 14
020 YSECAM "Y delay" setting. (SECAM) 0-15 8
021 YNTSC "Y delay" setting. (NTSC) 0-15 8
022 YPAL "Y delay" setting. (PAL) 0-15 8
023 YAV1 "Y delay" setting. (SCART) 0-15 4
024 YAV2 "Y delay" setting. (FAV) 0-15 4
025 YSVHS1 "Y delay" setting. 0-15 4
026 YSVHS2 "Y delay" setting. (S-Video) 0-15 4
027 ACL 0-1 0
028 MUS 0-1 0
029 PWL 0-15 8
030 CB 0-1 0
031 BPS 0-1 0
032 FCO 0-1 0
033
PeakFreqPAL443 0-3 1
034
PeakFreqPALM 0-3 1
035
PeakFreqPALN 0-3 1
036
PeakFreqNTSC443 0-3 1
037
PeakFreqNTSCM 0-3 1
038
PeakFreqSECAM 0-3 1
039 PeakFreqAV 0-3 1
040 Blackstretch 0-1 1
041 Bluestretch 0-1 0
042 Whitestretch 0-3 0
043 Transfer Ratio 0-1 1
044
PeakRatioOvShot 0-3 1
045 Tint NTSC 0-50 31
046 OSO 0-1 0
047 FSL 0-1 0
048 HP2 0-1 0
049 SoftClipLevel 0-3 0
050
OP AUDIO CONFIG 0-2 2
051 OP BILING 0-1 1
052 OP HP 0-1 1
053 OP EQUAL 0-1 1
054 OP DOLBY 0-1 0
055 OP TRUSUR 0-1 0
056 OP DUB DBE 0-1 0
057 OP BBE 0-1 0
058 AVL-LEV AVL Level setting 0-15 1
059 AVL-WGT AVL Weight setting 0-1 0
060 AVL-MOD AVL Response Time setting 0-5 2
061 AVLE AVL enable/disable 0-1 1
062 LOUD-NA 0-7 5
063 LOUD-CH 0-1 1
064 BBE-CONT 0-15 7
065 BBE-PROC 0-15 7
066 OP CLIP 0-4 0
067 DEC-LEV
FM German Str. Prescale setting 0-31 23
068 MONO-LEV FM Mono Prescale setting 0-31 23
069 NIC-LEV Nicam Str. Prescale setting 0-31 17
070 ADC-AM-L AM Mono Prescale setting 0-31 21
071 ADC-AV-L Scart/Line in Prescale setting 0-31 18
072 BGSCAL DEC 0-31 0
073
BGSCAL MONO 0-31 0
074 BGSCAL NIC 0-31 0
075 BGSCAL SAP 0-31 0
076 MSCAL DEC 0-31 0
077 MSCAL MONO 0-31 0
078 MSCAL NIC 0-31 0
079 MSCAL SAP 0-31 0
080 LSCAL DEC 0-31 0
081 LSCAL MONO 0-31 0
082 LSCAL NIC 0-31 0
083 LSCAL SAP 0-31 0
084 E2D 0-1 0
085 FFI 0-1 0
086 CMUTE 0-1 1
087 PA-BA-VO 0-63 31
088 PA-TR-VO 0-63 15
089 PA-LM-VO 0-4 1
090 PA-ST-VO 0-5 5
091 PA-LO-VO 0-1 0
092 PA-B1-VO 0-63 21
093 PA-B2-VO 0-63 50
094 PA-B3-VO 0-63 55
095 PA-B4-VO 0-63 45
096 PA-B5-VO 0-63 34
097 PA-BA-MU 0-63 34
098 PA-TR-MU 0-63 39
099 PA-LM-MU 0-4 1
100 PA-ST-MU 0-5 5
101 PA-LO-MU 0-1 1
102 PA-B1-MU 0-63 52
103 PA-B2-MU 0-63 47
104 PA-B3-MU 0-63 29
105 PA-B4-MU 0-63 29
106 PA-B5-MU 0-63 45
107 PA-BA-TH 0-63 36
Item
No.
Setting
items Function Variable range
Setting
value

(No.YA413)1-15
4.3 BASIC OPERATION OF PW SERVICE MODE
4.3.1 HOW TO ENTER THE PW SERVICE MODE
(1) Press [INFORMATION] key and [MUTING] key
simultaneously, and PW SERVICE MODE screen will be
displayed.
4.3.2 HOW TO EXIT THE PW SERVICE MODE
Press [MENU] key to exit the PW SERVICE MODE.
4.3.3 CHANGE AND MEMORY OF SETTING VALUE
SELECTION OF SETTING MENU & ITEM
•[FUNCTION /]and [FUNCTION /]key.
CHANGE OF SETTING VALUE(DATA)
•[FUNCTION /]key.
MEMORY OF SETTING VALUE(DATA)
<In case of Service Submenu 1 and Service Submenu 2>:
The setting value will be stored automatically when release
the REMOTE CONTROL UNIT keys.
<In case of Factory Settings 1 and Factory Settings 2>:
(1) Press [MENU] key.
(2) Press the [4], [7], [2] and [9] key to store the setting
value.
(3) After storing the setting value, the message "Factory
Settings OK" will be displayed.
4.3.4 PW SERVICE MODE SELECT KEY LOCATION
108 PA-TR-TH 0-63 34
109 PA-LM-TH 0-4 1
110 PA-ST-TH 0-5 5
111 PA-LO-TH 0-1 0
112 PA-B1-TH 0-63 47
113 PA-B2-TH 0-63 45
114 PA-B3-TH 0-63 42
115 PA-B4-TH 0-63 45
116 PA-B5-TH 0-63 42
117 AGC Speed AGC Speed setting 0-3 1
118
AGC Take over AGC setting 0-63 27
119 OIF IF Demodulator Offset 0-63 32
120 IF IF Frequency 0-5 2
121 SVO 0-1 0
122 GD 0-1 1
123 BPB 0-1 0
124 BPB2 0-1 0
125 RGB-IN 0-1 1
126 DVD1-IN 0-1 0
127 AV2-IN 0-1 1
128 DVD2-IN 0-1 0
129 AV1S-IN 0-1 1
130 AV1D-IN 0-1 0
131 AV2S-IN 0-1 1
132 CBVS-OUT 0-1 1
133 INCL-AV 0-1 0
134 OTHER1 0-1 0
135 OTHER2 0-1 0
136 TXT-H-POS 0-31 11
137
OTHER:BG-DK 0-1 0
138 TIM-SLP 0-1 1
139 TIM-SW 0-1 1
140 TIM-OFF 0-1 1
141 TIM-SKP 0-1 1
142 TIM-RT 0-1 1
143 PWR-SAVING 0-1 1
144 PWR-PERF 0-3 3
145 PWR-REST 0-1 1
146 PWR-ONKEY 0-1 1
147 Factory Mode 0-1 0
148 CombFil Combfilter enable/disable 0-1 1
149 ATS 0-1 1
150 EVG 0-1 0
151 DFL 0-1 0
152 XDT 0-1 0
153 AKB 0-1 1
154 OSVE 0-1 0
155 CL 0-15 10
156 LCD-BRT UOC Brightness 0-63 36
157 LCD-CON UOC Contrast 0-63 32
158 LCD-CON-FE RF Frontend Contrast adjust. 0-63 30
159
LCD-CON-AV1 Scart CVBS Contrast adjust. 0-63 32
160
LCD-CON-AV1S 0-63 32
161
LCD-CON-AV2 AV CVBS Contrast adjust. 0-63 32
162
LCD-CON-AV2S S-Video input Contrast adjust. 0-63 32
163 RBL 0-1 0
164 EGL 0-1 0
Item
No.
Setting
items Function Variable range
Setting
value
165 LPG 0-1 1
166 PGR UOC Red Contrast 0-127 32
167 PGG-CVBS
UOC Green Contrast for CVBS input 0-127 32
168 PGG-RGB
UOC Green Contrast for RGB input 0-127 34
169 PGB UOC Blue Contrast 0-127 32
Item
No.
Setting
items Function Variable range
Setting
value
[MUTING]
[FUNCTION ޓ/ ]
[FUNCTIONޓ/ ]
[INFORMAITION]
[MENU]
Number key

1-16 (No.YA413)
4.3.5 PW SERVICE MODE SETTING ITEMS
Setting menu Setting items Setting value
Service Submenu 1 UOC Hposition 128
ADC_Calibration -
UOC_Calibration -
Service Submenu 2 Panel Type AU_20_VGA_V4WB
Init NVM -
AVL On
PC Mode On
Burn-In Mode Off
Factory Settings 1 Initial APS Off
Language English
Country -
Model Name -
Setting menu
Setting items Setting value
Group TV-CVBS S-VIDEO RGB PC
Mode Bright
Standard Soft Bright Standard Soft Bright Standard Soft Bright Standard Soft
Factory Settings 2 Contrast 38 33 28 43 38 33 38 33 28 30 33 28
Bright-1 14 14 14 18 18 18 14 14 14 14 14 14
Sharpness 40 35 30 40 35 30 40 35 30 - - -
Colour 28 28 26 29 28 26 28 28 26 - - -

(No.YA413)1-17
SECTION 5
TROUBLESHOOTING
This service manual does not describe TROUBLESHOOTING.

(No.YA413)
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

0206TKH-VT-VT
©200 VICTOR COMPANY OF JAPAN, LIMITED6
50083724
CASTELLANO
MANUAL DE INSTRUCCIONES
LCD-TV- ERÄT
PANNEAU LCD TELEVISEUR
TV A SCHERMO LCD
TV CON PANTALLA LCD
INSTRUCTIONS
ENGLISH
DEUTSCH
FRANÇAIS
BEDIENUN SANLEITUN
MANUEL D'INSTRUCTIONS
ITALIANO
ISTRUZIONI
LT-20J50SU
LCD PANEL TV
CASTELLANO
MANUAL DE INSTRUCCIONES
LCD-TV- ERÄT
PANNEAU LCD TELEVISEUR
TV A SCHERMO LCD
TV CON PANTALLA LCD
D:\IB Guncel\JVC 20710_17MB18_RC_1861 (10038686)\GRP1-COVER PAGE-20710-17MB18-1861UK-(LT-20J50SU)-50083724.cdr
24 Şubat 2006 Cuma 11:05:48
Color profile: Disabled
Composite Default screen

ENGLISH - 1 -
For your safety
This equipment has been designed and
manufactured to meet international safety stan-
dards but, like any electrical equipment, care
must be taken if you are to obtain the best
results and safety is to be assured. So, please
read the points below for your own safety. They
are of a general nature, intended to help you
with all your electronic consumer products and
some points may not apply to the goods you
have just purchased.
Some DOs and DONTs for you
Air Circulation
eave at least 10cm clearance around the tele-
vision to allow adequate ventilation. This will
prevent the TV from overheating and conse-
quential possible damage to the TV. Dusty
places should also be avoided.
Heat Damage
Damage may occur if you leave the TV in di-
rect sunlight or near a heater. Avoid places
subject to extremely high temperatures or hu-
midity, or locations where the temperature is
likely to fall below 5ºC (41ºF).
Mains Supply
The mains supply required for this equipment
is 100- 40 V AC, 50 Hz. Never connect to a
DC supply or any other power source. DO en-
sure that the TV is not standing on the mains
lead. DO NOT cut off the mains plug from this
equipment, this incorporates a special Radio
Interference Filter, the removal of which will
impair its performance.
Hot / Moderate Climate Conditions
This device is suitable for working in hot and
moderate climate conditions.
Contents
For your safety ......................................... 1
Important Information ............................. 4
Remote Control Buttons .......................... 5
Control Panel Buttons ............................. 6
Where to install ....................................... 9
Preparation ............................................ 10
Before Switching on your TV ................ 10
Switching the TV ON/OFF .......................11
Initial Settings ........................................ 1
Operating the TV .................................... 1
Menu System ......................................... 13
Other Features ....................................... 18
PC Mode ................................................. 19
Teletext ................................................... 1
Peripheral Equipment Connections .....
Peripheral Equipment Connections ..... 4
Antenna Connections ............................ 5
Peripheral Equipment Connections ..... 5
PC Input Typical Display Modes ......... 6
Tips ......................................................... 7
Specifications ........................................ 8
01-ENG-20710-17MB18-1861UK-(LT-20J50SU)-5008XXXX.p65 24.02.2006, 08:071