JVC LT-15B60SJ User manual

SERVICE MANUAL
COPYRIGHT © 2005 Victor Company of Japan, Limited No.YA306
2005/10
WIDE LCD PANEL TELEVISION
YA306200510
LT-15B60SJ,
LT-15B60SW
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16

1-2 (No.YA306)
SPECIFICATION
Design & specifications are subject to change without notice.
Items Contents
Dimensions ( W ×H ×D ) 48.9cm ×35.3cm ×18.3cm [Included stand]
48.9cm ×30.4cm ×6.2cm [TV only]
Mass 7.5kg [Included stand]
6.0kg [TV only]
Power Input DC12V
AC220 ~ 240V 50Hz
Power Consumption 41W (Standby: 3.0W)
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
47 MHz - 470 MHz
470 MHz - 862 MHz
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 15V-inch (4 : 3)
Screen Size Diagonal : 38.1cm (H: 30.4cm ×V: 22.8cm)
Display Pixels Horizontal : 1024 dots ×Vertical : 768 dots (XGA)
Audio Power Output 3W + 3W(10% THD)
Speaker 3.3cm ×10.5cm ×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 - 57kHz
Vertical : 50Hz - 72Hz
[ 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.YA306)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.YA306)
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.YA306)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.
*Diagram differs from actual appearance.
Ventilation hole
*Diagram differs from actual appearance.
100 mm
100 mm
100 mm
100 mm
50 mm

1-6 (No.YA306)
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.YA306)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)
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.YA306)
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 400: 1
Response time 25ms
View angle Horizontally: 176°, Vertically: 176°

(No.YA306)1-9
2.4 BASIC OPERATION OF UOCIII SERVICE MODE
2.4.1 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
2.4.2 HOW TO EXIT THE UOCIII SERVICE MODE
Press [MENU] key to exit the UOCIII SERVICE MODE.
2.4.3 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.
2.4.4 UOCIII SERVICE MODE SELECT KEY LOCATION
2.4.5 UOCIII SERVICE MODE SETTING ITEMS
GTV 3.2.1
000 EurAsia TVSub 05.01
00000000 00111100
01000000 01100100
11000101 01100100
00000000 01100100
[MENU]
[Volume +/-]
Number key
[P +/-]
Item
No. Setting items Function Setting value
000
EurAsia TVSub 05.01
001 Init TV Sets the UOC default values
and turns the tv to Stdby
0
002 ISP Mode Sets the TV into ISP state. 0
003 DCXO DCXO crystal alignment 70
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
005 Rotation 31
006 Hor. Shift 32
007 HBL 0
008 WBF 4
009 WBR 8
010 WSS WSS (Wide Screen Sigan-
ling) enable
1
011 Gld-SCART 1
012 Col Fe Color Saturation adjustment
for RF input
32
013 Col AV1 Color Saturation adjustment
for Scart CVBS input
32
014 Col AV1S 32
015 Col AV2 Color Saturation adjustment
for AV CVBS input
32
016 Col AV2S Color Saturation adjustment
for for SVHS S-video input
32
017 BLOR 32
018 BLOG 32
019 RGB 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
028 MUS 0
029 PWL 8
030 CB 0
031 BPS 0
032 FCO 0
033
PeakFreqPAL443 1
034
PeakFreqPALM 1
035
PeakFreqPALN 1
036
PeakFreqNTSC443 1

1-10 (No.YA306)
037
PeakFreqNTSCM 1
038
PeakFreqSECAM 1
039 PeakFreqAV 1
040 Blackstretch 1
041 Bluestretch 0
042 Whitestretch 0
043 Transfer Rato 1
044
PeakRatioOvShot 2
045 Tint NTSC 31
046 OSO 0
047 FSL 0
048 HP2 0
049 SoftClipLevel 0
050
OP AUDIO CONFIG 2
051 OP BILING 1
052 OP HP 1
053 OP EQUAL 1
054 OP DOLBY 0
055 OP TRUSUR 0
056 OP DUB DBE 0
057 OP BBE 0
058 AVL-LEV AVL Level setting 1
059 AVL-WGT AVL Weight setting 1
060 AVL-MOD AVL Response Time setting 3
061 AVLE AVL enable/disable 1
062 LOUD-NA 5
063 LOUD-CH 1
064 BBE-CONT 7
065 BBE-PROC 7
066 OP CLIP 0
067 DEC-LEV
FM German Str. Prescale setting 23
068 MONO-LEV FM Mono Prescale setting 23
069 NIC-LEV Nicam Str. Prescale setting 17
070 ADC-AM-L AM Mono Prescale setting 21
071 ADC-AV-L Scart/Line in Prescale setting 18
072 BGSCAL DEC 0
073
BGSCAL MONO 0
074 BGSCAL NIC 0
075 BGSCAL SAP 0
076 MSCAL DEC 0
077 MSCAL
MONO
0
078 MSCAL NIC 0
079 MSCAL SAP 0
080 LSCAL DEC 0
081 LSCAL MONO 0
Item
No. Setting items Function Setting
value
082 LSCAL NIC 0
083 LSCAL SAP 0
084 E2D 0
085 FFI 0
086 CMUTE 1
087 PA-BA-VO 31
088 PA-TR-VO 15
089 PA-LM-VO 1
090 PA-ST-VO 5
091 PA-LO-VO 0
092 PA-B1-VO 21
093 PA-B2-VO 50
094 PA-B3-VO 55
095 PA-B4-VO 45
096 PA-B5-VO 34
097 PA-BA-MU 34
098 PA-TR-MU 39
099 PA-LM-MU 1
100 PA-ST-MU 5
101 PA-LO-MU 1
102 PA-B1-MU 52
103 PA-B2-MU 47
104 PA-B3-MU 29
105 PA-B4-MU 29
106 PA-B5-MU 45
107 PA-BA-TH 36
108 PA-TR-TH 34
109 PA-LM-TH 1
110 PA-ST-TH 5
111 PA-LO-TH 0
112 PA-B1-TH 47
113 PA-B2-TH 45
114 PA-B3-TH 42
115 PA-B4-TH 45
116 PA-B5-TH 42
117 AGC Speed AGC Speed setting 1
118
AGC Take over AGC setting 27
119 OIF IF Demodulator Offset 32
120 IF IF Frequency 2
121 SVO 0
122 GD 1
123 BPB 0
124 BPB2 0
125 RGB-IN 1
126 DVD1-IN 0
Item
No. Setting items Function Setting
value

(No.YA306)1-11
2.5 BASIC OPERATION OF PW SERVICE MODE
2.5.1 HOW TO ENTER THE PW SERVICE MODE
(1) Press [MENU] key.
(2) Press the [4], [7], [2] and [6] key, and PW SERVICE
MODE screen will be displayed.
2.5.2 HOW TO EXIT THE PW SERVICE MODE
Press [MENU] key to exit the PW SERVICE MODE.
2.5.3 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)
The setting value will be stored automatically when release the
REMOTE CONTROL UNIT keys.
2.5.4 PW SERVICE MODE SELECT KEY LOCATION
2.5.5 PW SERVICE MODE SETTING ITEMS
127 AV2-IN 1
128 DVD2-IN 0
129 AV1S-IN 0
130 AV1D-IN 0
131 AV2S-IN 1
132 CBVS-OUT 1
133 INCL-AV 0
134 TXT-ON 1
135 TXT-SPLIT 1
136 TXT-H-POS 11
137 TIM-REM 1
138 TIM-SLP 1
139 TIM-SW 1
140 TIM-OFF 1
141 TIM-SKP 1
142 TIM-RT 1
143 FM Radio 1
144 PWR-SAVING 1
145 PWR-PERF 3
146 PWR-REST 0
147 PWR-ONKEY 1
148 Factory Mode 0
149 CombFil Combfilter enable/disable 1
150
BlueBlackNoMute 0
151 ATS 1
152 EVG 0
153 DFL 0
154 XDT 0
155 AKB 1
156 OSVE 0
157 CL 10
158 LCD-BRT UOC Brightness 36
159 LCD-CON UOC Contrast 32
160 LCD-CON-FE RF Frontend Contrast adjust. 30
161
LCD-CON-AV1 Scart CVBS Contrast adjust. 32
162
LCD-CON-AV1S 32
163
LCD-CON-AV2 AV CVBS Contrast adjust. 32
164
LCD-CON-AV2S S-Video input Contrast adjust. 32
165 RBL 0
166 EGL 0
167 LPG 1
168 PGR UOC Red Contrast 32
169 PGG-CVBS
UOC Green Contrast for CVBS input 32
170 PGG-RGB
UOC Green Contrast for RGB input 34
171 PGB UOC Blue Contrast 32
Item
No. Setting items Function Setting
value
Setting menu Setting items
Submenu 1 UOC Hposition
ADC_Calibration
UOC_Calibration
Submenu 2 Init NVM
Initial APS
Submenu 3 Country
Language
Menu Background
Remote Control
[MENU]
[FUNCTION ]
[FUNCTION ]
Number key

1-12 (No.YA306)
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 FOOT ASSEMBLY
(1) Remove the HINGE COVER.
(2) Remove the 4 screws [A], then remove the FOOT
ASSEMBLY.
3.1.2 REMOVING THE BACK COVER
• Remove the HINGE COVER & the FOOT ASSEMBLY.
(1) Remove the SOCKET DOOR.
(2) Remove the 7 screws [B].
(3) Remove the BACK COVER toward you.
3.1.3 REMOVING THE AV JACK BRACKET
• Remove the HINGE COVER & the FOOT ASSEMBLY.
• Remove the BACK COVER.
(1) Remove the 2 screws [C].
(2) Remove the AV JACK BRACKET.
3.1.4 REMOVING THE AV JACK PWB
• Remove the HINGE COVER & the FOOT ASSEMBLY.
• Remove the BACK COVER.
• Remove the AV JACK BRACKET.
(1) Remove the 2 screws [D].
(2) Remove the AV JACK PWB.
3.1.5 REMOVING THE FRONT CONTROL PWB
• Remove the HINGE COVER & the FOOT ASSEMBLY.
• Remove the BACK COVER.
(1) Remove the 2 screws [E].
(2) Remove the FRONT CONTROL PWB with FUNCTION
BUTTON.
(3) Remove the FRONT CONTROL PWB from FUNCTION
BUTTON.
3.1.6 REMOVING THE MAIN PWB
• Remove the HINGE COVER & the FOOT ASSEMBLY.
• Remove the BACK COVER.
(1) Remove the 7 screws [F].
(2) Remove the MAIN PWB.
3.1.7 REMOVING THE INVERTER UNIT
• Remove the HINGE COVER & the FOOT ASSEMBLY.
• Remove the BACK COVER.
(1) Remove the 2 screws [G].
(2) Remove the INVERTER UNIT.
3.1.8 REMOVING THE SCART BRACKET
• Remove the HINGE COVER & the FOOT ASSEMBLY.
• Remove the BACK COVER.
(1) Remove the 2 screws [H].
(2) Remove the SCART BRACKET.
3.1.9 REMOVING THE MAIN FRAME
• Remove the HINGE COVER & the FOOT ASSEMBLY.
• Remove the BACK COVER.
• Remove the SCART BRACKET.
(1) Remove the 4 screws [J].
(2) Remove the MAIN FRAME from the FRONT PANEL.
3.1.10 REMOVING THE LCD PANEL UNIT
• Remove the HINGE COVER & the FOOT ASSEMBLY.
• Remove the BACK COVER.
• Remove the SCRAT BRACKET.
• Remove the MAIN FRAME.
(1) Remove the 4 screws [K].
(2) Sightly raise the both sides of the LCD PANEL UNIT by
hand from the MAIN FRAME.
NOTE :
• Pay special attention not to break or damage on the LCD
PANEL face or frame.
• 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 PANELslowly.
3.1.11 REMOVING THE SPEAKERS
• Remove the HINGE COVER & the FOOT ASSEMBLY.
• Remove the BACK COVER.
(1) Remove the 2 screws [L].
(2) Remove the SPEAKER from the FRONT PANEL.
(3) Follow the same when removing the other hand speaker.
3.1.12 REMOVING THE LED PWB
• Remove the HINGE COVER & the FOOT ASSEMBLY.
• Remove the BACK COVER.
(1) Remove the 2 screws [M].
(2) Remove the LED PWB from the FRONT PANEL.

(No.YA306)1-13
J
K
G
H
F
LCD PANEL
UNIT
A
(X2)
MAIN PWB
INVERTER UNIT
MAIN FRAME
SCART
BRACKET
C
D
L
B
LED PWB
AV JACK
PWB
FRONT CONTROL
PWB
FRONT PANEL
FUNCTION BUTTON
SPEAKER
SIDE AV
DOOR
SOCKET
DOOR
M
E
HANG
METAL
METAL HINGE
BRACKET
HINGE COVER
FOOT SUPPORT
FOOT ASSEMBLY
BACK
COVER
AV JACK
BRACKET
K

1-14 (No.YA306)
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 36 Step
Bright-1 26 Step
Sharpness 11 Step
Colour 39 Step
Bright-2 Med.
Colour Temp. Cool
Setting item Setting position
Volume 10 Step
Bass 16 Step
Treble 15 Step
Balance 16 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

(No.YA306)1-15
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

1-16 (No.YA306)
SECTION 4
ADJUSTMENT
This service manual does not describe ADJUSTMENT.
SECTION 5
TROUBLESHOOTING
This service manual does not describe TROUBLESHOOTING.

(No.YA306)
AV & MULTIMEDIA COMPANY 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

COPYRIGHT © 2005 Victor Company of Japan, Limited No.YA306
2005/10
WIDE LCD PANEL TELEVISION
YA306200510
LT-15B60SJ,
LT-15B60SW
SCHEMATIC DIAGRAMS
CD-ROM No.SML200510

(No.YA306)2-1
5.NOTE FOR REPAIRING SERVICE
This model's power circuit is partly different in the GND. The
difference of the GND is shown by the LIVE : ( ) side GND and the
ISOLATED(NEUTRAL): ( ) side GND. Therefore, care must be
taken for the following points.
(1)Do not touch the LIVE side GND or the LIVE side GND and the
ISOLATED(NEUTRAL)side GND simultaneously. if the above
caution is not respected, an electric shock may be caused.
Therefore, make sure that the power cord is surely removed from
the receptacle when, for example, the chassis is pulled out.
(2)Do not short between the LIVE side GND and ISOLATED(NEUTRAL)
side GND or never measure with a measuring apparatus measure
with a measuring apparatus ( oscilloscope, etc.) the LIVE side GND
and ISOLATED(NEUTRAL)side GND at the same time.
If the above precaution is not respected, a fuse or any parts will be broken.
Since the circuit diagram is a standard one, the circuit and
circuit constants may be subject to change for improvement
without any notice.
NOTE
Due improvement in performance, some part numbers show
in the circuit diagram may not agree with those indicated in
the part list.
When ordering parts, please use the numbers that appear
in the Parts List.
STANDARD CIRCUIT DIAGRAM
NOTE ON USING CIRCUIT DIAGRAMS
(7)Ground symbol
: LIVE side ground
: ISOLATED(NEUTRAL)side ground
: EARTH ground
: DIGITAL ground
(6)Connecting method
: Connector : Wrapping or soldering
: Receptacle
(5)Test point
: Test point : Only test point display
Respective voltage values are indicated
: B1
: 9V : 5V
: B2 (12V)
(4)Power Supply
Type
MM : Metalized mylar capacitor
PP : Polypropylene capacitor
MPP : Metalized polypropylene capacitor
MF : Metalized film capacitor
TF : Thin film capacitor
BP : Bipolar electrolytic capacitor
TAN : Tantalum capacitor
(3)Coils
No unit
Others
: [µH]
: As specified
No indication : Ceramic capacitor
(2)Capacitors
Capacitance value
1 or higher : [pF]
less than 1 : [µF]
Withstand voltage
No indication : DC50[V]
Others : DC withstand voltage [V]
AC indicated : AC withstand voltage [V]
Electrolytic Capacitors
47/50[Example]: Capacitance value [µF]/withstand voltage[V]
Composition resistor 1/2 [W] is specified as 1/2S or Comp.
Type
No indication : Carbon resistor
OMR : Oxide metal film resistor
MFR : Metal film resistor
MPR : Metal plate resistor
UNFR : Uninflammable resistor
FR : Fusible resistor
4.INDICATIONS ON THE CIRCUIT DIAGRAM
(1)Resistors
Resistance value
No unit : [Ω]
K: [kΩ]
M
Rated allowable power
No indication : 1/16 [W]
Others : As specified
: [MΩ]
3.INDICATION OF PARTS SYMBOL [EXAMPLE]
In the PW board : R209 R209
1.SAFETY
The components identified by the symbol and shading are
critical for safety. For continued safety replace safety ciritical
components only with manufactures recommended parts.
Since the voltage values of signal circuit vary to some extent
according to adjustments, use them as reference values.
2.SPECIFIED VOLTAGE AND WAVEFORM VALUES
The voltage and waveform values have been measured under the
following conditions.
(1)Input signal : Colour bar signal
(2)Setting positions of
each knob/button and
variable resistor
(3)Internal resistance of tester : DC 20kΩ/V
(4)Oscilloscope sweeping time : H 20µs / div
: V 5ms / div
: Othters Sweeping time is
specified
(5)Voltage values : All DC voltage values
: Original setting position
when shipped
LT-15B60SJ, LT-15B60SW

SEMICONDUCTOR SHAPES
CONTENTS
SEMICONDUCTOR SHAPES ...................................................................... 2-2
BLOCK DIAGRAM ........................................................................................2-3
CIRCUIT DIAGRAMS
MAIN PWB CIRCUIT DIAGRAM ................................................................................................................ 2-5
AV JACK PWB CIRCUIT DIAGRAM ......................................................................................................... 2-15
FRONT CONTROL PWB CIRCUIT DIAGRAM .......................................................................................... 2-16
LED PWB CIRCUIT DIAGRAM ................................................................................................................. 2-16
PATTERN DIAGRAMS
MAIN PWB PATTERN .............................................................................................................................. 2-17
AV JACK PWB PATTERN ........................................................................................................................ 2-21
FRONT CONTROL PWB PATTERN ......................................................................................................... 2-21
LED PWB PATTERN ................................................................................................................................ 2-22
USING P.W. BOARD
IC
BOTTOM VIEW FRONT VIEW TOP VIEW
1 N
N
1
OUT
E
IN
IN OUTE
1 N
TOP VIEW
1
N
1
N
CHIP IC
TRANSISTOR
BOTTOM VIEW FRONT VIEW TOP VIEW
CHIP TR
E
C
B
ECB
C
BE
B
(G)
E
(S)
C
(D)
ECB
ECB
P.W.B ASS’Y name
MAIN P.W. BOARD
FRONT CONTROL P.W. BOARD
AV JACK P.W. BOARD
LED P.W. BOARD
LT-15B60SJ LT-15B60SW
VE-20215170
VE-20214331
VE-20214317
VE-20214319
2-2(No.YA306)