C: 0.286V (p-p) (Burst signal), 75 Ω
Video 1 V (p-p), Positive (Negative sync.), 75 Ω, RCA pin jack × 3
Audio 500 mV (rms), High impedance, RCA pin jack × 6
LT-32E478/SLT-42E478/V
Contents
103 cm × 72 cm × 29.6 cm
(40-5/8" × 28-3/8" × 11-3/4") [Included stand]
103 cm × 67.2 cm × 10.8 cm
(40-5/8" × 26-1/2" × 4-3/8") [TV only]
25.1 kg (55.2 lbs) [Included stand]
23.2 kg (51 lbs) [TV only]
Design & specifications are subject to change without notice.
1-2 (No.YA512)
Page 3
SECTION 1
PRECAUTION
1.1SAFETY PRECAUTIONS
(1) The design of this product contains special hardware,
many circuits and components specially for safety
purposes. For continued protection, no changes should be
made to the original design unless authorized in writing by
the manufacturer. Replacement parts must be identical to
those used in the original circuits. Service should be
performed by qualified personnel only.
(2) Alterations of the design or circuitry of the products should
not be made. Any design alterations or additions will void
the manufacturer's warranty and will further relieve the
manufacturer of responsibility for personal injury or
property damage resulting therefrom.
(3) Many electrical and mechanical parts in the products have
special safety-related characteristics. These
characteristics are often not evident from visual inspection
nor can the protection afforded by them necessarily be
obtained by using replacement components rated for
higher voltage, wattage, etc. Replacement parts which
have these special safety characteristics are identified in
the parts list of Service manual. Electrical components
having such features are identified by shading on the
schematics and by ( ) on the parts list in Service
manual. The use of a substitute replacement which does
not have the same safety characteristics as the
recommended replacement part shown in the parts list of
Service manual may cause shock, fire, or other hazards.
(4) Don't short between the LIVE side ground and
ISOLATED (NEUTRAL) side ground or EARTH side
ground when repairing.
Some model's power circuit is partly different in the GND.
The difference of the GND is shown by the LIVE : ( ) side
GND, the ISOLATED (NEUTRAL) : ( ) side GND and
EARTH : ( ) side GND.
Don't short between the LIVE side GND and ISOLATED
(NEUTRAL) side GND or EARTH side GND and never
measure the LIVE side GND and ISOLATED (NEUTRAL)
side GND or EARTH side GND at the same time with a
measuring apparatus (oscilloscope etc.). If above note will
not be kept, a fuse or any parts will be broken.
(5) When service is required, observe the original lead dress.
Extra precaution should be given to assure correct lead
dress in the high voltage circuit area. Where a short circuit
has occurred, those components that indicate evidence of
overheating should be replaced. Always use the
manufacturer's replacement components.
(6) Isolation Check (Safety for Electrical Shock Hazard)
After re-assembling the product, always perform an
isolation check on the exposed metal parts of the cabinet
(antenna terminals, video/audio input and output terminals,
Control knobs, metal cabinet, screw heads, earphone jack,
control shafts, etc.) to be sure the product is safe to operate
without danger of electrical shock.
a) Dielectric Strength Test
The isolation between the AC primary circuit and all metal
parts exposed to the user, particularly any exposed metal
part having a return path to the chassis should withstand a
voltage of 3000V AC (r.m.s.) for a period of one second. (.
. . . Withstand a voltage of 1100V AC (r.m.s.) to an
appliance rated up to 120V, and 3000V AC (r.m.s.) to an
appliance rated 200V or more, for a period of one second.)
This method of test requires a test equipment not generally
found in the service trade.
b) Leakage Current Check
Plug the AC line cord directly into the AC outlet (do not use
a line isolation transformer during this check.). Using a
"Leakage Current Tester", measure the leakage current
from each exposed metal part of the cabinet, particularly
any exposed metal part having a return path to the chassis,
to a known good earth ground (water pipe, etc.). Any
leakage current must not exceed 0.5mA AC (r.m.s.).
However, in tropical area, this must not exceed 0.2mA AC
(r.m.s.).
Alternate Check Method
Plug the AC line cord directly into the AC outlet (do not
use a line isolation transformer during this check.). Use
an AC voltmeter having 1000Ω per 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)
0.15 F AC-TYPE
GOOD EARTH GROUND
1500 10W
PLACE THIS PROBE
ON EACH EXPOSED
ME TAL PAR T
(No.YA512)1-3
Page 4
1.2INSTALLATION
1.2.1 HEAT DISSIPATION
If the heat dissipation vent behind this unit is blocked, cooling
efficiency may deteriorate and temperature inside the unit will
rise. The temperature sensor that protects the unit will be
activated when internal temperature exceeds the pre-determined
level and power will be turned off automatically.Therefore,
please make sure pay attention not to block the heat dissipation
vent as well as the ventilation outlet behind the unit and ensure
that there is room for ventilation around it.
Ventilation hole
INPUT 1 INPUT 2
75
DIGITAL AUDIO
PHOTO VIEWER /
(VHF/UHF)
OPTICAL OUT
INPUT 3 INPUT 4 INPUT 5
S-VIDEO
Y
VIDEO
Y
COMPONENT
L
P
B
B
P
AUDIO
R
P
R
P
R
AUDIO OUT
VIDEO
VIDEO
COMPONENT
L
L
L
AUDIO
AUDIO
AUDIO
R
R
R
SERVICE
1.2.3 INSTALLATION REQUIREMENTS
To ensure safety in an emergency such as an earthquake, and
to prevent accidents, ensure that measures are taken to prevent
the TV dropping or falling over.
It fixes in a band.
TV STAND
*Diagram differs from actual appearance.
1.2.4 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.
*Diagram differs from actual appearance.
1.2.2 INSTALLATION REQUIREMENTS
Ensure that the minimal distance is maintained, as specified
below, between the unit with and the surrounding walls, as well
as the floor etc.Install the unit on stable flooring or stands.Take
precautionary measures to prevent the unit from tipping in order
to protect against accidents and earthquakes.
150 mm
200 mm
POWER
*Diagram differs from actual appearance.
150 mm
200 mm
50 mm
1-4 (No.YA512)
Page 5
1.3HANDLING LCD PANEL
1.3.1 PRECAUTIONS FOR TRANSPORTATION
When transporting the unit, pressure exerted on the internal LCD
panel due to improper handling (such as tossing and dropping)
may cause damages even when the unit is carefully packed. To
prevent accidents from occurring during transportation, pay
careful attention before delivery, such as through explaining the
handling instructions to transporters.
Ensure that the following requirements are met during
transportation, as the LCD panel of this unit is made of glass and
therefore fragile:
(1) USE A SPECIAL PACKING CASE FOR THE LCD PANEL
When transporting the LCD panel of the unit, use a special
packing case (packing materials). A special packing case
is used when a LCD panel is supplied as a service spare
part.
(2) ATTACH PROTECTION SHEET TO THE FRONT
Since the front (display part) of the panel is vulnerable,
attach the protection sheet to the front of the LCD panel
before transportation. Protection sheet is used when a LCD
panel is supplied as a service spare part.
(3) AVOID VIBRATIONS AND IMPACTS
The unit may be broken if it is toppled sideways even when
properly packed. Continuous vibration may shift the gap of
the panel, and the unit may not be able to display images
properly. Ensure that the unit is carried by at least 2
persons and pay careful attention not to exert any vibration
or impact on it.
(4) DO NOT PLACE EQUIPMENT HORIZONTALLY
Ensure that it is placed upright and not horizontally during
transportation and storage as the LCD panel is very
vulnerable to lateral impacts and may break. During
transportation, ensure that the unit is loaded along the
traveling direction of the vehicle, and avoid stacking them
on one another. For storage, ensure that they are stacked
in 2 layers or less even when placed upright.
1.3.2OPTICAL FILTER (ON THE FRONT OF THE LCD PANEL)
(1) Avoid placing the unit under direct sunlight over a
prolonged period of time. This may cause the optical filter
to deteriorate in quality and color.
(2) Clean the filter surface by wiping it softly and lightly with a
soft and lightly fuzz cloth (such as outing flannel).
(3) Do not use solvents such as benzene or thinner to wipe the
filter surface. This may cause the filter to deteriorate in
quality or the coating on the surface to come off. When
cleaning the filter, usually use the neutral detergent diluted
with water. When cleaning the dirty filter, use water-diluted
ethanol.
(4) Since the filter surface is fragile, do not scratch or hit it with
hard materials. Be careful enough not to touch the front
surface, especially when taking the unit out of the packing
case or during transportation.
1.3.3 PRECAUTIONS FOR REPLACEMENT OF EXTERIOR
PARTS
Take note of the following when replacing exterior parts (REAR
COVER, FRONT PANEL, etc.):
(1) Do not exert pressure on the front of the LCD panel (filter
surface). It may cause irregular color.
(2) Pay careful attention not to scratch or stain the front of the
LCD panel (filter surface) with hands.
(3) When replacing exterior parts, the front (LCD panel) should
be placed facing downward. Place a mat, etc. underneath
to avoid causing scratches to the front (filter surface).
(No.YA512)1-5
Page 6
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
2.1SYSTEM SETTEING
Be sure to carry out the following operation at the end of
the procedure.
(1) Set to "0 minutes" using the [SLEEP] key.
(2) While "0 minutes" is displayed, press the [V. STATUS] key
and [DISPLAY] key simultaneously, then enter the
SERVICE MODE.
(3 ) Press the [3] key (3. Diagnostics) in the SERVICE MENU
SCREEN. (Fig.1)
(4) Press the [3] key (3.Self check) in the DIAGNOSTICS
MODE screen. (Fig.2)
(5) The SELF CHECK MODE screen is displayed. (Fig.3)
(6) Turn off the power by pressing the [POWER] key on the
remote control unit.
Service Menu
1. Digital Service
2. TV-Micro Service
3. Diagnostics
4. Engineering Functions
Fig.1
Press [3] key
DIAGNOSTIC MODE SCREEN
Diagnostic
1. I2C Bus Stop
2. Status Monitor
3. Self Check
4. Version
5. USB Device Log
Fig.2
Press [3] key
SELF CHECK MODE SCREEN
2.2FEATURES
Built in ATSC (Advanced Television Systems Committee)
TUNER
This TV can receive both Digital broadcasting (ATSC) and
Analog broadcasting.
D.I.S.T. (Digital Image Scaling Technology)
This system uses line interpolation to double the number of
scanning lines and achieve high resolution, flicker-free picture.
Color Management
This function ensures dull colors are compensated to produce
natural hues.
Picture Management
This function makes it easier to see the dark areas when a
picture has many dark areas, and makes it easier to see the
bright areas when a picture has many bright areas.
Smart Picture
This function detects the APL (Average Picture Level) and
adjusts the contrast suitable for what you are watching.
DIGITAL VNR
This function cuts down the amount of noise in the original
picture.
MPEG Noise Reduction
This function effects the block noise removal and mosquito NR
simultaneously.
Sensor Effect
With Sensor Effect ON, a "leaf" icon will appear on your TV
screen when Smart Sensor brightness adjustment occurs.
2.3MAIN DIFFRENCE LIST
ITEMS
LT-32E478/SLT-42E478/V
Speaker5.0 cm × 12.0 cm,
oval type × 2
MODELS
4.0 cm × 16.0 cm,
twin oblique type × 2
ANALOG PWB ASS'Y SFN-1001A-M2SFN-1002A-M2
POWER PWB ASS'Y SFN-9001A-M2SFN-9002A-M2
DIGITAL PWB ASS'Y SFN0D001A-M2SFN0D002A-M2
Self Check -- DTM 1/2
BTSC Dec OK
Comp. ADC OK
Digital-IN OK
1-6 (No.YA512)
Previous/Next Page [BACK]Back [MENU]Exit
Fig.3
Page 7
2.4TECHNICAL INFORMATION
2.4.1 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.
2.4.1.1SPECIFICATIONS
The following table shows the specifications of this unit.
Item
LT-32E478/SLT-42E478/V
Specifications
Maximum dimensions ( W × H × D ) 76.0 cm × 45.0 cm × 4.8 cm98.3 cm × 57.6 cm × 5.2 cm
Weight7.5 kg12.6 kg
Effective screen sizeDiagonal: 80.0 cm (H: 69.8 cm × V: 39.2 cm)Diagonal: 107.3 cm (H: 93.0 cm × V: 52.3 cm)
Aspect ratio16 : 9
Drive device / systema-Si-TFT active matrix system
ResolutionHorizontally 1366 × Vertically 768 × RGB < W-XGA > 3147264 dots in total
Pixel pitch (pixel size)
Horizontally: 0.51075 mm, Vertically: 0.51075 mm Horizontally: 0.681 mm, Vertically: 0.681 mm
Displayed colour16777216 colours 256 colours for R G and B
Brightness500 cd/m
2
Contrast ratio1200 : 11500 : 1
Response time8 ms
View angleHorizontally: 178°, Vertically: 178°
Surface polarizerAnti-Glare type Low reflective coat
Panel interface systemLVDS (Low Voltage Differential Signaling)
2.4.1.2PIXEL 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 color 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 color and find out the cell that is flashing on
and off.
(No.YA512)1-7
Page 8
2.4.2 MAIN MICRO COMPUTER (CPU) FUNCTION
Pin
Pin nameI/OFunction
No.
1 NCO Not used51 ATSC_TXI Serial communication for ATSC tuner
2 SHUTDOWNO Power consumption control [Shutdown: H]52 ATSC_RXO Serial communication for ATSC tuner
3 M_MUTEO Audio output muting [Muting: H]53 NCO Not used
7 NCO Not used57 SDA0I/O I2C bus (data) for Main memory
8 NCO Not used58 SCL0I/O I
9 BL_ONO Control of Backlight [On: L]59 NCO Not used
10 UPDATEI MAIN CPU update60 NCO Not used
11 POW_LEDO
12 DIMMER_LEDO
Lighting for Power/OnTimer LED [Power ON or TIMER ON: H]
Brightness control for Power/OnTimer LED [High luminance: H]
13 NCO Not used63 NCO Not used
14 NCO Not used64 NCO Not used
15 NCO Not used65 NCO Not used
16 NCO Not used66 3.3VI +3.3V
17 3.3VI +3.3V67 NCO Not used
18 N.CO Not used68 NCO Not used
19 GND- GND69 NCO Not used
20 3.3VI Not used : Low speed oscillator70 NCO Not used
21 NCO Not used : Low speed oscillator71 NCO Not used
22 3.3VI +3.3V72 NCO Not used
23 OSCII Oscillation for system clock (16MHz)73 SBD5I/O Data on-board writing for flash memory
24 OSCOO Oscillation for system clock (16MHz)74 SBT5I Clock on-board writing for flash memory
25 3.3VI Single chip mode for CPU75 3.3VI +3.3V
26 NCO Not used76 CEC_INO Not used
27 NCO Not used77 REMOCONI Remote control
28 TU_RESETO Reset for tuner [Reset: H]78 V_SYNCO Not used : V. sync signal output
29 NCO Not used79 NCO Not used
30 NCO Not used80 POWERGOODO Not used : Power error detection [NG: H]
31 NCO Not used81 NCO Not used
32 HP_DETO Not used: Headphone detection82 RSTI CPU reset [Reset: L]
33 HP_MUTEO Not used: Headphone output muting83 3.3VI +3.3V
34 3.3VI +3.3V84 SCL1I/O I
35 P_MUTEO Picture muting [Muting: H]85 SDA1I/O I
36 PFC_POWO PFC power control [Power on: L]86 SCL2I/O Not used
37 NCO B1 over current protect detection [Protection: H]87 SDA2I/O Not used
38 LCD_POWO Panel power control [Power on: L]88 NCO Not used
39 LOB_PROI Low-B protect detection [Protection: H]89 NCO Not used
40 MECA_SWI Machine SW interrupt detection [SW Pushing: L]90 NCO Not used
41 MAIN_POWO Main power control [Power on: L] 91 I2C_STOPO Not used
42 LB_POWO Low-B power control [Power on: L]92 GND- GND
43 0VI Reference voltage [GND Fixed]93 CEC_OUTO Not used
44 EEO Not used: EE sensor94 NCO Not used
45 NCO Not used95 NCO Not used
46 KEY2I Front key scan voltage (VOL+/- INPUT)96 NCO Not used
47 KEY1I Front key scan voltage (CH+/- MENU)97 NCO Not used
48 NCO Not used98 NCO Not used
49 NCO Not used99 NCO Not used
50 AC_INI AC 50/60Hz for timer clock100 JCC5057_BUSYI
Pin
No.
Pin nameI/OFunction
Not used : Serial communication for convergence control
Not used : Serial communication for convergence control
2
C bus (clock) for Main memory
61 GND- GND
62 DIGI_PHOTI Photo sensor for DIGITAL-IN illegal copy protection
2
C bus (clock) for RGB & DEF PROCESS
2
C bus (data) for RGB & DEF PROCESS
Busy for Colour management / OSD composition [Busy: H]
1-8 (No.YA512)
Page 9
SECTION 3
DISASSEMBLY
3.1CAUTION AT DISASSEMBLY
• Be sure to perform the SYSTEM SETTEING, at the end of the procedure.
• Make sure that the power cord is disconnected from the outlet.
• Pay special attention not to break or damage the parts.
• Make sure that there is no bent or stain on the connectors before inserting, and firmly insert the connectors.
REFERENCE:
When removing each board, remove the connector if necessary. The operation is easier if you write down the connection points
(connector numbers) of the connector. For connection of each board, refer to the "WIRING DIAGRAM" of the Standard Circuit
Diagram.
3.2DISASSEMBLY PROCEDURE [LT-32E478/S]
3.2.1 REMOVING THE REAR COVER (Fig.1)
(1) Remove the 1 screw [A].
(2) Remove the CORD CLAMP.
(3) Remove the 6 screws [B], the 2 screws [C], the 4 screws
[D] and the 3 screws [E].
(4) Remove the REAR COVER.
3.2.2 REMOVING THE STAND ASS’Y (Fig.1)
• Remove the CORD CLAMP
(1) Remove the 4 screws [F].
(2) Remove the STAND ASS’Y in the direction of the arrow.
3.2.3 REMOVING THE POWER PWB (Fig.1)
• Remove the REAR COVER.
(1) Remove the 1 screw [G].
(2) Remove the POWER CORD HOLDER.
(3) Remove the POWER CORD.
(4) Remove the 5 screws [H].
(5) Remove the POWER PWB.
3.2.4 REMOVING THE ANALOG PWB (Fig.1)
• Remove the REAR COVER.
(1) Remove the 6 screws [I].
(2) Remove the ANALOG PWB.
3.2.5 REMOVING THE DIGITAL PWB (Fig.1)
• Remove the REAR COVER.
(1) Remove the 1 screw [J].
(2) Remove the DIGITAL BASE.
(3) Remove the SHIELD COVER.
(4) Remove the 2 screws [K] and 5 screws [L].
(5) Remove the DIGITAL PWB.
(6) Remove the 3 screws [M].
(7) Remove the SHIELD BASE.
CAUTION :
Make sure to perform the "SYSTEM SETTEING", when
DIGITAL PWB is replaced.
3.2.7 REMOVING THE LED PWB (Fig.1)
• Remove the REAR COVER.
• Remove the STAND ASS’Y.
(1) Remove the 2 screw [P].
(2) Remove the STAND BASE COVER.
(3) Remove the 2 screws [Q] and 1 screw [R].
(4) Remove the STAND BASE.
(5) Remove the 2 screws [S] and 2 hooks [a].
(6) Remove the LED PWB.
3.2.8 REMOVING THE SPEAKER HOLDER AND SPEAKER
(Fig.1)
• Remove the REAR COVER.
• Remove the STAND ASS’Y.
• Remove the STAND BASE COVER.
(1) Remove the 4 screws [T].
(2) Remove the SPEKAER.
(3) Remove the 3 screws [U].
(4) Remove the SPEKAER HOLDER.
(5) Follow the same steps when removing the other hand
SPEAKER HOLDER and SPEAKER.
3.2.9 REMOVING THE LCD PANEL UNIT (Fig.1)
• Remove the STAND.
• Remove the REAR COVER.
• Remove the STAND ASS’Y.
• Remove the STAND BASE COVER.
• Remove the STAND BASE.
• Remove the POWER CORD HOLDER.
• Remove the SPEKAER HOLDER.
(1) Remove the 6 screws [V].
(2) Remove the 4 screws [W].
(3) Remove the MAIN BASE.
(4) Remove the LCD PANEL UNIT from the FRONT PANEL.
3.2.6 REMOVING THE SW PWB (Fig.2)
• Remove the REAR COVER.
(1) Remove the 2 screws [N].
(2) Remove the SW PWB.
(3) Remove the 2 screws [O].
(4) Remove the CONTROL KNOB.
(No.YA512)1-9
Page 10
C
D
B
E
F
D
B
P
A
STAND BASE COVER
CORD CLAMP
V
SHIELD COVER
L
M
W
DIGITAL PWB
SHIELD
BASE
J
STAND ASS'Y
I
REAR COVER
H
ANALOG PWB
POWER PWB
K
V
W
MAIN BASE
W
LCD PANEL UNIT
W
V
POWER CORD
DIGITAL
BASE
G
R
STAND BASE
Q
CONTROL SW PWB
CONTROL KNOB
1-10 (No.YA512)
POWER CORD
HOLDER
FRONT PANEL
SPEAKER
U
T
S
SPEAKER
SPACER
T
N
O
O
LED PWB
U
U
U
SPACER
SPEAKER HOLDER
a
SPACER
SPEAKER HOLDER
SPACER
Fig.1
Page 11
3.3DISASSEMBLY PROCEDURE [LT-42E478/V]
3.3.1 REMOVING THE REAR COVER (Fig.2)
(1) Remove the 1 screw [A].
(2) Remove the CORD CLAMP.
(3) Remove the 12 screws [B], the 3 screws [C], and the 4
screws [D].
(4) Remove the REAR COVER.
3.3.2 REMOVING THE STAND ASS’Y (Fig.2)
• Remove the CORD CLAMP
(1) Remove the 4 screws [E].
(2) Remove the STAND ASS’Y in the direction of the arrow.
3.3.3 REMOVING THE POWER PWB (Fig.2)
• Remove the REAR COVER.
(1) Remove the 1 screw [F].
(2) Remove the POWER CORD HOLDER.
(3) Remove the POWER CORD.
(4) Remove the 10 screws [G].
(5) Remove thePOWER PWB.
3.3.4 REMOVING THE ANALOG PWB (Fig.2)
• Remove the REAR COVER.
(1) Remove the 6 screws [H].
(2) Remove the ANALOG PWB.
3.3.5 REMOVING THE DIGITAL PWB (Fig.2)
• Remove the REAR COVER.
(1) Remove the 1 screw [I].
(2) Remove the DIGITAL BASE.
(3) Remove the SHIELD COVER.
(4) Remove the 2 screws [J] and 5 screws [K].
(5) Remove the DIGITAL PWB.
(6) Remove the 3 screws [L].
(7) Remove the SHIELD BASE.
CAUTION :
Make sure to perform the "SYSTEM SETTEING", when
DIGITAL PWB is replaced.
3.3.7 REMOVING THE LED PWB (Fig.2)
• Remove the STAND ASS’Y.
• Remove the REAR COVER.
(1) Remove the 2 screw [P].
(2) Remove the STAND BASE COVER.
(3) Remove the 2 screws [Q] and 3 screws [R].
(4) Remove the STAND BASE.
(5) Remove the 2 hooks [a].
(6) Remove the LED PWB.
3.3.8 REMOVING THE SPEAKER (Fig.2)
• Remove the STAND ASS’Y.
• Remove the REAR COVER.
• Remove the STAND BASE COVER.
• Remove the STAND BASE.
(1) Remove the 3 screws [S].
(2) Remove the SPEKAER.
(3) Follow the same steps when removing the other hand
SPEAKER.
NOTE
When the SPEAKER is decomposed, the performance cannot
be kept.
3.3.9 REMOVING THE LCD PANEL UNIT (Fig.2)
• Remove the STAND.
• Remove the REAR COVER.
• Remove the STAND ASS’Y.
• Remove the STAND BASE COVER.
• Remove the STAND BASE.
• Remove the SPEKAER.
(1) Remove the 8 screws [T].
(2) Remove the 4 screws [U].
(3) Remove the MAIN BASE.
(4) Remove the LCD PANEL UNIT from the FRONT PANEL.
3.3.6 REMOVING THE SW PWB (Fig.2)
• Remove the REAR COVER.
(1) Remove the 2 screws [M].
(2) Remove the SW PWB.
(3) Remove the 2 screws [N].
(4) Remove the CONTROL KNOB.
(No.YA512)1-11
Page 12
C
D
POWER PWB
G
MAIN BASE
D
E
B
C
P
A
STAND BASE COVER
H
SHIELD COVER
REAR COVER
ANALOG PWB
T
U
K
L
D
CORD CLAMP
DIGITAL PWB
SHIELD
BASE
I
STAND ASS'Y
U
J
R
Q
STAND BASE
POWER CORD
T
DIGITAL
BASE
POWER CORD
HOLDER
F
1-12 (No.YA512)
CONTROL SW PWB
M
N
CONTROL KNOB
LCD PANEL UNIT
FRONT PANEL
LED PWB
S
S
S
a
SPEAKER
S
N
SPEAKER
Fig.2
Page 13
3.4MEMORY 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.
3.4.1 MEMORY IC TABLE
Simbol Number of pins Mounting PWBMain content of data
IC6002
IC7002
32-pinDIGITAL PWBProgram of IC6001(Video process) is memorized.
8-pinANALOG PWBSetting value of IC7001(MAIN CPU) is memorized.
3.4.2 MEMORY IC REPLACEMENT PROCEDURE
1. Power off
Switch off the power and disconnect the power plug.
2. Replace the memory IC
Be sure to use a memory IC written with the initial setting data.
3. Power on
Connect the power cord to the wall outlet and switch on the
power.
4. Receiving channel setting
Refer to the OPERATING INSTRUCTIONS (USER'S GUIDE)
and set the receive channels (Channels Preset) as described.
5. User settings
Check the user setting items according to the "FACTORY
SETTING ITEM" table.
Where these do not agree, refer to the OPERATING
INSTRUCTIONS (USER'S GUIDE) and set the items as
described.
6. SERVICE MODE setting
Verify what to set in the SERVICE MODE, and set whatever is
necessary(Fig.1) .
Refer to the SERVICE ADJUSTMENT for setting.
3.4.3 SERVICE MODE SETTING ITEMS
SERVICE MODE
Service Menu
1. Digital Service
2. TV-Micro Service
3. Diagnostics
4. Engineering Functions
DIGITAL SERVICE MODE
Digital Service
1. Adjust
2. Memory Edit
3. Xilleon Register Edit
4. ---
5. Select Channel Map
6. Clear Channel Map
7. Digital Tunig Test
Press [2] key
TV-MICRO SERVICE MODE
TV-Micro Service
1. Adjust
2. Memory Edit
Press [1] key
Fig.1
Setting itemsSettingsItem No.
1. Digital Service
Audio syetem setting-1AdjustA001 - A008
Micom setting
Fixed
C001 - C032
X001 - X133
S029 - S149
2. TV-Micro Service
Video syetem settingAdjustS001 - S008
Audio syetem setting-2FixedA001 - A005
Factory syetem settingFixedF001
(No.YA512)1-13
Page 14
3.4.4 SETTINGS OF FACTORY SHIPMENT
3.4.4.1BUTTON OPERATION3.4.4.2REMOTE CONTROL DIRECT OPERATION
Setting itemSetting position
POWEROff
CHANNELCABLE-02
VOLUME10
INPUTTV
3.4.4.3REMOTE CONTROL MENU OPERATION
PICTURE ADJUST
Customers can adjust the picture setting of menu screen as their own like but the picture standard value during factory shipment is as below.
< NTSC MODE >
Setting item
Tint00000000
Color00+6+60000
Picture0 0+10+100 0-10-10
Bright00000000
Detail00+1+10000
Energy Saver Mode+20+15+30+30-10-2000
Color TemperatureLOWLOWHIGHHIGHHIGHHIGHHIGHHIGH
Color ManagementONONONONONONONON
Dynamic Gamma ONONONONONONONON
Noise ReductionLOWLOWLOWLOWLOWLOWLOWLOW
Natural CinemaAUTOAUTOAUTOAUTOAUTOAUTOAUTOAUTO
Position AdjustmentCenterCenterCenterCenterCenterCenterCenterCenter
(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.
3.5.2 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.
3.5.3 REPLACEMENT STEPS
1. How to remove Chip parts
2. How to install 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.
SOLDER
SOLDER
[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 A as indicated in the figure.
(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.
1-16 (No.YA512)
A
B
C
(4) Then solder leads B and C.
A
B
C
Page 17
SECTION 4
ADJUSTMENT
4.1ADJUSTMENT PREPARATION
(1) This TV is adjusted by using REMOTE CONTROL UNIT.
(2) The 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.
(3) Make sure that connection is correctly made AC to AC
power source.
(4) Turn on the power of the TV and measuring instruments for
warming up for at least 30 minutes before starting
adjustments.
(5) If the receive or input signal is not specified, use the most
appropriate signal for adjustment.
(6) Never touch the parts (such as variable resistors,
transformers and condensers) not shown in the adjustment
items of this service adjustment.
4.2PRESET SETTING BEFORE ADJUSTMENTS
Unless otherwise specified in the adjustment items, preset the
following functions with the REMOTE CONTROL UNIT.
Setting itemSettings
VIDEO STATUSSTANDARD
BRIGHT / CONTRAST / COLOR / TINT
00
COLOR TEMPERATURELOW
COLOR MANAGEMENTON
NATURAL CINEMAOFF
TREBLE / BASS / BALANCE00
SMART SOUNDOFF
MTSSTEREO
A.H.S.OFF
ASPECTFULL
4.3MEASURING INSTRUMENT AND FIXTURES
• Signal generator (Pattern generator) [NTSC]
• TV audio multiplex signal generator
• Remote control unit
4.4ADJUSTMENT ITEMS
VIDEO CIRCUIT [2. TV-Micro Service]
• WHITE BALANCE (HIGHLIGHT) adjustment
MTS CIRCUIT [1. Digital Service]
• MTS INPUT LEVEL adjustment
• MTS SEPARATION adjustment
4.5SERVICE MODE
4.5.1 BASIC OPERATION OF SERVICE MODE
Operate the SERVICE MODE with the REMOTE CONTROL
UNIT.
4.5.1.1HOW TO ENTER THE SERVICE MODE
(1) Set to "0 minutes" using the [SLEEP] key.
(2) While "0 minutes" is displayed, press the [V. STATUS]
key and [DISPLAY] key simultaneously.
(3) Enter the SERVICE MODE (Fig.1)
SERVICE MENU SCREEN
Service Menu
1. Digital Service
2. TV-Micro Service
3. Diagnostics
4. Engineering Functions
Fig.1
4.5.1.2HOW TO EXIT THE SERVICE MODE
Press the [MENU] key to exit the SERVICE MODE.
4.5.1.3HOW TO STORE OF SETTING VALUE
When adjustment is completed, press the [MUTING] key to
memorize the adjustment value.
NOTE:
If not to do it, adjustment data is not memorized to the memory
IC. And if exit the adjustment mode before memorize the data,
the adjustment value which you change is canceled.
4.5.1.4SERVICE MODE SELECT KEY LOCATION
[V. STATUS]
POWER
3
6
9
VOL
V5
+
[POWER]
[NUMBER]
[CH+]
[VOL+][VOL-]
[CH-]
[BACK]
[SLLEP]
[MUTING]
[DISPLAY]
[MENU]
SLEEP SUB CH V.STATUS SOUND
1
2
4
5
7
8
TUNERETURN+/TV
0
V1V4V2V3
MUTING
CH+
VOL
FAV.
-
CH-
ML/MTS DISPLAY C.C. ASPECT
MENUBACK GUIDE
OK
RM-C1291
TV
(No.YA512)1-17
Page 18
4.5.2 SERVICE MODE MENU FLOW CHART
Service Menu SCREEN
Service Menu
1. Digital Service
2. TV-Micro Service
3. Diagnostics
4. Engineering Functions
DO NOT ADJUST
Press [1] keyPress [2] key
1. Digital Service SCREEN
Digital Service
1. Adjust
2. Memory Edit
3. Xilleon Register Edit
4. ---
5. Select Channel Map
6. Clear Channel Map
7. Digital Tunig Test
Press [1] key
DO NOT ADJUST
1. Adjust SCREEN
A001 IN LEVEL 7
NTSC 43Full Standard L
Press [3] key
2. TV-Micro Service SCREEN
TV-Micro Service
1. Adjust
2. Memory Edit
DO NOT ADJUST
Press [1] key
1. Adjust SCREEN
S001 PREPARE 00
NTSC 43Full STD L
1-18 (No.YA512)
3. Diagnostic SCREEN
Diagnostic
1. I2C Bus Stop
2. Status Monitor
3. Self Check
4. Version
5. USB Device Log
[Refer to SECTION 5]
Page 19
4.5.3 DESCRIPTION OF STATUS DISPLAY
The status display on the upper part of the SERVICE MODE screen is common (to all models).
4.5.3.1DIGITAL SERVICE MODE
1. Adjust
(4) WHITE BALANCE
State of the WHITE BALANCE is displayed.
SETTING ITEM No.
SETTING ITEM NAME
SETTING VALUE (DATA)
H: HIGH
L: LOW
A001 IN LEVEL 7
NTSC 43Full Standard L
(5) SETTING ITEM NAME
Setting item name are displayed. For the setting item names
to be displayed, refer to "INITIAL SETTING VALUE OF
SERVICE MODE".
(6) SETTING ITEM NO.
Setting item numbers are displayed. The setting item numbers
to be displayed are listed below.
STD: STANDARD
DYN: DYNAMIC
THEA: THEATER
GAME: GAME
(4) WHITE BALANCE
It is similar to DIGITAL SERVICE MODE.
(5) SETTING ITEM NAME
Setting item name are displayed. For the setting item names
to be displayed, refer to "INITIAL SETTING VALUE OF
SERVICE MODE".
• [SLEEP] key.
Switch to the next items.
(7) SETTING VALUE (DATA)
It is similar to DIGITAL SERVICE MODE.
2. Memory Edit
Data in the EEPROM is edited on this screen. [Do not adjust]
CAUTION:
This mode is not used in the ADJUSTMENT. Press the
[BACK] key to return to the SERVICE MENU SCREEN.
1-20 (No.YA512)
Page 21
4.6INITIAL SETTING VALUE OF SERVICE MODE
• Perform fine-tuning based on the "initial values" using the remote control when in the Service mode.
• The "initial values" serve only as an indication rough standard and therefore the values with which optimal display can be achieved
may be different from the default values.
• Never change the values of the items( ) that are not described in ADJUSTMENT PROCEDURE or in the below table as they
are fixed values.
4.6.1 [1. Digital Service]
4.6.1.1AUDIO SETTING-1
No.Setting itemVariable range
A001IN LEVEL0 - 1578
A002LOW SEP0 - 632523
A003HIGH SEP0 - 632933
A004DAC CNTL 10 - FFFF
A005DAC CNTL 20 - FF22
A006DAC CNTL 30 - FF00
A007DAC ATT L00 - FFFFFF
A008DAC ATT R00 - FFFFFF
4.6.2 [2. TV-Micro Service]
4.6.2.1VIDEO SETTING
No.Setting itemVariable range
S001PREPARE00 - FF0000
S002R DRIVE0 - 255137137
S003G DRIVE0 - 255137137
S004B DRIVE0 - 255137137
S005ADDR H00 - FF0000
S006ADDR L00 - FF0000
S007DATA H00 - FF0000
S008DATA L00 - FF0000
Initial setting value
LT-32E478/SLT-42E478/V
Initial setting value
LT-32E478/SLT-42E478/V
4.6.2.2AUDIO SETTING-2
No.Setting itemVariable range
A001BASS OFS-128 - +12755
A002TREB OFS-128 - +12745
A003AGC FLAT0 - 311
A004MOVIEOFS-128 - +12700
A005MUSICOFS-128 - +12700
4.6.2.3FACTRY SETTING
No.Setting itemVariable range
F01DTVM RST0 - 111
Initial setting value
LT-32E478/SLT-42E478/V
Initial setting value
LT-32E478/SLT-42E478/V
(No.YA512)1-21
Page 22
4.7ADJUSTMENT PROCEDURE
4.7.1 VIDEO CIRCUIT [2. TV-Micro Service]
Item
WHITE
BALANCE
Measuring
instrument
Remote
control unit
Test pointAdjustment partDescription
(HIGHLIGHT)
Signal
generator
[1.Adjust]
S002: R DRIVE (Red drive)
S003: G DRIVE (Green drive)
S004: B DRIVE (Blue drive)
(1) Receive a NTSC 75% all white signal.
(2) Set "VIDEO STATUS" to "STANDARD".
(3) Set "ASPECT" to "FULL".
(4) Select "COLOR TEMPERATURE" to "LOW".
(5) Select the 2. TV-Micro Service from the
SERVICE MENU.
(6) Select the 1.Adjust.
(7) Adjust to keep one of <S002> (Red drive),
<S003> (Green drive) or <S004> (Blue drive)
unchanged, then lower the other two so that the
all-white screen is equally white throughout.
NOTE:
Set one or more of <S002>, <S003> and
<S004> to "137".
(8) Check that white balance is properly tracked
from low light to high light. If the white balance
tracking is deviated, adjust to correct it.
(9) Press the [MUTING] key to memoirze the set
value.
4.7.2 MTS CIRCUIT [1. Digital Service]
Item
MTS INPUT
LEVEL
MTS
SEPARATION
Measuring
instrument
Remote
control unit
TV audio
multiplex
signal
Test pointAdjustment partDescription
R OUT
L OUT
[AUDIO OUT]
generator
Oscilloscope
Remote
control unit
L-Channel
signal waveform
1 cycle
[1.Adjust]
A001: IN LEVEL
[1.Adjust]
A002: LOW SEP
A003: HIGH SEP
R-Channel
crosstalk portion
Minimum
(1) Receive any broadcast.
(2) Select the 1.Digital Service from the
SERVICE MENU.
(3) Select the 1.Adjust.
(4) Select the <A001> (IN LEVEL).
(5) Set the initial setting value of <A001>.
(6) Press the [MUTING] key to memorize the set
value.
(1) Input the stereo L signal (300 Hz) from the TV
audio multiplex signal generator to the antenna
terminal.
(2) Connect an oscilloscope to R OUT pin of the
AUDIO OUT, and display one cycle portion of
the 300 Hz signal.
(3) Select the 1.Digital Service from the
SERVICE MODE.
(4) Select the 1.Adjust.
(5) Select the <A002> (LOW SEP).
(6) Set the initial setting value of <A002>.
(7) Adjust the <A002> so that the stroke element
of the 300Hz signal will become minimum.
(8) Press the [MUTING] key to memorize the set
value.
(9) Input the stereo R signal (3kHz) and change
the connection of the oscilloscope to L OUT pin
of the AUDIO OUT.
(10) Similarly adjust <A003> (HIGH SEP).
(11) Press the [MUTING] key to memorize the set
value.
1-22 (No.YA512)
Page 23
SECTION 5
TROUBLESHOOTING
5.1SELF CHECK FEATURE
5.1.1 OUTLINE
This unit comes with the "Self check" feature, which checks the
operational state of the circuit and displays/saves it during
failure. Diagnosis is performed when power is turned on, and
information input to the main microcomputer is monitored at all
time. Failure detection is based on input state of I
various control lines connected to the main microcomputer.
5.1.2 HOW TO ENTER THE SELF CHECK MODE
(1) Set to "0 minutes" using the [SLEEP] key.
(2) While "0 minutes" is displayed, press the [V. STATUS] key
and [DISPLAY] key simultaneously, then enter the SERVICE
MODE.
(3) Press the [3] key (3.Diagnostics) in the SERVICE MODE
SCREEN. (Fig.1)
(4) Press the [3] key (3.Self check) in the DIAGNOSTICS
MODE screen. (Fig.2)
(5) The SELF CHECK MODE screen is displayed. (Fig.3)
(6) Press the [VOL+] / [VOL-] key to switch between the first
page and the second page.
NOTE:
When a number key other than the [3] key is pressed in
the SERVICE MODE SCREEN, the other relevant
screen may be displayed.
This is not used in the SELF CHECK MODE. Press the
[BACK] key to return to the SERVICE MENU SCREEN.
2
C bus and the
SERVICE MODE SCREEN
Service Menu
1. Digital Service
2. TV-Micro Service
3. Diagnostics
4. Engineering Functions
Fig.1
Press [3] key
DIAGNOSTIC MODE SCREEN
Diagnostic
1. I2C Bus Stop
2. Status Monitor
3. Self Check
4. Version
5. USB Device Log
Fig.2
Press [3] key
5.1.3 HOW TO EXIT THE SELF CHECK MODE
TO SAVE FAILURE HISTORY:
Turn off the power by unplugging the AC power cord plug
when in the SELF CHECK MODE.
TO CLEAR (RESET) FAILURE HISTORY:
Turn off the power by pressing the key on the remote control
unit when in the SELF CHECK MODE.
5.1.4 FAILURE HISTORY
Failure history can be counted up to 9 times for each item. When
the number exceeds 9, display will remain as 9. Failure history
will be stored in the memory unless it has been deleted.
5.1.5 POINTS TO NOTE WHEN USING THE SELF CHECK
FEATURE
In addition to circuit failures (abnormal operation), the following
cases may also be diagnosed as "Abnormal" and displayed and
counted as "NG".
(1) Temporary defective transmissions across circuits due to
pulse interruptions
(2) Misalignment in the on/off timing of power for I
2
C bus
(VCC) when turning on/off the main power.
Diagnosis may be impeded if a large number of items are
displayed as "NG". As such, start Self check check only after 3
seconds in the case of receivers and 5 seconds in the case of
panels upon turning on the power. If recurrences are expected,
ensure to clear (reset) the failure history and record the new
diagnostic reults.
SELF CHECK MODE SCREEN (Page 1)
Self Check -- DTM 1/2
BTSC Dec OK
Comp. ADC NG 2
Digital-IN OK
Item
Failure history
Previous/Next Page [BACK]Back [MENU]Exit
CHECK
Normality=OK
Abnormality=NG
Press [VOL+] / [VOL-] key
SELF CHECK MODE SCREEN (Page 2)
Self Check -- TVM 2/2
Item
LOB NG 2 RGB OK
TIM OK A-EEPROM OK
PHOTO NG 3
HostLink OK
AUDIO OK
Previous/Next Page [BACK]Back [MENU]Exit
CHECK
Normality=OK
Abnormality=NG
Failure history
Fig.3
(No.YA512)1-23
Page 24
5.1.6 DETAILS
Self check is performed for the following items:
<Page 1 of screen>
Detection itemDisplayDetection content
MTS decoderBTSC Dec Confirmation of reply of ACK signal which
2
C communication.
uses I
[DIGITAL PWB]
IC2101
Diagnosis
signal (line)
Detection timing
SDAIf it checks whenever I
communication is performed and no
reply of ACK signal an error will be
counted.
A-D converter for
component video
Digital inputDigital-INConfirmation of reply of ACK signal which
Comp.ADC Confirmation of reply of ACK signal which
2
C communication.
uses I
[DIGITAL PWB]
IC4001
2
uses I
C communication.
SDASame as above.
SDASame as above.
<Page 2 of screen>
Detection itemDisplayDetection content
Low bias line short
protection
LOB[LT-32E478/S]
Operation of low B short(5V/24V)
protection circuit.
5V: Q9601
24V: IC9501
, Q9651[ANALOG PWB]
[ANALOG PWB]
Diagnosis
signal (line)
Detection timing
LB_PROAt about 3 seconds after the power is
turned on, the self-check function starts.
If NG is detected during 3s, the power is
turned off automatically.
[LT-42E478/V]
Operation of low B short(5V/9V12V/14V/
24V) protection circuit.
5V: Q9601
power is turned on. Periodically check
the power frequency by counting the AC
pulse and monitor whether or not the
frequency is changed.
Photo detectPHOTOOperation of the photo sensor.DIGI_PHOT At about 3 seconds after the power is
turned on, the self-check function starts.
If NG is detected during 250ms,
irregularly is counted.
Digital tuner CPU
and main CPU
communication
Audio processAUDIOConfirmation of reply of ACK signal which
HostlinkCommunication error between the digital
tuner CPU and the main CPU is detected.
CN1FFC
uses I
IC6601
[ANALOG PWB]
2
C communication.
[ANALOG PWB]
ATSC_TX Check communication errors by
counting the number of reset exception
handling.
SDAIf it checks whenever I
communication is performed and no
reply of ACK signal an error will be
counted.
LCD driveRGBConfirmation of reply of ACK signal which
MemoryA-EEPROM Confirmation of reply of ACK signal which
2
C communication.
uses I
[DIGITAL PWB]
IC6001
2
uses I
C communication.
SDASame as above.
SDASame as above.
IC7002[ANALOG PWB]
2
C
2
C
1-24 (No.YA512)
Page 25
5.1.7 DISPLAY METHOD WHEN RASTER IS NOT AVAILABLE
The self check results are shown on the following POWER LED display. When the raster is not displayed, each failure is shown by
turning LED on and off at the specified intervals.
• For Low B short protection, the power of the TV is turned off when NG is detected. Immediately after the power is turned off, the
POWER LED will be turning on and off. When the power is turned off, you cannot turn the power on again until the AC plug is taken
out and put in again.
ItemPOWER LED ON / OFF intervals
Low B short protectionTurning on and off at 2-second intervals
(No.YA512)1-25
Page 26
Victor company of Japan, Limited
Display category 12, 3-chome, Moriya-cho, Kanagawa-ku, Yokohama-city, Kanagawa-prefecture, 221-8528, Japan
(No.YA512)
Printed in Japan
VPT
Loading...
+ hidden pages
You need points to download manuals.
1 point = 1 manual.
You can buy points or you can get point for every manual you upload.