JVC JVC LT32E478, LT32E478/S, LT32E478S, LT37E478/V, LT42E478, LT42E478/V, LT42E478S Service manual & schematics

Page 1
SERVICE MANUAL
YA51220073SERVICE MANUAL
LCD FLAT TELEVISION
LT-32E478/S, LT-42E478
POWER
SLEEP SUB CH V.STATUS SOUND
1
2
3
4
5
6
7
8
9
TUNE RETURN+/TV
0
V1 V4V2 V3
MUTING
V5
CH+
VOLÐVOL
FAV.
+
CHÐ
ML/MTS DISPLAY C.C. ASPECT
MENU BACK GUIDE
OK
RM-C1291
TV
COPYRIGHT © 2007 Victor Company of Japan, Limited
BASIC CHASSIS
FN
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-23
COPYRIGHT © 2007 Victor Company of Japan, Limited
No.YA512
2007/4
Page 2
SPECIFICATION
Items
Dimensions ( W × H × D ) 80 cm × 59.3 cm × 23 cm
Mass 14.3 kg (31.5 lbs) [Included stand]
Power Input AC120 V , 60 Hz
Power Consumption 159 W (Max) 228 W (Max)
TV RF System (Analog / Digital)
Color System (Analog) NTSC
Stereo System (Analog) BTSC (Multi Channel Sound)
Teletext System (Analog) Closed caption (T1-T4 / CC1-CC4)
TV Receiving Channels and Frequency (Analog)
TV / CATV Total Channel 191 Channels
Intermediate Frequency (Analog)
Color Sub Carrier Frequency (Analog) 3.58 MHz
LCD panel 32V-inch wide aspect (16:9) 42V-inch wide aspect (16:9)
Screen Size
Display Pixels Horizontal : 1366 dots × Vertical : 768 dots (W-XGA)
Audio Power Output 10 W + 10 W
Speaker 5.0 cm × 12.0 cm, oval type × 2 4.0 cm × 16.0 cm, twin oblique type × 2
Antenna Terminal (VHF/UHF, ATSC / DIGITAL CABLE IN)
Digital input [DIGITAL-IN 1/2]
Video / Audio input [INPUT-3/4/5]
Audio output (Fix) 500 mV (rms), Low impedance, RCA pin jack × 2 Digital Audio Optical Output Digital SPDIF × 1 Photo Viewer / Service USB connector × 1 Remote Control Unit RM-C1291 (AA/R6 / UM-3 battery × 2)
Component Video
750p / 525p / 525i
VHF Low
VHF High
Video IF
Sound IF
VIDEO/AUDIO HDMI 2-row 19pin connector × 2
[INPUT-3/4]
S-Video
[INPUT-3]
(31-1/2" × 23-3/8" × 9-1/8") [Included stand] 80 cm × 54.5 cm × 9.9 cm (31-1/2" × 21-1/2" × 4") [TV only]
13.5 kg (29.7 lbs) [TV only]
Analog
CCIR (M)
Digital
ATSC terrestrial / Digital cable
02 ch - 06 ch : 54 MHz - 88 MHz 07 ch - 13 ch : 174 MHz - 216 MHz
UHF
14 ch - 69 ch : 470 MHz - 806 MHz
CATV
54 MHz - 804 MHz Low Band : 02 - 06 High Band : 07 - 13 Mid Band : 14 - 22 Super Band : 23 - 36 Hyper Band : 37 - 64 Ultra Band : 65 - 94, 100 - 135 Sub Mid Band : 01, 96 - 99
45.75 MHz
41.25 MHz (4.5 MHz)
Diagonal: 80.3 cm (H: 69.8 cm × V: 39.2 cm) Diagonal: 106.7 cm (H: 93.5 cm × V: 52.8 cm)
F-type connector, 75 unbalanced, coaxial × 1
(Digital-input terminal is not compatible with picture signals of personal computer)
RCA pin jack × 6
1125i
Y : 1 V (p-p) (Sync signal: 0.35V(p-p), 3-value sync.), 75 Pb/Pr : ±0.35V(p-p), 75 Y : 1 V (p-p), Positive (Negative sync.), 75 Cb/Cr : 0.7V(p-p), 75
Mini-DIN 4 pin × 1 Y: 1 V (p-p), Positive (Negative sync.), 75
C: 0.286V (p-p) (Burst signal), 75 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/S LT-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

1.1 SAFETY PRECAUTIONS

(1) The design of this product contains special hardware,
many circuits and components specially for safety purposes. For continued protection, no changes should be made to the original design unless authorized in writing by the manufacturer. Replacement parts must be identical to those used in the original circuits. Service should be performed by qualified personnel only.
(2) Alterations of the design or circuitry of the products should
not be made. Any design alterations or additions will void the manufacturer's warranty and will further relieve the manufacturer of responsibility for personal injury or property damage resulting therefrom.
(3) Many electrical and mechanical parts in the products have
special safety-related characteristics. These characteristics are often not evident from visual inspection nor can the protection afforded by them necessarily be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts which have these special safety characteristics are identified in the parts list of Service manual. Electrical components
having such features are identified by shading on the schematics and by ( ) on the parts list in Service manual. The use of a substitute replacement which does
not have the same safety characteristics as the recommended replacement part shown in the parts list of Service manual may cause shock, fire, or other hazards.
(4) Don't short between the LIVE side ground and
ISOLATED (NEUTRAL) side ground or EARTH side ground when repairing.
Some model's power circuit is partly different in the GND. The difference of the GND is shown by the LIVE : ( ) side GND, the ISOLATED (NEUTRAL) : ( ) side GND and EARTH : ( ) side GND. Don't short between the LIVE side GND and ISOLATED (NEUTRAL) side GND or EARTH side GND and never measure the LIVE side GND and ISOLATED (NEUTRAL) side GND or EARTH side GND at the same time with a measuring apparatus (oscilloscope etc.). If above note will not be kept, a fuse or any parts will be broken.
(5) When service is required, observe the original lead dress.
Extra precaution should be given to assure correct lead dress in the high voltage circuit area. Where a short circuit has occurred, those components that indicate evidence of overheating should be replaced. Always use the manufacturer's replacement components.
(6) Isolation Check (Safety for Electrical Shock Hazard)
After re-assembling the product, always perform an isolation check on the exposed metal parts of the cabinet (antenna terminals, video/audio input and output terminals, Control knobs, metal cabinet, screw heads, earphone jack, control shafts, etc.) to be sure the product is safe to operate without danger of electrical shock.
a) Dielectric Strength Test
The isolation between the AC primary circuit and all metal parts exposed to the user, particularly any exposed metal part having a return path to the chassis should withstand a voltage of 3000V AC (r.m.s.) for a period of one second. (. . . . Withstand a voltage of 1100V AC (r.m.s.) to an appliance rated up to 120V, and 3000V AC (r.m.s.) to an appliance rated 200V or more, for a period of one second.) This method of test requires a test equipment not generally found in the service trade.
b) Leakage Current Check
Plug the AC line cord directly into the AC outlet (do not use a line isolation transformer during this check.). Using a "Leakage Current Tester", measure the leakage current from each exposed metal part of the cabinet, particularly any exposed metal part having a return path to the chassis, to a known good earth ground (water pipe, etc.). Any leakage current must not exceed 0.5mA AC (r.m.s.). However, in tropical area, this must not exceed 0.2mA AC (r.m.s.).
Alternate Check Method
Plug the AC line cord directly into the AC outlet (do not use a line isolation transformer during this check.). Use
an AC voltmeter having 1000 per volt or more sensitivity in the following manner. Connect a 1500 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

1.2 INSTALLATION

1.2.1 HEAT DISSIPATION
If the heat dissipation vent behind this unit is blocked, cooling efficiency may deteriorate and temperature inside the unit will rise. The temperature sensor that protects the unit will be activated when internal temperature exceeds the pre-determined level and power will be turned off automatically.Therefore, please make sure pay attention not to block the heat dissipation vent as well as the ventilation outlet behind the unit and ensure that there is room for ventilation around it.
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

1.3 HANDLING LCD PANEL

1.3.1 PRECAUTIONS FOR TRANSPORTATION
When transporting the unit, pressure exerted on the internal LCD panel due to improper handling (such as tossing and dropping) may cause damages even when the unit is carefully packed. To prevent accidents from occurring during transportation, pay careful attention before delivery, such as through explaining the handling instructions to transporters. Ensure that the following requirements are met during transportation, as the LCD panel of this unit is made of glass and therefore fragile:
(1) USE A SPECIAL PACKING CASE FOR THE LCD PANEL
When transporting the LCD panel of the unit, use a special packing case (packing materials). A special packing case is used when a LCD panel is supplied as a service spare part.
(2) ATTACH PROTECTION SHEET TO THE FRONT
Since the front (display part) of the panel is vulnerable, attach the protection sheet to the front of the LCD panel before transportation. Protection sheet is used when a LCD panel is supplied as a service spare part.
(3) AVOID VIBRATIONS AND IMPACTS
The unit may be broken if it is toppled sideways even when properly packed. Continuous vibration may shift the gap of the panel, and the unit may not be able to display images properly. Ensure that the unit is carried by at least 2 persons and pay careful attention not to exert any vibration or impact on it.
(4) DO NOT PLACE EQUIPMENT HORIZONTALLY
Ensure that it is placed upright and not horizontally during transportation and storage as the LCD panel is very vulnerable to lateral impacts and may break. During transportation, ensure that the unit is loaded along the traveling direction of the vehicle, and avoid stacking them on one another. For storage, ensure that they are stacked in 2 layers or less even when placed upright.
1.3.2 OPTICAL FILTER (ON THE FRONT OF THE LCD PANEL)
(1) Avoid placing the unit under direct sunlight over a
prolonged period of time. This may cause the optical filter to deteriorate in quality and color.
(2) Clean the filter surface by wiping it softly and lightly with a
soft and lightly fuzz cloth (such as outing flannel).
(3) Do not use solvents such as benzene or thinner to wipe the
filter surface. This may cause the filter to deteriorate in quality or the coating on the surface to come off. When cleaning the filter, usually use the neutral detergent diluted with water. When cleaning the dirty filter, use water-diluted ethanol.
(4) Since the filter surface is fragile, do not scratch or hit it with
hard materials. Be careful enough not to touch the front surface, especially when taking the unit out of the packing case or during transportation.
1.3.3 PRECAUTIONS FOR REPLACEMENT OF EXTERIOR PARTS
Take note of the following when replacing exterior parts (REAR COVER, FRONT PANEL, etc.):
(1) Do not exert pressure on the front of the LCD panel (filter
surface). It may cause irregular color.
(2) Pay careful attention not to scratch or stain the front of the
LCD panel (filter surface) with hands.
(3) When replacing exterior parts, the front (LCD panel) should
be placed facing downward. Place a mat, etc. underneath to avoid causing scratches to the front (filter surface).
(No.YA512)1-5
Page 6
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS

2.1 SYSTEM 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

2.2 FEATURES

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.

2.3 MAIN DIFFRENCE LIST

ITEMS
LT-32E478/S LT-42E478/V
Speaker 5.0 cm × 12.0 cm,
oval type × 2
MODELS
4.0 cm × 16.0 cm, twin oblique type × 2
ANALOG PWB ASS'Y SFN-1001A-M2 SFN-1002A-M2
POWER PWB ASS'Y SFN-9001A-M2 SFN-9002A-M2
DIGITAL PWB ASS'Y SFN0D001A-M2 SFN0D002A-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

2.4 TECHNICAL 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.
2.4.1.1 SPECIFICATIONS
The following table shows the specifications of this unit.
Item
LT-32E478/S LT-42E478/V
Specifications
Maximum dimensions ( W × H × D ) 76.0 cm × 45.0 cm × 4.8 cm 98.3 cm × 57.6 cm × 5.2 cm
Weight 7.5 kg 12.6 kg
Effective screen size Diagonal: 80.0 cm (H: 69.8 cm × V: 39.2 cm) Diagonal: 107.3 cm (H: 93.0 cm × V: 52.3 cm)
Aspect ratio 16 : 9
Drive device / system a-Si-TFT active matrix system
Resolution Horizontally 1366 × Vertically 768 × RGB < W-XGA > 3147264 dots in total
Pixel pitch (pixel size)
Horizontally: 0.51075 mm, Vertically: 0.51075 mm Horizontally: 0.681 mm, Vertically: 0.681 mm
Displayed colour 16777216 colours 256 colours for R G and B
Brightness 500 cd/m
2
Contrast ratio 1200 : 1 1500 : 1
Response time 8 ms
View angle Horizontally: 178°, Vertically: 178°
Surface polarizer Anti-Glare type Low reflective coat
Colour filter Vertical stripe
Backlight Cold cathode fluorescent lamp × 12 Cold cathode fluorescent lamp × 20
Power supply voltage in LCD 5 V 12 V
Power supply voltage in inverter 24 V
Panel interface system LVDS (Low Voltage Differential Signaling)
2.4.1.2 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 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 name I/O Function
No.
1 NC O Not used 51 ATSC_TX I Serial communication for ATSC tuner
2 SHUTDOWN O Power consumption control [Shutdown: H] 52 ATSC_RX O Serial communication for ATSC tuner
3 M_MUTE O Audio output muting [Muting: H] 53 NC O Not used
4 A_MUTE O Audio muting [Muting: H] 54 3.3V I Reference voltage [+3.3V Fixed]
5 NC O Not used 55 NC O
6 NC O Not used 56 NC O
7 NC O Not used 57 SDA0 I/O I2C bus (data) for Main memory
8 NC O Not used 58 SCL0 I/O I
9 BL_ON O Control of Backlight [On: L] 59 NC O Not used
10 UPDATE I MAIN CPU update 60 NC O Not used
11 POW_LED O
12 DIMMER_LED O
Lighting for Power/OnTimer LED [Power ON or TIMER ON: H]
Brightness control for Power/OnTimer LED [High luminance: H]
13 NC O Not used 63 NC O Not used
14 NC O Not used 64 NC O Not used
15 NC O Not used 65 NC O Not used
16 NC O Not used 66 3.3V I +3.3V
17 3.3V I +3.3V 67 NC O Not used
18 N.C O Not used 68 NC O Not used
19 GND - GND 69 NC O Not used
20 3.3V I Not used : Low speed oscillator 70 NC O Not used
21 NC O Not used : Low speed oscillator 71 NC O Not used
22 3.3V I +3.3V 72 NC O Not used
23 OSCI I Oscillation for system clock (16MHz) 73 SBD5 I/O Data on-board writing for flash memory
24 OSCO O Oscillation for system clock (16MHz) 74 SBT5 I Clock on-board writing for flash memory
25 3.3V I Single chip mode for CPU 75 3.3V I +3.3V
26 NC O Not used 76 CEC_IN O Not used
27 NC O Not used 77 REMOCON I Remote control
28 TU_RESET O Reset for tuner [Reset: H] 78 V_SYNC O Not used : V. sync signal output
29 NC O Not used 79 NC O Not used
30 NC O Not used 80 POWERGOOD O Not used : Power error detection [NG: H]
31 NC O Not used 81 NC O Not used
32 HP_DET O Not used: Headphone detection 82 RST I CPU reset [Reset: L]
33 HP_MUTE O Not used: Headphone output muting 83 3.3V I +3.3V
34 3.3V I +3.3V 84 SCL1 I/O I
35 P_MUTE O Picture muting [Muting: H] 85 SDA1 I/O I
36 PFC_POW O PFC power control [Power on: L] 86 SCL2 I/O Not used
37 NC O B1 over current protect detection [Protection: H] 87 SDA2 I/O Not used
38 LCD_POW O Panel power control [Power on: L] 88 NC O Not used
39 LOB_PRO I Low-B protect detection [Protection: H] 89 NC O Not used
40 MECA_SW I Machine SW interrupt detection [SW Pushing: L] 90 NC O Not used
41 MAIN_POW O Main power control [Power on: L] 91 I2C_STOP O Not used
42 LB_POW O Low-B power control [Power on: L] 92 GND - GND
43 0V I Reference voltage [GND Fixed] 93 CEC_OUT O Not used
44 EE O Not used: EE sensor 94 NC O Not used
45 NC O Not used 95 NC O Not used
46 KEY2 I Front key scan voltage (VOL+/- INPUT) 96 NC O Not used
47 KEY1 I Front key scan voltage (CH+/- MENU) 97 NC O Not used
48 NC O Not used 98 NC O Not used
49 NC O Not used 99 NC O Not used
50 AC_IN I AC 50/60Hz for timer clock 100 JCC5057_BUSY I
Pin No.
Pin name I/O Function
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_PHOT I 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

3.1 CAUTION 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.

3.2 DISASSEMBLY 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

3.3 DISASSEMBLY 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

3.4 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.
3.4.1 MEMORY IC TABLE
Simbol Number of pins Mounting PWB Main content of data
IC6002
IC7002
32-pin DIGITAL PWB Program of IC6001(Video process) is memorized.
8-pin ANALOG PWB Setting 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 items Settings Item No.
1. Digital Service
Audio syetem setting-1 Adjust A001 - A008
Micom setting
Fixed
C001 - C032 X001 - X133 S029 - S149
2. TV-Micro Service
Video syetem setting Adjust S001 - S008
Audio syetem setting-2 Fixed A001 - A005
Factory syetem setting Fixed F001
(No.YA512)1-13
Page 14
3.4.4 SETTINGS OF FACTORY SHIPMENT
3.4.4.1 BUTTON OPERATION 3.4.4.2 REMOTE CONTROL DIRECT OPERATION
Setting item Setting position
POWER Off
CHANNEL CABLE-02
VOLUME 10
INPUT TV
3.4.4.3 REMOTE 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
Tint 00000000
Color 0 0 +6 +6 0 0 0 0
Picture 0 0+10+100 0-10-10
Bright 00000000
Detail 00+1+10000
Energy Saver Mode +20 +15 +30 +30 -10 -20 0 0
Color Temperature LOW LOW HIGH HIGH HIGH HIGH HIGH HIGH
Color ManagementONONONONONONONON
Dynamic Gamma ONONONONONONONON
Noise Reduction LOW LOW LOW LOW LOW LOW LOW LOW
Natural Cinema AUTO AUTO AUTO AUTO AUTO AUTO AUTO AUTO
Position Adjustment Center Center Center Center Center Center Center Center
STANDARD DYNAMIC THEATER GAME
LT-32E478 LT-42E478 LT-32E478 LT-42E478 LT-32E478 LT-42E478 LT-32E478 LT-42E478
INPUT TV
CHANNEL CABLE-02
VOLUME 10
MUTING OFF
DISPLAY OFF
ASPECT NTSC PANORAMA
SLEEP TIMER OFF
VIDEO STATUS DYNAMIC
MTS STEREO
SOUND EFFECT
Setting item Setting position
HD / ATSC FULL
A.H.S. OFF
SMART SOUND
OFF
< HD MODE >
Setting item
Tint 00000000
Color 0 0 +6 +6 0 0 0 0
Picture 0 0+10+100 0-10-10
Bright 00000000
Detail 00+2+20000
Energy Saver Mode +20 +15 +30 +30 -10 -20 0 0
Color Temperature LOW LOW HIGH HIGH HIGH HIGH HIGH HIGH
Color ManagementONONONONONONONON
Dynamic Gamma ONONONONONONONON
Noise Reduction--------
Natural Cinema --------
Position Adjustment Center Center Center Center Center Center Center Center
1-14 (No.YA512)
STANDARD DYNAMIC THEATER GAME
LT-32E478 LT-42E478 LT-32E478 LT-42E478 LT-32E478 LT-42E478 LT-32E478 LT-42E478
Page 15
INITIAL SETUP
Setting item Setting position
Noise Muting On
Language English
Front Panel Lock Off
V-Chip Off
Set Lock Code 0000
Closed Caption Off(CC1/T1)
Auto Shut Off Off
Power Indicator HIGH
Quick start up Off
EXTERNAL INPUT
Setting item Setting position
HDMI Size Auto
Video-1 Audio Auto
Video Input Label All blank
SOUND ADJUST
Setting item Setting position
Bass 0
Treble 0
Balance 0
Optical Out PCM
Turn On Volume Current
Volume Limit 50
CLOCK / TIMERS
Setting item Setting position
Set Clock Manual
On / Off Timer Off
(No.YA512)1-15
Page 16

3.5 REPLACEMENT OF CHIP COMPONENT

3.5.1 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.
3.5.2 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

4.1 ADJUSTMENT 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.

4.2 PRESET SETTING BEFORE ADJUSTMENTS

Unless otherwise specified in the adjustment items, preset the following functions with the REMOTE CONTROL UNIT.
Setting item Settings
VIDEO STATUS STANDARD
BRIGHT / CONTRAST / COLOR / TINT
00
COLOR TEMPERATURE LOW
COLOR MANAGEMENT ON
NATURAL CINEMA OFF
TREBLE / BASS / BALANCE 00
SMART SOUND OFF
MTS STEREO
A.H.S. OFF
ASPECT FULL

4.3 MEASURING INSTRUMENT AND FIXTURES

• Signal generator (Pattern generator) [NTSC]
• TV audio multiplex signal generator
• Remote control unit

4.4 ADJUSTMENT ITEMS

VIDEO CIRCUIT [2. TV-Micro Service]
• WHITE BALANCE (HIGHLIGHT) adjustment
MTS CIRCUIT [1. Digital Service]
• MTS INPUT LEVEL adjustment
• MTS SEPARATION adjustment

4.5 SERVICE MODE

4.5.1 BASIC OPERATION OF SERVICE MODE
Operate the SERVICE MODE with the REMOTE CONTROL UNIT.
4.5.1.1 HOW 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
4.5.1.2 HOW TO EXIT THE SERVICE MODE Press the [MENU] key to exit the SERVICE MODE.
4.5.1.3 HOW 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.
4.5.1.4 SERVICE 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
TUNE RETURN+/TV
0
V1 V4V2 V3
MUTING
CH+
VOL
FAV.
-
CH-
ML/MTS DISPLAY C.C. ASPECT
MENU BACK 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] key Press [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).
4.5.3.1 DIGITAL 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.
SIGNAL SYSTEM
SCREEN SIZE
VIDEO STATUS
WHITE BALANCE
(1) SIGNAL SYSTEM
The signal displayed on the screen is displayed.
NTSC : 525i (Composite / S-video input) 525i : 525i (Component input) 525p : 525p (Component input) 750p : 750p (Component input) 1125i : 1125i (Component input) D525i : ATSC 525i D525p : ATSC 525p D750p : ATSC 750p D1125i : ATSC 1125i H525i : HDMI 525i H525pS1 : HDMI 525p size1 H525pS2 : HDMI 525p size2 H750p : HDMI 750p H1125i : HDMI 1125i
(2) SCREEN SIZE
State of the ASPECT is displayed.
43Full : FULL (Input signal 4 : 3) 43Pano : PANORAMA (Input signal 4 : 3) 43Cinema : CINEMA (Input signal 4 : 3) 43Regular : REGULAR (Input signal 4 : 3) 16Full : FULL (Input signal 16 : 9) 16Pano : PANORAMA ZOOM (Input signal 16 : 9) 16Cinema : CINEMA ZOOM (Input signal 16 : 9) 16Slim : SLIM (Input signal 16 : 9)
(3) VIDEO STATUS
State of the VIDEO STATUS is displayed.
Standard : STANDARD Dynamic : DYNAMIC Theater : THEATER Game : GAME
Item No. Setting item
A001 - A008 Audio system setting-1
C001 - C032 Micom setting-1 [Do not adjust]
X001 - X133 Micom setting-2 [Do not adjust]
S029 - S149 Micom setting-3 [Do not adjust]
SELECTION OF SETTING ITEM
[CH+] / [CH-] key. Change the setting items up/ down.
[SLEEP] key. Switch to the next items.
(7) SETTING VALUE (DATA)
The SETTING VALUE is displayed.
CHANGE OF SETTING VALUE (DATA)
[VOL+] / [VOL-] key. Change the setting values up/down.
MEMORY OF SETTING VALUE (DATA)
Changed setting value is memorized by pressing
[MUTING] key.
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.
3. Xilleon Register Edit
Setting value in the digital module is edited and confirmed 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.
(No.YA512)1-19
Page 20
5. Select Channel Map
Channel map is forcibly rewritten 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.
6. Clear Channel Map
Channel map is cleared 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.
4.5.3.2 TV-MICRO SERVICE MODE
1. Adjust
SETTING ITEM No.
SETTING ITEM NAME
S001 PREPARE 00 NTSC 43Full STD L
SETTING VALUE (DATA)
7. Digital Tuning Test
Digital channel tuning is tested 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.
(6) SETTING ITEM NO.
Setting item numbers are displayed. The setting item numbers to be displayed are listed below.
Item No. Setting item
S001 - S008 Video system setting
A001 - A005 Audio system setting-2 [Do not adjust]
F001 Factory system setting [Do not adjust]
SELECTION OF SETTING ITEM
[CH+] / [CH-] key. Change the setting items up/ down.
SIGNAL SYSTEM
SCREEN SIZE
VIDEO STATUS
WHITE BALANCE
(1) SIGNAL SYSTEM
It is similar to DIGITAL SERVICE MODE.
(2) SCREEN SIZE
It is similar to DIGITAL SERVICE MODE.
(3) VIDEO STATUS
State of the VIDEO STATUS is displayed.
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

4.6 INITIAL 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]
4.6.1.1 AUDIO SETTING-1
No. Setting item Variable range
A001 IN LEVEL 0 - 15 7 8
A002 LOW SEP 0 - 63 25 23
A003 HIGH SEP 0 - 63 29 33
A004 DAC CNTL 1 0 - FF F F
A005 DAC CNTL 2 0 - FF 2 2
A006 DAC CNTL 3 0 - FF 0 0
A007 DAC ATT L 00 - FF FF FF
A008 DAC ATT R 00 - FF FF FF
4.6.2 [2. TV-Micro Service]
4.6.2.1 VIDEO SETTING
No. Setting item Variable range
S001 PREPARE 00 - FF 00 00
S002 R DRIVE 0 - 255 137 137
S003 G DRIVE 0 - 255 137 137
S004 B DRIVE 0 - 255 137 137
S005 ADDR H 00 - FF 00 00
S006 ADDR L 00 - FF 00 00
S007 DATA H 00 - FF 00 00
S008 DATA L 00 - FF 00 00
Initial setting value
LT-32E478/S LT-42E478/V
Initial setting value
LT-32E478/S LT-42E478/V
4.6.2.2 AUDIO SETTING-2
No. Setting item Variable range
A001 BASS OFS -128 - +127 5 5
A002 TREB OFS -128 - +127 4 5
A003 AGC FLAT 0 - 3 1 1
A004 MOVIEOFS -128 - +127 0 0
A005 MUSICOFS -128 - +127 0 0
4.6.2.3 FACTRY SETTING
No. Setting item Variable range
F01 DTVM RST 0 - 1 1 1
Initial setting value
LT-32E478/S LT-42E478/V
Initial setting value
LT-32E478/S LT-42E478/V
(No.YA512)1-21
Page 22

4.7 ADJUSTMENT PROCEDURE

4.7.1 VIDEO CIRCUIT [2. TV-Micro Service]
Item
WHITE BALANCE
Measuring
instrument
Remote control unit
Test point Adjustment part Description
(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 point Adjustment part Description
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

5.1 SELF 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 item Display Detection content
MTS decoder BTSC Dec Confirmation of reply of ACK signal which
2
C communication.
uses I
[DIGITAL PWB]
IC2101
Diagnosis
signal (line)
Detection timing
SDA If 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 input Digital-IN Confirmation 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.
SDA Same as above.
SDA Same as above.
<Page 2 of screen>
Detection item Display Detection 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_PRO At 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
[ANALOG PWB] 9V: IC9301 [ANALOG PWB] 12V: Q9651 [ANALOG PWB] 14V/24V: IC9501
[ANALOG PWB]
24V: Q9551 [POWER PWB]
Timer (clock) TIM The power frequency is changed as
follows: 50Hz 60Hz / 60Hz→50Hz.
PC9201
[POWER PWB]
AC_IN Detection starts 3 seconds after the
power is turned on. Periodically check the power frequency by counting the AC pulse and monitor whether or not the frequency is changed.
Photo detect PHOTO Operation 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 process AUDIO Confirmation of reply of ACK signal which
Hostlink Communication 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.
SDA If it checks whenever I
communication is performed and no reply of ACK signal an error will be counted.
LCD drive RGB Confirmation of reply of ACK signal which
Memory A-EEPROM Confirmation of reply of ACK signal which
2
C communication.
uses I
[DIGITAL PWB]
IC6001
2
uses I
C communication.
SDA Same as above.
SDA Same 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.
Item POWER LED ON / OFF intervals
Low B short protection Turning 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
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