JVC LT-26DR7BJ User manual

SERVICE MANUAL
COPYRIGHT © 2006 Victor Company of Japan, Limited No.YA408
2006/5
LCD INTEGRATED DIGITAL TELEVISION
YA40820063LT-26DR7BJ, LT-26DR7BJ/P, LT-26DR7SJ,
LT-26DR7SJ/P, LT-32DR7BJ, LT-32DR7BJ/P,
LT-32DR7SJ, LT-32DR7SJ/P,LT-37DR7BJ,
LT-37DR7BJ/P, LT-37DR7SJ, LT-37DR7SJ/P
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-24
BASIC CHASSIS
FL3

1-2 (No.YA408)
SPECIFICATION
Design & specifications are subject to change without notice.
Items
Contents
LT-26DR7BJ
LT-26DR7SJ
LT-32DR7BJ
LT-32DR7SJ
LT-37DX7BJ
LT-37DX7SJ
Dimensions ( W ×H ×D )
67.2 cm × 51.7 cm × 24.4 cm [Included stand]
67.2 cm
× 47.1 cm × 137.7 cm [TV only]
80.0 cm
× 59.1 cm × 24.4 cm [Included stand]
80.0 cm
× 54.5 cm × 137.8 cm [TV only]
91.9 cm
× 64.9 cm × 31.1 cm [Included stand]
91.9 cm
× 60.3 cm × 12.8 cm [TV only]
Mass 14.9 kg [Included stand]
13.0 kg [TV only]
17.9 kg [Included stand]
16.0 kg [TV only]
23.2 kg [Included stand]
20.3 kg [TV only]
Power Input AC220V - AC240 V, 50 Hz
Power Consumption 113 W (Standby: 0.6 W) 136 W (Standby: 0.6 W) 162 W (Standby: 0.5 W)
TV RF System Analog
Digital
CCIR (I)
DVB-T
Colour System PAL, NTSC 3.58/4.43 [EXT only]
Stereo System NICAM ( I )
Receiving
Frequency
Analog
Digital
UHF: 470 MHz - 862 MHz
UHF: 474 MHz - 850 MHz
Intermediate
Frequency
VIF
SIF
38.9MHz ( I )
32.9MHz (6.0MHz :I)
Colour Sub
Carrier Frequency
PAL
NTSC
4.43MHz
3.58MHz / 4.43MHz
Teletext System Analog
Digital
FLOF (Fastext level 2.5), WST(World Standard system)
MHEG 5 UK profile
LCD panel 26V-inch wide aspect (16 : 9) 32V-inch wide aspect (16 : 9) 37V-inch wide aspect (16 : 9)
Screen Size Diagonal : 66 cm
(H: 57.6 cm ×V: 32.4 cm)
Diagonal : 80 cm
(H: 69.7 cm ×V: 39.2 cm)
Diagonal : 94 cm
(H: 82.6 cm ×V: 46.1 cm)
Display Pixels Horizontal : 1366 dots ×Vertical : 768 dots (W-XGA)
Audio Power Output 10 W + 10 W
Speaker 5 cm ×12 cm, Oval type ×2 5.5 cm ×15 cm, Oval type ×2
4 cm × 16 cm , Oval type ×2
Aerial terminal (VHF/UHF) 75 Ωunbalanced, coaxial
EXT-1 / EXT-2 (Input / Output) 21-pin Euro connector (SCART socket ) ×2
EXT-3 (Input) S-Video
Video
Audio
Mini-DIN 4 pin ×1
Y: 1 V (p-p), Positive (Negative sync provided), 75 Ω
C: 0.286 V (p-p) (Burst signal), 75 Ω
1 V (p-p), Positive (Negative sync provided), 75 Ω, RCA pin jack ×1
500 mV (rms), High impedance, RCA pin jack ×2
EXT-4 (Input) Component Video
750p / 1125i
625p / 525p / 625i / 525i
Audio
RCA pin jack ×3
Y : 1 V (p-p) (Sync signal: ±0.35V(p-p), 3-value sync.), 75Ω
Pb/Pr : ±0.35V(p-p), 75 Ω
Y : 1 V (p-p), Positive (Negative sync provided), 75 Ω
Cb/Cr : 0.7V(p-p), 75 Ω
500 mV(rms) (-4dBs), high impedance, RCA pin jack ×2
EXT-5
(HDMI Input)
Video
Audio
HDMI 2-row 19pin connector ×1
(Digital-input terminal is not compatible with picture signals of personal computer)
Digital: HDMI 2-row 19pin connector ×1
Anarog: 500mV(rms) (-4dBs), high impedance, RCA pin jack ×2
PC (RGB) Input D-sub 15 pin ×1
R/G/B : 0.7 V (p-p), 75Ω
HD / VD : 1 V (p-p) to 5 V (p-p), high impedance
< Available signal >
VGA : 640 pixels ×480 pixels (Horizontal : 31.5 kHz / Vertical : 60 Hz)
XGA : 1024 pixels ×768 pixels (Horizontal : 48.4 kHz / Vertical : 60 Hz)
Audio output 500 mV (rms), Low impedance, RCA pin jack ×2
Headphone 3.5 mm stereo mini jack ×1
Remote Control Unit RM-C1905S (AAA/R03 dry cell battery ×2)

(No.YA408)1-3
SECTION 1
PRECAUTION
1.1 SAFETY PRECAUTIONS
(1) The design of this product contains special hardware and many circuits and components specially for safety purposes. For
continued protection, no changes should be made to the original design unless authorized in writing by the manufacturer.
Replacement parts must be identical to those used in the original circuits. Service should be performed by qualified personnel
only.
(2) Alterations of the design or circuitry of the product should not be made. Any design alterations or additions will void the
manufacturer's warranty and will further relieve the manufacturer of responsibility for personal injury or property damage
resulting therefrom.
(3) Many electrical and mechanical parts in the product have special safety-related characteristics. These characteristics are often
not evident from visual inspection nor can the protection afforded by them necessary be obtained by using replacement
components rated for higher voltage, wattage, etc. Replacement parts which have these special safety characteristics are
identified in the Parts List of Service Manual. Electrical components having such features are identified by shading on the
schematics and by ( ) on the Parts List in the Service Manual. The use of a substitute replacement which does not have the
same safety characteristics as the recommended replacement part shown in the Parts List of Service Manual may cause shock,
fire, or other hazards.
(4) The leads in the products are routed and dressed with ties, clamps, tubing’s, barriers and the like to be separated from live parts,
high temperature parts, moving parts and / or sharp edges for the prevention of electric shock and fire hazard. When service is
required, the original lead routing and dress should be observed, and it should be confirmed that they have been returned to
normal, after re-assembling.
WARNING
(1) The equipment has been designed and manufactured to meet international safety standards.
(2) It is the legal responsibility of the repairer to ensure that these safety standards are maintained.
(3) Repairs must be made in accordance with the relevant safety standards.
(4) It is essential that safety critical components are replaced by approved parts.
(5) If mains voltage selector is provided, check setting for local voltage.

1-4 (No.YA408)
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.
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.
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.
1.2.4 NOTES ON HANDLING
(1) WHEN TAKING UNIT OUT OF A PACKING CASE
When taking the unit out of a packing case, do not grasp
the upper part of the unit. If you take the unit out while
grasping the upper part, the LCD PANEL may be damaged
because of a pressure. Instead of grasping the upper part,
put your hands on the lower backside or sides of the unit.
(2) AS FOR PRESSING OR TOUCHING A SPEAKER
Be careful not to press the opening of the speaker in the
lower part of the unit and around them since the decorative
sheet on the surface of the openings may be deformed.
Ventilation hole
*Diagram differs from actual appearance.
*Diagram differs from actual appearance.
200mm
50mm150mm 150mm 50mm
It fixes in a band.
TV STAND
*Diagram differs from actual appearance.
< SIDE VIEW >

(No.YA408)1-5
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 COLOUR.
(2) Clean the filter surface by wiping it softly and lightly with a
soft and lightly fuzz cloth (such as outing flannel).
(3) Do not use solvents such as benzene or thinner to wipe the
filter surface. This may cause the filter to deteriorate in
quality or the coating on the surface to come off. When
cleaning the filter, usually use the neutral detergent diluted
with water. When cleaning the dirty filter, use water-diluted
ethanol.
(4) Since the filter surface is fragile, do not scratch or hit it with
hard materials. Be careful enough not to touch the front
surface, especially when taking the unit out of the packing
case or during transportation.
1.3.3 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 COLOUR.
(2) Pay careful attention not to scratch or stain the front of the
LCD panel (filter surface) with hands.
(3) When replacing exterior parts, the front (LCD panel) should
be placed facing downward. Place a mat, etc. underneath
to avoid causing scratches to the front (filter surface).

1-6 (No.YA408)
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
2.1 SYSTEM SETTEING
(1) Press the [INFORMATION] key and [MUTING] key
simultaneously, then enter the SERVICE MODE.
(2) When the Main Menu is displayed, press [2] key to enter
the self check mode.
(3) Turn off the power by pressing the [POWER] key on the
remote control unit.
2.2 FEATURES
DVB-T
This TV can receive both DVB-T (Digital terrestrial broadcasting)
and Analogue terrestrial 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.
Colour Management
This function ensures dull colours 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.
3D Cinema Sound
You can enjoy sounds with a widerambience.
2.3 MAIN DIFFERENCE LIST
Be sure to carry out the following operation at the end of
the procedure.
SELF CHECK MODE SCREEN
SERVICE MENU SCREEN
SERVICE MENU
SERVICE MENU
1. ADJUST
1. ADJUST
2. SELF CHECK
2. SELF CHECK
3. I2C STOP
3. I2C STOP
LOB 0 FAN 0
LOB 0 FAN 0
AUD 0
AUD 0
ANA 9 DIG 9
ANA 9 DIG 9
0000 00
0000 00
00
00
Item LT-26DR7BJ
LT-26DR7BJ/P
LT-26DR7SJ
LT-26DR7SJ/P
LT-32DR7BJ
LT-32DR7BJ/P
LT-32DR7SJ
LT-32DR7SJ/P
LT-32DR7BJ
LT-32DR7BJ/P
LT-32DR7SJ
LT-32DR7SJ/P
Paint colour Silver & Black Silver Silver & Black Silver Silver & Black Silver

(No.YA408)1-7
2.4 HOW TO IDENTIFY MODELS
2.5 21-PIN EURO CONNECTOR (SCART) : EXT-1 / EXT-2
(P-P= Peak to Peak, B-W= Blanking to white peak)
Except "/P" models : "AE" is added to the serial No. after at the Rating label.
"/P" models : "PE" is added to the serial No. after at the Rating label.
Pin No. Signal designation Matching value EXT-1 EXT-2
1 AUDIO R output 500mV(rms) (Nominal), Low impedance Used (TV OUT) Used (LINE OUT)
2 AUDIO R input 500mV(rms) (Nominal), High impedance Used (R1) Used (R2)
3 AUDIO L output 500mV(rms) (Nominal), Low impedance Used (TV OUT) Used (LINE OUT)
4 AUDIO GND Used Used
5 GND (B) Used Used
6 AUDIO L input 500mV(rms) (Nominal), High impedance Used (L1) Used (L2)
7 B input 700mV(B-W), 75ΩUsed Used
8 FUNCTION SW
(SLOW SW)
Low : 0V-3V
High : 8V-12V, High impedance
Used Used
9 GND (G) Used Used
10 SCL / T-V LINK Not used Used (SCL2 / TV-LINK)
11 G input 700mV(B-W), 75ΩUsed Used
12 SDA Not used Used (SDA2)
13 GND (R) Used Used
14 GND (YS) Used Not used
15 R / C input R : 700mV(B-W), 75Ω
C : 300mV(P-P), 75ΩUsed (R) Used (C2/R)
16 Ys input (FAST SW) Low : 0V-0.4V, High : 1V-3V, 75ΩUsed Used
17 GND (VIDEO output) Used Used
18 GND (VIDEO input) Used Used
19 VIDEO output 1V(P-P) (Negative sync), 75ΩUsed (TV OUT) Used (LINE OUT)
20 VIDEO / Y input 1V(P-P) (Negative sync), 75ΩUsed Used
21 COMMON GND Used Used
Indicated
PE
AE
MODEL No.
SERIAL NO.
LT-32DR7BJ
LT-26DR7BJ
LT-37DR7BJ
LT-32DR7SJ
LT-26DR7SJ
LT-37DR7SJ
20 18 16 14 12 10 8 6 4 2
21 19 17 15 13 11 9 7 5 3 1
[Pin assignment]

1-8 (No.YA408)
2.6 TECHNICAL INFORMATION
2.6.1 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.
2.6.1.1 SPECIFICATIONS
The following table shows the specifications of this unit.
2.6.1.2 PIXEL FAULT
There are three pixel faults - bright fault , dark fault and flicker fault - that are respectively defined as follows.
BRIGHT FAULT
In this pixel fault, a cell that should not light originally is lighting on and off.
For checking this pixel fault, input ALL BLACK SCREEN and find out the cell that is lighting on and off.
DARK FAULT
In this pixel fault, a cell that should light originally is not lighting or lighting with the brightness twice as brighter as originally lighting.
For checking this pixel fault, input 100% of each R/G/B colour and find out the cell that is not lighting.
FLICKER FAULT
In the pixel fault, a cell that should light originally or not light originally is flashing on and off.
For checking this pixel fault, input ALL BLACK SCREEN signal or 100% of each RGB colour and find out the cell that is flashing on
and off.
Item Specifications
26V LCD PANEL UNIT 32V LCD PANEL UNIT 37V LCD PANEL UNIT
Maximum dimensions ( W × H × D ) 626 mm ×373 mm ×44.1 mm 760 mm ×450 mm ×48 mm 877 mm ×516.8 mm ×55.5 mm
Weight 5.0 kg 6.9 kg 10.5 kg
Effective screen size Diagonal: 660 mm
(H: 576 mm ×V: 324 mm)
Diagonal: 800 mm
(H: 697 mm ×V: 392 mm)
Diagonal: 940 mm
(H: 820 mm ×V: 461 mm)
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: 0.1405 mm
Vertically: 0.4215 mm
Horizontally: 0.1703 mm
Vertically: 0.5108 mm
Horizontally: 0.2 mm
Vertically: 0.6 mm
Displayed colour 16777216 colours 256 colours for R G and B
Brightness 500cd/m2
Contrast ratio 700 : 1 800 : 1
Response time (Tr + Tf) less than 18 ms
View angle (Horizontally) 178°
View angle (Vertically) 178°
Surface polarizer Anti-Glare type Low reflective coat
Colour filter Vertical stripe
Backlight
Cold cathode fluorescent lamp × 17 Cold cathode fluorescent lamp × 18 Cold cathode fluorescent lamp × 20
Power supply voltage in LCD 12 V
Power supply voltage in inverter 24 V
Panel interface system LVDS (Low Voltage Differential Signaling)

(No.YA408)1-9
2.6.2 MAIN CPU PIN FUNCTION [IC7301 : DIGITAL PWB]
Pin Pin name I/O Function Pin Pin name I/O Function
1 TCK O Test purpose 65 D2 I/O Program ROM data for main CPU
2 TMS I Test purpose 66 D12 I/O Program ROM data for main CPU
3 TDI I Test purpose 67 D10 I/O Program ROM data for main CPU
4 TDO O Test purpose 68 VSS33 - GND
5 P2.8 O TV, Subtitle/OTHER 69 VDD33 I 3.3V
6 P2.9 O Blue for OSD 70 D4 I/O Program ROM data for main CPU
7 P2.10 O Blue for OSD 71 D3 I/O Program ROM data for main CPU
8 P2.11 O Blue for OSD 72 D11 I/O Program ROM data for main CPU
9 P2.12 O Blue for OSD 73 RSTIN I Reset
10 P2.13 O Blue for OSD 74 POWER O Sleep state release for chassis CPU [Relese : L]
11 P2.14 I TV-LINK 75 P3.1 O DM_RESET(IDTV)
12 P2.15 O Request for chassis CPU communication 76 REMOCON I Remote control
13 VSS33 - GND 77 P3.3 I Clock for OSD
14 VDD33 I 3.3V 78 P3.4 O Red for OSD
15 P4.5 O TV-LINK out 79 P3.5 O Red for OSD
16 A20 O Program ROM address for main CPU 80 P3.6 O Red for OSD
17 A19 O Program ROM address for main CPU 81 P3.7 O Red for OSD
18 A18 O Program ROM address for main CPU 82 MTST I/O Data transmission for chassis CPU communication
19 A17 O Program ROM address for main CPU 83 MTSR I/O Data receive for chassis CPU communication
20 VSS25 - GND 84 VSS33 - GND
21 VDD25 I 2.5V 85 VDD33 I 3.3V
22 A16 O Program ROM address for main CPU 86 VSS25 - GND
23 A8 O Program ROM address for main CPU 87 VDD25 I 2.5V
24 A7 O Program ROM address for main CPU 88 TXD0 I/O Communication for adjustment
25 A9 O Program ROM address for main CPU 89 RXD0 I/O Communication for adjustment
26 A6 O Program ROM address for main CPU 90 P3.12 O Red for OSD
27 A5 O Program ROM address for main CPU 91 CLK O Clock for chassis CPU communication
28 A10 O Program ROM address for main CPU 92 P3.15 O Green for OSD
29 A11 O Program ROM address for main CPU 93 P5.14 O Green for OSD
30 A12 O Program ROM address for main CPU 94 P5.15 O Green for OSD
31 VSS33 - GND 95 TRIG_IN O Green for OSD
32 VDD33 I 3.3V 96 TRIG_OUT O Green for OSD
33 A4 O Program ROM address for main CPU 97 P6.2 O Green for OSD
34 A3 O Program ROM address for main CPU 98 P6.3 I/O I2C bus clock (for main memory)
35 A2 O Program ROM address for main CPU 99 P6.4 I/O I2C bus Data (for main memory)
36 A1 O Program ROM address for main CPU 100 P6.5 O Teletext signal select [Analog RGB : H / Digital RGB : L]
37 A0 O Program ROM address for main CPU 101 IRQ O IRQ(IDTV)
38 A13 O Program ROM address for main CPU 102 VSYNC I/O Vertical sync
39 ARAS/A14 O Program ROM address for main CPU 103 HSYNC I/O Horizontal sync
40 CAS/A15 O Program ROM address for main CPU 104
COR/RSTOUT O Not used
41 VSS33 - GND 105 BLANK O Ys for OSD / Teletext
42 VDD33 I 3.3V 106 VDD33 I 3.3V
43 MEMCLK O Clock for memory 107 VSS33 - GND
44 CSSDRAM O Chip select for memory 108 XTAL1 I 6MHz for system clock
45 CLKEN O Clock enable for memory 109 XTAL2 O 6MHz for system clock
46 CSROM O Chip select for memory 110 VSSA - GND
47 RD O Read for memory 111 VDDA I 2.5V
48 UDQM O Control buffer of memory 112 R O R for OSD / Teletext
49 LDQM O Control buffer of memory 113 G O G for OSD / Teletext
50 WR O Write for memory 114 B O B for OSD / Teletext
51 D15 I/O Program ROM data for main CPU 115 VSSA - GND
52 VSS33 - GND 116 VDDA I 2.5V
53 VDD33 I 3.3V 117 CVBS2 I Video for Teletext
54 D7 I/O Program ROM data for main CPU 118 VSSA - GND
55 D0 I/O Program ROM data for main CPU 119 VDDA I 2.5V
56 D14 I/O Program ROM data for main CPU 120 CVBS1B I Video for Teletext
57 D8 I/O Program ROM data for main CPU 121 CVBS1A I Video for Teletext
58 D6 I/O Program ROM data for main CPU 122 VSSA - GND
59 D1 I/O Program ROM data for main CPU 123 VDDA I 2.5V
60 VSS33 - GND 124 KEY1 I Key scan data 1 [ON : H]
61 VDD33 I 3.3V 125 KEY2 I Key scan data 2 [ON : H]
62 D13 I/O Program ROM data for main CPU 126 MECA_SW I Main power ON / OFF control [ON : L]
63 D9 I/O Program ROM data for main CPU 127
(KEYP2)P5.3 I Not used
64 D5 I/O Program ROM data for main CPU 128 TMODE I Test purpose

1-10 (No.YA408)
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.
• When removing each board, remove the connectors as required. Taking notes of the connecting points (connector numbers) makes
service procedure manageable.
• Make sure that there is no bent or stain on the connectors before inserting, and firmly insert the connectors.
3.2 DISASSEMBLY PROCEDURE [26 inch models and 32 inch models]
3.2.1 REMOVING THE STAND (Fig.1)
(1) Remove the 4 screws [A].
(2) Remove the STAND.
3.2.2 REMOVING THE REAR COVER (Fig.1)
• Remove the STAND.
(1) Remove the JACK COVER (L/R).
(2) Remove the 7 screws [B], the 5 screws [C], and the 1
screw [D].
(3) Remove the REAR COVER.
3.2.3 REMOVING THE POWER PWB (Fig.1)
• Remove the STAND.
• Remove the REAR COVER.
(1) Remove the 1 screw [E].
(2) Remove the POWER CORD HOLDER.
(3) Remove the POWER CORD from the POWER PWB.
(4) Remove the 4 screws [F].
(5) Remove the POWER PWB.
3.2.4 REMOVING THE D-AMP PWB (Fig.1)
• Remove the STAND.
• Remove the REAR COVER.
(1) Remove the 2 screw [G].
(2) Remove the D-AMP PWB.
3.2.5 REMOVING THE ANALOG PWB (Fig.1)
• Remove the STAND.
• Remove the REAR COVER.
• Remove the D-AMP PWB.
(1) Remove the 3 screws [H] and 2 screws [J].
(2) Remove the TERMINAL BASE.
(3) Remove the 1 screw [K].
(4) Remove the TUNER BASE.
(5) Remove the 2 screws [L].
(6) Remove the D-AMP BRACKET.
(7) Remove the 3 screws [M] and 2 screws [N].
(8) Remove the ANALOG PWB.
3.2.6 REMOVING THE DC-DC PWB (Fig.1)
• Remove the STAND.
• Remove the REAR COVER.
(1) Remove the 4 screws [P].
(2) Remove the BACK BRACKET.
(3) Remove the 4 screws [Q].
(4) Remove the DC-DC PWB.
3.2.7 REMOVING THE DIGITAL TUNER UNIT (Fig.1)
• Remove the STAND.
• Remove the REAR COVER.
• Remove the BACK BRACKET.
(1) Remove the 7 hooks of the SHIELD COVER.
(2) Remove the SHIELD COVER by sliding it in the direction of
the arrow.
(3) Remove the 5 screws [R] and 2 screws [S].
(4) Remove the DIGITAL TUNER UNIT.
3.2.8 REMOVING THE DIGITAL PWB (Fig.1)
• Remove the STAND.
• Remove the REAR COVER.
• Remove the BACK BRACKET.
• Remove the SHIELD COVER.
• Remove the DIGITAL TUNER UNIT.
(1) Remove the 2 screws [T] and 1 screw [U].
(2) Remove the SHIELD TERMINAL.
(3) Remove the 7 screws [V].
(4) Remove the DIGITAL PWB BRACKET.
(5) Remove the 2 screws [W].
(6) Remove the DIGITAL PWB.
CAUTION :
Make sure to perform the "SYSTEM SETTEING", when
DIGITAL PWB is replaced.

(No.YA408)1-11
Fig.1
FRONT
BACK BRACKET
D-AMP PWB
BRACKET
SHIELD COVER
SHIELD BASE
This exploded view shows the 32 inch models.
26 inch models have almost similar parts
locations.
DIGITAL PWB
BRACKET
$
DA
C
J
H
N
F
E
Q
K
M
U
G
L
T
P
REAR COVER
STAND
JACK COVER
D-AMP PWB
ANALOG PWB
DIGITAL PWB
DC-DC PWB
POWER PWB
TERMINAL BASE
SHIELD TERMINAL
TUNER BASE
POWER CORD HOLDER
POWER CORD
SHIELD COVER
SHIELD TERMINAL
Hook
Hook
Hook
Hook
Hook
Hook
Hook
V
V
R
DIGITAL TUNER
UNIT
S
W

1-12 (No.YA408)
3.2.9 REMOVING THE SW PWB (Fig.2)
• Remove the STAND.
• Remove the REAR COVER.
(1) Remove the 2 screws [A].
(2) Remove the CONTROL ASS’Y with SW PWB.
(3) Remove the 2 screws [B].
(4) Remove the SW PWB from the CONTROL ASS’Y.
3.2.10 REMOVING THE LED PWB (Fig.2)
• Remove the STAND.
• Remove the REAR COVER.
(1) Remove the 2 screws [C].
(2) Remove the LED PWB.
3.2.11 REMOVING THE SPEAKER (Fig.2)
• Remove the STAND.
• Remove the REAR COVER.
(1) Remove the 4 screws [D].
(2) Remove the SPEAKER (L /R).
3.2.12 REMOVING THE LCD PANEL UNIT (Fig.2)
• Remove the STAND.
• Remove the REAR COVER.
• Remove the BACK BRACKET.
• Remove the POWER CORD HOLDER.
(1) Remove the 3 screws [E]. [26 inch models]
(2) Remove the 2 screws [E].[32 inch models]
(3) Remove the STAND BRACKET.
(4) Remove the 3 screws [F].
(5) Remove the MAIN BASE.
(6) Remove the 4 screws [G] and 4 screw [H].
(7) Remove the LCD PANEL UNIT with TOP/BOTTOM
FRAME.
(8) Remove the 2 screws [J].
(9) Remove the TOP FARAME from the LCD PANEL UNIT.
(10) Remove the 2 screws [K].
(11) Remove the BOTTOM FARAME from the LCD PANEL
UNIT.
Fig.2
BOTTOM FRAME
TOP FRAME
FRONT
MAIN BASE
STAND BRACKET
This exploded view shows the 32 inch models.
26 inch models have almost similar parts
locations.
H
K
G
D
D
D
D
F
F
E
J
F
G
J
K
SPEAKER
FRONT PANEL
LCD PANEL UNIT
SPEAKER
A
A
B
C
CONTROL
ASS'Y
SW PWB
LED PWB
DIGITAL PWB SIDE
Check that connector is inserted completly.
(Don't insert aslant)
The terminal of a connector is turned up and connects.
Surely insert and lock.
white Black
white
LCD PANEL SIDE
Black
"LVDS CABLE"
terminal side

(No.YA408)1-13
3.3 DISASSEMBLY PROCEDURE [37 inch models]
3.3.1 REMOVING THE STAND (Fig.3)
(1) Remove the 2 screws [A].
(2) Remove the STNAD COVER.
(3) Remove the 4 screws [B].
(4) Remove the STAND.
3.3.2 REMOVING THE REAR COVER (Fig.3)
• Remove the STAND.
(1) Remove the JACK COVER (L/R).
(2) Remove the 10 screws [C], the 5 screws [D], and the 2
screws [E].
(3) Remove the REAR COVER.
3.3.3 REMOVING THE POWER PWB (Fig.3)
• Remove the STAND.
• Remove the REAR COVER.
(1) Remove the 1 screw [F].
(2) Remove the POWER CORD HOLDER.
(3) Remove the POWER CORD.
(4) Remove the 4 screws [G].
(5) Remove the POWER PWB.
3.3.4 REMOVING THE D-AMP PWB (Fig.3)
• Remove the STAND.
• Remove the REAR COVER.
(1) Remove the 2 screw [H].
(2) Remove the D-AMP PWB.
3.3.5 REMOVING THE ANALOG PWB (Fig.3)
• Remove the STAND.
• Remove the REAR COVER.
• Remove the D-AMP PWB.
(1) Remove the 3 screws [J] and 2 screws [K].
(2) Remove the TERMINAL BASE.
(3) Remove the 1 screw [L].
(4) Remove the TUNER BASE.
(5) Remove the 2 screws [M].
(6) Remove the D-AMP BRACKET.
(7) Remove the 2 screws [N] and 2 screws [P].
(8) Remove the ANALOG PWB.
3.3.6 REMOVING THE DC-DC PWB (Fig.3)
• Remove the STAND.
• Remove the REAR COVER.
(1) Remove the 4 screws [Q].
(2) Remove the BACK BRACKET.
(3) Remove the 2 screws [R].
(4) Remove the DC-DC PWB.
3.3.7 REMOVING THE DIGITAL TUNER UNIT (Fig.1)
• Remove the STAND.
• Remove the REAR COVER.
• Remove the BACK BRACKET.
(1) Remove the 7 hooks of the SHIELD COVER.
(2) Remove the SHIELD COVER by sliding it in the direction of
the arrow.
(3) Remove the 5 screws [S] and 2 screws [T].
(4) Remove the DIGITAL TUNER UNIT.
3.3.8 REMOVING THE DIGITAL PWB (Fig.3)
• Remove the STAND.
• Remove the REAR COVER.
• Remove the BACK BRACKET.
• Remove the SHIELD COVER.
• Remove the DIGITAL TUNER UNIT.
(1) Remove the 2 screws [U] and 1 screw [V].
(2) Remove the SHIELD TERMINAL.
(3) Remove the 7 screws [W].
(4) Remove the DIGITAL PWB BRACKET.
(5) Remove the 2 screws [X].
(6) Remove the DIGITAL PWB.
CAUTION :
Make sure to perform the "SYSTEM SETTEING", when
DIGITAL PWB is replaced.

1-14 (No.YA408)
Fig.3
FRONT
BACK BRACKET
D-AMP PWB
BRACKET
STNAD COVER
STAND
SHIELD COVER
SHIELD BASE
DIGITAL PWB
BRACKET
㧯
E
D
B
A
K
J
P
G
F
R
R
L
N
H
M
Q
REAR COVER
JACK COVER
D-AMP PWB
ANALOG PWB
DC-DC PWB
POWER PWB
TERMINAL BASE
TUNER BASE
POWER CORD HOLDER
POWER CORD
V
U
DIGITAL PWB
SHIELD TERMINAL
SHIELD COVER
SHIELD TERMINAL
Hook
Hook
Hook
Hook
Hook
Hook
Hook
W
W
S
DIGITAL TUNER
UNIT
T
X

(No.YA408)1-15
3.3.9 REMOVING THE SW PWB (Fig.4)
• Remove the STAND.
• Remove the REAR COVER.
(1) Remove the 2 screws [A].
(2) Remove the CONTROL ASS’Y with SW PWB.
(3) Remove the 2 screws [B].
(4) Remove the SW PWB from the CONTROL ASS’Y.
3.3.10 REMOVING THE LED PWB (Fig.4)
• Remove the STAND.
• Remove the REAR COVER.
(1) Remove the 2 screws [C].
(2) Remove the LED PWB.
3.3.11 REMOVING THE SPEAKER (Fig.4)
• Remove the STAND.
• Remove the REAR COVER.
(1) Remove the 4 screws [D].
(2) Remove the SPEAKER (L /R).
3.3.12 REMOVING THE LCD PANEL UNIT (Fig.4)
• Remove the STAND.
• Remove the REAR COVER.
• Remove the BACK BRACKET.
• Remove the POWER CORD HOLDER.
(1) Remove the 2 screws [E].
(2) Remove the STAND BRACKET.
(3) Remove the 3 screws [F].
(4) Remove the MAIN BASE.
(5) Remove the 4 screws [G] and 4 screw [H].
(6) Remove the LCD PANEL UNIT with TOP/BOTTOM
FRAME.
(7) Remove the 2 screws [J].
(8) Remove the TOP FARAME from the LCD PANEL UNIT.
(9) Remove the 2 screws [K].
(10) Remove the BOTTOM FARAME from the LCD PANEL
UNIT.
Fig.4
BOTTOM FRAME
TOP FRAME
MAIN BASE
STAND
BRACKET
FRONT
A
A
B
C
J
G
J
F
F
E
E
F
K
D
D
SPEAKER
SPEAKER
FRONT PANEL
LCD PANEL UNIT
CONTROL
ASS'Y
SW PWB
LED PWB
DIGITAL PWB SIDE
Check that connector is inserted completly.
(Don't insert aslant)
The terminal of a connector is turned up and connects.
Surely insert and lock.
white Black
white
LCD PANEL SIDE
Black
"LVDS CABLE"
terminal side
H

1-16 (No.YA408)
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
3.4.2 MEMORY IC REPLACEMENT PROCEDURE
1. Power off
Switch off the power and disconnect the power plug from the AC outlet.
2. Replace the memory IC
Be sure to use the memory IC written with the initial setting values.
3. Power on
Connect the power plug to the AC outlet and switch on the power.
4. Receiving channel setting
Refer to the OPERATING INSTRUCTIONS and set the receive channels (Channels Preset) as described.
5. User setting
Check the user setting items according to the given in page later. Where these do not agree, refer to the OPERATING
INSTRUCTIONS 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
SERVICE MODE SCREEN
Fig.1
SETTING ITEM
Simbol Number of pins Mounting PWB Main content of data
IC7201 48-pin DIGITAL PWB Progaram(Video process) of IC6001(System CPU) is memorized.
IC7602 8-pin DIGITAL PWB Setting value of IC7301(MAIN CPU) is memorized.
MAIN MENU SCREEN
ADJUSTMENT MODE SCREEN
SERVICE MENU
SERVICE MENU
1. ADJUST
1. ADJUST
2. SELF CHECK
2. SELF CHECK
3. I2C STOP
3. I2C STOP
S001 R DRIVE 137
S001 R DRIVE 137
PAL50 FULL STD H
PAL50 FULL STD H
Setting items Settings Item No.
Video system setting Adjust S001 - S009
Audio system setting Adjust T001 - T003
Main CPU system setting Fixed M001 - M224
Drive system setting Fixed F001 - F002
(Not used) Fixed D001
(Not used) Fixed Z001

(No.YA408)1-17
3.4.4 SETTINGS OF FACTORY SHIPMENT
3.4.4.1 BUTTON OPERATION 3.4.4.2 REMOTE CONTROL DIRECT OPERATION
3.4.4.3 REMOTE CONTROL MENU OPERATION
(1) PICTURE
(2) SOUND
(4) FEATURES
(5) SET UP
(6) DTV
Setting item Setting position
POWER Off
CHANNEL PR1
VOLUME 10
TV/AV TV
Setting item Setting position
CHANNEL PR1
VOLUME 10
ZOOM Panoramic
Setting item Setting position
Picture Mode Bright
Colour Temp. Cool
Features
Super Digipure Auto
Movie Theatre Auto
Colour Management On
Picture Management On
Smart Picture On
MPEG Noise Reduction On
Colour System Main Auto
Sub Auto
4:3 Auto Aspect Panoramic
Setting item Setting position
Stereo / I•ii Stereo Sound
Bass Centre
Treble Centre
Balance Centre
3d Cinema sound Off
Maxx bass Off
Voice Enhancer On
Setting item Setting position
Sleep Timer Off
Child Lock Id No.0000, All Ch Off
Appearance Type D
Blue Back On
Favourite Setting Reset
Illumination Bright
Power Lamp On
Setting item Setting position
Auto Program Tv Channel Automatically Set
Edit/manual Preset Ch Only
Language English
Decoder (Ext-2) Off
Component Auto Select On
Hdmi Setting Auto
Attenuator Off
Ext Setting
S-IN Blank
ID Blank
Dubbing Ext-1 →Ext-2
Setting item Setting position
Timers
Name ∗∗∗∗
Start 00:00
End 00:00
Date 01/01/2004
Mode Inactive
Configuration
Audio Language English
Subtitle English
Favourite Mode off
Receiver Upgrade V.∗.∗
Menu Lock Disabled

1-18 (No.YA408)
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
[Resistors, capacitors, etc.]
(1) As shown in the figure, push the part with tweezers and
alternately melt the solder at each end.
(2) Shift with the tweezers and remove the chip part.
[Transistors, diodes, variable resistors, etc.]
(1) Apply extra solder to each lead.
(2) As shown in the figure, push the part with tweezers and
alternately melt the solder at each lead. Shift and remove
the chip part.
NOTE :
After removing the part, remove remaining solder from the
pattern.
2. How to install Chip parts
[Resistors, capacitors, etc.]
(1) Apply solder to the pattern as indicated in the figure.
(2) Grasp the chip part with tweezers and place it on the
solder. Then heat and melt the solder at both ends of the
chip part.
[Transistors, diodes, variable resistors, etc.]
(1) Apply solder to the pattern as indicated in the figure.
(2) Grasp the chip part with tweezers and place it on the
solder.
(3) First solder lead Aas indicated in the figure.
(4) Then solder leads Band C.
SOLDER SOLDER
A
B
C
A
B
C

(No.YA408)1-19
SECTION 4
ADJUSTMENT
4.1 ADJUSTMENT PREPARATION
(1) There are 2 ways of adjusting this TV : One is with the
REMOTE CONTROL UNIT and the other is the
conventional method using adjustment parts and
components.
(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.
4.3 MEASURING INSTRUMENT AND FIXTURES
• Signal generator (Pattern generator) [PAL]
• Remote control unit
4.4 ADJUSTMENT ITEMS
VIDEO CIRCUIT
• WHITE BALANCE (HIGH LIGHT) adjustment
4.5 BASIC OPERATION OF SERVICE MODE
4.5.1 HOW TO ENTER THE SERVICE MODE
(1) Press [INFORMATION] key and [MUTING] key on the
remote control unit simultaneously to enter the SERVICE
MODE SCREEN.
(2) In the SERVICE MENU, press the [1] key to display
ADJUSTMENT MODE SCREEN.
NOTE:
• Before entering the SERVICE MODE, press the [MODE]
key to confirm that "TV" position is indicated. If it is in a
wrong position, the SERVICE MODE operation cannot be
performed.
• When a number key other than the [1] key is pressed in the
SERVICE MODE SCREEN, the other relevant screen may
be displayed.
This is not used in the adjustment procedure. Press the
[MENU] key to return to the SERVICE MODE SCREEN.
4.5.2 HOW TO EXIT THE SERVICE MODE
Press the [MENU] key to exit the Service mode.
4.5.3 SERVICE MODE SELECT KEY LOCATION
Setting item Settings position
Picture Mode Standard
Picture Adjustments Centre
Colour Temp. Normal
Super Digipure Auto
Movie Theatre Auto
Colour Management On
Picture Management On
Zoom Full
SERVICE MENU
SERVICE MENU
1. ADJUST
1. ADJUST
2. SELF CHECK
2. SELF CHECK
3. I2C STOP
3. I2C STOP
SERVICE MENU SCREEN
[Nunber] key
[FUNCTION
/] key
[MUTING] key
[MODE] key
[INFORMATION] key
[Red] key
[MENU] key
[Green] key
[Function/] key

1-20 (No.YA408)
4.5.4 ADJUSTMENT MODE
This mode is used to adjust the VIDEO CIRCUIT and the MTS CIRCUIT.
4.5.4.1 HOW TO ENTER THE ADJUSTMENT MODE
When the SERVICE MENU SCREEN of SERVICE MODE is displayed, press [1] key to enter the ADJUSTMENT MODE.
4.5.5 DESCRIPTION OF STATUS DISPLAY
(1) SIGNAL SYSTEM
The signal displayed on the screen is displayed.
(2) ZOOM MODE
State of the SCREEN SIZE or MULTI PICTURE is displayed.
SINGLE SCREEN
MULTI SCREEN
(3) PICTURE MODE
(4) COLOUR TEMP.
(5) SETTING ITEM NAME
Setting item name are displayed. For the setting item names
to be displayed, refer to "INITIAL SETTING VALUES IN THE
SERVICE MODE".
(6) SETTING ITEM NO.
Setting item numbers are displayed. The setting item numbers
to be displayed are listed below.
(7) SETTING VALUE (DATA)
The SETTING VALUE is displayed.
4.5.6 CHANGE AND MEMORY OF SETTING VALUE
SELECTION OF SETTING ITEM
• [FUNCTION /] key.
For scrolling up / down the setting items.
CHANGE OF SETTING VALUE (DATA)
•[FUNCTION /]key.
For scrolling up / down the setting values.
MEMORY OF SETTING VALUE (DATA)
Changed setting value is memorized by pressing [MUTING]
key.
PAL50 : PAL50Hz (Composite / S-video)
PAL60 : PAL60Hz (Composite / S-video)
SECAM : SECAM
NTSC3 : NTSC3.58
NTSC4 : NTSC4.43
525I : 525i (Component)
525P : 525p
625I : 625i (Component)
625P : 625p
1125I5 : 1125i 50Hz
1125I6 : 1125i 60Hz
RGB5 : RGB 525i
RGB6 : RGB 625i
PCVGA : PC (VGA)
PCXGA : PC (XGA)
D625I : DVB-T 625i
H525I : HDMI 525i
H525P : HDMI 525p
H625I : HDMI 625i
H625P : HDMI 625p
H750P : HDMI 750p
H125I5 : HDMI 1125i 50Hz
H125I6 : HDMI 1125i 60Hz
--- : OTHER
FULL : FULL
PANO : PANORAMIC
1609 : 16:9 ZOOM
1609S : 16:9 ZOOM SUBTITLE
1409 : 14:9 ZOOM
REGU : REGULAR
M2 : 2-pictures multi
M12 : 12-pictures multi
ADJUSTMENT MODE
SIGNAL SYSTEM
ZOOM MODE
PICTURE MODE
SETTING VALUE (DATA)
SETTING ITEM No.
SETTING ITEM
COLOUR TEMP.
S001 R DRIVE 137
S001 R DRIVE 137
PAL50 FULL STD H
PAL50 FULL STD H
SOFT : SOFT
STD : STANDARD
BRI : BRIGHT
H:COOL
M : NORMAL
L:WARM
Item No. Setting item
S001 - S009 Video system setting
T001 - T003 Audio system setting
M001 - M224 Main CPU system setting
F001 - F002 Drive system setting
D001 (NOT USED)
Z001 (NOT USED)
S001...S009 ↔T001...T003 ↔M001...M224 ↔
F001...F002 ↔D001 ↔Z001↔return to S001