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SERVICE MANUAL
COPYRIGHT © 2005 Victor Company of Japan, Limited
No.YA014D
2005/9
LCD FLAT TELEVISION
YA014D
2005
9
LT-26C31BJE, LT-26C31BUE,
LT-26C31SJE, LT-26C31SUE
DIFFERENCE LIST
EXPLODED VIEW PARTS LIST (Page 3-3)
EXPLODED VIEW (Page 3-5)
Supplementary
Here is information about the additional provided parts for LT-26C31BJE, LT-26C31BUE, LT-26C31SJE and
LT-26C31SUE.
For details other than those described in this manual, please refer to the LT-26C31BJE, LT-26C31BUE,
LT-26C31SJE and LT-26C31SUE service manual (No.YA014, 2003/11).
Ref. No.
Part No.
PART NAME
DESCRIPTION
201
QJJ057-150800-E
INVERTER CABLE-1
CN "P"
202
QJJ057-151610-E
INVERTER CABLE-2
CN "Q"
203
WJW0014-002A
DIGITAL CABLE
CN "X"
201
202
203
LCD PANEL UNIT
BASIC CHASSIS
MK


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(No.YA014D)
AV & MULTIMEDIA COMPANY DISPLAY CATEGORY 12, 3-chome, Moriya-cho, Kanagawa-ku, Yokohama-city, Kanagawa-prefecture, 221-8528, Japan
Victor Company of Japan, Limited
VPT
Printed in Japan
SECTION 1
PRECAUTION
Please refer to "LT-26C31BJE, LT-26C31BUE, LT-26C31SJE and LT-26C31SUE (No.YA014)" about this section.
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
Please refer to "LT-26C31BJE, LT-26C31BUE, LT-26C31SJE and LT-26C31SUE (No.YA014)" about this section.
SECTION 3
DISASSEMBLY
Please refer to "LT-26C31BJE, LT-26C31BUE, LT-26C31SJE and LT-26C31SUE (No.YA014)" about this section.
SECTION 4
ADJUSTMENT
Please refer to "LT-26C31BJE, LT-26C31BUE, LT-26C31SJE and LT-26C31SUE (No.YA014)" about this section.
SECTION 5
TROUBLESHOOTING
Please refer to "LT-26C31BJE, LT-26C31BUE, LT-26C31SJE and LT-26C31SUE (No.YA014)" about this section.


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SERVICE MANUAL
COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LIMITED
No.YA014
2003/11
LCD FLAT TELEVISION
YA014
2003
11
LT-26C31BJE, LT-26C31BUE,
LT-26C31SJE, LT-26C31SUE
TABLE OF CONTENTS
1
PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2
SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
3
DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11
4
ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20
5
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-45
BASIC CHASSIS
MK


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1-2 (No.YA014)
SPECIFICATION
Design and specifications subject to change without notice.
Items
Contents
Dimensions (W
× H × D)
70.3 cm
× 56.0 cm × 2.6 cm (Included stand)
70.3 cm
× 49.1 cm × 9.4 cm (TV only)
Mass
19.0 kg (Included stand)
18.3 kg (TV only)
TV RF System
CCIR B/G, I, D/K, L
Colour System
PAL / SECAM / NTSC 3.58 / NTSC 4.43 (NTSC:EXT only).
Stereo System
A2 (B/G, D/K), NICAM (B/G, I, D/K, L)
Teletext System
FLOF (Fastext), TOP, WST (World Standard System)
Receiving
Frequency
VHF
UHF
CATV
47MHz ~ 470MHz
470MHz ~ 862MHz
116MHz ~ 172MHz / 220MHz ~ 469MHz
Intermediate
Frequency
VIF
SIF
38.9MHz(B/G, D/K, I)
33.4MHz(5.5MHz:B/G) / 32.9MHz(6.0MHz:I) / 32.4MHz(6.5MHz:L,D/K)
Colour Sub
Carrier Frequency
PAL
SECAM
NTSC
4.43MHz
4.40625MHz / 4.25MHz
3.58MHz / 4.43MHz
Power Input
AC110 - AC240 V, 50 Hz / 60 Hz
Power Consumption
148 W, [Standby: 2.8 W]
Aerial Input
75
unbalanced, coaxial
Screen Size
Viewable area 66 cm (measured diagonally)
Display Resolution
Horizonal : 1280 dots
× Vertical : 768 dots (W-XGA)
Speaker
6.6 cm round
× 2 (Oblique corn)
Audio Power Output
10 W + 10 W (Rated power output)
EXT-1 (Input/Output)
21 pin Euro connector (SCART socket)
Video input, Audio L/R inputs and RGB inputs are available.
TV broadcast outputs (Video and Audio L/R) are available.
EXT-2 (Input/Output)
21 pin Euro connector (SCART socket)
Video input, S-VIDEO (Y/C) input, Audio L/R inputs and RGB inputs are available.
Video and Audio L/R outputs are available.
T-V LINK functions are available.
EXT-3 (Input)
S-Video
Video
Audio
Mini-DIN 4 pin
× 1
Y: 1V (p-p), Positive (Negative sync provided), 75
C: 0.286V (p-p) (Burst signal), 75
1V (p-p), Positive (Negative sync provided), 75
, RCA pin jack × 1
500mV (rms), High impedance, RCA pin jack
× 2
EXT-4 (Input)
Component video
Audio (L/R)
RCA pin jack
× 3
Y : 1V(p-p), 75
Pb / B-Y: 0.7V(p-p), 75
Pr / R-Y : 0.7V(p-p), 75
Component video (Pr, Pb, Y) inputs (625p, 525p, 1125i) and Audio L/R inputs are available.
525p and 625p are progressive scanning signals. Some DVD players can output these signals.
1125i is one of the new high-definition signals.
500mV(rms) (-4dBs), High impedance, RCA pin jack
× 2
AUDIO OUT terminal
500mV(rms), Low impedance, RCA pin jack
× 2
Headphone jack
3.5 mm stereo mini jack
× 1
Remote Control Unit
RM-C1808 (AA/R6 dry cell battery
× 2)


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(No.YA014)1-3
SECTION 1
PRECAUTION
1.1
SAFETY PRECAUTIONS [EXCEPT FOR UK]
(1) The design of this product contains special hardware,
many circuits and components specially for safety
purposes. For continued protection, no changes should be
made to the original design unless authorized in writing by
the manufacturer. Replacement parts must be identical to
those used in the original circuits. Service should be
performed by qualified personnel only.
(2) Alterations of the design or circuitry of the products should
not be made. Any design alterations or additions will void
the manufacturer's warranty and will further relieve the
manufacturer of responsibility for personal injury or
property damage resulting therefrom.
(3) Many electrical and mechanical parts in the products have
special
safety-related
characteristics.
These
characteristics are often not evident from visual inspection
nor can the protection afforded by them necessarily be
obtained by using replacement components rated for
higher voltage, wattage, etc. Replacement parts which
have these special safety characteristics are identified in
the parts list of Service manual. Electrical components
having such features are identified by shading on the
schematics and by (
) on the parts list in Service
manual. The use of a substitute replacement which does
not
have
the
same
safety
characteristics
as
the
recommended replacement part shown in the parts list of
Service manual may cause shock, fire, or other hazards.
(4) Don't short between the LIVE side ground and
ISOLATED (NEUTRAL) side ground or EARTH side
ground when repairing.
Some model's power circuit is partly different in the GND.
The difference of the GND is shown by the LIVE : (
) side
GND, the ISOLATED (NEUTRAL) : (
) side GND and
EARTH : (
) side GND.
Don't short between the LIVE side GND and ISOLATED
(NEUTRAL) side GND or EARTH side GND and never
measure the LIVE side GND and ISOLATED (NEUTRAL)
side GND or EARTH side GND at the same time with a
measuring apparatus (oscilloscope etc.). If above note will
not be kept, a fuse or any parts will be broken.
(5) If any repair has been made to the chassis, it is
recommended that the B1 setting should be checked or
adjusted (See B1 POWER SUPPLY check).
(6) The high voltage applied to the picture tube must conform
with that specified in Service manual. Excessive high
voltage can cause an increase in X-Ray emission, arcing
and possible component damage, therefore operation
under excessive high voltage conditions should be kept to
a minimum, or should be prevented. If severe arcing
occurs, remove the AC power immediately and determine
the cause by visual inspection (incorrect installation,
cracked or melted high voltage harness, poor soldering,
etc.). To maintain the proper minimum level of soft X-Ray
emission, components in the high voltage circuitry
including the picture tube must be the exact replacements
or alternatives approved by the manufacturer of the
complete product.
(7) Do not check high voltage by drawing an arc. Use a high
voltage meter or a high voltage probe with a VTVM.
Discharge the picture tube before attempting meter
connection, by connecting a clip lead to the ground frame
and connecting the other end of the lead through a 10k
2W resistor to the anode button.
(8) 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.
(9) 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 0.15
µF AC-type capacitor
between an exposed metal part and a known good earth
ground (water pipe, etc.). Measure the AC voltage
across the resistor with the AC voltmeter. Move the
resistor connection to each exposed metal part,
particularly any exposed metal part having a return path
to the chassis, and measure the AC voltage across the
resistor. Now, reverse the plug in the AC outlet and
repeat each measurement. Any voltage measured must
not exceed 0.75V AC (r.m.s.). This corresponds to
0.5mA AC (r.m.s.).
However, in tropical area, this must not exceed 0.3V AC
(r.m.s.). This corresponds to 0.2mA AC (r.m.s.).
AC VOLTMETER
(HAVING 1000 /V,
OR MORE SENSITIVITY)
PLACE THIS PROBE
ON EACH EXPOSED
METAL PART
1500
10W
0.15 F AC-TYPE
GOOD EARTH GROUND