JVC LT-32SH6/A User manual

SERVICE MANUAL
COPYRIGHT © 2006 Victor Company of Japan, Limited No.YA382
2006/7
LCD FLAT TELEVISION
YA38220067
LT-32SH6/A,
LT-37SH6/A
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16
[LT-37SH6/A]

1-2 (No.YA382)
SPECIFICATION
NOTE : Design & specifications are subject to change without notice.
Item Contents
LT-32SH6 LT-37SH6
Dimensions (W ×H ×D) 80.8 cm ×55.9 cm ×10.8 cm (TV only)
80.8 cm ×62.8 cm ×30.9 cm (Included Stand)
92.6 cm ×63.2 cm ×10.9 cm (TV only)
92.6 cm ×70.1 cm ×32.5 cm (Included Stand)
Mass 20.0 kg (Included Stand) 27.2 kg (Included Stand)
Power Input AC 240V, 50Hz
Power Consumption 168W (Stand-by : 1W) 217W (Stand-by : 1W)
TV RF System Analogue
Digital
CCIR (B/G)
DVB-T
Color System PAL
Stereo System A2/NICAM system, Digital (MPEG2)
Receiving
Frequency
Analogue
Digital
48.25 MHz - 863.25 MHz
174 MHz - 858 MHz
Intermediate
Frequency
VIF
SIF
38.9MHz (B/G)
33.4MHz (5.5MHz :B/G)
Colour Sub
Carrier Frequency
PAL
SECAM
NTSC
4.43MHz
4.40625MHz / 4.25MHz
4.43MHz
Teletext System FLOF (Fastext), WST(World Standard system)
LCD Panel 32V wide aspect (16 : 9) 37V wide aspect (16 : 9)
Screen Size Diagonal : 80 cm (H: 69.7 cm ×V: 39.2 cm) Diagonal : 94.9 cm (H: 82.6 cm ×V: 46.7 cm)
Display Pixels Horizontal : 1366 pixels ×Vertical : 768 pixels (W-XGA)
Audio Power Output 10W + 10W
Speaker 6.6cm round type ×2 6.6cm round type ×4
Aerial terminal (VHF/UHF) 75 Ωunbalanced, coaxial
Video / Audio
Input-1/2
Component Video
[Input-2]
750p / 1125i
625p / 625i
S-Video
[Input-1]
Video
Audio
RCA pin jack ×3
Y : 1V (p-p) (Sync signal: ±0.35V(p-p), 3-value sync.), 75 Ω
Pb/Pr : ±0.35V(p-p), 75 Ω
Y : 1V (p-p), Positive (Negative sync provided), 75 Ω
Pb/Pr : 0.7V(p-p), 75 Ω
Mini-DIN 4 pin connector ×1
Y: 1V (p-p), Positive (Negative sync provided), 75 Ω
C: 0.286V (p-p) (Burst signal), 75 Ω
1V (p-p), Positive (Negative sync provided), 75 Ω, RCA pin jack ×1
500mV (rms), High impedance, RCA pin jack ×4
Video / Audio
Output
[DTV ONLY]
Video
Audio
1V (p-p), Positive (Negative sync provided), 75 Ω, RCA pin jack ×1
500mV (rms), Low impedance, RCA pin jack ×2
PC (RGB) Input Video
Audio
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)
500mV (rms), Low impedance, RCA pin jack ×2
Digital Audio Output Opticl Connector ×1
Headphone 3.5mm mini jack ×1 (Stereo)
Remote Control Unit RM-C1896 (AA/R6 battery ×2)
AC Adapter DA-E056705025

(No.YA382)1-3
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) 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 10kΩ
2W resistor to the anode button.
(7) Isolation Check (Safety for Electrical Shock Hazard)
After re-assembling the product, always perform an isola-
tion check on the exposed metal parts of the cabinet (an-
tenna terminals, video/audio input and output terminals,
Control knobs, metal cabinet, screw heads, earphone jack,
control shafts, etc.) to be sure the product is safe to operate
without danger of electrical shock.
a) Dielectric Strength Test
The isolation between the AC primary circuit and all metal
parts exposed to the user, particularly any exposed metal
part having a return path to the chassis should withstand a
voltage of 3000V AC (r.m.s.) for a period of one second. (.
. . . Withstand a voltage of 1100V AC (r.m.s.) to an
appliance rated up to 120V, and 3000V AC (r.m.s.) to an
appliance rated 200V or more, for a period of one second.)
This method of test requires a test equipment not generally
found in the service trade.
b) Leakage Current Check
Plug the AC line cord directly into the AC outlet (do not use
a line isolation transformer during this check.). Using a
"Leakage Current Tester", measure the leakage current
from each exposed metal part of the cabinet, particularly
any exposed metal part having a return path to the chassis,
to a known good earth ground (water pipe, etc.). Any
leakage current must not exceed 0.5mA AC (r.m.s.).
However, in tropical area, this must not exceed 0.2mA AC
(r.m.s.).
Alternate Check Method
Plug the AC line cord directly into the AC outlet (do not
use a line isolation transformer during this check.). Use
an AC voltmeter having 1000Ωper volt or more
sensitivity in the following manner. Connect a 1500Ω
10W resistor paralleled by a 0.15µF AC-type capacitor
between an exposed metal part and a known good earth
ground (water pipe, etc.). Measure the AC voltage
across the resistor with the AC voltmeter. Move the
resistor connection to each exposed metal part,
particularly any exposed metal part having a return path
to the chassis, and measure the AC voltage across the
resistor. Now, reverse the plug in the AC outlet and
repeat each measurement. Any voltage measured must
not exceed 0.75V AC (r.m.s.). This corresponds to
0.5mA AC (r.m.s.).
However, in tropical area, this must not exceed 0.3V AC
(r.m.s.). This corresponds to 0.2mA AC (r.m.s.).
AC VOLTMETER
(HAVING 1000 /V,
OR MORE SENSITIVITY)
PLACE THIS PROBE
ON EACH EXPOSED
METAL PART
1500 10W
0.15 F AC-TYPE
GOOD EARTH GROUND

1-4 (No.YA382)
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.
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.
Install the unit on stable flooring or stands.
Take precautionary measures to prevent the unit from tipping in order to protect against accidents and earthquakes.
1.3 PRECAUTIONS
(1) The picture brightness may become uneven on the entire screen according to the environmental temperature. Be sure to use
your monitor set in a specified temperature range for proper display presentation.
(2) Avoid disturbing the heat dissipation from the vent holes provided in the rear, on the top and at the sides. Failure to do so may
result in damaged electronics inside due to the accumulated heat within the unit.
(3) Be sure to install the unit in a well-ventilated place. Also make sure that the ambient temperature is kept in the range of 0 to 35°C.
(4) Avoid operation or storage in high temperature and humidity that exceed the specified limit. Otherwise, the display presentation
may be deteriorated.
(5) This monitor may display a blurred picture when exposed to an extreme environmental conditions. This phenomenon is due to
an intrinsic characteristic of the Liquid Crystal Display (LCD). This is not the failure.
(6) This monitor display uses a Cold Cathode Tube as a backlighting device. The brilliance of this tube (and the monitor display)
may be degraded by time.
1.4 CAUTIONS FOR TRANSPORTATION
The goods may be damaged during transportation caused by poor handling such as throwing, toppling, dropping, etc, giving an excess
force against the LCD device. This may happen even if the packing is rigid and secured. To avoid such adverse situations, give a
proper instruction to the freighter for secured handling. The LCD panel uses a glass plate, which is very fragile against an external
force. Take utmost care to avoid vibration or shock to the panel.
200 mm 200 mm
50 mm
150 mm 150 mm
Distance recommendations
Avoid improper installation and never position the unit where good ventilation
is impossible.
When installing this TV, distance recommendations must be maintained
between the set and the wall, as well as inside a tightly enclosed area or
piece of furniture.
Keep to the minimum distance guidelines shown for safe operation.

(No.YA382)1-5
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
2.1 ABOUT LIQUID CRYSTAL DISPLAY
2.1.1 STRUCTURE OF LIQUID CRYSTAL PANEL
The Liquid Crystal Display used for this unit is of a TFT (Thin Film Transistor) type panel. The structure of this panel is that a TFT
array-formed substrate and the stripe pixel matrix type color filter substrate are pressed together with a liquid crystal filled in between
these materials.
2.1.2 LONG-TERM AFTERIMAGE ON THE LCD
A minute amount of ionic material could be mingled into a liquid crystal substrate in the manufacturing process. By applying the
electricity to the panel the ionic material may be migrated towards one part of the electrodes, causing a long-term afterimage to be
displayed. In practice, when a still image is displayed for a long time, the afterimage may be developed and persisted. To cure this
problem, turn off the unit and then turn on again and arrange displaying an appropriate still image on the portion where the afterimage
is being superimposed.
2.1.3 RESPONSE SPEED OF THE LCD
The LCD is slower than the CRT in terms of the display refresh rate, causing a fast moving picture may be displayed blurred. This is
not fault but caused by an intrinsic characteristic of the LCD.
2.1.4 VIEWING ANGLE OF THE LCD
This LCD uses a wide-angle liquid crystal panel, featuring a low rate of the brightness inversion. When viewed from a far outer angle,
the screen may be displayed with hue variation. Again, this is not fault but caused by an intrinsic characteristic of the LCD.
2.1.5 PIXEL DEFICIENCY OF THE LCD
The liquid crystal panel is manufactured with precise engineering procedure. However, there is a possibility of yielding a little amount
of defective pixels in part on the panel. This is unavoidable feature even if the latest technology is being used for manufacturing the
LCD module.
2.2 IMPORTANT NOTICE WHEN REPLACING COMPONENT PARTS
2.2.1 REPLACING THE LCD MODULE
(1) The LCD panel is fragile against the static charge. Be sure to take an appropriate grounding using a grounding-strap etc. when
to replace the LCD panel.
(2) The LCD is made of glass, which is fragile against the mechanical shock. Use utmost care when handling the LCD panel.
(3) When replacing the panel, first place the panel on the base chassis and then make sure that there is no gap in between the panel
and the chassis. Fix the panel with fixing screws. Turn the unit on with an all-black signal being put in and check if the brightness
is even on the entire screen. If the brightness is not even in some part, slacken the fixing screw nearby until the brightness
becomes even with other parts.
(4) A tightening torque for the fixing screws must be set to 0.294Nm or the less. Applying the torque larger than this limit may result
in the damage on the LCD panel.
(5) Connecting or disconnecting the plugs with the set is being powered may cause the malfunction of the set. Makes sure that the
AC power plug is disconnected from the power source when attempting the replacement work.
2.2.2 REPLACING THE FUSE
Be sure to use the rated fuse. After replacing the fuse, confirm that the insulator is stuck on the shielding surface for secure insulation.

1-6 (No.YA382)
SECTION 3
DISASSEMBLY
3.1 CAUTION AT DISASSEMBLY:
• 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 [LT-32SH6/A]
3.2.1 REMOVING THE STAND (Fig.1)
(1) Remove the 2 screws [A], then remove the STAND COVER.
(2) Remove the 4 screws [B], then 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 [C], the 4 screws [D], and the 1 screw [E].
(3) Remove the REAR COVER.
3.2.3 REMOVING THE POWER CORD HOLDER AND SD
CARD BASE (Fig.1)
• Remove the STAND.
• Remove the REAR COVER.
(1) Remove the 2 screws [F], then remove the POWER CORD
HOLDER.
(2) Remove the 1 screw [G], then remove the SD CARD BASE.
3.2.4 REMOVING THE MAIN PWB (Fig.1)
• Remove the STAND.
• Remove the REAR COVER.
(1) Remove the 4 screws [H], then remove the MAIN PWB SHIELD.
(2) Remove the 3 screws [J], then remove the TERMINAL BASE.
(3) Remove the 7 screws [K], then remove the MAIN PWB.
3.2.5 REMOVING THE POWER PWB (Fig.1)
• Remove the STAND.
• Remove the REAR COVER.
(1) Remove the 5 screws [L], then remove the FAN BRACKET.
(2) Remove the 6 screws [M], then remove the POWER PWB.
3.2.6 REMOVING THE DVB PWB (Fig.1)
• Remove the STAND.
• Remove the REAR COVER.
(1) Remove the 3 screws [N], then remove the TUNER BASE.
(2) Remove the 1 screw [P] and the 2 screws [Q], then remove
the DVB PWB SHIELD.
(3) Remove the 5 screws [R], then remove the DVB PWB.
3.2.7 REMOVING THE KEY PWB (Fig.1)
• Remove the STAND.
• Remove the REAR COVER.
(1) Remove the 2 screws [S], then remove the KEY PWB.
(2) Remove the 2 screws [T], then remove the CONTROL ASS'Y.

(No.YA382)1-7
Fig.1
A
C
C
JACK COVER
E
JACK COVER
D
C
N
TUNER
BASE
DVB PWB
G
SD CARD BASE
POWER
CORD
HOLDER
F
POWER PWB
MAIN PWB
TERMINAL BASE
J
CONTROL
ASS'Y
T
KEY
PWB
REAR COVER
FAN BRACKET
MALAR
MAIN PWB
SHIELD
DVB PWB
SHIELD
MALAR
STAND COVER
STAND
FRONT
B
S
M
H
K
Q
R
P
L

1-8 (No.YA382)
3.2.8 REMOVING THE SPEAKER (Fig.2)
• Remove the STAND.
• Remove the REAR COVER.
(1) Remove the 7 screws [A], then remove the SPEAKER BOX.
(2) Remove the 4 screws [B], then remove the SPEAKER (L/R).
(3) Remove the 4 screws [C], then remove the DUCT(L/R).
NOTE:
Since the speaker is attached in a certain direction, attach
the speaker in the same correct direction as it has been at-
tached.
3.2.9 REMOVING THE LCD PANEL UNIT (Fig.2)
• Remove the STAND.
• Remove the REAR COVER.
• Remove the POWER CORD HOLDER.
• Remove the MAIN PWB.
• Remove the POWER PWB.
• Remove the DVB PWB.
(1) Remove the 10 screws [D] and 1 screw [E], then remove
the MAIN BASE.
(2) Remove the 7 screws [F], then remove the LCD PANEL
UNIT whit the TOP FRAME and BOTTOM FRAME.
(3) Remove the 4 screws [G], then remove the TOP FRAME
and BOTTOM FRAME from the LCD PANEL UNIT.
3.2.10 REMOVING THE IR PWB (Fig.2)
• Remove the STAND.
• Remove the REAR COVER.
(1) Remove the 2 screws [H], then remove the IR PWB.
3.2.11 REMOVING THE LED LENS (Fig.2)
• Remove the STAND.
• Remove the REAR COVER.
• Remove the IR PWB.
(1) Remove the 2 screws [J], then remove the LED LENS.

(No.YA382)1-9
Fig.2
SPEAKER
MAIN BASE
IR PWB
LCD PANEL UNIT
SPEAKER
LED LENS
FRONT PANEL
SPEAKER BOX
DUCT
DUCT
TOP FRAME
BOTTOM
FRAME
F
D
E
G
A
F
G
H
C
C
B
BJ
FRONT
FRONT

1-10 (No.YA382)
3.3 DISASSEMBLY PROCEDURE [LT-37SH6/A]
3.3.1 REMOVING THE STAND (Fig.3)
(1) Remove the 1 screw [A], then remove the STAND COVER.
(2) Remove the 4 screws [B], then 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 8 screws [C], the 3 screws [D], the 2 screws [E] and
the 2 screws [F].
(3) Remove the REAR COVER.
3.3.3 REMOVING THE POWER CORD HOLDER AND SD
CARD BASE (Fig.3)
• Remove the STAND.
• Remove the REAR COVER.
(1) Remove the 2 screws [G], then remove the POWER
CORD HOLDER.
(2) Remove the 2 screws [H], then remove the SD CARD BASE.
3.3.4 REMOVING THE MAIN PWB (Fig.3)
• Remove the STAND.
• Remove the REAR COVER.
(1) Remove the 6 screws [J], then remove the MAIN PWB SHIELD.
(2) Remove the 3 screws [K], then remove the TERMINAL BASE.
(3) Remove the 7 screws [L], then remove the MAIN PWB.
3.3.5 REMOVING THE POWER PWB (Fig.3)
• Remove the STAND.
• Remove the REAR COVER.
(1) Remove the 5 screws [M], then remove the FAN BRACKET.
(2) Remove the 6 screws [N], then remove the POWER PWB.
3.3.6 REMOVING THE DVB PWB (Fig.3)
• Remove the STAND.
• Remove the REAR COVER.
(1) Remove the 3 screws [P], then remove the TUNER BASE.
(2) Remove the 2 screws [Q], then remove the DVB PWB SHIELD.
(3) Remove the 5 screws [R], then remove the DVB PWB.
3.3.7 REMOVING THE KEY PWB (Fig.3)
• Remove the STAND.
• Remove the REAR COVER.
(1) Remove the 2 screws [S], then remove the KEY PWB.
(2) Remove the 2 screws [T], then remove the CONTROL ASS'Y.

(No.YA382)1-11
Fig.3
G
K
S
J
T
N
H
R
P
L
Q
M
E
C
A
B
D
C
REAR COVER
JACK COVER
JACK COVER
STAND COVER
STAND
MAIN PWB
TERMINAL BASE
POWER
CORD
HOLDER
POWER PWB
TUNER BASE
DVB PWB
SD CARD
BASE
KEY PWB
CONTROL
ASS'Y
F
FAN BRACKET
MALAR
MALAR
MAIN PWB
SHIELD
DVB PWB
SHIELD
FRONT

1-12 (No.YA382)
3.3.8 REMOVING THE SPEAKER (Fig.4)
• Remove the STAND.
• Remove the REAR COVER.
(1) Remove the 6 screws [A] and 6 spacers [B], then remove
the SPEAKER (L/R).
NOTE:
Since the speaker is attached in a certain direction, attach
the speaker in the same correct direction as it has been at-
tached.
3.3.9 REMOVING THE LCD PANEL UNIT (Fig.4)
• Remove the STAND.
• Remove the REAR COVER.
• Remove the POWER CORD HOLDER.
• Remove the MAIN PWB.
• Remove the POWER PWB.
• Remove the DVB PWB.
(1) Remove the 10 screws [C] and 1 screw [D], then remove
the MAIN BASE.
(2) Remove the 2 screws [E], 2 screws [F] and 3 screws [G],
then remove the TOP FRAME.
(3) Remove the 1 screw [H], then remove the SD CARD PWB
BRACKET.
(4) Remove the 3 screws [J] and 2 screws [K], then remove
the BOTTOM FRAME.
(5) Remove the LCD PANEL from the FRONT PANEL.
3.3.10 REMOVING THE IR PWB (Fig.4)
• Remove the STAND.
• Remove the REAR COVER.
(1) Remove the 2 screws [L], then remove the IR PWB.
3.3.11 REMOVING THE LED LENS (Fig.4)
• Remove the STAND.
• Remove the REAR COVER.
• Remove the IR PWB.
(1) Remove the 2 screws [M], then remove the LED LENS.

(No.YA382)1-13
Fig.4
IR PWB
LED
LENS
SPEAKER
SPEAKER
FRONT PANEL
LCD PANEL UNIT
C
D
F
G
EH
J
K
A
B
B
L
M
A
B
B
TOP FRAME
SD CARD PWB
BRACKET
BOTTOM
FRAME
MAIN BASE
FRONT

1-14 (No.YA382)
3.4 REPLACEMENT OF CHIP COMPONENT
3.4.1 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.
3.4.2 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.
3.4.3 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.YA382)1-15
SECTION 4
ADJUSTMENT
This service manual does not describe ADJUSTMENT.

1-16 (No.YA382)
SECTION 5
TROUBLESHOOTING
The Ver. or Hor. sync
does not hold
Tighten flex cable
at P003
End
Are the output of
SVP-EX52
(CLK, H, V, DE)
normal
Are flex cable
attached firmly
at P003
Are the input
waveforms of
SVP-EX52 normal
Tighten two flex
cables at P003
Replace V901
(LCD panel)
Are flex cable
attached firmly at
the LCD panel
connectors
Replace I037
(SVP-EX52)
End End
End
Replace I025
Replace I009
Replace I028
The Voltage of
I001 #2 is 5V
The Voltage of
I025 #2 is 3.3V
The Voltage of
I009 #2 is 3.3V
The Voltage of
I028 #2 is 2.5V
Next
Replace I001
YES
YES
YES
YES
End
NO
NO
NO
NO
Replace I037
(SVP-EX52)
The Voltage of
I019 #2 is 3.3V
The Voltage of
I004 #2 is 1.8V
The Voltage of
I003 #2 is 1.8V
YES
YES
YES
Replace I004
Replace I003
NO
NO
NO
Replace I019
No picture appwear
Replace P807
Replace PSU1
Replace P002A
Check I013
socketis
loosened
Replace I013
Restart PC signal
to ensure H.V. sync
are not absent
Reset the
MCU (I016)
Replace I016
MCU (I016) Hangs
Next
End
End
End
The Voltage of
I013 #36 is 5V
The Voltage of
P002 #3 #4 is 5V
Does the LED
light up
LED display is
amber
Is it entering into
power saving mode
Check if the Power
Cord has been well
connected to TV?
Is the input voltage
applied to Power
supply unit?
(Cnl #3 #4 is 5V)
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
Picture
shows
Still no
Picture

(No.YA382)
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

LT-32SH6/A,
LT-37SH6/A
[LT-37SH6/A]
LCD FLAT TELEVISION
CD-ROM No.SML200607
COPYRIGHT © 2006 Victor Company of Japan, Limited. No.YA382
2006/7
SCHEMATIC DIAGRAMS

5.NOTE FOR REPAIRING SERVICE
This model's power circuit is partly different in the GND. The
difference of the GND is shown by the LIVE : ( ) side GND and the
ISOLATED(NEUTRAL): ( ) side GND. Therefore, care must be
taken for the following points.
(1)Do not touch the LIVE side GND or the LIVE side GND and the
ISOLATED(NEUTRAL)side GND simultaneously. if the above
caution is not respected, an electric shock may be caused.
Therefore, make sure that the power cord is surely removed from
the receptacle when, for example, the chassis is pulled out.
(2)Do not short between the LIVE side GND and ISOLATED(NEUTRAL)
side GND or never measure with a measuring apparatus measure
with a measuring apparatus ( oscilloscope, etc.) the LIVE side GND
and ISOLATED(NEUTRAL)side GND at the same time.
If the above precaution is not respected, a fuse or any parts will be broken.
Since the circuit diagram is a standard one, the circuit and
circuit constants may be subject to change for improvement
without any notice.
NOTE
Due improvement in performance, some part numbers show
in the circuit diagram may not agree with those indicated in
the part list.
When ordering parts, please use the numbers that appear
in the Parts List.
STANDARD CIRCUIT DIAGRAM
NOTE ON USING CIRCUIT DIAGRAMS
(7)Ground symbol
: LIVE side ground
: ISOLATED(NEUTRAL)side ground
: EARTH ground
: DIGITAL ground
(6)Connecting method
: Connector : Wrapping or soldering
: Receptacle
(5)Test point
: Test point : Only test point display
Respective voltage values are indicated
: B1
: 9V : 5V
: B2 (12V)
(4)Power Supply
Type
MM : Metalized mylar capacitor
PP : Polypropylene capacitor
MPP : Metalized polypropylene capacitor
MF : Metalized film capacitor
TF : Thin film capacitor
BP : Bipolar electrolytic capacitor
TAN : Tantalum capacitor
(3)Coils
No unit
Others
: [µH]
: As specified
No indication : Ceramic capacitor
(2)Capacitors
Capacitance value
1 or higher : [pF]
less than 1 : [µF]
Withstand voltage
No indication : DC50[V]
Others : DC withstand voltage [V]
AC indicated : AC withstand voltage [V]
Electrolytic Capacitors
47/50[Example]: Capacitance value [µF]/withstand voltage[V]
Composition resistor 1/2 [W] is specified as 1/2S or Comp.
Type
No indication : Carbon resistor
OMR : Oxide metal film resistor
MFR : Metal film resistor
MPR : Metal plate resistor
UNFR : Uninflammable resistor
FR : Fusible resistor
4.INDICATIONS ON THE CIRCUIT DIAGRAM
(1)Resistors
Resistance value
No unit : [Ω]
K: [kΩ]
M
Rated allowable power
No indication : 1/16 [W]
Others : As specified
: [MΩ]
3.INDICATION OF PARTS SYMBOL [EXAMPLE]
In the PW board : R1209 R209
1.SAFETY
The components identified by the symbol and shading are
critical for safety. For continued safety replace safety ciritical
components only with manufactures recommended parts.
Since the voltage values of signal circuit vary to some extent
according to adjustments, use them as reference values.
2.SPECIFIED VOLTAGE AND WAVEFORM VALUES
The voltage and waveform values have been measured under the
following conditions.
(1)Input signal : Colour bar signal
(2)Setting positions of
each knob/button and
variable resistor
(3)Internal resistance of tester : DC 20kΩ/V
(4)Oscilloscope sweeping time : H 20µs / div
: V 5ms / div
: Othters Sweeping time is
specified
(5)Voltage values : All DC voltage values
: Original setting position
when shipped
LT-32SH6/A, LT-37SH6/A
(No.YA382)2-1

SEMICONDUCTOR SHAPES
CONTENTS
USING P.W.BOARD ....................................................................................... 2-2
SEMICONDUCTOR SHAPES ...................................................................... 2-2
BLOCK DIAGRAM ........................................................................................ 2-3
CIRCUIT DIAGRAMS .................................................................................... 2-5
MAIN PWB CIRCUIT DIAGRAM ................................................................................................................ 2-5
IR PWB CIRCUIT DIAGRAM .................................................................................................................... 2-31
KEY PWB CIRCUIT DIAGRAM ................................................................................................................. 2-33
PATTERN DIAGRAMS .............................................................................. 2-35
MAIN PWB PATTERN .............................................................................................................................. 2-35
IR PWB PATTERN .................................................................................................................................... 2-37
KEY PWB PATTERN ................................................................................................................................ 2-37
USING P.W. BOARD
IC
BOTTOM VIEW FRONT VIEW TOP VIEW
1 N
N
1
OUT
E
IN
IN OUTE
1 N
TOP VIEW
N
1
N
N
N
1
N
CHIP IC
TRANSISTOR
BOTTOM VIEW FRONT VIEW TOP VIEW
CHIP TR
E
C
B
ECB
C
BE
B
(G)
E
(S)
C
(D)
ECB
ECB
PWB ASS'Y name LT-32SH6/A LT-37SH6/A
MAIN P.W. BOARD
DA-5097661600(PWB-0983-C) DA-5097661601(PWB-0983-C)
DA-5097661701(PWB-0984-C)
IR P.W. BOARD DA-5097661700(PWB-0984-C)
KEY P.W. BOARD DA-5097663300(PWB-0994-C) DA-5097663301(PWB-0994-C)
2-2(No.YA382)