Sharp LC-10A3U User manual

LC-10A3U
SUPPLEMENT
SERVICE MANUAL
In the interests of user-safety (Required by safety regulations in some countries) the set should be restored
to its original condition and only parts identical to those specified should be used.
MODEL
CONTENTS
»IMPORTANT SERVICE SAFETY PRECAUTION.................................................................................... 2
»SPECIFICATIONS ................................................................................................................................... 5
»OPERATION MANUAL............................................................................................................................ 6
»DIMENSIONS .......................................................................................................................................... 7
»REMOVING OF MAJOR PARTS ............................................................................................................. 8
»ADJUSTING PROCEDURE OF EACH SECTION ................................................................................ 11
»TROUBLE SHOOTING TABLE .............................................................................................................. 14
»CHASSIS LAYOUT ................................................................................................................................ 18
»BLOCK DIAGRAM ................................................................................................................................. 20
»OVERALL WIRING DIAGRAM .............................................................................................................. 22
»DESCRIPTION OF SCHEMATIC DIAGRAM ........................................................................................ 24
»SCHEMATIC DIAGRAM ........................................................................................................................ 25
»PRINTED WIRING BOARD ASSEMBLIES ........................................................................................... 32
»PARTS LIST........................................................................................................................................... 39
»PACKING OF THE SET ......................................................................................................................... 49
Page
SHARP CORPORATION This document has been published to be used for
after sales service only.
The contents are subject to change without notice.
LCD COLORTELEVISION
LC-10A3U
OUTLINE
The 10"LCD panel used in the LC-10A3U has been redsigned as from the October 2002 production.
Accordingly, the circuitly, LCD panel and its peripheral parts have been partially changed.
This Service manual covers all the changes.
How to identify the newly designed sets
(1) The marking A is given on the model label at the bottom of the set.
(2) Serial numbers
210451112~
OCTOBER2002~
(3) The marking "A" is given on the label at the packing case.
SHARP CORPORATION
MADE IN JAPAN
FABRIQUÉ AU JAPON
LCD COLOR TV
MODEL
MODÉLE
ELECTRICAL RATING
DC 12V 24W
CONSOMMATION
CC 12V 24W
LC-10A3U-S A
SERIAL NO. 210451112
N DE SERIE
MANUFACTURED OCTOBER 2002
DATE DE PRODUCTION OCTOBER 2002
A Mark
SUPPLEMENT SX2T7LC-10A3U

2
LC-10A3U
SUPPLEMENT
CAUTION: FOR CONTINUED
PROTECTION AGAINST A RISK OF
FIRE REPLACE ONLY WITH SAME
TYPE F3701 (1.6A, 125V),
F3702(1.6A, 125V) AND F3751
(2.5A, 125V) FUSE.
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SAFETY NOTICE
Many electrical and mechanical parts in LCD television
have special safety-related characteristics.
These characteristics are often not evident from visual
inspection, nor can protection afforded by them be
necessarily increased by using replacement components
rated for higher voltage, wattage, etc.
Replacement parts which have these special safety
characteristics are identified in this manual; electrical
components having such features are identified by “ å”
IMPORTANT SERVICE SAFETY PRECAUTION
ËService work should be perfomed only by qualified service technicians who are thor-
oughly familiar with all safety checks and the servicing guidelines which follow:
and shaded areas in the Replacement Parts Lists and
Schematic Diagrams .
For continued protection, replacement parts must be
identical to those used in the original circuit.
The use of a substitute replacement parts which do not
have the same safety characteristics as the factory
recommended replacement parts shown in this service
manual, may create shock, fire or other hazards.
WARNING
1. For continued safety, no modification of any circuit
should be attempted.
2. Disconnect AC power before servicing.
BEFORE RETURNINGTHE RECEIVER
(Fire & Shock Hazard)
Before returning the receiver to the user, perform
the following safety checks:
1. Inspect all lead dress to make certain that leads are
not pinched, and check that hardware is not lodged
between the chassis and other metal parts in the
receiver.
2. Inspect all protective devices such as non-metallic
control knobs, insulation materials, cabinet backs,
adjustment and compartment covers or shields,
isolation resistor-capacitor networks, mechanical
insulators, etc.
3. To be sure that no shock hazard exists, check for
leakage current in the following manner.
•Plug the AC cord directly into a 110~240 volt AC outlet,
and connect the DC power cable into the receiver's
DC jack.(Do not use an isolation transformer for this
test).
•Using two clip leads, connect a 50k ohm, 10 watt
resistor paralleled by a 0.15µF capacitor in series with
all exposed metal cabinet parts and a known earth
ground, such as electrical conduit or electrical ground
connected to an earth ground.
•Use an AC voltmeter having with 5000 ohm per volt, or
higher, sensitivity or measure the AC voltage drop
across the resisor.
•Connect the resistor connection to all exposed metal
parts having a return to the chassis (antenna, metal
cabinet, screw heads, knobs and control shafts,
escutcheon, etc.) and measure the AC voltage drop
across the resistor.
All checks must be repeated with the AC cord plug
connection reversed. (If necessary, a nonpolarized
adaptor plug must be used only for the purpose of
completing these checks.)
Any reading of 0.75V peak (this corresponds to 0.5
milliamp.peak AC.) or more is excessive and indicates
a potential shock hazard which must be corrected
before returning the monitor to the owner.
A V
DVM
AC SCALE
50k ohm
10W
0.15 µF
TEST PROBE
TO EXPOSED
METAL PARTS CONNECT TO
KNOWN EARTH
GROUND

3
LC-10A3U
SUPPLEMENT
PRECAUTION: POUR LA
PROTECTION CONTINUE CONTRE
LES RISQUES D'INCENDIE,
REMPLACER LE FUSIBLE PAR UN
FUSIBLE DE MEME TYPE F3701
(1.6A, 125V), F3702 (1.6A, 125V),
F3751(2.5A, 125V).
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AVIS POUR LA SECURITE
De nombreuses pièces, électriques et mécaniques, dans
les téléviseurs présentent des caractéristiques spéciales
relatives àla sécurité, qui ne sont souvent pas évidentes
àvue. Le degréde protection ne peut pas être
nécessairement augmentée en utilisant des pièces de
remplacement étalonnées pour haute tension,
puissance, etc.
Les pièces de remplacement qui présentent ces
caractéristiques sont identifiées dans ce manuel; les
pièces électriques qui présentent ces particularités sont
PRECAUTIONS A PRENDRE LORS DE LA REPARATION
ËNe peut effectuer la réparation qu' un technicien spécialiséqui s'est parfaitement
accoutuméàtoute vérification de sécuritéet aux conseils suivants.
identifiées par la marque " å" et hachurées dans la
liste des pièces de remplacement et les diagrammes
schématiques.
Pour assurer la protection, ces pièces doivent être
identiques àcelles utilisées dans le circuit d'origine.
L'utilisation de pièces qui n'ont pas les mêmes
caractéristiques que les pièces recommandées par
l'usine, indiquées dans ce manuel, peut provoquer des
électrocutions, incendies, radiations X ou autres
accidents.
AVERTISSEMENT
1. N'entreprendre aucune modification de tout circuit.
C'est dangereux.
2. Débrancher le récepteur avant toute réparation.
VERIFICATIONS CONTRE L'INCEN-DIE ET
LE CHOC ELECTRIQUE
Avant de rendre le récepteur àl'utilisateur, effectuer
les vérifications suivantes.
1. Inspecter tous les faisceaux de câbles pour s'assurer
que les fils ne soient pas pincés ou qu'un outil ne soit
pas placéentre le châssis et les autres pièces
métalliques du récepteur.
2. Inspecter tous les dispositifs de protection comme les
boutons de commande non-métalliques, les isolants,
ledosducoffret,lescouverclesou blindagesderéglage
et de compartiment, les réseaux de résistance-
capacité, les isolateurs mécaniques, etc.
3. S'assurer qu'il n'y ait pas de danger d'électrocution en
vérifiant la fuite de courant, de la facon suivante:
•Brancher le cordon d'alimentation directem-ent àune
prise de courant de 110-240V. (Ne pas utiliser de
transformateur d'isolation pour cet essai).
•A l'aide de deux fils àpinces, brancher une résistance
de 50 kΩ10 watts en parallèle avec un condensateur
de 0,15µF en série avec toutes les pièces métalliques
exposées du coffret et une terre connue comme une
conduite électrique ou une prise de terre branchée à
la terre.
•Utiliser un voltmètre CA d'une sensibilitéd'au moins
5000Ω/V pour mesurer la chute de tension en travers
de la résistance.
•Toucher avec la sonde d'essai les pièces métalliques
exposées qui présentent une voie de retour au châssis
(antenne, coffret métallique, tête des vis, arbres de
commande et des boutons, écusson, etc.) et mesurer
la chute de tension CA en-travers de la résistance.
Toutes les vérifications doivent être refaites après avoir
inversélafiche du cordon d'alimentation.(Sinécessaire,
une prise d'adpatation non polarisée peut être utilisée
dans le but de terminer ces vérifications.)
Tous les courants mesurés ne doivent pas dépasser
0,5 mA.
Dans le cas contraire, il y a une possibilitéde choc
électrique qui doit être supprimée avant de rendre le
récepteur au client.
A V
VTVM
ECHELLE CA
50k ohm
10W
0.15 µF
SONDE D'ESSAI
AUX PIECES
METALLIQUES
EXPOSEES
BRANCHER A UNE
TERRE CONNUE

4
LC-10A3U
SUPPLEMENT
Precautions for using lead-free solder
1 Employing lead-free solder
"Main PWB" of this model employs lead-free solder.The LF symbol indicates lead-free solder, and is attached
on the PWBs and service manuals.The alphabetical character following LF shows the type of lead-free solder.
Example:
2 Using lead-free wire solder
When fixing the PWB soldered with the lead-free solder, apply lead-free wire solder.Repairing with conventional
lead wire solder may cause damage or accident due to cracks.
As the melting point of lead-free solder (Sn-Ag-Cu) is higher than the lead wire solder by 40ºC, we recommend
you to use a dedicated soldering bit, if you are not familiar with how to obtain lead-free wire solder or soldening
bit, contact our service station or service ranch in your area.
3 Soldering
As the melting point of lead-free solder (Sn-Ag-Cu) is about 220°C which is higher than the conventional lead
solder by 40°C, and as it has poor solder wettabillty, you may be apt to keep the soldering bit in contact with the
PWB for extended period of time. However, Since the land may be peeled off or the maximum heat-resistance
temperature of parts may be excoeded, remove the bit from the PWB as soon as you conurm the steady soldering
condition.
Lead-free solder contains more tin, and the end of the soldering bit may be easily corroded.Make sure to tum on
and off the power of the bit as required.
if a different type of solder stays on the tip of the soldering bit, it is alloyed with lead-free solder.Clean the bit after
every use of it.
When the tip of the soldering bit is blackened during use, file it with steel wool or fine sandpaper.
Be careful when replacing parts with polarity indication on the PWB silk.
Indicates lead-free solder of tin, silver and copper.
Lead-free wire solder for servicing
Part No, ★Description Code
ZHNDAi123250E J φ0.3mm 250g(1roll) BL
ZHNDAi126500E J φ0.6mm 500g(1roll) BK
ZHNDAi12801KE J φ1.0mm 1kg(1roll) BM
LFa

5
LC-10A3U
SUPPLEMENT
SPECIFICATIONS
ITEMS LC-10A3U
MODEL
LCD panel 10.4”TFT LCD
Number of pixels 921,600 pixels VGA
Video color systems N358, N443, PAL, PAL-M, PAL-N, SECAM, PAL-60
Destination USA/Latin A/Twn
TV Standard (CCIR) NTSC/PAL-M/PAL-N
TV TV Tuning System PLL 181 ch.
FUNCTION STEREO AV STEREO
EZ SETUP Yes
CATV 125 ch.
4-LINE COMB FILTER Yes
Brightness 400 cd/m
2
Lamp life 60,000 Hours
Viewing angles H: 120°V: 100°
Audio amplifier 1.0 W ×2
Speakers 1-3/16 ×1-37/64 in. (3 ×4 cm),2 pcs
Terminals AV1 AV-IN 1, S-IN
AV2 AV-IN 2
AV OUT AV-OUT
ANT F-Type
H/P Mini-jack for stereo (3.5 ø) (Rear)
OSD LANGUAGE English/French/Spanish
Power supply DC 12 V, AC110-240 V
Weight 3.97 lbs (1.8 kg) w/o accessories
Accessories R/C, Batteries, Wall mount parts, Antenna cable,
AC adapter, AC cord
■Design and specifications are subject to change without notice.

6
LC-10A3U
SUPPLEMENT OPERATION MANUAL
Main unit (front view)
Remote control
Y
MUTE
DISPLAY VOLUME UP (+)/
DOWN (—)
BRIGHT
MENU
CHANNEL UP ( )
DOWN ( )
MAIN POWER
TV/VIDEO
Top control panel
Remote sensor window
Power/standby indicator
■ The (MUTE), DISPLAY, MENU, VOLUME UP(+)/DOWN(–), CHANNEL UP(▲
▲
)/DOWN(▼
▼
▲
▲▼
▼
), and TV/VIDEO
MENU
Main unit (rear view)
DC12V
AV-OUT
AV-IN2
AV-IN1
Audio
Audio
AUDIO
V
V
V
S
RL
Antenna input terminal
ANT POWER
INPUT
HEADPHONE
AV input 1
terminal
S-Video input
Video input
Audio R/L
DC input terminal
AV output
terminal
AV input 2
terminal
Headphone output
terminal
Adjust the set stand to an angle so that
the screen is easily visible. The set stand
can be opened up to 80 .
Rear terminal section
CH
8
9
000
1
1
23
456
7
MENU
POWER
TV/VIDEO
CHANNEL SELECT
CH ( )/( )
FLASHBACK
DISPLAY
MUTE
↓
↓
↓
Selects next higher channel
Selects next lower channel
Returns to previous channel
Press....Displays receiving channel for 10 seconds.
Channel indication reduces in size after
about 10 seconds.
Press again....After the CH call is displayed in large
size, COLOR SYSTEM except N358
and is displayed for 10 seconds, and
then CH will be displayed in small
size only.
Small CH display
No display
The above three displays can
be switched.
Press....Stops sound.
LCDTV
POWER
TV/VIDEO
CH
VOL
+
VOL
-
DISPLAY
MENU
MUTE
FLASHBACK
provide the same functions as the buttons on the remote control.
button has a slightly different function from the remote control button.)
buttons
(The
BRIGHT MUTE DISPLA MENU VOL CH TV/VIDEO
OFF ON
MAIN POWER
+
-
(The actual location is not visible)
A green indicator lights when the power is on and a red indicator
lights when in the standby mode (the indicator will not light when
the power is off).

7
LC-10A3U
SUPPLEMENT
DIMENSIONS
Unit:inch (mm)

8
LC-10A3U
SUPPLEMENT REMOVING OF MAJOR PARTS
1. Remove the five lock screws 1off the cabinet B.
2. Push on the six hooks 2of the cabinet B and open it slightly.
3. Disconnect all the connectors 3from the tuner and switch PWBs. Detach the cabinet B.
4. Disconnect all the connectors 4from the main PWB.
1
1
2
2
2
2
2
2
1
1
1
3
3
3
3
P2001
P3203
P3204
SC401
P701
Cabinet
Cabinet A
B
4
4
4
4
(Main PWB)
P701 P751
P2001
P2002
P752 P401 SC1201
SC1203
P301
(Main PWB)

9
LC-10A3U
SUPPLEMENT
5
7
7
6
5
Main PWB
LC display unit
Cabinet A R/C, LED PWB
8
8
9
9
8
10
5. Remove the four lock screws 5off the main PWB.
6. Peel off the tapes 6and detach the LCD panel unit.
7. Remove the two lock screws 7off the R/C, LED PWB.
8. Remove the two lock screws 8off the terminal PWB.
9. Remove the two lock screws 9off the switch PWB.
10.Remove the two lock screws 0off the flexible shield.
Cabinet B
Switch PWB
Tuner PWB
Flexible shield
10" LCD Panel unit ass’y
(Rear view)

10
LC-10A3U
SUPPLEMENT
11
11
11
11
11
12
11
11
11.Undo the seven hooks qto release the unit frame.
12.Detach the fluorescent lampw.
Lamp unit
10" LCD panel unit
Panel Holder

11
LC-10A3U
SUPPLEMENT
ADJUSTING PROCEDURE OF EACH SECTION
The best adjustment is made before shipping. If any position deviation is found or after part replace is performed, adjust
as follows.
1.Preparation for Adjustments
(1)Use the exclusive-use AC adapter or stable DC power supply.
AC adapter: UADP-0227CEPZ
DC power supply: 12 ± 0.5V
2.Special mode setting procedure
(1)After initialization of E2PROM the mode is changed to the adjustment mode.
[Procedure]
Connect TP2001 and TP2002 to GND, and turn on the power.
[Description]
»The initialization of microcomputer is as follows.
»AV position, DAC data, G/A data, sound processor data, and video chroma data adjustment values are taken as
defaults.
(2)Adjustment mode
[Procedure]
Short-circuit TP2001 to GND, and turn on the power.
Or short-circuit TP2002 to GND, and turn on the power.
Or holding down the [TV/VIDEO] key and [MENU] key, turn on the main power, and simultaneously press the
(inspection process) [CH "] key and [VOL–] key to change the mode to the adjustment mode.
[Description]
The manual adjustment or adjustment through communication with the automatic machine is performed.
(3)Inspection mode
[Procedure]
Holding down the [TV/VIDEO] key and [MENU] key, turn on the power.
[Description]
»In the ordinary menu select “VIDEO ADJUST”with the [CH] key, and decide with the [VOL] key. Then select
“PICTURE”, “TINT (only NTSC)”, “COLOR”, “BLACK LEVEL”, “SHARPNESS”, “RED-BLUE”, “GREEN”and
“COLOR SYSTEM”with the [CH] key, and decide with the [VOL] key. After that, adjust values with the [VOL] key.
»VOLUME, PICTURE, TINT (only NTSC), COLOR, BLACK LEVEL, SHARPNESS, RED-BLUE, GREEN change
as follows.
(4)Shipping setting mode
[Procedure]
Holding down the [TV/VIDEO] key and [MENU] key, turn on the main power, and simultaneously press the
(inspection process) [CH '] key and [VOL+] key to change the mode to the shipping setting mode.
[Description]
User adjustment and other values are taken as defaults.
If TV is indicated as SETTING COMPLETE, setting has been completed.
3.Cancel of special mode
Turn off the main unit power.
Min. Center Max.

12
LC-10A3U
SUPPLEMENT
4.Reset of lamp error
If the power LED remains red an the power is not turned on, or if repair has been performed, enter the adjustment
mode to reset the lamp error.
For the resetting procedure, refer to "No power" in the "trouble shooting Table" section.
5.Adjustments
1 B+ Adjustment
(If E2PROM is replaced)
(IC2004)
2 Inch Size setup
(If E2PROM is replaced)
(IC2004)
3 Common-bias
adjustment
4 TAMP adjustment
1. Connect the DC voltmeter to pin (49)
of SC401.
1. Go to the adjustment mode.
1. Receive a B/W channel.
2. Go to the adjustment mode.
3. Select the"COMBIAS"with [MENU]
key.
1. In the TV mode, the unit receives a
picture of the half color bar signal
whose left top corner is 75% white.
The signal does not have to be the
half color bar as long as the 180th
line from the top and 46th pixel from
the left is 75% white. (Data at this
point is used for adjustment.)
1. Adjust the "B+ Adj" value to
5.0 ± 0.02V with [VOL+] or [VOL-]
key.
* The color of "+B Adj" must be yellow.
1. Select "MODEL" and adjust to "A2U"
with [VOL +] or [VOL –] key.
* The color of "MODEL" must be yellow.
1. Adjust "COM BIAS" to the darkest
screen with [VOL +] and [VOL –] key.
* The color of "COM BIAS" must be
yellow.
Adjustment Adjusting conditions Adjusting method
Vertical: 180th line
Horizontal: 46th pixel
Upper left 75%
640 pixels
480 lines
2. Adjust "NTSC TAMP" on the page 2
of the adjustment process mode so
that the "Y" value on the same page
falls between B0 - BA.
Page 2 of the adjustment process
mode
3. Set the values of PAL-M TAMP and
PAL-N TAMP same.
2
| COM BIAS 140
NTSC TAMP 27
SECAM TAMP 27
PAL-M TAMP 27
PAL-N TAMP 27
TV H-PEAKING 3
RCUTOFF +3
GCUTOFF 0
BCUTOFF -9
G3 B3 R3 00 00 00
G1 B4 Y DF DE B5
Y-Data
(White 75%)

13
LC-10A3U
SUPPLEMENT
5 White balance adjustment
6 Checking and modifying
the settings
(If E2PROM is replaced)
1. Receive the monoscope pattern
signal.
2. Adjust the "RCUTOFF" and
"BCUTOFF" settings on the page 2
of the adjustment process mode to
become the proper white balance.
Do not change the "GCUTOFF"
settings. (It also change the black
level.)
1. Go to the adjustment mode and
check the following settings.
»V0 240
»V16 201
»V16 BIAS 127
»V32 99
»V32 BIAS 127
»V48 47
»V48 BIAS 127
»V63 0
»VGL ADJ 90
»COM 195
1.See if all the settings are as specified.
If not, select an item in question with
[VOL +] or [VOL –] key and adjust the
setting as shown at left.
* An item selected will be highlighted in
yellow.
Adjustment Adjusting conditions Adjusting method
6.Shipping setting list
Channel............................................................................................................................................... 2ch
Air/Cable ............................................................................................................................................. Air
Skip Data_CATV................................................................................................................................. All Skip
Skip Data_AIR .................................................................................................................................... All Skip
Volume................................................................................................................................................ 20
Picture................................................................................................................................................. 30
Tint ...................................................................................................................................................... 0
Color ................................................................................................................................................... 0
Black Level ......................................................................................................................................... 0
SHARP................................................................................................................................................ 0
RED-BLUE.......................................................................................................................................... 0
GREEN ............................................................................................................................................... 0
TV Color System................................................................................................................................. N358
AV Color System ................................................................................................................................ Auto
Language ............................................................................................................................................ English
Blue Screen ........................................................................................................................................ Off
EZ Setup Auto Start............................................................................................................................ On
Sleep Timer ........................................................................................................................................ None
Brightness........................................................................................................................................... Bright
Auto Power Off ................................................................................................................................... Off
Upside................................................................................................................................................. Normal
Rigth/Left ............................................................................................................................................ Normal

14
LC-10A3U
SUPPLEMENT
No
No Power (Power LED indicator still in red)
Go to the adjustment process mode.
Move the cursor to ERROR NO RESET
and click on it (to reset to zero).
Turn off the power.
Is the power turned on again?
1+B-ADJ 160
MODEL A2U
INCH SIZE 10
TIMER 1
SYSTEM AUTO
NTSC PWM FREQ OCO
PAL PWM FREQ OBD
CLOSED CAPTION OFF
V-CHIP OFF
TV GAIN OFF
ERROR NO RESET 5
Check the back light lamp, D753, Q754, D757 and
their peripheral parts as well as pin (42) of IC2001.
Note:
This model is equipped with the lamp error detection function
that detects the current flowing into the fluorescent lamp and
protects the backlight lamp drive circuit.
If a lamp error is detected, the microprocessor interrupts the
unit and the ERROR NO RESET setting will go up.
When the ERROR NO RESET setting has reached "5", the
microprocessor turns and keeps off the unit's power. To
resume the power, take the above procedure to clear the
ERROR NO RESET setting.
TROUBLE SHOOTINGTABLE

15
LC-10A3U
SUPPLEMENT
TROUBLE SHOOTINGTABLE (Continued)
No picture
at all
Yes
No
Are inputs
and outputs
of IC802 as
specified?
Check all the settings on the microprocessor’s adjust process menu.
No picture
Check IC802
and its
peripheral
parts.
Yes
No
Are inputs
and outputs
of IC1201 as
specified?
Check
IC1201 and
its peripheral
parts.
No
Check IC1203,
IC1204 and
their peripheral
parts.
Are inputs
and output of
IC1203 and
IC1204 as
specified?
Yes
Check LCD
panel voltage
and
waveform.
NoTV and
VIDEO 1
output
Yes
No
Are inputs
and outputs
of IC402 as
specified?
Check IC402
and its
peripheral
parts.
NO
Is input at Pin
(73) of IC802
as specified?
Check IC802,
AV1 line and
their
peripheral
parts.
NoTV
output
Yes
No
Are voltages
at Pins (6),
(7) and (9) of
tuner as
specified?
Check the
power line.
Yes
No
Is output at
Pin (19) of
tuner as
specified?
Check the
tuner and its
peripheral
parts.
No
Is input at Pin
(1) of IC402
as specified?
Check the
line in
question.
Yes
Check IC402
and its
peripheral
parts.
Yes
No
Are Pins (2)
and (4) of
IC402 at “H”
and “L”
respectively?
Are Pins (65)
and (66) of
IC2001 at “H”
and “L”
respectively?
NoVIDEO
1 output
YES
No
Is input at Pin
(1) of IC402
as specified?
Check the
line in
question.
Yes
No
Are Pins (1)
and (4) of
IC402 both at
“L”?
NoVIDEO
2 output
No
Is input at Pin
(74) of IC802
as specified?
Check J3404,
AV line and
their
peripheral
parts.
No S
VIDEO
output
No
Are inputs at
Pins (71) and
(72) of IC802
as specified?
Check
SC3301, SY
line, SC line
and
peripheral
parts.
Are Pins (65)
and (66) of
IC2001 both
at “L”?
Check IC402
and its
peripheral
parts.
Yes
Check the
line in
question.
Yes
Check the
line in
question.

16
LC-10A3U
SUPPLEMENT TROUBLE SHOOTINGTABLE (Continued)
No picture and sound
No color
NoTV color No S-VIDEO color
Yes
No
Do F3701 and F3702
function?
Check all the settings on the microprocessor’s adjust process menu.
No
Are secondary outputs
(+38V, +16V, +9V, +5V, -8V)
of T701 as specified?
Yes
Are the oscillation waveform
at T701’s primary side as
specified?
Yes
No
Disconnect F3701 and
F3702. Is the load side
short-circuited?
Yes
No
Is any of T701’s primary side,
Q701, Q710 and S4701
short-circuited?
Check J3701, its peripheral
parts and connection cable.
Replace F3701 and F3702.
Check S4701 and
connection cable.
Check the secondary-side
load of T701.
Fluorescent lamp failure
Yes
No
Does F3751 function?
Yes
No
Is Pin (34) of IC1201 at “H”?
Yes
No
Are the oscillation waveforms
at the primary side of T751
and T752 as specified?
Yes
Replace F3751.
No
Is input at Pin (71) of IC802
as specified? Check J3301, SC line and
peripheral parts.
Yes
Check the line, IC1201 and
its peripheral parts.
Check Q751, Q752,T751,
T752, Q753 and their
peripheral parts.
Replace the fluorescent lamp
and check the oscillation
waveform again.
NoVIDEO color
Check all the settings on the microprocessor’s adjust process menu.

17
LC-10A3U
SUPPLEMENT
TROUBLE SHOOTINGTABLE (Continued)
No sound
from
speakers
Yes
No
Is Pin (53) of
IC2001 at “L”?
Check all the settings on the microprocessor’s adjust process menu.
No sound
No
Are outputs at
Pins (1) and (7)
of IC903 as
specified?
Yes
No
Are inputs and
outputs of
IC303 as
specified?
Yes
No
Are inputs at
Pins (5) and (8)
as well as
outputs at Pins
(2) and (11), all
of IC301, as
specified?
Muting effect is
on. Check the
FSMU line.
Check IC901,
IC903 and their
peripheral
parts.
Check IC303
and its
peripheral
parts.
Check the line
in question,
IC303 and its
peripheral
parts.
Yes
Check the
speakers and
their peripheral
parts.
No sound
from
headphone
Yes
No
Is Pin (55) of
IC2001 at “L”?
Check the
headphone and
its peripheral
parts.
Check Q306,
J3404 and their
peripheral
parts.
No sound
from output
line
Yes
No
Is Pin (52) of
IC2001 at “L”?
No
Are outputs at
Pins (1) and (7)
of IC902 as
specified?
Yes
Check the line
in question.
Check the
LMUTE line.
Check IC902
and its
peripheral
parts.
TV sound
failure
Yes
No
Is output at Pin
(16) of tuner as
specified?
No
Is input at Pin
(60) of IC901
as specified?
Check the
tuner and its
peripheral
parts.
Check IC901,
Q3301, Q3204,
Q3205 and
their peripheral
parts.

18
87109654321
A
B
C
D
E
F
G
H
LC-10A3U
SUPPLEMENT
CHASSIS LAYOUT
INVERTER
FIFOIC
MAIN Unit (Side-A)
MAIN Unit (Side-A)

19
1716 1918151413121110
LC-10A3U
SUPPLEMENT
J3701 D3301
F3751 F3701 F3702
Q3405
Q3403Q3402 Q3401
J3404 J3302
J3403
J3305
J3401 J3402
D3402
Q3304
Q3301
Q3303
D3401
J3304 J3301
J3303
TU3201
TUNNER
Q3404
C3202
L3202
P3701
P3203 P3204
Q3204
Q3205
Q3203
SC3401
Q3201
Q3202
P4004
S4013 S4012 S4017 S4009 S4014 S4015 S4011 S4010 S4016
S4701
SC4102
RMC
4101
TUNER Unit
SWITCH Unit (Side-A)
SWITCH Unit (Side-B)
R/C, LED Unit

20
87109654321
A
B
C
D
E
F
G
H
LC-10A3U
SUPPLEMENT
BLOCK DIAGRAM