SHARP LC-10A3U Service Manual

SERVICE MANUAL

SUPPLEMENT

LCD COLOR TELEVISION

LC-10A3U

SUPPLEMENT

SX2T7LC-10A3U

MODEL

LC-10A3U

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.

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.

LCD COLOR TV
MODEL
MODÉLE
ELECTRICAL RATING
DC 12V 24W
CONSOMMATION
CC 12V 24W

SERIAL NO. 210451112
N DE SERIE
MANUFACTURED OCTOBER 2002
DATE DE PRODUCTION OCTOBER 2002

SHARP CORPORATION

FABRIQUÉ AU JAPON

LC-10A3U-S A

MADE IN JAPAN

A Mark

CONTENTS

Page

» 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

SHARP CORPORATION

This document has been published to be used for
after sales service only.
The contents are subject to change without notice.

LC-10A3U

2

2

SUPPLEMENT

IMPORTANT SERVICE SAFETY PRECAUTION

Ë

Service work should be perfomed only by qualified service technicians who are thor­oughly familiar with all safety checks and the servicing guidelines which follow:

WARNING

1. For continued safety, no modification of any circuit
should be attempted.

2. Disconnect AC power before servicing.

CAUTION: FOR CONTINUED
PROTECTION A GAINST A RISK OF
FIRE REPLACE ONLY WITH SAME
TYPE F3701 (1.6A, 125V),

A V

F3702(1.6A, 125V) AND F3751
(2.5A, 125V) FUSE.

BEFORE RETURNING THE 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 A C 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 ha ving 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 necessar y, 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 A C .) or more is e xcessive and indicates
a potential shock hazard which must be corrected
before returning the monitor to the owner .

DVM

AC SCALE

50k ohm

10W

0.15 µF

TEST PROBE

TO EXPOSED
METAL PARTS

CONNECT TO
KNOWN EARTH
GROUND

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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 , w attage , etc.
Replacement parts which have these special safety
characteristics are identified in this manual; electrical

and shaded areas in the

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.

components having such features are identified by “ å”

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2

Replacement Parts Lists

.

and

LC-10A3U

2

2

2

VTVM

ECHELLE CA

50k ohm

10W

0.15 µF

SONDE D'ESSAI

AUX PIECES
METALLIQUES
EXPOSEES

BRANCHER A UNE
TERRE CONNUE

SUPPLEMENT

PRECAUTIONS A PRENDRE LORS DE LA REPARATION

Ë

Ne peut effectuer la réparation qu' un technicien spécialisé qui s'est parfaitement
accoutumé à toute vérification de sécurité et aux conseils suivants.

AVERTISSEMENT

• Utiliser un voltmètre CA d'une sensibilité d'au moins
5000Ω/V pour mesurer la chute de tension en travers

1. N'entreprendre aucune modification de tout circuit.
C'est dangereux.

2. Débrancher le récepteur av ant toute réparation.

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

A V

PRECAUTION: POUR LA

PRO TECTION 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).

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 a voir
inversé la fiche du cordon d'alimentation. (Si nécessaire,
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.

VERIFICATIONS CONTRE L'INCEN-DIE ET
LE CHOC ELECTRIQUE

Dans le cas contraire, il y a une possibilité de choc
électrique qui doit être supprimée avant de rendre le
récepteur au client.

Avant de rendre le récepteur à l'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 placé entre 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,
le dos du coffret, les couvercles ou blindages de réglage
et de compartiment, les réseaux de résistance­capacité, 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 suiv ante:

• Brancher le cordon d'alimentation directem-ent à une
prise de courant de 110-240V. (Ne pas utiliser de
transformateur d'isolation pour cet essai).

• A l'aide de deux fils à pinces, brancher une résistance
de 50 kΩ 10 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.

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AVIS POUR LA SECURITE

De nombreuses pièces, électriques et mécaniques, dans
les téléviseurs présentent des caractéristiques spéciales
relatives à la sécurité, qui ne sont souvent pas évidentes
à vue. Le degré de 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

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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 à celles 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.

3

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:

L Fa

Indicates lead-free solder of tin, silver and copper.

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 y ou 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.

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

4

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.

LC-10A3U

SUPPLEMENT

5

LC-10A3U

SUPPLEMENT

OPERATION MANUAL

Main unit (front view)

Remote sensor window

Power/standby indicator

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).

(The actual location is not visible)

Top control panel

BRIGHT

BRIGHT

MUTE

■

The (MUTE), DISPLAY, MENU, VOLUME UP(+)/DOWN(–), CHANNEL UP(▲▲)/DOWN(▼

provide the same functions as the buttons on the remote control.

buttons

button has a slightly different function from the remote control button.)

(The

MENU

DISPLA

MUTE

Y

DISPLAY

MENU

-

VOL CH

MENU

VOLUME UP (+)/
DOWN (—)

+

TV/VIDEO

CHANNEL UP ( )
DOWN ( )

TV/VIDEO

OFF ON

MAIN POWER

▼

MAIN POWER

), and TV/VIDEO

Main unit (rear view)

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

AV input 1
terminal

AV-IN1

AV-IN2

AV-OUT

S-Video input
Video input
Audio R/L

AV input 2
terminal
AV output
terminal

Headphone output
terminal

DC input terminal

S

V

L

R

AUDIO

Audio

V

Audio

V

HEADPHONE

POWER

INPUT

ANT

DC12V

Antenna input terminal

Remote control

POWER

TV/VIDEO

CHANNEL SELECT

POWER

TV/VIDEO

VOL

-

1123
456

8

7

000

LCDTV

CH

CH

FLASHBACK

9

MENU

DISPLAY

MUTE

MENU

▲

CH ( )/( )

VOL

+

▼

▲

Selects next higher channel
Selects next lower channel

▼

FLASHBACK

Returns to previous channel

DISPLAY

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

The above three displays can
be switched.

MUTE

Press....Stops sound.

↓
↓

No display

↓

6

DIMENSIONS

LC-10A3U

SUPPLEMENT

Unit:inch (mm)

7

LC-10A3U

SUPPLEMENT

REMOVING OF MAJOR PARTS

1. Remove the five lock screws 1 off the cabinet B.

2. Push on the six hooks 2 of the cabinet B and open it slightly.

3. Disconnect all the connectors 3 from the tuner and switch PWBs. Detach the cabinet B.

4. Disconnect all the connectors 4 from the main PWB.

1

1

1

2

2

1

1

2

2

Cabinet

B

2

2

3

P3203

P3204

3

P701

P2001

SC401

3

3

P301

P2001

(Main PWB)

(Main PWB)

4

P752

P401 SC1201

P701

P2002

4

P751

SC1203

4

Cabinet A

4

8

5. Remove the four lock screws 5 off the main PWB.

6. Peel off the tapes 6 and detach the LCD panel unit.

7. Remove the two lock screws 7 off the R/C, LED PWB.

8. Remove the two lock screws 8 off the terminal PWB.

9. Remove the two lock screws 9 off the switch PWB.

10.Remove the two lock screws 0 off the flexible shield.

LC-10A3U

SUPPLEMENT

Main PWB

LC display unit

6

Cabinet A

5

5

7

8

Tuner PWB

7

Switch PWB

R/C, LED PWB

9

9

8

8

10" LCD Panel unit ass’y

(Rear view)

10

Cabinet B

Flexible shield

9

LC-10A3U

SUPPLEMENT

11.Undo the seven hooks q to release the unit frame.

12.Detach the fluorescent lampw.

11

12

11

11

11

10" LCD panel unit

Panel Holder

11

11

Lamp unit

11

10

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.

Min. Center Max.

(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.

11

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

Adjustment Adjusting conditions Adjusting method

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 "COM BIAS" 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.)

Upper left 75%

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.

Vertical: 180th line
Horizontal: 46th pixel

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

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%)

3. Set the values of PAL-M TAMP and

PAL-N TAMP same.

12

Adjustment Adjusting conditions Adjusting method

5 White balance adjustment

LC-10A3U

SUPPLEMENT

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.)

6 Checking and modifying

the settings
(If E2PROM is replaced)

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.

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

13

LC-10A3U

SUPPLEMENT

TROUBLE SHOOTING TABLE

No Power (Power LED indicator still in red)

Go to the adjustment process mode.

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

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?

No

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.

14

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.

No TV 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.

No TV

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?

No VIDEO

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”?

No VIDEO

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.

TROUBLE SHOOTING TABLE (Continued)

LC-10A3U

SUPPLEMENT

15