Sharp LC-15B2E, LV-15B2EA Schematic

LC-15B2EA

SERVICE MANUAL

S42H2LC15B2EA

LCD COLOUR TELEVISION

MODEL

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.

LC-15B2EA

CONTENTS

Page Page

» IMPORTANT SERVICE SAFETY

PRECAUTION.................................................... 2

» SPECIFICATIONS ............................................. 3

» OPERATION MANUAL ...................................... 4

» DIMENSIONS .................................................... 5

» REMOVING OF MAJOR PARTS ....................... 6

» ADJUSTING PROCEDURE OF

EACH SECTION ................................................ 9

» TROUBLE SHOOTING TABLE ........................ 12

» CHASSIS LAYOUT .......................................... 18

» BLOCK DIAGRAM........................................... 20

» OVERALL WIRING DIAGRAM ........................ 22

» DESCRIPTION OF SCHEMATIC DIAGRAM .. 24
» SCHEMATIC DIAGRAM

Ë

RC/LED and OPERATION UNIT ............... 25

Ë

MAIN UNIT ................................................ 26

Ë

TUNER UNIT ............................................. 38

Ë

INVERTER UNIT ....................................... 46

» PRINTED WIRING BOARD ASSEMBLIES..... 47

» PARTS LIST

Ë

ELECTRICAL PARTS ................................ 51

Ë

MAIN UNIT ................................................ 51

Ë

TUNER UNIT ............................................. 55

Ë

INVERTER UNIT ....................................... 59

Ë

RC/LED UNIT ............................................ 60

Ë

OPERATION UNIT..................................... 60

Ë

CABINET AND MECHANICAL PARTS ..... 60

Ë

ACCESSORIES PARTS ............................ 62

Ë

PACKING PARTS....................................... 62

» PACKING OF THE SET ................................... 63

SHARP CORPORATION

LC-15B2EA

2

2

IMPORTANT SERVICE SAFETY PRECAUTION

Ë

Service work should be perfomed only b y qualified service technicians who are thoroughl y
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
AGAINST A RISK OF FIRE REPLACE ONLY WITH
SAME TYPE F1(T1.25AL, 250V), F2(T1.25AL, 250V),
F6500 (T1.25AL, 250V) AND F6501 (T1.25AL, 250V)
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

234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121

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”

234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121

2

Replacement Parts Lists

.

and

Specifications

Items 15" LCD COLOUR TV, Model: LC-15B2EA
LCD panel 15" Advanced Super View & BLACK TFT LCD
Number of dots 921,600 dots
Video colour system PAL/SECAM/NTSC
TV TV-Standard (CCIR) B/G, I, D/K, L
Function TV-Tuning System Auto preset 200 ch.

STEREO/BILINGUAL NICAM, IGR
AUTO PRESET Yes

CATV ~Hyper Band
Brightness 430 cd/m
Lamp life 60,000 hours
Viewing angles H: 170° V: 170°
Audio amplifier 2.1 W × 2
Speakers 4 × 7 cm Oval, 2 pcs.
Terminals AV-IN 1 RGB

AV-IN 2 S-VIDEO, VIDEO, AUDIO

OUT AUDIO

Antenna DIN

Headphones 3.5 mm ø jack (Rear)
OSD language English/German/French/Spanish/Italian/Swedish/Dutch
Power requirement DC 12 V, AC 110 V – 240 V, 50/60 Hz
Weight 5.2 kg, incl. stand, excl. accessories
Accessories Operation Manual, Remote Control, Batteries,

LC-15B2EA

2

AC adapter, AC cord, Cable clamp

Specifications are subject to change without prior notice.

3

LC-15B2EA

Operation Manual

Main unit (front view) Terminals

Upper control panel

Volume (+)/(–)
CH (

)/( )
MENU
TV/VIDEO

(MAIN POWER)

MENU

CH

Speaker

Remote sensor window

(The actual location is not visible.)

Note:

Ë TV/VIDEO, CH( )/( ), and Volume (+)/(–) on the main unit have the same functions as the same

buttons on the remote control. Fundamentally, this operation manual provides a description based on
operation using the remote control.

Remote control

Temporarily holds

the current Teletext page.

OK, Programme Table

Displays the Teletext

Subtitle directly.

Red, Picture Menu

Green, Sound Menu

previous channel.

TV/VIDEO

Speaker

Remote sensor indicator

A red indicator blinks when the TV set
receives the remote control signal.

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 main power is off).

HOLD

(Power)

E

L

IT

T

UB

SUBTITLE

SOUND

Switches the

sound mode.

Volume (+)/(–)

Flashback

Returns to the

S

To change the vertical
angle of the LCD TV set,
tilt the screen up to 5
degrees forward or 10
degrees backward. The
TV set can also be
rotated 50 degrees
horizontally. Please adjust
the angle so that the TV
set can be watched most
comfortably.

TEXT

R

E

V

LD

O

H

E

A

L

T

OK

CH

TV/VIDEO

E

N

D

E

MENUSOUND

M

TEXT
REVEAL

The last Teletext page is
displayed with the Reveal
function activated.
The Reveal function applies
to this page only once.

END
Upwards/ Downwards

Selection, zoom display
function

(Teletext mode)

MENU
Right / Left Selection
Cyan, Status Display

Turns on the status display
when the menu is not
displayed.

Yellow,
Timer function Menu

Mute
CH ( )/( )

Display previous/
next page
(Teletext mode)

Channel Select

TV/VIDEO

Antenna

T

U

O

IO

D

U

A

L

R

AUDIO OUT (L)
AUDIO OUT (R)

Headphones

Rear view

Carrying handle

1
N
I

-

V
A

B
G
R

2
N

I

­V

A

O

E
D
I
V

S-

O
E

D
I
V

L

O
I
D

U
A

T
U
O

O
I
D

U
A

L

R

(21-pin Euro-SCART)

AV-IN 2

R

R

E
W
O

P

T

U
P
N

I

V

2
1
C

D

AV-IN 1

S-VIDEO

VIDEO

AUDIO (L)
AUDIO (R)

POWER

INPUT

DC12V

A

V

-IN

1

R

G

B

A

V

-I

N

2

S

-V

ID

E

O

V

ID

EO

L

A

U

D

IO

R

P

O

W

ER
I

N

P

U

T

D

C

1

2

V

4

Dimensions

381.7

303

61.1

56.5

149.5

305.3

LC-15B2EA

MENU

TV/VIDEO

CH

484

229

149.5

61.1

198

98.8

78.7

1

366.2

27

1

AUDIO OUT

L

R

48.5

301.6

100

100

11.8

RGB

S-VIDEO

VIDEO

AUDIO

AV-IN 1

AV-IN 2

L

R

POWER

INPUT
DC12V

(Unit: mm)

5

LC-15B2EA

REMOVING OF MAJOR PARTS

1. Remove the back cover.

2. Remove the table stand fixing screws (4 pcs.).

3. Remove the Rear cabinet fixing screws (9 pcs.) and detach the cabinet.

4. Peel off the tape.

5. Detach the connector from each PWB.

4-6

Front cabinet

4-7

4-8

3

4-5

T

U

O

O

I

D

U

A

L

R

3

4-3

4-4

4-2

3

1

N

I

-

V

A

B

G

R

2

N

I

-

V

A

O

E

ID

-V

S

O

E

D

I

V

L

O

I

D

U

A

R

R

E

W

O

P

T

U

P

N

I

V

2

1

C

D

3

4-1

3

Terminal
cover (L)

1

4

Tape

Rear cabinet

5

SC1202

5

SC1203

5

SC901

5

SC1201

5

Terminal
cover (S)

P4004

MAIN PWB

P3702

SC2002

5

SC1602 P1903

SC1602 P1903

Table stand

OPERATION PWB

INVERTER PWB

P2003

5

5

SC3100

TUNER PWB

P6502

1

2

5

5

P6501

P6500

5

LED PWB

P3601P3601

P3302 P3301

6

5 5

P3603

6. Remove the MAIN PWB fixing screws (3 pcs.).

INVERTERPWB

TUNERPWB

6

MAINPWB

LCDPanelunit

7

Chassisframecover

OPERATIONPWB

Chassisframe

11

LEDPWB

13

9

8

10

13

14

12

7. Remove the INVERTER PWB fixing screws (2 pcs.).

8. Remove the 21-pin terminal fixing screw (2 pcs.).

9. Detach the chassis frame cover.

10. Remove the TUNER PWB fixing screws (4 pcs.).

11. Remove the LED PWB fixing screws (2pcs.).

12.Remove the OPERATION PWB fixing
screws (2 pcs.).

13. Remove the chassis frame fixing scre ws
(2 pcs.).

14. Remove the LCD panel unit fixing screws
(2 pcs.).

LC-15B2EA

7

LC-15B2EA

» Precautions in handling the LCD panels

1. Work in a clean room (with humidities below 50%).

2. Be sure to wear an anti-static armband.

3. Handle the panels on an electroconductive mat.

4. Be careful not to fall, shake and shock the panels.

15. Remove the LCD display unit fixing screws (4 pcs.).

16. Detach the two diffusion sheets and reflection/deflection sheet.

17. Detach the four reflection mirrors.

18. Remove the fluorescent lamp.

19. Detach the lamp guide plate.

20. Detach the two lamp reflection sheets.

17

Reflection Mirror

Reflection Sheet (Cover)
(PSHEP0306CEZZ)

15

15’ LCD Panel Unit

Backlight Lamp
(KLMP-0122CEZZ)

18

Reflection/deflection Sheet
(PSHEP0281CEZZ)

Light Guide Plate
(PGiDM0070CEZZ)

19

16

Diffusion Sheet
(PSHEP0283CEZZ)

17

Reflection Mirror

Lamp Reflection Sheet-1

20

(PSHEP0284CEZZ)

Lamp Reflection Sheet-2
(PSHEP0285CEZZ)

Sheilding Plate
(PSLDM4689CEFW)

8

LC-15B2EA

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.

Preparation for adjustments

Use the dedicated AC adaptor or stable DC power supply.
LC15B2EA AC adaptor: UADP-0240CEZZ
DC power supply: 12V 4.0A

1.Adjusting procedure

• Checker adjustment
Power ON (Adjustment processing mode) → +B adjustment → Counter bias adjustment → TAMP (Contrast)
adjustment
→ White balance adjustment

2.Entering the adjustment processing mode

There are the following two methods.

• Setting the pin (81)(KEY4) or pin (82)(KEY5) of IC2001 (microprocessor) to GND, turn on the power.

• A “POWER” key is made on with pushing an “TV/VIDEO” and “MENU” k eys at the same time.(K of the inspection
process mode is displayed by the upper left of the image plane .) → Next, “CH (Ù)” and “V OL (–)” keys are pushed

at the same time.(It becomes the image plane of the adjustment process mode.).....When it is canceled, it is made

to turn it off.(Even off in the “MAIN POWER” key, off with R/C are good.)

3.Key operation in the adjustment process mode

• The receiving channel UP/DOWN is performed with the “CH (ù)/(Ù)” keys.
One push ... The UP/DOWN tuning is performed per channel.
Continuous push ... The UP/DOWN search is performed until a next receivable station is found.

• V arious adjustments
The adjustment is performed for each item by the “MENU”, “Menu cursor”, “CH (ù)/(Ù)” or “VOL (+)/(–)” keys
(LCD TV set and remote control).

• Adjustment item is chosen with the Menu cursor upward/downward keys.

• The adjustment item makes a toggle operation with the “MENU” key input. (Next item)
If the “MENU” key is input while the bottom item is selected, it moves to the top item on the next page.

• Press the auto preset button on the remote controller in the adjustment process mode, and the top item of the
next page will show up regardless of which item appears now.
Page 1 → Page 2 → ... → Page 23 → Page 1

• Press the manual memory button on the remote controller in the adjustment process mode, and the top item of
the same page will show up.

• UP/DOWN of each adjustment vale selected is performed with the VOL (+)/(–) keys input.

• For P16 – 17, the unit enters the register select mode with the VOL (+)/(–) keys input while NTSC/PAL is selected,
and the cursor moves to the address 01.

• The cursor moves up or down with the “CH (ù)/(Ù)” ke ys and moves left or right with the VOL (+)/(–) keys, and a
decision is made with the 12 key.
When the decision is made, the cursor moves to the adjustment v alue selected, and UP/DOWN of each adjustment
value selected by the “VOL (+)/(–)” keys input is performed.
0 ↔ 1 ↔ ... ↔ 9 ↔ A ↔ ... ↔ F ↔ 0 ↔ ...
Decide with the 12 key and return to the address select. Move to the next item with the “MENU” key.
During address select, the cursor movement by the “VOL (+)/(–)” keys input is as follows:
Example: 01 ↔ 02 ↔ 03 ↔ 01 ↔ ...
The cursor movement by the “CH (ù)/(Ù)” keys input is as follows:
Example: 02 ↔ 05 ↔ ... ↔ F6 ↔ 02 ↔ ...

9

LC-15B2EA

4.Initialization

When the microprocessor (IC2001) or the EEPROM (IC2004) has been replaced or when the EEPROM has been
initialized, readjust the each adjustments.
4-1. Connect the pins (81) and (82) of IC2001 (microprocessor) to GND, and turn on the power.
4-2. Select the model name to (B2EA).
4-3. Select the inch size (15).
4-4. LED changes green from red after setting finish and about 15 seconds, initialization is completed, and it

becomes adjustment mode.

5.Adjustment

5-1. +B adjustment...Page 1 +B-ADJ

Adjust the voltage of the pin (13) of P2002 to 5.00 ±0.02V.
Note: Since 5.0V is a reference voltage of all power voltage, adjust it precisely.

5-2. Counter-bias adjustment

Vary the "COM BIAS" setting on Page 2 of the adjustment process mode so that the contrast be sharpest
(black looks most sinking).

5-3. TAMP adjustment

1) Receive the upper left of 75% white half colour bar signal.

2) See if the “Y” reading on page 2 of the adjusment process mode is somewhere following. If not, make the
“PAL TAMP” adjustment to get the “Y” reading in the range of BF thru C9.

3) If the adjustment of “PAL TAMP” is executed, write its adjustment value to the “SECAM TAMP” manually.

(Screen of the page 2 of the adjustment processing menu OSD)

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
0
1
2
3
4
5
6
7
8

9

10
11
12
13

2

COM B I AS 210

PAL TAMP 27

SECAM TAMP 27
RCU TOF F
GCU TOF F

BCU TOF F
G3 B3 R3 00 00 00
G1 B4 Y 0 0 00 BE

TAMP H

TAMP L

5-4. White balance adjustment

Adjust “RCUTOFF” and “BCUTOFF” on the page 2 of the adjustment processing so as to obtain the colour
of the same level as the standard set.
Note: For the adjustment processing of “RCUTOFF” and “BCUTOFF”, adjust them in the indication value
range of ... –9, –7, ... –1, +1, ... +7, +9.
When it becomes even-numbered value, side favor noise sometimes occurs in the monochrome signal of
the specific gradation.

Y Data

(White 75%)

–

5
0

– 1

C9
BF

10

LC-15B2EA

6. Factory Setting

6-1. Perform a factory setting after completing all adjustments.
6-2. A “POWER” keys is made on with pushing an “TV/VIDEO” and “MENU” keys at the same time.
6-3. “K” of the inspection process mode is displayed on the screen upper left.
6-4. CH (ù) and VOL (+) keys are pushed about 2 seconds at the same time.
6-5. Release keys, if “E” is displayed on the screen upper left and “COMPLETE” is displayed on the bottom of it.
6-6. After a while, a power will be in a standby mode and a setup will be finished.
Note: “First installation” serves on “Deutsch”.

7. Lamp error detection

7-1. Functional description

This LCD colour television has a function (lamp error detection) to be turned OFF automatically for safety
when the lamp or lamp circuit is abnormal.
If the lamp or lamp circuit is abnormal, or some other errors happen, and the lamp error detection is executed,
the followings occur.
1 The main unit of television is turned OFF 5 seconds after it is turned ON. (The power LED on the front side

of TV turns from green to red.)

2 If the situation 1 happens 5 times sequentially, television can not be turned ON. (The power LED remains

red.)

7-2. Countermeasures
7-2-1.Check when turning OFF the lamp error detection

When television is turned OFF by the lamp error detection mentioned above, it enters the adjustment
process with the power LED red. Entering the adjustment process turns OFF the error detection and turns
ON TV.
This enables the operation check to detect errors in the lamp or lamp circuit.
Check whether "ERROR NO RESET" on line 7, page 1 of the adjustment process is 1 or more. If it is 1 or
more, it indicates the lamp error detection was executed.

7-2-2.Resetting of the lamp error count

After confirming that the lamp or lamp circuit is normal, reset the lamp error count. Select "ERROR NO
RESET" on line 5, page 1 of the adjustment process and set the number to 0 using the volume button.

Page 1 of the adjustment process

1

+B – A D J 160
M O D E L B2EA
INCH S I ZE 15
N T S C P W M F R E Q 0C0
P A L P W M F R E Q 0BD
N T S C P W M D U T Y 0
P A L P W M D U T Y 0
T V G A I N OFF
ERROR NO RESET 5

Reset 0

P U B L I C M O D E OFF

C 2 E A V E R 1 . 2 0 0

Afterwards, perform the operation check to confirm that the lamp error detection does not function.

11

LC-15B2EA

No picture, No sound

Check all the settings microprocessor's adjust process menu.

Do F1 and F2 function?

Are T3701's secondary

outputs +31V, +22V, +9V,

+5V and -8V normal?

Remove F1 and F2 and

check the load side.

Is there short-circuiting?

Is there short-circuiting of

T3701 primary side periphery,

Q3700, Q3701 and S4701?

Replace F1 and F2.

Check S4701 and

connection cable.

Is T3701's primary oscillator

waveform normal?

Check T3701's secondary

load.

Yes Yes

No

No No

No

Yes

Check J3702 periphery and

connection cable.

Yes

Back light lamp failure to light up

Replace F6500 and F6501.

Is the pin (34) of IC1201 in

the "H" state?

Is the primary side of

T6500~T6503 periphery

short-circuiting?

Replace the back light lamp

with new one and check

again.

Yes

Yes

No

No

Yes

Check the OFL1 line, IC1201

and their peripheral parts.

Check T6500~T6503,

Q6500~Q6505 and

connection cable.

TROUBLE SHOOTING TABLE

12

No picture (1)

Check all the settings microprocessor's adjust process menu.

Is in/output of

IC801 normal?

Is in/output of

IC1201 normal?

Check IC801

and its

peripheral parts.

Check IC1201

and its

peripheral parts.

Check IC402

and its

peripheral parts.

Check IC801,

AV1 line and its

peripheral parts.

Check LCD

panel voltages

and waveform.

Yes

Yes

No

No

No picture

at all

Is in/output of

IC402 normal?

Is input at pin

(73) of IC801

normal?

Yes

No

No

No TV and

S-Video

output

Is voltages at

pins (6), (7) and

(18) tuner

normal?

Is output at pin

(13) of tuner

normal?

Check the

power line.

Check tuner

and its

peripheral parts.

Is input at pin

(3) of IC402

normal?

Is the pins (2)

and (4) of IC402

at "H" and "L"

state?

Yes

Yes

No

No

No

No

No

Yes

No TV output

Is the pins (65)

and (66) of

IC2001 at "H"

and "L" state?

Yes

Check the its

line.

Check the its

line.

Check IC402

and its

peripheral parts.

Is input at pin

(75) of IC801

normal?

Check V1 IN

line and its

peripheral parts.

No

No VIDEO 2

output

TROUBLE SHOOTING TABLE (Continued)

LC-15B2EA

13

LC-15B2EA

No picture (2)

Check all the settings microprocessor’s adjust process menu.

Is input at pin

(74) of IC801

normal?

Check the AV2

line and its

peripheral parts.

Check the W9,

SY-line, SC-line

and their

peripheral parts.

No

No VIDEO 1

output

Is input at pin (1)

of IC402 and pin

(71) of IC801

normal?

No

No S-VIDEO

output

Check IC1203

and its

peripheral parts.

No

No

Yes

Yes

Yes

No TELETEXT

output

Yes

Is input at pins (2),

(5), (11), and (14)

of IC1203 normal?

Is input at pins (3),

(4) and (5) of

SC1602 normal?

Is output at pins (1)

and (7) of IC1619 and

pin (1) of IC1620

normal?

No

Check connection

cable

Check the R, G

and B line.

No

Check IC1619,

IC1620 and their

peripheral parts.

Is output at pins

(57)~(59) of IC1601

normal?

No

Yes

Check V2V0 line

and its peripheral

parts.

Is input at pin (21) of

IC1601 normal?

Check IC1601 and its

peripheral parts.

TROUBLE SHOOTING TABLE (Continued)

14

TROUBLE SHOOTING TABLE (Continued)

No picture (3)

Check all the settings microprocessor's adjust process menu.

Is output of

R0~R7

normal?

Is output of

G0~G7

normal?

Is output of

B0~B7

normal?

Yes

Yes

No

No

No

Colour is

unusual

Is in/output of

SPIO and

SPOI normal?

No

No picture

image

inversion

No

Gradation

defect

Is output of U/D

normal?

Yes

No

Check R1202 and

its peripheral parts.

Check R1209 and

its peripheral parts.

Check IC1206,

IC1207, Q1201 and

their peripheral

Check R1203 and

its peripheral parts.

Check R1204 and

its peripheral parts.

Is output V0, V7, V17,

V21, V32, V64, V112,

V176, V235 and

V255 normal?

Check IC1106,

IC1107, IC1108,

IC1114, IC1115 and

their peripheral parts.

LC-15B2EA

15

LC-15B2EA

No sound (1)

Check all the settins microprocessor

’s adjust process menu.

Is the pin (53) of

IC2001 in the

"L" state?

Is output at pins

(27) and (28) of

IC1901 normal?

Is output at pins

(1) and (7) of

IC1903 normal?

Yes

Yes

No

No

No

No sound

from front

speakers

Yes

Muting effect is

on. Check the

FSMUTE line.

Check IC1901

and its

peripheral parts.

Check IC1903

and its

peripheral parts.

Is the pin (52) of

IC2001 in the

"L" state?

Is output at pins

(24) and (25) of

IC1901 normal?

Is output at pins

(1) and (7) of

IC304 normal?

Yes

Yes

No

No

No

Yes

Muting effect is

on. Check the

HP_MUTE line.

Check IC1901

and its

peripheral parts.

Check IC304

and its

peripheral parts.

No sound

from

headphone

TV sound

failure

Is output at pins

(33) and (34) of

IC1901 normal?

Is output at pins

(1) and (7) of

IC3500 normal?

Check IC1901

and its

peripheral parts.

Check IC3500

and its

peripheral parts.

Yes

No

No

No

No sound

from output

line

Check the tuner

and its

peripheral parts.

Yes

No

Is output at pin

(11) of TU1

(Tuner) normal?

Is input at pins

(67) and (69)

of IC1901.

Check IC1901

and its

peripheral

parts.

Check J5003

(Headphone Jack)

and connection

cable.

No

Is output at pins

(8) and (12) of

IC3305 normal?

Check IC3305

and its

peripheral parts.

Check front

speaker and

connection

cable.

Yes

TROUBLE SHOOTING TABLE (Continued)

16