SHARP LC20E1E Service Manual

LC-20E1E

SERVICE MANUAL

S72M2LC20-E1E

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.

CONTENTS

» IMPORTANT SERVICE SAFETY PRECAUTION ........................................................................................2

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

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

» DIMENSIONS ...............................................................................................................................................6

» REMOVING OF MAJOR PARTS..................................................................................................................7

» ADJUSTING PROCEDURE OF EACH SECTION .....................................................................................11

» TROUBLE SHOOTING TABLE ..................................................................................................................14

» CHASSIS LAYOUT.....................................................................................................................................20

» BLOCK DIAGRAM......................................................................................................................................22

» OVERALL WIRING DIAGRAM ...................................................................................................................24

» DESCRIPTION OF SCHEMATIC DIAGRAM .............................................................................................26

» SCHEMATIC DIAGRAM .............................................................................................................................27

» PRINTED WIRING BOARD ASSEMBLIES................................................................................................50

» REPLACEMENT PARTS LIST ...................................................................................................................61

» PACKING OF THE SET..............................................................................................................................75

LC-20E1E

Page

SHARP CORPORATION

LC-20E1E

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),
F6700 (T1.25AL, 250V), F6701 (T1.25AL, 250V),
F6702 (T1.25AL, 250V), F6703 (T1.25AL, 250V) AND
F6704 (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 20" LCD COLOUR TV, Model: LC-20E1E
LCD panel
LCD panel size
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 2.5 W × 2
Speakers 4 × 7 cm 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 13 V, AC 110 V – 240 V, 50/60 Hz
Weight 7.1 kg
Accessories Operation Manual, Remote Control, Batteries,

Advanced Super View & BLACK TFT LCD

19.7"

2

AC adapter, AC cord, Cable clamp

LC-20E1E

Specifications are subject to change without prior notice.

3

LC-20E1E

A

V-IN

1

R

G

B

A

V

-IN

2

S

-V

ID

E

O

V

ID

E

O

L

R

A

U

D

IO

P

O

W

E

R

IN

P

U

T

D

C

1

2

V

L

R

A

U

D

I

O

O

U

T

L

R

AU

D

IO

O

U

T

A

V

-IN

1

R

G

B

A

V

-IN

2

S

-V

ID

E

O

V

ID

E

O

L

R

A

U

D

IO

P

O

W

ER

IN

P

U

T

D

C

13

V

Carrying handle

POWER INPUT

(DC 12V : LC-13E1E/

LC-15E1E)

(DC 13V : LC-20E1E)

AV-IN 1

(21pin Euro-SCART)

S-VIDEO

VIDEO

AUDIO (L)

AUDIO (R)

AV-IN 2

Antenna

AUDIO OUT (L)

AUDIO OUT (R)

Headphones

Rear view

Terminals

CH

MENU

TV/VIDEO

CH

MENU

TV/VIDEO

Volume (–)/(+)

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).

Speaker

Remote sensor window

Remote sensor indicator

A red indicator blinks when the TV set receives the

remote control signal.

Upper control panel

The screen can be adjusted

backwards to an angle between 12

degrees and 35 degrees. The screen

cannot be set up straight. When

changing the angle, make sure to

hold the stand and adjust the screen

to the best viewable angle.

Controls

Note:

Note:

• TV/VIDEO, CH(

)/( ), Volume (–)/(+) and MENU 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.

• The LC-13E1E, LC-15E1E and LC-20E1E have different external dimensions and the positions where the names

of the buttons are displayed also differ but the same operating procedures are followed for all three models.

LC-20E1E

LC-13E1E

LC-15E1E

CH (

)/( )

MENU

TV/VIDEO

(MAIN POWER)

35°

12°

Adjustable range

OPERATION MANUAL

4

E

CH

TV/VIDEO

REVEAL

H

OLD

EN

D

M

MENUSOUND

SU

B

TIT

LE

OK

OK, Programme Table

SUBTITLE

Displays the Teletext

Subtitle directly.

HOLD

Temporarily holds the

current Teletext page.

Mute

Switches the sound on and off.

Yellow,

Timer function Menu

Cyan, Status Display

Turns on the status display

when the menu is not

displayed.

TV/VIDEO

Switches the input source

between AV1, AV2 and

TV mode.

Channel Select

MENU

Displays the TV menu.

Volume (+)/(

-

)

Flashback

Returns to the previous

channel.

Red, Picture Menu

Upwards/ Downwards

Selection, zoom display

function (Teletext mode)

)

END

Returns to normal screen.

)

TEXT

Displays the Teletext mode

screen.

(Power)

SOUND

Switches the sound

mode.

REVEAL

Displays hidden information

such as solutions to riddles

and puzzles.

Right / Left Selection

SUBPAGE

Displays the Teletext

Subpage directly.

ROTATE

Rotates the display in every

direction.

BRIGHT

Selects the brightness

of the display.

Green, Sound Menu

SUBPAGE

TE

X

T

ROTATE

B

R

IG

H

T

T

CH ( )/( )

Displays previous/next page.

(Teletext mode)

Installing Batteries in the Remote Control

Before using the LCD TV set for the first time, install the two R-03 (“AAA” size, UM/SUM-4) batteries supplied

in the remote control. When the batteries become depleted and the remote control fails to operate, replace

the batteries with new R-03 (“AAA” size, UM/SUM-4) batteries.

1

Open the battery cover.

2

Insert two R-03 (“AAA” size,

UM/SUM-4) batteries.

3

Replace the battery cover.

Ë Position the positive and

negative ends of the

batteries as indicated in

the compartment.

Caution!

Precautions regarding batteries

Ë Improper use of batteries can result in a leakage of chemicals and/or explosion. Be sure to follow the

instructions below.

• Place batteries with their terminals corresponding to the (+) and (–) indications.

• Different types of batteries have different characteristics. Do not mix batteries of different types.

• Do not mix old and new batteries. Mixing old and new batteries can shorten the life of new batteries and/

or cause old batteries to leak chemicals.

• Remove batteries as soon as they are depleted. Chemicals that leak from batteries can cause a rash. If

chemical leakage is found, wipe it off with a cloth.

• The batteries supplied with the product may have a shorter life expectancy due to storage conditions.

• If the remote control is not to be used for an extended period of time, remove the batteries from the

remote control.

Ë Engaging the lower

claw with the remote

control, close the

cover.

Ë Slide the cover while

pressing the ( ) part.

|

LC-20E1E

5

LC-20E1E

DIMENSIONS

MENU

TV/VIDEO

CH

Unit: mm

68

493

244

5

103

440

214 187

68

182

AUDIO OUT

100

L

R

AV-IN 1

RGB

AV-IN 1

S-VIDEO

VIDEO

L

AUDIO

R

POWER

INPUT
DC13V

51.5

100

6

REMOVING OF MAJOR PARTS

P6705

SC1202

P4004

SC1203

P6706

SC2001

P1903

SC1602

P3601

Main PWB

P3604

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

2. Remove the two terminal covers.

3. Remove the terminal section fixing screws (2 pcs.).

4. Remove the cabinet B fixing screws (10 pcs.).

5. Remove the cabinet B after opening from the direction of an arrow.

6. Peel off the tape. Remove the reinforcement angle fixing screws (4 pcs.).

7. Remove the top cover fixing screws (2 pcs.).

8. Remove the operation PWB fixing screws (2 pcs.).

9. Peel off the tape.

10. Detach the connector from each PWB.

LC-20E1E

1

4

Terminal
Cover (S)

3

Stand

7

4

2

Cabinet A

2

5

4

Cabinet B

8

Operation PWB

Terminal
Cover (L)

6

Reinforcement
Angle

6

Tape

9

Tape

0

SC1203

SC1203

0

SC1202

SC1201SC1202

Main PWB

Main PWB

0

SC2002

P3601

P3601

R/C, LED PWB

P4004

P4004

P2003

0

P3702

SC2001

SC2001

SC1602

Tuner PWB

0

0

P1903

P1903SC1602

0

0

SC3100

0

P3603P3301P3302P3602

P3604

P3604

7

0

P6705

P6705

0

P6706

P6706

Inverter-A
PWB

0

0

0

Inverter-B
PWB

LC-20E1E

11. Remove the inverter-A PWB fixing screws (2 pcs.).

12. Remove the inverter-B PWB fixing screws (1 pc.).

13. Remove the main PWB fixing screws (3 pcs.).

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

15. Remove the tuner PWB fixing screws (3 pcs.) and detatch the chassis frame cover fixing hooks.

16. Remove the R/C, LED PWB fixing screws (2 pcs.).

Chassis Frame

13

Main PWB

Tuner PWB

11

12

Inverter-A
PWB

15

Inverter-B
PWB

15

14

Chassis
Frame Cover

16

15

R/C, LED PWB

8

» 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.

17. Remove the LCD panel unit fixing screws (4 pcs.).

18. Remove the ITO earth spring fixing screw (1 pc.).

19. Remove the reflection/deflection, prism, diffusion, ITO sheets and diffusion panel.

20. Remove the lamp fixing holder fixing screws (6 pcs.).

21. Detach the lamp unit-A/B.

22. Remove the reflection mirror fixing screws. (6 pcs.).

Back shield Panel
(PSLDM4685CEFW)

LC-20E1E

Diffusion Panel
(PCOVU0107CEZZ)

ITO Sheet
(PSHEP0289CEZZ)

Prism Sheet
(PSHEP0287CEZZ)

20" LCD Panel Unit

17

17

Lamp Fixing Holder
(LHLDZ2176CEZZ)

20

19

Diffusion Sheet
(PSHEP0288CEZZ)

Reflection/Deflection Sheet
(PSHEP0286CEZZ)

Reflection Mirror
(PMiR-0296CEZZ)

20

18

ITO Earth Spring
(MSPRP1220CEFW)

22

21

Lamp Unit-A
(KLMP-A124CEZZ)

Lamp Unit-B
(KLMP-A125CEZZ)

Lamp Fixing Holder
(LHLDZ2176CEZZ)

9

LC-20E1E

»Precautions at the time of the side B(back) service of main unit.

1. Remove only SC2001 of the FFC for connection between Main unit(SC2001) and Tuner unit(SC3100), and con­nect the extended cable (QCNW-A369WJZZ) for service.

2. Remove only P3702 of the FFC f or connection betw een Main unit(P3702) and Tuner unit(P1903), and connect the
extended cable (QCNW-A371WJZZ) for service.

3. Remove only SC2002 of the FFC for connection between Main unit(SC2002) and Tuner unit(SC1602), and con­nect the extended cable (QCNW-A370WJZZ) for service.

4. Remove the R/C, LED unit.
4-1. Peel off the tape.
4-2. Remove a lead from a wire holder.
4-3. Remove the R/C, LED unit fixing screws(2 pcs.).

5. Remove the main unit fixing screws(3 pcs.), a substrate is reversed.

4-1

Tape

Main PWB
(Side B)

SC1203

SC1203

Main PWB

Main PWB

SC1201SC1202SC1202

SC2002

3

P3601P3601

P4004P4004

P2003

P3702

SC2001SC2001

2

P1903SC1602 P1903SC1602

Tuner PWB

1

SC3100

P3603P3301P3302P3602

P3604P3604

Inverter-A

P6705

P6705

PWB

Inverter-B
PWB

P6706

P6706

R/C, LED PWB

4-3

10

4-2

Wire holder

LC-20E1E

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.
LC20E1E AC adaptor: UADP-0241CEPZ
DC power supply: 13V 5.4A

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” keys 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 24 → 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)” keys and mo ves 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 ↔ ...

11

LC-20E1E

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 (E1E).
4-3. Select the inch size (20).
4-4. L ED 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 BB thru CA.

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 9 0

PAL TAMP 21

SECAM TAMP 21
RCU TOF F
GCU T OF F

BCU TOF F
G3 B3 R3 00 00 00
G1 B4 Y 0 0 00 B5

TAMP H

TAMP L

Y Data

(White 75%)

—

5
0

— 3

CA
BB

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.

12

LC-20E1E

1

+B—A D J 160
M O D E L E1E

V E R 1 . 0 0 0

Reset 0

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

Page 1 of the adjustment process

INCH SIZE 20
NTSC PWM FREQ 0C0
PAL PWM FREQ 0BD
NTSC PWM DUTY 0
PAL PWM DUTY 0
T V GAIN OFF
ERROR N O RESET 5
PUBLIC MODE OFF

E1E

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 9, 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 9, page 1 of the adjustment process and set the number to 0 using the volume button.

13

LC-20E1E

No picture and 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

No

Yes

Check J3702 periahery and

connection cable.

Replace F6700~F6704.

Is the pin (34) of IC1201 in

the "H" state?

Is the output of Q3650 in the

"

L

"

state?

Yes

Yes

No

No

No

Yes

Yes

Check the OFL1 line, IC1201

and their peripheral parts.

Check the OFL line, Q3650

and their peripheral parts.

Check T6700~T6709,

Q6700~Q6714 and

connection cable.

Back light lamp failure to light up

Is the primary side of

T6700 ~T6709 periphery

short-circuiting?

Replace the back light lamp

with new one and check

again.

TROUBLE SHOOTING TABLE

14

No picture (1/3)

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 tuner

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-20E1E

15

LC-20E1E

No picture (2/3)

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.

No

No VIDEO 1

output

Check the SY-line,

SC-line and their

peripheral parts.

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 V2VO line

and its peripheral

parts.

Is input at pin (21) of

IC1601 normal?

Check IC1601 and its

peripheral parts.

TROUBLE SHOOTING TABLE (Continued)

16

TROUBLE SHOOTING TABLE (Continued)

No picture (3/3)

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, V122,

V176, V235 and

V255 normal?

Check IC1106,

IC1107, IC1108,

IC1114, IC1115 and

their peripheral parts.

LC-20E1E

17

LC-20E1E

No sound (1/2)

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 Tuner

normal?

Is input at pins

(67) and (69)

of IC1901.

Check IC1901

and its

peripheral

parts.

Check

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)

18

TROUBLE SHOOTING TABLE (Continued)

No sound (2/2)

Check all the settings microprocessor

’s adjust process menu.

Yes

No

No

No sound from SCART

No

SCART sound failure

Yes

No

Check IC1901 and its

peripheral parts.

Is output at pins (36) and (37) of

IC1901 normal?

Check IC1902 and its

peripheral parts.

Is output at pins (1) and (7) of

IC1902 normal?

Check their lines and their

peripheral parts.

Is input at pins (53) and (54) of

IC1901 normal?

Check IC1901 and its

peripheral parts.

Is output at pins (27) and (28) of

IC1901 normal?

LC-20E1E

19

LC-20E1E

CHASSIS LAYOUT

H

G

F

E

MAIN Unit

OPERATION Unit

TUNER Unit

D

C

B

R/C, LED Unit

A

87109654321

20

INVERTER-A Unit

LC-20E1E

INVERTER-B Unit

21

1716 1918151413121110

LC-20E1E

A

L

/

S

N

R

_

BLOCK DIAGRAM

V1.SY

TUNER

TV_V

SIF1/2
AI_L/R

2

C

I

SC_L/R

TV/AV

SELECTOR

IC402

AUDIO AMP

IC1902

ANA_IN1+/2+

SC2_IN_L/R

SC1_OUT_L/R

SC1_IN_L/R

V2_V R/G/B_IN

V1. SC

V1IN

DACM_L/R

MSP

IC1901 DACA_L/R

VPC

CSYNC

2

PROM

E

IC2030

SPI

IC801

V2VO

SYNC SEP

IC401

2

C

I

UART

I2C

SC2_OUT_

2

I

C

CO

2

C

I

MICON
IC2001

Y

L

J5002

J5001

ANTENNA

SCART
(AV1)

AUDIO IN

AUDIO OUT
VIDEO OUT

SDA/RXD

SCL/TXD

VIDEO IN

R/G/B_ST

S

INPUT

VIDEO
(AV2)

INPUT

AUDIO
(AV2)

INPUT

V1.L/R

2

I

C/UART

H

SC3903

G

F

SC5001

E

D

C

B

A

J3702

DC13V

INPUT

PAVCC

SIGVCC

INVVCC

REG

REG

REG

IC1208

IC751

IC703

DC/DC

CONVERTER

T3701

PWM

IC3701

Q3700

+13V

+3.3V

+5V

+5V

+31V
—20V

REG

REG

Q3706

IC1610

IC752

Q3704

IC3702

Q3707

REG

REG

+9V
+8V

+5V

+3.3V

—8V

IC1606

IC1613

+22V

+31V

+5V

+3.3V

+2.5V

22

87109654321

LC-20E1E

CM_L/R

2

C

I

CA_L/R

SC2_OUT_L/R

I2C

OM

030

I

MICON
IC2001

AUDIO AMP

IC304

Y/UV

SYNC SIGNAL

CONTROL SIGNAL

2

C

I

2

E

PROM

IC2004

RESET

RESET

IC2002

L_ERR

AUDIO ACTIVE FILTER

IC1903

AUDIO AMP

IC3500

LCD

CONTROLLER

IC1201

OFL1

OSD R/G/B

R/G/B

OSD/TEXT
SELECTOR

IC1203

TEXT R/G/B

L/R_IN AUDIO

POWER AMP

IC3305

A0_L/R

PAVCC(+13V)

REV

GRADATION
POWER

MPCLK
MPDA

DAC2CS

IC1102~1108
IC1110
IC1112~1115

DAC1CS

DAC

IC1101 1111

FLSP/FRSP

HL/R

R0~7 G0~7 B0~7

V0 V7 V17 V21 V32 V64

V112 V176 V235 V255

VGLCOM

COMMON DRIVE

IC1109

VCOM

CSCOM

SPEAKER

HEADPHONE
JACK

AUDIO OUT

LCD
PANEL

P3301
P3302

J5003

J3902

J3903

SC1201
SC1202

SC1203

P3601

+22V

+31V

+5V

+3.3V

+2.5V

UART

CVBS

TEXT
R/G/B AMP

IC1619 1620

R/G/B

TELETEXT

CPU

IC1601

OFL REVERSE
Q3650

2

C

I

SRAM 2M

FLASH 4M

IC1603

IC1602

OFL

L_ERR

DC/AC
INVERTER
DRIVE

Q6700
~6714

LAMP ERROR
DETECTOR

Q3600 3601

DC/AC
TRANS

INVVCC(+13V)

T6700
~6709

HV1/2/3

BACK
LIGHT
LAMP

P4001

KEY

P4004

REMOTE

CONTROL

RECEIVER

23

1716 1918151413121110