Sharp LC-20E1H Schematic

LC-20E1H
LC-20E1M

SERVICE MANUAL

S92P6LC-20E1H

LCD COLOUR TELEVISION

LC-20E1H

MODELS

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 ................................................................................................................................... 4

» OPERATION MANUAL ............................................................................................................................ 5

» DIMENSIONS .......................................................................................................................................... 8

» REMOVING OF MAJOR PARTS ............................................................................................................. 9

» ADJUSTING PROCEDURE OF EACH SECTION ................................................................................ 13

» TROUBLE SHOOTING TABLE .............................................................................................................. 18

» CHASSIS LAYOUT ................................................................................................................................ 22

» BLOCK DIAGRAM ................................................................................................................................. 24

» OVERALL WIRING DIAGRAM .............................................................................................................. 26

» DESCRIPTION OF SCHEMATIC DIAGRAM ........................................................................................ 28

» SCHEMATIC DIAGRAM ........................................................................................................................ 29

» PRINTED WIRING BOARD ASSEMBLIES........................................................................................... 48

» REPLACEMENT PARTS LIST............................................................................................................... 60

» PACKING OF THE SET ......................................................................................................................... 71

LC-20E1M

Page

SHARP CORPORATION

LC-20E1H

2

2

LC-20E1M

IMPORTANT SERVICE SAFETY PRECAUTION

Ë

Service work should be perfomed only by qualified ser vice 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, 250V), F3702
(1.6A, 250V), F6700 (1.25A, 250V),

A V

F6701 (1.25A, 250V), F6702 (1.25A,
250V), F6703 (1.25A, 250V) AND
F6704 (1.25A, 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 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 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

Precautions for using lead-free solder

1 Employing lead-free solder

"All PWBs" 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 alloy ed 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.

LC-20E1H
LC-20E1M

Becareful 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

3

LC-20E1H
LC-20E1M

SPECIFICATIONS

Items

LCD panel 19.7 Advanced Super View & BLACK TFT LCD
Number of dots 921,600 dots VGA
Video color systems World multi system

TV Standard
TV Tuning System

TV function

4-LINE DIGITAL COMB FILTER
Brightness
Lamp life
Viewing angles
Audio output
Speakers

Terminals Component
Head phone jack
OSD

LANGUAGE
Power requirement
Weight
Accessories

STEREO/BILINGUAL
Universal R/C for TV only
AUTO PRESET
CATV

AV1
AV2 IN/OUT

Model

I/DK/M/BG
Auto preset tuning
NICAM-BG, I, DK/IGR-BG
Yes
Yes
S1~S41 ch. Hyper Band
Yes
430 cd/m
60,000 Hours
H: 170¡ V: 170¡

2.5 W × 2
(4 × 7 cm), 2 pcs.
Composite Video, S-Video,Audio
Composite Video/ Audio
Y, P

3.5mm ¿ jack (Rear)
English/Chinise/Arabic
DC

7.1 kg, w/o accessories
Wireless Remote control, Batteries, Cable clamp,

AC adapter,AC cord, Operation Manual, Antenna cable

2

B

, PR/Audio

13 V, AC 110—240 V, 50/60 Hz

LC-20E1H/M

Specifications are subject to change without prior notice.

4

OPERATION MANUAL

CH

MENU

TV/VIDEO MAIN POWER

PRESET

1

2

CH

VOL

VOL

MENU

TV/VIDEO

PRESET

1

2

MAIN POWER

PO

W

ER

SLEEP

Upper control panel

LC-20E1H/M

LC-13E1H/M

LC-15E1H/M

MENU

MAIN POWER

TV/VIDEO

CH( )/( )

VOL (

-

)/(+)

LOCATION OF USERS CONTROL

SLEEP indicator

The SLEEP indicator lights up red when the SLEEP

TIMER is set to on.

Remote sensor window

The screen can be

adjusted backwards to an

angle between 12 de-

grees 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.

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).

Note:

•

TV/VIDEO, CH (

)/( ), and VOL (–)/(+) 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 with the remote control.

Main unit (front view)

* The examples used throughout this manual are based on the LC-20E1H/M

model. There may be a slight difference in the illustrations, if you are

using the LC-13E1H/M and LC-15E1H/M models.

Speaker

Adjustable range

Main unit (rear view)

Y

P

B

C

O

M

P

ON

E

N

T

P

R

L

L

R

A

V-I

N

2

/

O

U

T

V

ID

E

O

A

U

D

I

O

R

A

U

D

IO

A

V-

I

N

1

L

R

A

U

D

I

O

S

-

V

I

D

E

O

A

N

T

.

V

I

D

E

O

P

O

W

E

R

I

N

P

U

T

D

C

13V

H

E

A

D

PH

O

N

E

AN

T.

VID

E

O

S

-V

I

D

E

O

AU

D

IO

L

R

H

E

A

D

PH

ON

E

P

O

W

E

R

IN

P

U

T

D

C

1

3V

AV

-IN1

VIDEO

AV-IN1

AUDIO (L)

AUDIO (R)

S-VIDEO

HEADPHONE

Antenna terminal

POWER INPUT

DC 12V(LC-13E1H/M/

LC-15E1H/M)

DC 13V(LC-20E1H/M)

Carrying handle

V

ID

E

O

A

U

D

I

O

L

Y

P

B

P

R

R

A

U

D

IO

L

R

C

O

M

P

O

N

E

N

T

A

V

-IN

2

/OU

T

VIDEO

AV-IN2/OUT

COMPONENT

AUDIO (L)

AUDIO (R)

Y

P

B

P

R

AUDIO (L)

AUDIO (R)

LC-20E1H
LC-20E1M

5

LC-20E1H

Listening with Headphones

LOCATION OF USERS CONTROL (Continued)

Ë Before connecting a connection cord into the rear terminal, remove the

back cover. Push in the tab and pull out the back cover carefully.

Ë To mount the cover, insert the 2 hooks on the bottom of the cover

into the cabinet and press on the upper part of the back cover until

the tab locks in place with a click.

Removing the Back Cover

Ë

Plug the headphone mini-plug into the HEADPHONE jack located on the rear of the TV set.

Headphones

Note:

• Headphones are not included in the supplied accessories.

• No sound will be heard from the main unit speakers when a headphone mini-plug is connected into the

HEADPHONE jack.

" On-screen display

\

Rear terminal

A

V

-

I

N

1

L

R

A

U

D

I

O

S

-

V

I

D

E

O

A

N

T

.
V

I

D

E

O

P

O

W

E

R

I

N

P

U

T

D

C

1

2

V

H

E

A

D

P

H

O

N

E

Y

P

B

C

OM

P

O

N

E

N

T

P

R

L

L

R

A

V

-

IN

2

/

OU

T

V

I

D

E

O

A

U

D

I

O

R

A

U

D

IO

60

VOLUME

A

V

-

I

N

1

L

R

AU

D

I

O

S

-

V

I

D

E

O

A

NT

.
V

I

D

E

O

P

O

W

E

R

I

NP

UT

D

C

1

3

V

H

E

A

D

P

H

O

N

E

Remote control

CH

VOL

LANGUAGE DIS.MODE

DISPLAY

BRIGHTSLEEP

MENU

POWER

MPX

-/--

TV

VIDEO

MENU SLEEP

MENU cursor

(Right/Left Selection)

VOL (+)/(–)

LANGUAGE

POWER

TV VIDEO

DIS.MODE

MENU cursor

(Upward/Downward Selection)

CHANNEL SELECT

CH ( )/( )

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...Removes display.

Press....Stops sound.

Press again...Returns

sound to previous level.

MPX

Switches Audio mode.

BRIGHT

The brightness can be

switched between 3 levels.

MUTE

LC-20E1M

6

LC-20E1H

CONNECTING WITH EXTERNAL DEVICES

You can enjoy picture and sound by connecting a VCR or a home video game system to the terminals

located on the rear of the TV set.

When connecting an external device, turn off the power of the main unit first to prevent any possible

damage.

Note:

:

• For the cable, use a commercially available audio/video cord.

• Only connect audio/video signals to AV-IN1 and AV-IN2/OUT terminals. Connecting other signals may result in

a malfunction.

• AV-IN1 has 2 video input terminals: VIDEO and S-VIDEO. When you connect external devices to both terminals

(and if you select AV-IN1), you can only view pictures from the S-VIDEO terminal. To view the picture from the

VIDEO terminal, do not connect any external devices to the S-VIDEO terminal.

• For more information about external device connections, see the manuals of your external devices.

<Example>

• Camcorder

• Home video game system

External devices that can be connected

to COMPONENT terminal

Example of external devices that can be connected

External devices that can be connected

to AV-IN2 terminal

* If your external device has a component

terminal, COMPONENT connection is

recommended (you can view high-quality

pictures).

<Example>

• DVD, etc.

<Example>

• VCR

* If your external device has an S-Video terminal,

S-VIDEO connection is recommended.

External devices that can be connected

to AV-IN1 terminal

Y

P

B

C

O

M

P

O

N

E

N

T

P

R

L

L

R

A

V

-I

N

2

/

O

U

T

V

ID

E

O

A

U

D

I

O

R

A

U

D

I

O

A

V

-

IN

1

L

R

A

U

D

I

O

S

-

V

ID

E

O

A

N

T

.

V

I

D

E

O

P

O

W

ER

I

N

P

U

T

D

C

1

2

V

H

E

A

D

P

H

O

N

E

CH

VOL

LANGUAGE DIS.MODE

DISPLAY

BRIGHTSLEEP

MENU

POWER

MPX

-/--

TV

VIDEO

MENU

'

/

"

\

/

|

MENU

MENU

SLEEP TIMER

PICTURE

FEATURE

CH-SETTING

SELECT: ENTER:

EXIT:

SELECTING THE MENU ITEMS

• This LCD TV set allows you to adjust the picture and sound, and set the channels and other features

using the On-Screen Display. Select the desired menu item by following the steps below and then refer

to the indicated page for details.

SLEEP TIMER

menu

PICTURE menu

(TV mode)

FEATURE menu

CH-SETTING

menu

1

Press MENU to display the MENU

screen.

2

Press

'

/

"

to select the desired

menu item.

•

The “

” mark moves up or down.

•

The “

” mark indicates the selected

menu item.

3

Press

\

/

|

to enter.

• The TINT display only appears when

the COLOUR SYSTEM sets N358 or

N443 in the NTSC mode.

• The displayed items differ depending

on the setting conditions.

• The selected item changes to yellow.

• Items in purple cannot be selected.

(AV mode)

Selecting a Menu Item

Note:

* The screen indications shown above are larger than actual for easy reading.

MENU

SELECT:

ADJUST:

EXIT:

CH-SETTING

RETURN

POSITION [CH15 ]

COLOUR SYSTEM [AUTO ]

SOUND SYSTEM [B/G ]

SKIP [OFF ]

FINE [783.25MHz]

NICAM [ON ]

IGR [ON ]

PICTURE (TV)

RETURN

CONTRAST [ 3 0 ]

COLOUR [ 0]

BLACK LEVEL [ 0]

SHARPNESS [ 0 ]

RED-BLUE [ 0 ]

GREEN [ 0]

RESET

MENU

SELECT: ENTER:

EXIT:

00000

0

PICTURE (AV1/AV2/COMPONENT)

RETURN

CONTRAST [ 3 0 ]

COLOUR SYSTEM [AUTO]

COLOUR [ 0]

BLACK LEVEL [ 0 ]

SHARPNESS [ 0 ]

RED-BLUE [ 0 ]

GREEN [ 0]

RESET

MENU

SELECT: ENTER:

EXIT:

TINT [ 0]

0000000

FEATURE

RETURN

BRIGHTNESS [BRIGHT ]

AUTO POWER OFF [OFF ]

DISPLAY MODE [NORMAL ]

AV2 IN/OUT [IN ]

BLUE BACK [ON ]

LANGUAGE [ENGLISH]

MENU

SELECT:

ADJUST:

EXIT:

SLEEP TIMER

RETURN

SLEEP TIMER [---REMAIN]

MENU

SELECT:

ADJUST:

EXIT:

LC-20E1M

7

LC-20E1H
LC-20E1M

DIMENSIONS

Unit: mm

VOL

2

MAIN POWER

1

PRESET

P

S

O

L

E

W

E

P

ER

8

REMOVING OF MAJOR PARTS

Digital

P6705

SC1202

P4004

SC1203

SC2001

SC3403

P6706

P3704

P3602

P3500

P3504

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. Remove the reinforcement angle fixing screws (4 pcs.).

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

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

9. Detach the connector from each PWB.

LC-20E1H
LC-20E1M

1

4

Terminal
Cover (S)

3

Stand

4

2

Cabinet A

2

5

4

Cabinet B

Terminal
Cover (L)

6

Reinforcement
Angle

7

9

SC1203

SC1203

9

SC1202

Digital

Digital
PWB

P4004

P4004

SC1201SC1202

9

9

P2004

P2003

SC2001

SC2001

Analog
PWB

P3503

P3601

9

9

P3500

P3500

R/C, LED PWB

8

P3602

P3602

9

SC3403

SC3403

Control PWB

P3703

9

P3702

P3504

P3504

9

P3704

P3704

9

P6705

P6705

P6706

P6706

Inverter-A
PWB

9

9

9

Inverter-B
PWB

LC-20E1H
LC-20E1M

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

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

12. Remove the digital PWB fixing screws (3 pcs.).

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

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

Chassis Frame

12

Digital PWB

Analog PWB

10

11

Inverter-A
PWB

13

Inverter-B
PWB

13

Chassis
Frame Cover

14

13

R/C, LED PWB

10

» Precautions in handling the LCD panels

20

19

18

16

17

18

15

15

Back Shield Panel
(PSLDM4685CEFW)

Reflection Mirror
(PMiR-0296CEZZ)

Lamp Fixing Holder

(LHLDZ2176CEZZ)
Diffusion Panel
(PCOVU0107CEZZ)

ITO Sheet
(PSHEP0289CEZZ)

Prism Sheet
(PSHEP0287CEZZ)

20" LCD Panel Unit

Reflection/Deflection Sheet
(PSHEP0286CEZZ)

Diffusion Sheet
(PSHEP0288CEZZ)

ITO Earth Spring
(MSPRP1220CEFW)

Lamp Fixing Holder
(LHLDZ2176CEZZ)

Lamp Unit-B
(KLMP-0125CEZZ)

Lamp Unit-A
(KLMP-0124CEZZ)

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 panel unit fixing screws (4 pcs.).

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

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

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

19. Detach the lamp unit-A/B.

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

LC-20E1H
LC-20E1M

11

LC-20E1H

SC1202

SC1203

SC2001

SC3403

P6706

P3602

P3500

P3504

Digital
PWB

LC-20E1M

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

1. Remove only SC2001 of the FFC for connection between Digital unit(SC2001) and Analog unit(SC3403), and
connect the extended cable (QCNW-A324WJZZ) for service.

2. Remove only P2004 of the Cable f or connection between Digital unit(P2004) and Analog unit(P3702), and connect
the extended cable (QCNW-A552WJZZ) for service.

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

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

Digital PWB
(Side B)

SC1203

SC1203

R/C, LED PWB

SC1202

Digital

Digital

PWB

PWB

SC1201SC1202

P2003

3-2

P3500

P3500

P2004

2

Analog
PWB

P3503

SC2001

SC2001

P3601

P3602

P3602

4

1

SC3403

SC3403

P3703

P3702

P3704

P3704

3-1

Inverter-A

P6705

P6705

PWB

P3504

P3504

Inverter-B
PWB

P6706

P6706

Wire Holder

12

LC-20E1H
LC-20E1M

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-0241CEPZ
DC power supply: 13 ± 0.5V 5.4A

[1] Adjustment Procedure

1-1. Adjusting the checker

Turning on the power (initialization) → Setting the model and size in inches → Transferring the model-specified
data to the E

1-2. Adjusting the finish process

Reassembling the set → Turning on the power → Calling the adjustment process mode (using the remote
controller) → Adjusting the counter bias, TV contrast and white balance

[2] Calling the MAIN adjustment process mode

There are the following two ways to choose from.

• Set the Pin (81) (KEY4) or Pin (82) (KEY5) of IC2001 (microprocessor) to "L", turn on the power.

• For servicing, hold down the TV/VIDEO and MENU keys at once, and turn on the POWER switch. (Make sure

the process mode "K" appears at the top left of the screen.) Then press the CH DOWN and VOL DOWN keys
at once. (Make sure the adjustment process mode screen shows up.) To quit this mode, turn off the power. (Or
turn off the POWER switch or use the remote controller’s OFF key.)

2

PROM (I2C) → Calling the adjustment process mode → Starting the adjustment (+B adjustment)

[3] Using the keys for the adjustment process

Selecting a reception channel

• Using the CH UP/DOWN key, turn up and down reception (broadcasting) channels.
Just click on the key, and channels are selected on by one.
Hold down the key, and the next receivable channel is searched up and down.

• Adjustment items
Adjust each of the items by using the MENU SELECT, CURSOR UP/DOWN and VOL UP/DOWN keys (on the
set or on the remote controller).

• Select an adjustment item using the CURSOR UP/DOWN key.

• An adjustment item is toggled on and off by activating the MENU SELECT key (next item).

Let’s suppose that the item at the bottom of a page is now selected. When the MENU SELECT key is activated
here, the item at the top of the next page will be selected.

[4] Initialization

4-1. Set pins (81) and (82) of IC2001 (microprocessor) to GND. Turn on the power.
4-2. Select a model number (E1H).
4-3. Select the inch size (20).

13

LC-20E1H
LC-20E1M

[5] Adjustment

5-1. +B adjustment (R3760 Variable resistor)

1) Receive the colour bar signal.

2) Adjust the voltage at pin (2) of P3702 to 5.00 ± 0.02 V.
Note: The 5.0 V level is used as reference for all the line voltages. Make this adjustment as precisely as

possible.

5-2. Counter bias adjustment: COM BIAS on page 2

Adjust the "COM BIAS" setting until the contrast gets optimum (the black portion blackest). The adjustment
guideline is around 96.

5-3. TAMP adjustment

1) Feed the colour bar pattern signal.

2) See if the "Y" reading on adjustment process page 2 is within the range shown below. If not, adjust the "NTSC
TAMP" setting to bring the "Y" reading within the specified range.

Model LC20E1H/M

Adjustment value BB~CA

3) If the "NTSC TAMP" setting has been readjusted, write down its new setting in the "PAL TAMP", "SECAM
TAMP", "PAL-M TAMP" and "PAL-N TAMP" items manually.

(Page 2 of adjustment process 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
NTSC TAMP 24

PAL TAMP 24
SECAM TAMP 24

PAL -M TAMP 24

PAL -N TAMP 24
RCUTOF F
GCU TOF F

BCU TOF
G3 B3 R3 00 00 00
G1 B4 Y 0 0 00 C6

TAMP H

TAMP L

F

Y Data

(White 75%)

6

9

–

5
0

+3

CA
BB

5-4. White balance adjustment

1) Feed the monoscope pattern signal.

2) Adjust the "RCUTOFF" and "BCUTOFF" settings on adjustment process page 2 to achieve the color at the same
level as with the standard set.

Note: Keep the "RCUTOFF" and "BCUTOFF" settings as an odd number, whenever possible, in the range below.

• • • -9, -7, • • • -1, +1, • • • +7, +9 • • •
If set to an even number, horizontal streaks may occur with a specific-gradation monochrome signal.

14

5-5. Screen position adjustment (Only for LC-20E1H)

1) Set the value of "PAL SFIF" setting in page 13 of adjustment process as "13" from "17".

(Page 13 of adjustment process 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

31

PAL TV COLOR
PAL AV COLOR
PAL TV T I NT
PAL TV
PAL BRI GHTNESS
PAL
PAL TV H - PEAK I NG
PAL AV
PAL TV AVO TSRTA
PAL SF I F
PAL SC I NC1
PAL TV LDL Y
PAL TV

­PEAKING F I LTER

-

TINT

H-PEAKING

LDLY

LC-20E1H
LC-20E1M

3000
3000

+70
+70

+8

0
3

3
512
13
9513

-2

-2

Set the "PAL SFIF"
setting to "13"

15

LC-20E1H
LC-20E1M

[6] Lamp error detection

6-1. 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.)

6-2. Countermeasures
6-2-1. 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.

6-2-2. 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 8, page 1 of the adjustment process and set the number to 0 using the volume button.

Page 1 of the adjustment process

1

M O D E L E1H
I N C H S I Z E 20
N T S C P W M F R EQ 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
E R R O R N O R E S E T 5
P U B L I C M O D E ON

Reset 0

E 1 H V E R 1. 0 0

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

[7]. Public mode

• How to enter into PUBLIC MODE

1. Turn off TV by pressing MAIN POWER switch.

2. While pressing at same time VOL(+) key and CH(')key, press MAIN POWER switch for more than 2 seconds.
TV will turn on, and you will see the screen display a setting of PUBLIC MODE.

16

• Setting screen of “PUBLIC MODE”

PUBLIC MODE
MAXIMUM VOLUME [ 60]
VOLUME FIXED [VARIABLE]
REMOTE CONTROL [RESPOND]
USER CONTROL [RESPOND]
ON SCREEN DISPLAY [YES ]
AV1 INPUT [NORMAL ]
RESET
ENTER

LC-20E1H
LC-20E1M

1 ↔ 2 ··· ↔ 59 ↔ 60
VARIABLE ↔ FIXED
RESPOND ↔ LIMITED
RESPOND ↔ NO RESPOND
YES ↔ NO
NORMAL ↔ START ↔ AV1 FIXED

Factory setting

Adjust setting

1. You can select each item of functions by pressing cursor UP/DOWN keys or CH '/" Keys on the remote
control or CH'/" keys on the LCD TV. The letter of selected item turns to yellow colour when you selected
it.

2. The setting position of each item of functions are made by pressing cursor RIGHT/LEFT keys on the remote
control or VOL (+)(-)keys on the LCD TV.

3. Select ENTER position after you set all functions, and press cursor RIGHT/LEFT keys on the remote control
or VOL(+)(-)keys on the LCD TV for confirmation.
Unless otherwise you make ENTER confirmation, the settings will not be memorized.

6-functions of Public Mode settings expand for public application

1. MAXIMUM VOLUME (1—————60)
You can set the maximum volume at your desire level.

2. VOLUME FIXED (VARIABLE / FIXED)
You can fix the sound volume at your desire level.
When you set to "FIXED", the sound volume which you just set is fixed.

3. REMOTE CONTROL (RESPOND / LIMITED)
If you set "LIMITED", remote control keys of POWER, CH'/", VOL(-)/(+) and BRIGHT keys are responded,
but other keys are not responded.
This is a position that you can not make MENU adjustments.

4. USER CONTROL (RESPOND / NO RESPOND)
"NO RESPOND" means that the TV does not respond when you press a user control buttons except main power
button on the main unit.

5. ON SCREEN DISPLAY (YES / NO)
If you set "NO" position, OSD will not appear.

6. AV1 INPUT (NORMAL / START / AV1 FIXED)
Some application use DVD or VCR connecting to AV1 input of our monitor and you will not want to change it
to other mode, such as Component or AV2 input.
You can set the position of input "AV1 FIXED".
For other application that you want to start AV1 every time when you press power button, and you may select
other input mode after then, set it at "START" position.

7. RESET
You can cancel all Public Mode settings. (It returns to the factory setting.)

8. ENTER
You make sure after you have specified all functions, then press the enter key. Unless otherwise you press the
enter key, all positions that you have selected will not be set.

17

LC-20E1H
LC-20E1M

TROUBLE SHOOTING TABLE

No or Wrong
Picture

Does the IC801
test pattern appear
properly?

Yes

Check the IC801 signal
output line, IC801 itself
and its peripheral
circuits.

Are the waveforms at the signal
input pins of IC801 as specified?
TV/Composite … Pin (73)
S Video … Pins (71) and (72)
Component … Pins (4), (5), (6)
and (75)

Yes

No

Does the IC1201 test
pattern appear
properly?

Yes

Check IC1201 and its
peripheral circuits as
well as the LCD panel
voltage and waveform.

No

Are the waveforms at
pins (10), (11), (13),
(15) and (17) of IC1201
as specified?

Yes

No

No

Check the related lines,
IC801 itself and its
peripheral circuits.

Check IC801 and its
peripheral circuits.

Check the IC801 signal
input line.

18

Check all the settings on the microprocessor s adjust process menu.

No picture

No picture

at all

Yes

No

Are inputs

and outputs

of IC801 as

specified?

Does the LCD

controller test

pattern

appear?

Does the

video decoder

test pattern

appear?

Check IC402

and its

peripheral

parts.

Check

IC1201, its

peripheral

circuits and

the LCD

panel.

Check IC801

and its

peripheral

circuits.

Yes

No

No

No VIDEO

1 or 2

output

No

Are inputs

and outputs

of IC402 as

specified?

Check IC402

and its

peripheral

parts.

Is input at Pin

(73) of IC801

as specified?

Check IC801,

AV1 line and

their

peripheral

parts.

Yes

No

No S

VIDEO

output

No

COMPONENT

output

No

Are inputs at

Pins (71) and

(72) of IC801

as specified?

Check

SC3405, SY

line, SC line

and peripheral

parts.

No

Is input at

Pins (4), (5),

(6) and (75)

of IC801 as

specified?

Check J3404,

DVD-Y line,

PB line, PR

line and

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

(3) 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?

Yes

Check the

line in

question.

TROUBLE SHOOTING TABLE (Continued)

LC-20E1H
LC-20E1M

19

LC-20E1H

No picture and sound

No colour

No TV colour

No S-VIDEO colour

Yes

No

Do F3701and F3702

function?

Check all the settings on the microprocessor s adjust process menu.

No

Are secondary outputs

(+38V, +9V, +5V, -8V, -20V)

of T3701 as specified?

Yes

Are the oscillation waveform

at T3701 s primary side as

specified?

Yes

No

Disconnect F3701and

F3702. Is the load side

short-circuited?

Yes

No

Is any of T3701 s primary

side, Q3700 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 T3701.

Fluorescent lamp

Yes

No

Do F6700, F6701,

F6702, F6703, and

F6704 function?

Yes

No

Is Pin (34) of IC1201 at H ?

Yes

No

Are the oscillation waveforms

at the primary side of T6700,

T6702, T6704, T6706, and

T6708 as specified?

Yes

Replace F6700, F6701,

F6702, F6703, and F6704.

No

Is input at Pin (71) of IC801

as specified?

Check SC3405, SC line and

peripheral parts.

Yes

Check the line, IC1201 and

its peripheral parts.

Check Q6700 - 6714, T6700

- 6709 and their peripheral

parts.

Replace the fluorescent lamp

and check the oscillation

waveform again.

No VIDEO colour

Check all the settings on the microprocessor s adjust process menu.

No COMPONENT colour

No

Is input at Pins (4) and (6) of

IC801 as specified?

Check J3404, PB line, PR line

and peripheral parts.

LC-20E1M

TROUBLE SHOOTING TABLE (Continued)

20

TROUBLE SHOOTING TABLE (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 IC3301/

IC3303 as

specified?

Yes

No

Are inputs at

Pins (2) and (4)

as well as

outputs at Pins

(8) and (12), all

of IC3305, as

specified?

Muting effect is

on. Check the

FSMUTE line.

Check IC3301,

IC3303 and

their peripheral

parts.

Yes

No

Are input and

output of

IC3304 as

specified?

Check IC3304

and its

peripheral parts.

Check the line

in question,

IC3301 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 Q2007,

J3500 harness

and their

peripheral parts.

No sound

from output

line

Yes

No

Is Pin (58) of

IC2001 at L ?

No

Are outputs at

Pins (14) and

(15) of IC3501

as specified?

Yes

Check the line

in question.

Check the

LMUTE line.

Check IC3501,

IC3304 and its

peripheral

parts.

TV sound

failure

Yes

No

Is output at Pins

(15) and (16) of

tuner as

specified?

No

Is input at Pin

(67) of IC3304

as specified?

Yes

Check IC3304,

X3301 and

their peripheral

parts.

Check the

tuner and its

peripheral

parts.

Check Q3201,

Q3202 and

their peripheral

parts.

LC-20E1H
LC-20E1M

21

LC-20E1H
LC-20E1M

CHASSIS LAYOUT

H

DIGITAL Unit

G

F

CONTROL Unit

E

D

C

B

ANALOG Unit

R/C, LED Unit

A

87109654321

22