LC-20E1E (serv.man2). Precautions, operations, dimensions, removing major parts, adjustment procedure and troubleshooting table - Sharp TV Service Manual (repair manual)

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Many electrical and mechanical parts in LCD television
have special safety-related characteristics.
These characteristics are often not evident from visual
inspection, nor can protection afforded by them be
necessarily increased by using replacement components
rated for higher voltage, wattage, etc.
Replacement parts which have these special safety
characteristics are identified in this manual; electrical
components having such features are identified by “ 

å

”

Ë

and shaded areas in the 

Replacement Parts Lists and

Schematic Diagrams.
For continued protection, replacement parts must be
identical to those used in the original circuit.
The use of a substitute replacement parts which do not
have the same safety characteristics as the factory
recommended replacement parts shown in this service
manual, may create shock, fire or other hazards.

1. For continued safety, no modification of any circuit

should be attempted.

2. Disconnect AC power before servicing.

TO EXPOSED
METAL PARTS

CONNECT TO
KNOWN EARTH
GROUND

•

Use an AC voltmeter having with 5000 ohm per volt, or
higher, sensitivity or measure the AC voltage drop
across the resisor.

•

Connect the resistor connection to all exposed metal
parts having a return to the chassis (antenna, metal
cabinet, screw heads, knobs and control shafts,
escutcheon, etc.) and measure the AC voltage drop
across the resistor.
All checks must be repeated with the AC cord plug
connection reversed. (If necessary, a nonpolarized
adaptor plug must be used only for the purpose of
completing these checks.)
Any reading of 0.75V peak (this corresponds to 0.5
milliamp. peak AC.) or more is excessive and indicates
a potential shock hazard which must be corrected
before returning the monitor to the owner.

1. Inspect all lead dress to make certain that leads are

not pinched, and check that hardware is not lodged
between the chassis and other metal parts in the
receiver.

2. Inspect all protective devices such as non-metallic

control knobs, insulation materials, cabinet backs,
adjustment and compartment covers or shields,
isolation resistor-capacitor networks, mechanical
insulators, etc.

3. To be sure that no shock hazard exists, check for

leakage current in the following manner.

•

Plug the AC cord directly into a 110~240 volt AC outlet,
and connect the DC power cable into the receiver's
DC jack. (Do not use an isolation transformer for this
test).

•

Using two clip leads, connect a 50k ohm, 10 watt resistor
paralleled by a 0.15µF capacitor in series with all
exposed metal cabinet parts and a known earth ground,
such as electrical conduit or electrical ground connected
to an earth ground.

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.

DVM

AC SCALE

50k ohm

10W

0.15 

µ

F

TEST PROBE

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

IO

 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

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).

A red indicator blinks when the TV set receives the

remote control signal.

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.

•

,

),

and

 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.

35

°

12

°

Adjustable range

E

CH

TV/VIDEO

REVEAL

H

O

LD

E

N

D

M

MENU

SOUND

SU

BTITLE

OK

Displays the Teletext

Subtitle directly.

Temporarily holds the 

current Teletext page.

Switches the sound on and off.

Turns on the status display

when the menu is not

displayed. 

Switches the input source 

between AV1, AV2 and

TV mode. 

Displays the 

TV menu.

Returns to the previous

 channel. 

(Teletext mode)

Returns to normal screen.

Displays the 

T

e

letext mode

screen. 

Switches the sound

mode.

Displays hidden information

such as solutions to riddles 

and puzzles. 

Displays the 

T

e

letext

Subpage directly

.

Rotates the display in every

direction. 

Selects the brightness

 of the display.

SUBPAGE

TEXT

ROTATE

BRIGHT

T

Displays previous/next page.

(Teletext mode) 

Unit: mm