LC-20B2E (serv.man9) - Sharp TV Service Manual (repair manual)

lc-20b2e (serv.man9) service manual
Model
LC-20B2E (serv.man9)
Pages
48
Size
4.77 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
lc-20b2e-sm9.pdf
Date

Read Sharp LC-20B2E (serv.man9) Service Manual online

1
LC-20B2E
SERVICE MANUAL
S91A6LC-20B2E
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.
MODEL
LC-20B2E
CONTENTS
»
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 ........................ 24
»
DESCRIPTION OF SCHEMATIC DIAGRAM .. 26
»
SCHEMATIC DIAGRAM
Ë
OPERATION and R/C RECEIVER UNIT ... 27
Ë
MAIN UNIT ................................................ 28
Ë
TUNER UNIT ............................................. 42
Page
Page
Ë
INVERTER-A and INVERTER-B UNIT ...... 44
Ë
JACK UNIT ................................................ 45
»
PRINTED WIRING BOARD ASSEMBLIES ..... 46
»
PARTS LIST
Ë
ELECTRICAL PARTS ................................ 50
Ë
INVERTER-A UNIT .................................... 50
Ë
INVERTER-B UNIT .................................... 50
Ë
MAIN UNIT ................................................ 51
Ë
OPERATION UNIT ..................................... 55
Ë
R/C RECEIVER UNIT ................................ 55
Ë
JACK UNIT ................................................ 55
Ë
CABINET AND MECHANICAL PARTS ..... 56
Ë
CABINET PARTS LOCATION .................... 58
Ë
ACCESSORIES PARTS ............................ 58
Ë
PACKING PARTS ....................................... 58
»
PACKING OF THE SET ................................... 59
SHARP CORPORATION
LCD COLOUR TELEVISION
2
LC-20B2E
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SAFETY NOTICE
Many electrical and mechanical parts in LCD television
have special safety-related characteristics.
These characteristics are often not evident from visual
inspection, nor can protection afforded by them be
necessarily increased by using replacement components
rated for higher voltage, wattage and etc.
Replacement parts which have these special safety
characteristics are identified in this manual; electrical
components having such features are identified by “ 
å
IMPORTANT SERVICE SAFETY PRECAUTION
Ë
Service work should be perfomed only by qualified service technicians who are thoroughly
familiar with all safety checks and the servicing guidelines which follow:
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.
WARNING
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 and 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.
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 and 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 FUSE.  F1 (2.0A, 250V), F2 (1.6A, 250V)
F4 (315mA, 250V) FUSE.
3
LC-20B2E
Specifications
Items
LCD panel
Number of dots
Video colour system
TV-Standard (CCIR)
TV-Tuning System
TV function
STEREO/BILINGUAL
AUTO PRESET
CATV
Brightness
Lamp life
Viewing angles
Audio amplifier
Speakers
AV-IN 1
AV-IN 2
Terminals
OUT
Antenna
Headphones
OSD language
Power requirement
Weight
Accessories
20" LCD COLOUR TV, Model: LC-20B2E
19.7” BLACK TFT LCD
921,600 dots
PAL/SECAM/NTSC
BG/L/DK, I, M, N
Auto preset 197 ch.
NICAM, IGR
Yes
~ Hyper Band
430 cd/m
2
60,000 hours
H: 160°  V: 160°
2.5 W 
×
 2
5 cm ø, 2 pcs.
RGB
S-VIDEO, VIDEO, AUDIO
AUDIO
DIN
3.5 mm ø jack (Rear)
English/German/French/Spanish/Italian/Swedish/Dutch
DC 13 V, AC 110–240 V, 50/60 Hz
8.3 kg, incl. stand, excl. accessories
Remote control, Btteries, AC adapter, AC cord,
Cable clamps
Specifications are subject to change without prior notice.
4
LC-20B2E
Operation Manual
CH
MENU TV/VIDEO
Main unit (front view)
Note:
TV/VIDEOCH(
)/(
), 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.
To change the vertical
angle of the LCD TV set,
tilt the screen up to 10
degrees forward or 20
degrees backward. The
TV set can also be
rotated 90 degrees
horizontally. Please adjust
the angle so that the TV
set can be watched most
comfortably.
Upper control panel
Volume (+)/(–)
CH (
)/(
)
MENU
TV/VIDEO
(MAIN POWER)
Speaker
Speaker
Remote sensor window
(The actual location is not visible.)
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).
Remote sensor indicator
A red indicator blinks when the TV set
receives the remote control signal.
Terminals
Rear view
RGB
POWE
R
INPUT
DC13V
L
R
AV-IN 1
AUDIO
 OUT
VIDEO
S-VIDEO
AUDIOL
R
AV-IN 2
POWER INPUT 
DC 13 V
Antenna
AUDIO OUT (L)
AV-IN 1 
(21-pin Euro-
SCART)
AUDIO OUT (R)
HEADPHONES
VIDEO
AUDIO (L)
AUDIO (R)
S-VIDEO
Carrying handle
i
E
CH
TV/VIDEO
SOUND
END
T
M
MENU
TEXT
(RED)
(GREEN) (YELLOW) (CYAN)
INFO
OK
(Power)
OK, Programme Table
INFO
Turns on the menu
information when
the menu is displayed.
Mute
TEXT
YELLOW, Standard Value
GREEN, Sound Menu
CYAN, Teletext Subtitle
TV/VIDEO
Channel Select
MENU
Volume (+)/(–)
Flashback
Returns to the
previous channel.
RED, Picture Menu
Upward / Downward 
Selection
END, Status Display
Turns on the status display
when the menu is not
displayed.
SOUND
Switches the sound mode.
Right / Left Selection
CH (    )/(    )
Remote control
Page of 48
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Here you can read online and download Sharp LC-20B2E (serv.man9) Service Manual in PDF. LC-20B2E (serv.man9) service manual will guide through the process and help you recover, restore, fix, disassemble and repair Sharp LC-20B2E (serv.man9) LCD. Information contained in service manuals typically includes schematics / circuit diagrams, wiring diagrams, block diagrams, printed wiring boards, exploded views, parts list, disassembly / assembly, pcb.