LC-20M4E (serv.man8) — Sharp TV Service Manual (repair manual)

Model
LC-20M4E (serv.man8)
Pages
50
Size
2.04 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
lc-20m4e-sm8.pdf
Date

View Sharp LC-20M4E (serv.man8) Service Manual online

1
LC-20M4E
S01C1LC-15B2E
LCD AV MONITOR
SERVICE MANUAL
MODEL
LC-20M4E
In the interests of user-safety (Required by safety regula-
tions in some countries) the set should be restored to its
original condition and only parts identical to those specified
be used.
SHARP CORPORATION
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 DIAGRAMS ........................................................................................................................... 20
»
DESCRIPTION OF SCHEMATIC DIAGRAM ..................................................................................... 22
»
SCHEMATIC DIAGRAMS ................................................................................................................... 24
»
PRINTED WIRING BOARD ASSEMBLIES ........................................................................................ 44
»
PARTS LIST
Ë
ELECTRICAL PARTS ..................................................................................................................... 49
MAIN UNIT ..................................................................................................................................... 49
JACK UNIT ..................................................................................................................................... 54
INVERTER UNIT ............................................................................................................................ 54
SWITCH UNIT ................................................................................................................................ 55
Ë
CABINET PARTS LIST ................................................................................................................... 56
Ë
SUPPLIED ACCESSORIES PARTS .............................................................................................. 56
Ë
PACKING PARTS ........................................................................................................................... 56
Ë
CABINET AND MECHANICAL PARTS .......................................................................................... 57
»
PACKING OF THE SET ...................................................................................................................... 58
 CONTENTS
TENTATIVE
LC-20M4E
2
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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
DVM
AC SCALE
50k ohm
10W
0.15 
µ
F
TEST PROBE
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 0.15
µ
F 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-20M4E
SPECIFICATIONS
Items ........................................................... 20" LCD AV MONITOR, Model: LC-20M4E
LCD panel ..................................................................................... 20" BLACK TFT LCD
Number of pixels ............................................................... 921,600 (640 x 3 x 480) dots
Low reflection .................................................................................................. Non-glare
Brightness ....................................................................................................... 430 cd/m
2
Viewing angles
Left to right ......................................................................................................... 160
°
Upper to lower ................................................................................................... 160
°
Lamp life ....................................................................... 40,000 hours (at normal mode)
Video colour system ............................ N358/N443/PAL/PAL-M/PAL-N/PAL-60/SECAM
Audio amplifier ...................................................................... 4.0 W (0.7 W x 2 + 2.6 W)
Speakers
Full range ................................................................................ 3  x 4 cm Oval, 2 pcs.
Woofer ......................................................................................... 8 cm Round, 1 pc.
Terminals
AV 1 IN ........................................ Video Composite (BNC type), S-video, Audio R/L
Component input, Y/P
B
 (C
B
)/P
R
(C
R
) (BNC type)
AV 2 IN/OUT ............................................. Video Composite (BNC type), Audio R/L
Headphone jack ................................................................................... 3.5 mm 
φ
 jack
Power supply
DC operation ................................................................................................ DC 13 V
AC operation ........................................... AC 110 - 240 V, 50/60 Hz with AC adapter
Appearance
Exterior colour .................................................................................................. Silver
Outside dimensions ........................................... 460  (W) x 437.5 (H) x 186 (D) mm
Net weight ........................................................ 8.6 kg, incl. stand, excl. accessories
6.1 kg, excl. stand
Accessories
Operation manual .................................. Language: English/German/French/Italian/
Spanish/Swedish/Dutch
Remote Control ....................................................................... Infrared wireless type
AC adapter ......................................................................................... Auto-wide type
AC cord .............................................................................................................. 1 pc.
Batteries ....................................................... R-03 (UM/SUM-4) Dry Battery x 2 pcs.
Cable clamp ..................................................................................................... 2 pcs.
OSD language .............................................................. English/German/Dutch/French/
Italian/Spanish/Swedish
As a part of policy of continuous improvement, SHARP reserves the right to make design and
specification changes for product improvement without prior notice.  The performance specifi-
cation figures indicated are nominal values of production units. There may be some deviations
from these values in individual units.
LC-20M4E
4
Main unit (rear view)
Power
button
button
buttons
Sound 
 button
Infrared transmitter window
button
 buttons
Menu control section
OPERATION MANUAL
Main unit (front view)
Remote Control
Speaker
switch
 
button
buttons
buttons
button
MENU
+
AV INPUT
SELECT
Speaker
To change the vertical angle of
the LCD monitor, tilt the screen
up to 10 degrees backward.
The monitor can also be
rotated 20 degrees horizontally.
Please adjust the angle so that
the monitor can be watched
most comfortably.
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).
The red indicator
flashes when the
monitor receives
the signal from the
remote control.
Stand
Rear Speaker
(woofer)
Can also be used as video
output terminals.
 
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Download Sharp LC-20M4E (serv.man8) Service Manual (Repair Manual)

Here you can view online or download Sharp LC-20M4E (serv.man8) Service Manual in pdf. This Service Manual can help you recover, restore, fix, disassemble and repair Sharp LC-20M4E (serv.man8) LCD. Information contained in Sharp LC-20M4E (serv.man8) service manual (repair manual) typically includes:

  • Disassembly, troubleshooting, programming, maintenance, remote, adjustment, installation and setup instructions.
  • Schematics, wiring and block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Parts list (bill of materials).