DOWNLOAD Sharp LC-20B5E (serv.man16) Service Manual ↓ Size: 9.62 MB | Pages: 100 in PDF or view online for FREE

Model
LC-20B5E (serv.man16)
Pages
100
Size
9.62 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
lc-20b5e-sm16.pdf
Date

Sharp LC-20B5E (serv.man16) Service Manual ▷ View online

LC-20B5E
SERVICE MANUAL
MODEL
LC-20B5E
SHARP CORPORATION
LCD COLOUR TELEVISION
In the interests of user-safety (Required by safety regulations in some countries) the set should be re-
stored 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 ............................................................................................................................................... 7
»
REMOVING OF MAJOR PARTS .................................................................................................................. 8
»
ADJUSTING PROCEDURE OF EACH SECTION ..................................................................................... 13
»
TROUBLE SHOOTING TABLE ................................................................................................................... 23
»
CHASSIS LAYOUT ..................................................................................................................................... 28
»
BLOCK DIAGRAM ...................................................................................................................................... 30
»
OVERALL WIRING DIAGRAM ................................................................................................................... 32
»
DESCRIPTION OF SCHEMATIC DIAGRAM ............................................................................................. 34
»
SCHEMATIC DIAGRAM ............................................................................................................................. 35
»
PRINTED WIRING BOARD ASSEMBLIES ................................................................................................71
»
REPLACEMENT PARTS LIST .................................................................................................................... 82
»
PACKING OF THE SET .............................................................................................................................. 99
Page
S34P7LC-20B5E
2
LC-20B5E
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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, 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 performed 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.
Use an AC voltmeter having with 5000 ohm per volt, or
higher, sensitivity or measure the AC voltage drop
across the resistor.
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
mA. 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, 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 F3701 (2A, 250V), F3702 (1.25A, 250V),
F6700 (1.25A, 250V), F6701 (1.25A, 250V), F6702
(1.25A, 250V), F6703 (1.25A, 250V) AND F6704
(1.25A, 250V) FUSE.
DVM
AC SCALE
50k ohm
10W
TO EXPOSED
METAL PARTS
CONNECT TO
KNOWN EARTH
GROUND
0.15 
µ
F
TEST PROBE
3
LC-20B5E
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:
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 40°C, we recommend
you to use a dedicated soldering bit, if you are not familiar with how to obtain lead-free wire solder or soldering bit,
contact our service station or service branch 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 wettability, 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 exceeded, remove the bit from the PWB as soon as you confirm the steady soldering
condition.
Lead-free solder contains more tin, and the end of the soldering bit may be easily corroded. Make sure to turn 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 alloyed 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.
Be careful when replacing parts with polarity indication on the PWB silk.
Indicates lead-free solder of tin, silver and copper.
Lead-free wire solder for servicing
Part No.
Description
Code
ZHNDAi123250E
J
φ
0.3mm
250g(1roll)
BL
ZHNDAi126500E
J
φ
0.6mm
500g(1roll)
BK
ZHNDAi12801KE
J
φ
1.0mm
1kg(1roll)
BM
L
F a
4
LC-20B5E
SPECIFICATIONS
Item
20" LCD COLOUR TV, Model: LC-20B5E
LCD panel
20" Advanced Super View & BLACK TFT LCD
Number of dots
921,600 dots
Video colour system
PAL/SECAM/NTSC
TV
TV-Standard (CCIR)
B/G, I, D/K, L, L’
TV-Tuning System
Auto preset 200 ch.
STEREO/BILINGUAL
NICAM, A2 stereo
AUTO PRESET
YES
CATV
~Hyper Band
Brightness
450 cd/m
2
Viewing angles
H: 170
°
 V: 170
°
Audio amplifier
2.1 W 
×
 2
Speakers
ø 5.7 cm 
×
2 pcs.
Terminals
AV-IN1
21 pin Euro-SCART
AV-IN2
S-VIDEO, VIDEO, AUDIO
OUT
AUDIO
Antenna
DIN
Headphones
3.5 mm ø jack (Front)
PC Card slot
PC Card Type 
II
(PC card adapter)
Image File Format
JPEG files complying with DCF format
OSD language
English/German/French/Spanish/Italian/Swedish/Dutch/Russian
Power requirement
DC 12 V, AC 110 V – 240 V, 50/60 Hz
Power consumption
67 W (1.26 W at Standby) : AC 230 V (with AC adapter)
56 W : DC 12 V
Weight
9.2 kg w/o accessories
Accessories
Operation manual, Wireless remote control, Batteries (
×
2), AC adapter, AC cord,
Cable holder
As a part of policy of continuous improvement, SHARP reserves the right to make design and specification changes for the LCD TV set
improvement without prior notice. The performance specification figures indicated are nominal values of production units. There may be
some deviations from these values in individual units.
Page of 100
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Sharp LC-20B5E (serv.man16) Service Manual ▷ Download

  • DOWNLOAD Sharp LC-20B5E (serv.man16) Service Manual ↓ Size: 9.62 MB | Pages: 100 in PDF or view online for FREE
  • Here you can View online or download the Service Manual for the Sharp LC-20B5E (serv.man16) in PDF for free, which will help you to disassemble, recover, fix and repair Sharp LC-20B5E (serv.man16) LCD. Information contained in Sharp LC-20B5E (serv.man16) Service Manual (repair manual) includes:
  • Disassembly, troubleshooting, maintenance, adjustment, installation and setup instructions.
  • Schematics, Circuit, Wiring and Block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Exploded View and Parts List.