Sharp AQUOS LC-20B5M Manuale utente
LC-20B5M
SERVICE MANUAL
MODEL LC-20B5M
SHARP CORPORATION
LCD COLOURTELEVISION
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 ...................................................................................................................24
»CHASSIS LAYOUT .....................................................................................................................................28
»BLOCK DIAGRAM ......................................................................................................................................30
»OVERALL WIRING DIAGRAM ...................................................................................................................32
»DESCRIPTION OF SCHEMATIC DIAGRAM .............................................................................................34
»SCHEMATIC DIAGRAM .............................................................................................................................35
»PRINTED WIRING BOARD ASSEMBLIES ................................................................................................75
»REPLACEMENT PARTS LIST....................................................................................................................86
»PACKING OF THE SET ............................................................................................................................101
Page
1st Edition
2
LC-20B5M
12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212
1
234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121
2
12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212
12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212
1
234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121
2
12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212
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
ËService 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.
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 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 RETURNINGTHE 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
SAMETYPE 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
0.15 µF
TEST PROBE
3
LC-20B5M
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 φ0.3mm 250g(1roll) BL
ZHNDAi126500E J φ0.6mm 500g(1roll) BK
ZHNDAi12801KE J φ1.0mm 1kg(1roll) BM
LFa
4
LC-20B5M
SPECIFICATIONS
LCD panel
Number of pixels 921,600 dots
Video colour systems World multi system
TV Standard (CCIR) I/DK/M/BG
TV Tuning System Auto preset tuning
TV function STEREO/BILINGUAL NICAM-BG, I, DK/A2 stereo-BG
AUTO PRESET Yes
CATV S1~S41 ch. Hyper Band
4-LINE DIGITAL COMB FILTER Yes
Brightness 450 cd/m
2
Lamp life 60,000 hours*
Viewing angles H: 170°V: 170°
Audio output 2.1 W 2×
×
Speakers 5.7 cm ø, 2 pcs.
AV1 Composite Video, S-Video, Audio
AV2 IN/OUT Composite Video, Audio IN/Composite Video, Audio OUT
COMPONENT Y, PB, PR/Audio
Headphone jack 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/Chinese/Arabic
Power requirement DC 12 V, AC 110–240 V, 50/60 Hz
Power Consumption For Asia
63 W (1.2 W Standby):
AC 230 V (With AC adapter)
For Australia
65 W (1.2 W Standby):
AC 230 V (With AC adapter)
55W : DC 12 V
Weight 9.2 kg w/o accessories
Accessories Remote control, Batteries ( 2), Antenna cable, AC adapter,
AC cord, Cable holder, Operation manual
■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.
MODEL LC-20B5M
ITEMS
Terminals
19.7" (50 cm) Advanced Super View & BLACK TFT LCD
* The typical period of time after which the lamp’s power output will have decreased by about half, given that the AQUOS is used continuously
in a 25°C room under standard lighting and brightness conditions.
5
LC-20B5M
OPERATION MANUAL
MAIN POWERMENUVOL ( )/( )
TV/VIDEOCH ( )/( )
LC-20B5M
Upper control panel
Part Names of Main Unit
Controls
NOTE
•TV/VIDEO,CH ( )/( ),VOL (–)/(+) and MENU 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.
HEADPHONE jack
Plug the headphone mini-plug into the Headphone jack
located on the front of the LCD TV set.
OPC sensor
Remote sensor OPC indicator (Optical Picture Control)
The Optical Picture Control indicator lights up green when the
“Backlight” is set to “Auto (OPC)”.
POWER indicator
POWER indicator lights up green when the power is on, and
red when in the standby mode (the indicator will not light
when the main power is off). The indicator lights up orange
when the wake-up timer is set.
* The examples used throughout this manual are based on
the LC-20B5M model.
To change the vertical angle of the LCD TV
set, tilt the screen up to 5 degrees forward or
10 degrees backward. The LCD TV set can
also be rotated up to 25 degrees to right and
left. Please adjust the angle so that the LCD
TV set can be watched most comfortably.
Card Lamp
When timer recording is set: Orange
When recording: Red
Standby: Green
PC Card Slot
Speaker
Tilt the display by grabbing onto
the carrying handle while securely
holding down the stand with your
other hand.
How to adjust the angle
Speaker
Terminals
S-VIDEO
AV-IN1 VIDEO
AUDIO (R)
AUDIO (L)
VIDEO
AUDIO (R)
AUDIO (L)
AV-IN2/OUT
Y
ANT. (Antenna terminal)
POWER INPUT (DC12V)
AUDIO (L)
AUDIO (R)
P
B
P
R
COMPONENT
Carrying handle
RearView
How to fix the cables
• Pull the cables connected to each terminal through the holes and close the left and right terminal covers.
Push the cables into the grooves of the support covers. Insert the cable holder (supplied) from above the
support cover and fix the cables.
Terminal cover
Cable holder
Terminal cover
Support cover
6
LC-20B5M
Part Names of Remote Control
Move the cursor to the upwards
(Select the menu items)
/
Still
(Pause the motion picture playback or card recording)
Move the cursor to the right
(Select the menu items)
/
Fast Forward
(Fast forwards the picture)
Move the cursor to the downwards
(Select the menu items)
/
Stop
(stop the motion picture playback or card recording)
OK
(Set the menu or items by selecting the cursor)
/
Play
(Playback the card)
Move the cursor to the left
(Select the menu items)
/
Fast Reverse
(Fast reverses the picture)
How to use the cursor during the
motion picture playback
SUBTITLE
Displays the Teletext
Subtitle directly.
HOLD
Temporarily holds the
current Teletext page.
REC
Records the motion
picture.
(Mute)
Switches the sound on and off.
Yellow,
Timer function Menu
Cyan, Status Display
Channel Select
MENU
Displays the TV menu or return
to normal screen.
VOL (+)/(
-
)
(Flashback)
Returns to the previous
channel.
Red, Picture Menu
END
Returns to normal screen
in Teletext mode.
RETURN
Return to the previous screen.
TEXT
Displays the Teletext mode
screen.
POWER
MPX
Switches the audio
mode.
REVEAL
Displays hidden information
such as solutions to riddles
and puzzles.
CARD
Switches the motion and
still picture.
SUBPAGE
Displays the Teletext
Subpage directly.
CAPTURE
Records the still picture.
TV/VIDEO
Switches the input source
between AV1, AV2, COMPONENT,
CARD and TV mode.
BACKLIGHT
Selects the brightness and
OPC of the display.
Green, Sound Menu
CH ( )/( )
Installing Batteries in the Remote Control
Before using the LCD TV set for the first time, install the two “AAA”size batteries supplied in the remote control. When the
batteries become depleted and the remote control fails to operate, replace the batteries with new “AAA”size batteries.
1
Open the battery cover.
2
Insert two “AAA”size batteries.
3
Close the battery cover.
■Place batteries with their
terminals corresponding to
the (+) and (–) indications in
the battery compartment.
Caution!
Precautions regarding batteries
■Improper use of batteries can result in a leakage of chemicals and/or explosion. Be sure to follow the instructions below.
•Place batteries with their terminals corresponding to the (+) and (–) indications.
•Different types of batteries have different characteristics. Do not mix batteries of different types.
•Do not mix old and new batteries. Mixing old and new batteries can shorten the life of new batteries and/or cause old
batteries to leak chemicals.
•Remove batteries as soon as they are depleted. Chemicals that leak from batteries can cause a rash. If chemical
leakage is found, wipe it off with a cloth.
•The batteries supplied with the LCD TV set may have a shorter operating time due to storage conditions.
•If the remote control is not to be used for an extended period of time, remove the batteries from the remote control.
Preparation
■Engaging the lower
claw with the remote
control, close the
cover.
■Slide the cover while
pressing the ( ) part.
+
–
+
–
7
LC-20B5M
DIMENSIONS
Unit: mm
6880
244
178
403.3
300.8
261
452 (including rubber foot)
673
384
212
39359
450 (including rubber foot)
47
100
100
8
LC-20B5M
REMOVING OF MAJOR PARTS
1. Remove the four lock screws from the stand, and detach the stand.
2. Remove the terminal covers (large and small).
3. Remove the three terminal screws.
4. Remove the fourteen lock screws from the cabinet B.
5. With the card eject button held down, open the cabinet in order of
5-1
thru
5-6
, and detach the cabinet B by
sliding it toward the PC card slot.
6. Remove the four lock screws from the stand angle, and detach the reinforcement angle.
7. Remove the wire holder and tape, and disconnect the connecting cable.
8. Disconnect all the connectors from all the PWBs.
Cabinet B
4
3
1
2
2
5
5-6
PC Card slot
Cabinet A
Terminal Cover (S)
Terminal Cover (L)
Stand
5-4
5-3
5-2 5-1
5-5
P4050
CN2
SC1202
P701
P2003
SC1201
SC3403
P6704
P6703
P6702
P6701
P6700
P6706
P3302
P3404
P3704
P3303
P4001
P3703
P3201
SC1204
SC2001
P5003
CN3
P2005
P9001
P1601
P2006
Operation PWB
Reinforcement Angle
Main PWB
R/C, LED PWBWire Holder Inverter PWB
Card LED PWB
Tape
6
8
8
8
88
8
8
8
8
8
7
7
Analog PWB
9
LC-20B5M
9. Remove the two lock screws from the operation panel (top cover), and detach the operation panel (top cover).
10. Remove the two lock screws from the operation PWB, and detach the operation PWB.
11. Remove the lock screw from the shield, and detach the shield from the main PWB.
12. Remove the two lock screws from the R/C, LED PWB, and detach the R/C, LED PWB.
13. Remove the two lock screws each from the speaker boxes (left and right), and detach both the speaker boxes.
Speaker Box (R)
R/C, LED PWB
Analog PWB
Speaker Box (L)
Inverter PWB
Shield Operation panel (Top Cover)
Operation
PWB
13
10
9
13
12
10
LC-20B5M
14. Remove the two lock screws from the inverter PWB, and detach the inverter PWB.
15.Remove the five lock screws from the main PWB, and undo the claws a and b.Detach the main PWB by lifting the
area around the claws and pulling the PWB out.
16. Remove the one lock screw from the card frame cover over, and detach the card frame cover.
17.Remove the four lock screws from the analog PWB, and undo the claws c and d. Detach the chassis frame (right)
from the analog PWB by pulling out the terminals. In the same way, undo the claws e and f, and detach the
chassis frame (left) from the analog PWB by pulling out the terminals.
Note:When detaching the main PWB and analog PWB, be careful not to break the PWB-fixing claws.
18. Remove the one lock screw from the card LED PWB, and detach the card LED PWB.
Inverter PWB
Main PWB
Analog PWB
f
Chassis Frame (L)
Chassis Frame (R)
Card Frame Cover
Card LED PWB
15 15
17
18
14
16
e
a
bc
d
Indice
Altri manuali Sharp TV
Sharp
Sharp 28JF-73E Manuale utente
Sharp
Sharp 63CS-03SC Manuale utente
Sharp
Sharp LC-32CHF5111E W Manuale utente
Sharp
Sharp 70FW-53I Manuale utente
Sharp
Sharp DV-3750S Manuale utente
Sharp
Sharp LD-26SH3U Manuale utente
Sharp
Sharp 29E-S1A Manuale utente
Sharp
Sharp LC-32N4000U Manuale utente
Sharp
Sharp CX68NF5 Manuale utente
Sharp
Sharp 81GF-63E Manuale utente
Sharp
Sharp 29LF-92E Manuale utente
Sharp
Sharp 27L-S500 Manuale utente
Sharp
Sharp 25R-M100 Manuale utente
Sharp
Sharp CX51K3 Manuale utente
Sharp
Sharp 27L-S100 Manuale utente
Sharp
Sharp 14LT-45C Manuale utente
Sharp
Sharp 21V-FR95S Manuale utente
Sharp
Sharp LC-32SH130E Manuale
Sharp
Sharp 37DT-25S Manuale utente
Sharp
Sharp 21LF-90H Manuale utente
