Read Sharp LC-28HM2E (serv.man2) Service Manual online
1
LC-28HM2
AN-28SP2
SERVICE MANUAL
SY0M5LC-28HM2
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.
to its original condition and only parts identical to those specified should be used.
MODEL
LC-28HM2
(E/H/M)
AN-28SP2
CONTENTS
Page
SHARP CORPORATION
LCD AV MONITOR
Side Speakers
(Option)
(Option)
»
IMPORTANT SERVICE SAFETY PRECAUTION ..... 2
»
SPECIFICATIONS ................................................ 3
»
OPERATION MANUAL ........................................ 4
»
DIMENSIONS ...................................................... 7
»
REMOVING OF MAJOR PARTS .......................... 9
»
POWER SUPPLY START-UP SEQUENCE ........ 15
»
ADJUSTMENT PROCEDURES ......................... 16
»
LIST OF ADJUSTMENT ITEMS ........................ 18
»
OPERATIONS IN PROCESS ADJUSTMENT .... 25
»
ADJUSTING PROCEDURE ............................... 27
»
HOW TO ADJUST DISPLAY UNIT
INDEPENDENTLY ............................................. 37
»
TROUBLE SHOOTING TABLE .......................... 40
»
CHASSIS LAYOUT ............................................. 49
»
DESCRIPTION OF MAJOR IC FUNCTIONS .... 51
Page
»
BLOCK DIAGRAM ............................................. 54
»
PRINTED WIRING BOARD BLOCK DIAGRAM .. 56
»
MULTI COLOR SYSTEM BLOCK DIAGRAM .... 58
»
OVERALL WIRING DIAGRAM ........................... 59
»
DESCRIPTION OF SCHEMATIC DIAGRAM ..... 62
»
WAVEFORMS .................................................... 63
»
SCHEMATIC DIAGRAM ..................................... 64
»
PRINTED WIRING BOARD ASSEMBLIES ...... 102
»
PARTS LIST
Ë
ELECTRICAL PARTS ................................. 115
Ë
CABINET AND MECHANICAL PARTS ....... 136
Ë
SUPPLIED ACCESSORIES ....................... 140
Ë
PACKING PARTS ........................................ 140
»
PACKING OF THE SET ................................... 141
»
OPTIONAL SYSTEMS ..................................... 142
2
LC-28HM2
AN-28SP2
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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 “
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
”
and shaded areas in the
Replacement Parts List 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.
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.
CAUTION: FOR CONTINUED PROTECTION
AGAINST A RISK OF FIRE REPLACE ONLY WITH
SAME TYPE FUSE. F1 (T1.6A, TR5-T), F1 (T2.5A,
250V, TR-5), F1 (T3.15A, TR5-T), F2 (T3.15A, TR5-
T), F3 (T2A, TR5-T), F4 (T2A, TR5-T), F6 (T1A, TR5-
T), F7 (T1A, TR5-T), F8 (P110A, 117C), F704 (2A,
250V), F705 (2A, 250V) FUSE.
AGAINST A RISK OF FIRE REPLACE ONLY WITH
SAME TYPE FUSE. F1 (T1.6A, TR5-T), F1 (T2.5A,
250V, TR-5), F1 (T3.15A, TR5-T), F2 (T3.15A, TR5-
T), F3 (T2A, TR5-T), F4 (T2A, TR5-T), F6 (T1A, TR5-
T), F7 (T1A, TR5-T), F8 (P110A, 117C), F704 (2A,
250V), F705 (2A, 250V) FUSE.
WARNING
1. For continued safety, no modification of any circuit
should be attempted.
2. Disconnect AC power before servicing.
BEFORE RETURNING THE RECEIVER
(Fire & Shock Hazard)
(Fire & Shock Hazard)
Before returning the receiver to the user, perform
the following safety checks:
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.
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.
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).
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 1.5k 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.
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.
»
Use an AC voltmeter having with 5000 ohm per volt,
or higher, sensitivity or measure the AC voltage drop
across the resisor.
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 35V peak (this corresponds to 0.7
milliamp. peak AC.) or more is excessive and
indicates a potential shock hazard which must be
corrected before returning the monitor to the owner.
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 35V peak (this corresponds to 0.7
milliamp. peak AC.) or more is excessive and
indicates a potential shock hazard which must be
corrected before returning the monitor to the owner.
TO EXPOSED
METAL PARTS
METAL PARTS
CONNECT TO
KNOWN EARTH
GROUND
KNOWN EARTH
GROUND
IMPORTANT SERVICE SAFETY PRECAUTION
Ë
Service work should be perfomed only by qualified service technicians who are thor-
oughly familiar with all safety checks and the servicing guidelines which follow:
oughly familiar with all safety checks and the servicing guidelines which follow:
DVM
AC SCALE
50k ohms.
10W
0.15
µ
F
TEST PROBE
3
LC-28HM2
AN-28SP2
Specifications
LCD
Size (Diagonal)
28" WIDE XGA LCD
Number of pixel
2,949,120 (1280 dots
×
3 RGB
×
768 lines)
Low reflection
Low reflection coating
Brightness
400cd/m
2
(at normally white)
Viewable angle
Left to right
160
°
Up to down
150
°
Life of backlight
60,000 hours (at normal mode)
VIDEO
Multi system capability
PAL/PAL-M/NTSC(N358/N443)/SECAM
Digital comb filter for PAL/SECAM
Yes
3D Y/C separator for NTSC
Yes
Wide-band chroma IC
Yes
Gamma correction circuit
Yes
Line scanning for PAL/SECAM
Yes
AUDIO
Separate speaker system
–
Recommendable optional speaker
Bose System side speakers; 25W (12.5W+12.5W)
INTERFACES
Display:
Display input
26 pins System link
(TERMINALS)
Speaker terminals
For BOSE System side speaker
Power
Inlet for AC power cord
AVC system:
Display output
26 pins System link
AV input1
S-video, Video, Audio; R/L
AV input2
S-video, Video, Audio; R/L
AV input3/AV OUTPUT
Video, Audio: R/L
COMPONENT1
Audio; R/L, Video; Y, P
B
(C
B
), P
R
(C
R
)
COMPONENT2
Audio; R/L, Video; Y, P
B
(C
B
), P
R
(C
R
)
PC
RGB input, Audio input, RS-232C control
Headphones jack
3.5mm diameter mini-jack
Power
Inlet for AC power cord
FUNCTIONS
OSD Language
English
Reverse/Invert
Mirror image only
Brightness
Medium/Bright/Dark
HD capability
1080i/720P for Component input
PC capability
VGA/SVGA/XGA
WIDE view mode
STRETCH/FULL
AUTO wide view (NTSC picture only)
Automatically fully stretched
POWER SUPPLY AC auto power voltage capability
AC 110V-240V, 50/60Hz
Power consumption
AVC system; AC 32W Display; AC 140W
APPEARANCE
Exterior colour
Silver
Outside dimensions (W)
×
(H)
×
(D)
AVC system; 360mm
×
65mm
×
365mm
Display with stand; 690.8mm
×
519mm
×
277mm
Display without stand; 690.8mm
×
448mm
×
59.7mm
Net weight
Display; 13.3 kg AVC system; 3.5 kg
ACCESSORIES
Remote control
Infrared wireless type
Batteries for R/C
Size AA
AC power cord
2pcs (for Display and AVC System)
System cable
26 pins plug (male to male), 4m
Cable clamp
4 pcs
AVC system terminal cover
1 pc
AV 21-pin adapter
European 21-pin type to RCA pin type (For Europe only)
AV cable
RCA pin type (For Europe only)
Operation manual
1 pc
×
2
Ë
Design and specifications are subject to change without notice.
4
LC-28HM2
AN-28SP2
Operation Manual
Display
–
+
BRIGHTNESS
INPUT
VOL
MAIN POWER
VOL (+)/(–) button
INPUT button
MAIN POWER switch
BRIGHTNESS button
Remote sensor window
Side speakers
(Option)
(Option)
POWER/Standby indicator
Table stand
Display input terminal
Speaker cable
connection terminals
for the optional
side speakers
connection terminals
for the optional
side speakers
AC power input
terminal
terminal
Back cover
System cable
cover
cover
Top view
Front view
Rear view
