Sharp LC-26GA4E Service Manual ▷ View online
LC-26GA4E
SERVICE MANUAL
LCD COLOR TELEVISION
MODEL
LC-26GA4E
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.
SHARP CORPORATION
CONTENTS
Page
»
LIST OF CHANGED PARTS ...........................................................................................................................2
»
IMPORTANT SERVICE SAFETY PRECAUTION ........................................................................................ 3
»
SPECIFICATIONS ........................................................................................................................................5
»
OPERATION MANUAL ................................................................................................................................ 6
»
DIMENSIONS ............................................................................................................................................11
»
REMOVING OF MAJOR PARTS ................................................................................................................12
»
DESCRIPTION OF SCHEMATIC DIAGRAM .............................................................................................17
»
SCHEMATIC DIAGRAM .............................................................................................................................18
»
PARTS LIST ...............................................................................................................................................20
»
PACKING OF THE SET .............................................................................................................................25
OUTLINE
This model is based on the LC-26GA3E and is equipped with a redesigned speaker. This Service Manual
covers the modifications alone. For the other points, refer to the LC-26GA3E Service Manual.
covers the modifications alone. For the other points, refer to the LC-26GA3E Service Manual.
S84Y9LC26GA4E
2
LC-26GA4E
LIST OF CHANGED PARTS
Ref.No.
Description
LC-26GA3E/K/F/I/R
LC-26GA4E/K/F/I/R
Note
PWB ASSEMBLIES
LCD CONTROL Unit
DUNTKC268FE86
DUNTKC268FE88
Some Parts changed
CPU Unit
DUNTKC427FE20
MAIN Unit
DUNTKC585FE01 (E)
DUNTKC585FE04 (E)
No parts changed
DUNTKC585FE02 (K)
DUNTKC585FE05 (K)
No parts changed
DUNTKC585FE03 (F)
DUNTKC585FE06 (F)
No parts changed
DUNTKC585FE30 (I)
DUNTKC585FE32 (I)
No parts changed
DUNTKC585FE31 (R)
DUNTKC585FE33 (R)
No parts changed
AV Unit
DUNTKC586DE01 (E/I/R)
DUNTKC586DE04 (E/I/R)
No parts changed
DUNTKC586DE02 (K)
DUNTKC586DE05 (K)
No parts changed
DUNTKC586DE03 (F)
DUNTKC586DE06 (F)
No parts changed
KEY Unit
DUNTKC587DE01 (E/I/R)
DUNTKC587DE04 (E/I/R)
No parts changed
DUNTKC587DE02 (K)
DUNTKC587DE05 (K)
No parts changed
DUNTKC587DE03 (F)
DUNTKC587DE06 (F)
No parts changed
R/C LED Unit
DUNTKC588DE01 (E/I/R)
DUNTKC588DE04 (E/I/R)
No parts changed
DUNTKC588DE02 (K)
DUNTKC588DE05 (K)
No parts changed
DUNTKC588DE03 (F)
DUNTKC588DE06 (F)
No parts changed
EXT-SP Unit
DUNTKC589DE01 (E/I/R)
DUNTKC589DE04 (E/I/R)
No parts changed
DUNTKC589DE02 (K)
DUNTKC589DE05 (K)
No parts changed
DUNTKC589DE03 (F)
DUNTKC589DE06 (F)
No parts changed
DVI Unit
DUNTKC595FE50
POWER Unit
RDENCA072WJZZ
INVERTER Unit
RUNTKA075WJZZ
INVERTER-GND Unit
RUNTKA076WJZZ
1-Bit Amplifier Unit
B2SX4102BT
LCD PANEL
26” LCD Panel Unit
RLCDTA034WJZZ
LCD CONTROL Unit
R2026
Metal Oxide
VRS-CY1JF223JY
Delete
R2029
Metal Oxide
VRS-CY1JF223JY
Add
CABINET AND MECHANICAL PARTS
Please refer to a Parts list.
PACKING PARTS AND ACCESSORIES
Please refer to a Parts list.
3
LC-26GA4E
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SAFETY NOTICE
Many electrical and mechanical parts in Liquid Crystal
c o l o r t e l ev i s i o n h a ve s p e c i a l s a fe t y - r e l a t e d
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
c o l o r t e l ev i s i o n h a ve s p e c i a l s a fe t y - r e l a t e d
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
”
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.
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, etc.
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 220~240 volt AC outlet.
»
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.
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 resistor.
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 rms (this corresponds to 0.5
mA rms 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, 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 rms (this corresponds to 0.5
mA rms AC.) or more is excessive and indicates a
potential shock hazard which must be corrected
before returning the monitor to the owner.
IMPORTANT SERVICE SAFETY PRECAUTION
Ë
Service work should be performed 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:
CAUTION: FOR CONTINUED PROTECTION
AGAINST A RISK OF FIRE REPLACE ONLY
WITH SAME TYPE FUSE.
F701 (3.15A, 250V), F702 (3.15A, 250V), F703 (2A,
250V), F705 (1A, DC450V), F706 (5A, 250V), F707
(5A, 250V)
AGAINST A RISK OF FIRE REPLACE ONLY
WITH SAME TYPE FUSE.
F701 (3.15A, 250V), F702 (3.15A, 250V), F703 (2A,
250V), F705 (1A, DC450V), F706 (5A, 250V), F707
(5A, 250V)
DVM
AC SCALE
50k ohm
10W
TO EXPOSED
METAL PARTS
METAL PARTS
CONNECT TO
KNOWN EARTH
GROUND
KNOWN EARTH
GROUND
0.15
TEST PROBE
4
LC-26GA4E
Precautions for using lead-free solder
1 Employing lead-free solder
"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:
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.
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.
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
