Read Sharp LC-42LE771K Service Manual online
1
LC-42/50LE772
LC-42/50LE771
SERVICE MANUAL
LED LCD
COLOUR TELEVISION
160mm
125mm
100mm
80mm
63mm
50mm
40mm
31.5mm
25mm
20mm
A-data-1
sharp.
Corporate Trademark
In the interests of user safety (required by safety regulations in some countries) the set should
be restored to its original condition and only identical parts to those specified should be used.
CONTENTS
SAFETY PRECAUTION
IMPORTANT SERVICE SAFETY
PRECAUTIONS
................................................. 3
Precautions for using lead-free solder................ 4
End of life disposal............................................. 5
OUTLINE
MAJOR SERVICE PARTS ................................ 6
CHAPTER 1. SPECIFICATIONS
[1] SPECIFICATIONS ........................................ 7
CHAPTER 2. OPERATION MANUAL
[1] OPERATION MANUAL
................................ 8
CHAPTER 3. DIMENSIONS
[1] DIMENSIONS 42 ........................................ 13
[2] DIMENSIONS 50 ........................................ 14
CHAPTER 4. REMOVING OF MAJOR PARTS
[1] CAUTION REMOVE REAR CABINET ....... 15
CHAPTER 5. ADJUSTMENT
[1] SERVICE MENU SETTINGS.................... 18
[2] SOFTWARE UPDATE ............................. 23
CHAPTER 6. TROUBLESHOOTING
[1] TROUBLESHOOTING .............................. 24
CHAPTER 7. MAJOR IC INFORMATIONS
[1] INTRODUCTION ...................................... 34
[2] MAJOR IC INFORMATIONS..................... 35
CHAPTER 8. OVERALL WIRING/SYSTEM BLOCK
[1] OVERALL WIRING DIAGRAM 42”........... 77
[2] OVERALL WIRING DIAGRAM 50”........... 78
[3] SYSTEM BLOCK DIAGRAM ................... 79
CHAPTER 9. PRINTED WIRING BOARD
[1] MAIN BOARD........................................... 80
[2] POWER BOARD...................................... 81
CHAPTER 10. SCHEMATIC DIAGRAMS
[1] Schematic Diagrams................................ 83
PARTS GUIDE
.
Issued: 22
th
Sep 2014
SE00LC42LE771
LC-42LE771EN/K
LC-50LE771EN/K
LC-42LE772EN
MODELS
LC-50LE772EN
SHARP CORPORATION
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LC-42/50LE772
LC-42/50LE771
Comparison LC**LE76*E AND LC**LE77*EN
LC**LE760E
LC**LE771EN
Ma
in
Main board
17MB90-3
SoC
Maker
MSTAR
Part number
MSD8WB9BXA-UTY
Software
LC-**LE76* E_SW Version_V3.3.8e
LC-**LE77* E_SW Version_V3.3.8e
LE76x: Silver painting frame
LE77x: Fume titanium hotstamp frame
RC4848
RC5117 & RC1500
28/07/2014
Made by: M. Ceacero
Rear Cabinet changes
from silver to fume
titanium
from silver to fume
titanium
Remote Control & Air
mouse
mouse
Stand and neck
change from silver to
fume titanium
change from silver to
fume titanium
DIFFERENCE BETWEEN MODELS
LC-42_50LE77xx series is based on LC-42_5076xx series.
The main differences are basically cosmetic changes and are described
below:
The main differences are basically cosmetic changes and are described
below:
● Frame rear cabinet is finished as fume titanium hot stamp
● Stand and neck change from silver to fume titanium colour
● Remote control change from RC4848 to RC5117
● New remote control RC1500. Air mouse pointer works only on the portal.
● This series includes Netflix in all models
● New Software
● Stand and neck change from silver to fume titanium colour
● Remote control change from RC4848 to RC5117
● New remote control RC1500. Air mouse pointer works only on the portal.
● This series includes Netflix in all models
● New Software
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LC-42/50LE772
LC-42/50LE771
LC-20B5E
TO EXPOSED
METAL PARTS
CONNECT TO
KNOWN EARTH
GROUND
DVM
AC SCALE
1.5k ohm
10W
0.15 µF
TEST PROBE
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
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 “ “.
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
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.
Service work should be performed only by qualified service technicians who are thoroughly familiar with all
safety checks and the servicing guidelines which follow:
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)
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 220~240 volt AC outlet. (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.
•A true RMS reading multimeter should be used for this test, especially where the equipment uses a switch mode
power supply which may result in very non-sinusoidal leakage current.
•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 1.05V peak (this corresponds to 0.7 mA. peak AC.) or more is excessive and indicates a potential shock
hazard which must be corrected before returning the monitor to the owner.
!
CAUTION
: FOR CONTINUED PROTECTION AGAINST A RISK OF
FIRE REPLACE ONLY WITH SAME TYPE
42” FS1, FS2 (T 3.15A L250V)
50” FS100, FS101 (T 3.15A L250V)
42” FS1, FS2 (T 3.15A L250V)
50” FS100, FS101 (T 3.15A L250V)
SAFETY PRECAUTION
IMPORTANT SERVICE SAFETY PRECAUTION
4
LC-42/50LE772
LC-42/50LE771
PRECAUTIONS FOR USING LEAD-FREE SOLDER
1 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
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.
2 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.
Lead-free wire solder for servicing.