Sharp LC-26GD7E (serv.man2) Service Manual ▷ View online
SERVICE MANUAL
LCD COLOUR
TELEVISION (Display)
MODEL
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
CONTENTS
CORPORATION
NOTE ON ELECTROSTATICAL SHIELDING .....................................................................................................2
SAFETY WARNINGS / REGULATIONS .............................................................................................................2
PRECAUTIONS FOR USING LEAD-FREE SOLDER .........................................................................................3
REAR PANEL REMOVAL ....................................................................................................................................4
WIRING DIAGRAM L2650 ..................................................................................................................................6
ENTER SERVICE MODE ....................................................................................................................................8
OPTION BYTES TABLE WITH SERVICE RELEVANT OPTION BITS .............................................................15
SERVICE MENU L2650 (LCD) ..........................................................................................................................21
SOFTWARE LOADING .....................................................................................................................................22
COMPONENTS CHART ...................................................................................................................................24
TECHNICAL SPECIFICATIONS ........................................................................................................................25
TROUBLESHOOTING FOR LCD-CONTROLLER AND MICOM-BOARD ........................................................26
APPENDIX ........................................................................................................................................................29
SPARE PARTS LIST .........................................................................................................................................63
SAFETY WARNINGS / REGULATIONS .............................................................................................................2
PRECAUTIONS FOR USING LEAD-FREE SOLDER .........................................................................................3
REAR PANEL REMOVAL ....................................................................................................................................4
WIRING DIAGRAM L2650 ..................................................................................................................................6
ENTER SERVICE MODE ....................................................................................................................................8
OPTION BYTES TABLE WITH SERVICE RELEVANT OPTION BITS .............................................................15
SERVICE MENU L2650 (LCD) ..........................................................................................................................21
SOFTWARE LOADING .....................................................................................................................................22
COMPONENTS CHART ...................................................................................................................................24
TECHNICAL SPECIFICATIONS ........................................................................................................................25
TROUBLESHOOTING FOR LCD-CONTROLLER AND MICOM-BOARD ........................................................26
APPENDIX ........................................................................................................................................................29
SPARE PARTS LIST .........................................................................................................................................63
230-90433926
LC26GD7E
LC26GD7E
2
Note on electrostatic shielding
1. Electrostatically shielded MOS workstations
Components sensitive to electrostatic discharge
must be handled at workstation with electrostatic
shielding. An electrostatically shielded MOS work-
station is fi tted with discharge resistor which earth
all conductive materials, including the technician
working there. Dielectrics are discharged by air
ionisation. The use of soldering irons and meas-
uring equipment at shielded workstation is only
possible in conjunction with isolating transformer
in each of the devices used. Measuring equip-
ment chassis are also earthed with discharge re-
sistors.
must be handled at workstation with electrostatic
shielding. An electrostatically shielded MOS work-
station is fi tted with discharge resistor which earth
all conductive materials, including the technician
working there. Dielectrics are discharged by air
ionisation. The use of soldering irons and meas-
uring equipment at shielded workstation is only
possible in conjunction with isolating transformer
in each of the devices used. Measuring equip-
ment chassis are also earthed with discharge re-
sistors.
2. Shielded packaging using conductive
materials
materials
To protect against electrostatic charges, electri-
cally conductive plastics are used for packaging
and transport purposes. Conductive plastics are
available in the form of transparent protective
bags, foam plastic, fi lm sheeting or containers.
Sensitive components requiring the use of pro-
tective packaging must only be packed and un-
packed at shielded workstations.
cally conductive plastics are used for packaging
and transport purposes. Conductive plastics are
available in the form of transparent protective
bags, foam plastic, fi lm sheeting or containers.
Sensitive components requiring the use of pro-
tective packaging must only be packed and un-
packed at shielded workstations.
Safety warnings/regulations
1. The repair, modifi cation and testing of mains-op-
erated electronic devices and their accessories
must only be performed by qualifi ed persons.
must only be performed by qualifi ed persons.
2. It is necessary to follow the regulations and safety
warnings to VDE 0701, part 200, as well as the
regulations and safety warnings applicable in the
country concerned.
regulations and safety warnings applicable in the
country concerned.
3. VDE 0701, Part 2, contains regulations on the re-
pair, modifi cation and testing of mains-operated
electronic devices and their accessories.
electronic devices and their accessories.
4. Before delivery, the device and the connecting
leads (including any protective earth conductor
fi tted) must undergo visual inspection, and the
insulation resistance and the equivalent leak-
age current must be measured according to VDE
0701, part 200. The low-resistance continuity of
the protective earth conductor must be verifi ed by
measurement to VDE regulation 0701, part 1.
fi tted) must undergo visual inspection, and the
insulation resistance and the equivalent leak-
age current must be measured according to VDE
0701, part 200. The low-resistance continuity of
the protective earth conductor must be verifi ed by
measurement to VDE regulation 0701, part 1.
5. The regulations of the country concerned must
also be observed.
6. Only genuine parts must be used for replacing
components marked with the symbol
.
3
Precautions for using lead-free solder
1. Employing lead-free solder
„LCD CONT PWB“,“TMDS RX PWB“,“KEY PWB“,“R/C LED PWB“,“MOTOR PWB“,“INV PWB“,“POWER
PWB“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:
PWB“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:
Indicates lead-free solder of tin, silver and copper.
2. Using lead-free wire solder
When fi xing the PWB soldered with the lead-free solder, apply lead-free wire solder. Repairing with conven-
tional 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 40ºC, we recom-
mend you to use a dedicated soldering bit, if you are not familiar with how to obtain lead-free wire solder or
sodening bit, contact our service station or service ranch in your area.
tional 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 40ºC, we recom-
mend you to use a dedicated soldering bit, if you are not familiar with how to obtain lead-free wire solder or
sodening bit, contact our service station or service ranch 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 wettabillty, 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 excoeded, remove the bit from the PWB as soon as you conurm 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, fi le it with steel wool or fi ne sandpaper.
lead solder by 40°C, and as it has poor solder wettabillty, 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 excoeded, remove the bit from the PWB as soon as you conurm 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, fi le it with steel wool or fi ne sandpaper.
Lead-free wire solder for servicing
Be careful when replacing parts with polarity indication on the PWB silk.
L
F a
Pb
Part No.
Ë
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
4
Rear panel removal
1. Place the set on a clean and soft base.
2. Open the screws (fi g. 1 and 2).
3. Mount stand for serviceposition.
Fig. 1
Fig. 2