DOWNLOAD Sharp LC-20SD4E Service Manual ↓ Size: 875.25 KB | Pages: 9 in PDF or view online for FREE

Model
LC-20SD4E
Pages
9
Size
875.25 KB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD / Part 1
File
lc-20sd4e.pdf
Date

Sharp LC-20SD4E Service Manual ▷ View online

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.
MODEL
LCD COLOR TELEVISION
CONTENTS
#########
SERVICING NOTICES ON CHECKING ..............................................................................
HOW TO ORDER PARTS ....................................................................................................
IMPORTANT .........................................................................................................................
HOTEL MODE FUNCTION ..................................................................................................
ABOUT LEAD FREE SOLDER (PbF) ..................................................................................
GENERAL SPECIFICATIONS ..............................................................................................
DISASSEMBLY INSTRUCTIONS ........................................................................................
SERVICE MODE LIST ..........................................................................................................
WHEN REPLACING EEPROM (MEMORY) IC ....................................................................
RE-WRITE FOR DIGITAL SOFT FIRMWARE .....................................................................
ELECTRICAL ADJUSTMENTS ............................................................................................
TROUBLESHOOTING GUIDE .............................................................................................
BLOCK DIAGRAM ................................................................................................................
PRINTED CIRCUIT BOARDS ..............................................................................................
SCHEMATIC DIAGRAMS ....................................................................................................
WAVEFORMS ......................................................................................................................
MECHANICAL EXPLODED VIEWS .....................................................................................
REPLACEMENT PARTS LIST .............................................................................................
Page
A1-1
A1-1
A1-1
A1-2
A1-3
A2-1~A2-4
B1-1~B2-2
C-1
C-2
C-3
D-1~D-4
E-1~E-7
F-1~F-8
G-1~G-8
H-1~H-40
I-1~I-3
J-1~J-3
K1-1~K2-10
LC-20SD4E
SERVICING NOTICES ON CHECKING
1. KEEP THE NOTICES
As for the places which need special attentions,
they are indicated with the labels or seals on the
cabinet, chassis and parts. Make sure to keep the
indications and notices in the operation manual.
3. USE THE DESIGNATED PARTS
2. AVOID AN ELECTRIC SHOCK
There is a high voltage part inside. Avoid an
electric shock while the electric current is
flowing.
The parts in this equipment have the specific
characters of incombustibility and withstand
voltage for safety. Therefore, the part which is
replaced should be used the part which has
the same character.
Especially as to the important parts for safety
which is indicated in the circuit diagram or the
table of parts as a        mark, the designated
parts must be used.
5. PUT PARTS AND WIRES IN THE
ORIGINAL POSITION AFTER
ASSEMBLING OR WIRING
There are parts which use the insulation
material such as a tube or tape for safety, or
which are assembled in the condition that
these do not contact with the printed board.
The inside wiring is designed not to get closer
to the pyrogenic parts and high voltage parts.
Therefore, put these parts in the original
positions.
PERFORM A SAFETY CHECK AFTER
SERVICING
6.
Confirm that the screws, parts and wiring which
were removed in order to service are put in the
original positions, or whether there are the
portions which are deteriorated around the
serviced places serviced or not. Check the
insulation between the antenna terminal or
external metal and the AC cord plug blades.
And be sure the safety of that.
(INSULATION CHECK PROCEDURE)
1.
2.
3.
4.
Unplug the plug from the AC outlet.
Remove the antenna terminal on TV and turn
on the TV.
Insulation resistance between the cord plug
terminals and the eternal exposure metal
[Note 2] should be more than 1M ohm by
using the 500V insulation resistance meter
[Note 1].
If the insulation resistance is less than 1M
ohm, the inspection repair should be
required.
[Note 1]
If you have not the 500V insulation
resistance meter, use a Tester.
[Note 2]
External exposure metal: Antenna terminal
Earphone jack
A1-1
4. BE CAREFUL WITH THE
    LCD PANEL
Avoid a shock to the panel while servicing.
Take enough care to deal with it.
When you exchange IC and Transistor with a heat sink, apply silicon grease (YG6260M) on the contact
section of the heat sink. Before applying new silicon grease, remove all the old silicon grease.
(Old grease may cause damage to the IC and Transistor).
IMPORTANT
Please include the following informations when you order parts. (Particularly the VERSION LETTER.)
1. MODEL NUMBER and VERSION LETTER
The MODEL NUMBER can be found on the back of each product and the VERSION LETTER can be
     found at the end of the SERIAL NUMBER.
2. PART NO. and DESCRIPTION
You can find it in your SERVICE MANUAL.
HOW  TO  ORDER  PARTS
HOTEL MODE FUNCTION
The following can be set by the Hotel mode function.
To set the Hotel mode, please follow the steps below.
1.
2.
3.
4.
5.
6.
7.
8.
To release the Hotel mode, please follow the steps below.
1.
2.
3.
4.
5.
6.
7.
8.
In power off mode, press and hold the ‘VOLUME +’ button on the front panel.
Simultaneously press and hold the ‘        ’ button on the front panel.
Hold both keys, press the POWER button on the front panel.
The password screen is displayed.
Press it in order of ‘0’, ‘2’ and ‘7’ key of a remote control unit.
Then press the ENTER button.
The Hotel mode setting menu will appear.
Using the LEFT/RIGHT on the remote control, set the Hotel Lock to on.
Turn off the power.
The Hotel Lock has now been set up.
In power off mode, press and hold the ‘VOLUME+’ button on the front panel.
Simultaneously press and hold the ‘       ’ button on the front panel.
Hold both keys, press the POWER button on the front panel.
The password screen is displayed.
Press it in order of ‘0’, ‘2’ and ‘7’ key of a remote control unit.
Then press the ENTER button.
The Hotel mode setting menu will appear.
Using the LEFT/RIGHT on the remote control, set the Hotel Lock to off.
Turn off the power.
The Hotel Lock has now been cleared.
A1-2
Hotel Mode
Password
---
Hotel Mode
Hotel mode
Off
Power on fixed
Maximum volume
Volume fixed
Volume fixe level
RC button
Panel button
Variable
50
Variable
22
Respond
Respond
Hotel Mode
Menu button
On Screen Display
Input mode start
Input mode fixed
Reset
Respond
Yes
1
Variable
FUNCTION
Hotel mode
Power on fixed
Maximum volume
Volume fixed
Volume fix level
RC button
Panel button
Menu button
ON/OFF setting for Hotel mode function.
Effective/invalid setting of POWER button on the set and remote cotrol.  (*Note 1)
Effective/invalid setting of volume fix level function. (*Note 2)
Setting of output volume value.
Effective/invalid setting of remote control key operation.  (*Note 3)
Effective/invalid setting of main key operation.   (*Note 4)
Effective/invalid setting of menu, DTV menu and GUIDE keys operation of set and remote control. (*Note 4)
Setting of the maximum volume value (1~50).
On Screen Display
Input mode start
Input mode fixed
Reset
Display/non-display setting of analog menu, CALL, CH, audio, backlight, and volume level. (*Note 5)
Setting of input source at power supply On.
During the power on, effective/invalid setting of tuning the channel and input change operation. (*Note 6)
Various settings of the Hotel mode function return initial State.
Setting item
Note 1)
Note 2)
Note 3)
Note 4)
Note 5)
Note 6)
When setting it to “Fixed", the Sleep timer setting is turned off.
When setting it to “Fixed", the VOL+/- key operation of a main/ remote control and the MUTE key operation of a
remote control become invalid.
When setting it to “Fixed", the remote control operation and the service mode function in Hotel mode are effective.
When setting it to “Fixed", the service mode function in Hotel mode are effective.
The Sleep timer setting is turned off when setting it to "No", and the audio change with AUDIO key is invalid.
The Input mode fixed setting becomes effective when the Input mode start setting except for " Normal" setting.
When the ‘Power on fixed‘ is set to ‘fixed’, press and hold the
‘VOLUME +’ button and  ‘       ’ button on the front panel simultaneously.
Hold both keys, press the POWER button on the front panel, the power
is turned off.
Then follow steps 1~8.
NOTE:
PCBs (manufactured) using lead free solder will have a PbF printing on the PCB.
(Please refer to figures.)
Caution:
Pb free solder has a higher melting point than standard solder;
Typically the melting point is 86
°
F~104
°
F(30
°
C~40
°
C) higher.
Please use a soldering iron with temperature control and adjust it to 650
°
±
 20
°
F (350
°
±
 10
°
C).
In case of using high temperature soldering iron, please be careful not to heat too long.
Pb free solder will tend to splash when heated too high (about 1100
°
F/ 600
°
C).
All products with the printed circuit board with PbF printing must be serviced with lead free solder.
When soldering or unsoldering, completely remove all of the solder from the pins or solder area,
and be sure to heat the soldering points with the lead free solder until it melts sufficiently.
Distinction of PbF PCB:
Recommendations
Recommended lead free solder composition is Sn-3.0Ag-0.5Cu.
ABOUT LEAD FREE SOLDER (PbF)

A1-3
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Sharp LC-20SD4E Service Manual ▷ Download

  • DOWNLOAD Sharp LC-20SD4E Service Manual ↓ Size: 875.25 KB | Pages: 9 in PDF or view online for FREE
  • Here you can View online or download the Service Manual for the Sharp LC-20SD4E in PDF for free, which will help you to disassemble, recover, fix and repair Sharp LC-20SD4E LCD. Information contained in Sharp LC-20SD4E Service Manual (repair manual) includes:
  • Disassembly, troubleshooting, maintenance, adjustment, installation and setup instructions.
  • Schematics, Circuit, Wiring and Block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Exploded View and Parts List.