Sharp LC-20AD5E Service Manual ▷ View online
B2-1
Masking Tape
(Cotton Tape)
(Cotton Tape)
DISASSEMBLY INSTRUCTIONS
2.
REMOVAL
IC
Put Masking Tape (cotton tape) around the Flat Package
IC to protect other parts from any damage.
(Refer to Fig. 2-1.)
IC to protect other parts from any damage.
(Refer to Fig. 2-1.)
1.
Fig. 2-1
NOTE
REMOVAL AND INSTALLATION OF
FLAT PACKAGE IC
FLAT PACKAGE IC
Some ICs on the PCB are affixed with glue, so be
careful not to break or damage the foil of each IC
leads or solder lands under the IC when removing it.
careful not to break or damage the foil of each IC
leads or solder lands under the IC when removing it.
NOTE
Masking is carried out on all the parts located within
10 mm distance from IC leads.
10 mm distance from IC leads.
Blower type IC
desoldering machine
desoldering machine
IC
Heat the IC leads using a blower type IC desoldering
machine. (Refer to Fig. 2-2.)
machine. (Refer to Fig. 2-2.)
2.
Fig. 2-2
NOTE
Do not rotate or move the IC back and forth , until IC
can move back and forth easily after desoldering the
leads completely.
can move back and forth easily after desoldering the
leads completely.
When IC starts moving back and forth easily after
desoldering completely, pickup the corner of the IC using
tweezers and remove the IC by moving with the IC
desoldering machine. (Refer to Fig. 2-3.)
desoldering completely, pickup the corner of the IC using
tweezers and remove the IC by moving with the IC
desoldering machine. (Refer to Fig. 2-3.)
3.
Blower type IC
desoldering
machine
desoldering
machine
IC
Fig. 2-3
Tweezers
Peel off the Masking Tape.
4.
Absorb the solder left on the pattern using the Braided
Shield Wire. (Refer to Fig. 2-4.)
Shield Wire. (Refer to Fig. 2-4.)
5.
NOTE
Do not move the Braided Shield Wire in the vertical
direction towards the IC pattern.
direction towards the IC pattern.
Braided Shield Wire
Soldering Iron
Fig. 2-4
IC pattern
B2-2
DISASSEMBLY INSTRUCTIONS
Supply soldering
from upper position
to lower position
from upper position
to lower position
IC
Supply the solder from the upper position of IC leads
sliding to the lower position of the IC leads.
(Refer to Fig. 2-6.)
sliding to the lower position of the IC leads.
(Refer to Fig. 2-6.)
2.
Fig. 2-6
Soldering Iron
Solder
IC
Absorb the solder left on the lead using the Braided
Shield Wire. (Refer to Fig. 2-7.)
Shield Wire. (Refer to Fig. 2-7.)
3.
Fig. 2-7
Soldering Iron
Braided Shield Wire
NOTE
Do not absorb the solder to excess.
IC
When bridge-soldering between terminals and/or the
soldering amount are not enough, resolder using a Thin-
tip Soldering Iron. (Refer to Fig. 2-8.)
soldering amount are not enough, resolder using a Thin-
tip Soldering Iron. (Refer to Fig. 2-8.)
4.
Fig. 2-8
Thin-tip Soldering Iron
NOTE
When the IC leads are bent during soldering and/or
repairing, do not repair the bending of leads. If the
bending of leads are repaired, the pattern may be
damaged. So, always be sure to replace the IC in this
case.
repairing, do not repair the bending of leads. If the
bending of leads are repaired, the pattern may be
damaged. So, always be sure to replace the IC in this
case.
Finally, confirm the soldering status on four sides of the
IC using a magnifying glass.
Confirm that no abnormality is found on the soldering
position and installation position of the parts around the
IC. If some abnormality is found, correct by resoldering.
IC using a magnifying glass.
Confirm that no abnormality is found on the soldering
position and installation position of the parts around the
IC. If some abnormality is found, correct by resoldering.
5.
Solder temporarily
Soldering Iron
INSTALLATION
Take care of the polarity of new IC and then install the
new IC fitting on the printed circuit pattern. Then solder
each lead on the diagonal positions of IC temporarily.
(Refer to Fig. 2-5.)
new IC fitting on the printed circuit pattern. Then solder
each lead on the diagonal positions of IC temporarily.
(Refer to Fig. 2-5.)
1.
Fig. 2-5
Solder temporarily
C-1
SERVICE MODE LIST
This unit is provided with the following SERVICE MODES so you can repair, examine and adjust easily.
To enter to the SERVICE MODE function, press and hold both buttons simultaneously on the main unit and on the remote
control for more than the standard time in the appropriate condition. (See below chart.)
control for more than the standard time in the appropriate condition. (See below chart.)
Initialization of factory TV data.
NOTE: If you set factory initialization, the memories are reset such
NOTE: If you set factory initialization, the memories are reset such
as the channel setting, and the POWER ON total hours.
Set Key
Operations
Remocon
Key
VOL. DOWN
(Minimum)
1
2 sec.
Standard
Time
Set
Condition
POWER ON
POWER ON total hours are displayed on the screen.
Can be checked of the INITIAL DATA of MEMORY IC.
Refer to the "WHEN REPLACING EEPROM (MEMORY) IC".
Can be checked of the INITIAL DATA of MEMORY IC.
Refer to the "WHEN REPLACING EEPROM (MEMORY) IC".
VOL. DOWN
(Minimum)
6
2 sec.
VOL. DOWN
(Minimum)
9
2 sec.
POWER ON
POWER ON
Display of the Adjustment MENU on the screen.
Refer to the "ELECTRICAL ADJUSTMENT" (On-Screen Display
Adjustment).
Refer to the "ELECTRICAL ADJUSTMENT" (On-Screen Display
Adjustment).
VOL. DOWN
(Minimum)
2 sec.
POWER ON
2
Check of the SUM DATA, POWER ON total hours, MICON
VERSION and DIGITAL TV MICON FIRMWARE on the screen.
Refer to the "WHEN REPLACING EEPROM (MEMORY) IC".
VERSION and DIGITAL TV MICON FIRMWARE on the screen.
Refer to the "WHEN REPLACING EEPROM (MEMORY) IC".
C-2
Initial total of MEMORY IC, MICON VERSION, Digital TV MICON Firmware and POWER ON TOTAL HOURS can be
checked on the screen. Total hours are displayed in 16 system of notation.
checked on the screen. Total hours are displayed in 16 system of notation.
NOTE:
Initial setting data check sum.
AD CONVERTER data check sum.
WHEN REPLACING EEPROM (MEMORY) IC
If you set a factory initialization, the total hours is reset to "0".
Please refer to "CONFIRMATION OF INITIAL DATA" when SUM DATA is not corresponding.
Please refer to "CONFIRMATION OF INITIAL DATA" when SUM DATA is not corresponding.
FIG. 2
1.
2.
3.
4.
2.
3.
4.
Turn on the POWER, and set to the TV mode.
Set the VOLUME to minimum.
Press both VOL. DOWN button on the set and Channel button (2) on the remote control for more than 2 seconds.
After the confirmation of MICON VERSION and Digital TV MICON Firmware, turn off the power.
ADDRESS and DATA should appear as FIG 1.
Set the VOLUME to minimum.
Press both VOL. DOWN button on the set and Channel button (2) on the remote control for more than 2 seconds.
After the confirmation of MICON VERSION and Digital TV MICON Firmware, turn off the power.
ADDRESS and DATA should appear as FIG 1.
INIT: 2E
D0
VCT-P:
3451
LCD ON: 0000
Firmware Version
FIG. 1
Hardware v
ersion
Software version
A.0
CB00C74021
CB00C74021
Version
OK
END
ANALOG M: DB060-70328A
ANALOG S: DB050-70330A
ANALOG S: DB050-70330A
ADDRESS
DATA
INIT 0000 00
LDC ON 0000
ANALOG M: DB060-70328
ANALOG S: DB050-70330
LDC ON 0000
ANALOG M: DB060-70328
ANALOG S: DB050-70330
Turn on the POWER, and set to the TV mode.
Set the VOLUME to minimum.
Press both VOL. DOWN button on the set and Channel button (6) on the remote control for more than 2 seconds.
ADDRESS and DATA should appear as FIG 2.
Set the VOLUME to minimum.
Press both VOL. DOWN button on the set and Channel button (6) on the remote control for more than 2 seconds.
ADDRESS and DATA should appear as FIG 2.
NOTE: The each item value might be
different according to each set.
4.
5.
6.
7.
8.
9.
6.
7.
8.
9.
10.
11.
12.
The unit will now have the correct DATA for the new MEMORY IC.
11.
12.
The unit will now have the correct DATA for the new MEMORY IC.
ADDRESS is now selected and should "blink". Using the UP/DOWN buton on the remote, step through the ADDRESS
until required ADDRESS to be changed is reached.
Press RIGHT/LEFT button to select DATA. When DATA is selected, it will "blink".
Again, step through the DATA using UP/DOWN button until required DATA value has been selected.
Pressing RIGHT/LEFT button will take you back to ADDRESS for further selection if necessary.
Repeat steps 4 to 6 until all data has been checked.
When satisfied correct DATA has been entered, turn POWER off (return to STANDBY MODE) to finish DATA input.
until required ADDRESS to be changed is reached.
Press RIGHT/LEFT button to select DATA. When DATA is selected, it will "blink".
Again, step through the DATA using UP/DOWN button until required DATA value has been selected.
Pressing RIGHT/LEFT button will take you back to ADDRESS for further selection if necessary.
Repeat steps 4 to 6 until all data has been checked.
When satisfied correct DATA has been entered, turn POWER off (return to STANDBY MODE) to finish DATA input.
After the data input, set to the initializing of shipping.
Turn POWER on.
Press both VOL. DOWN button on the set and Channel button (1) on the remote control for more than 2 seconds.
After the finishing of the initializing of shipping, the unit will turn off automatically.
Turn POWER on.
Press both VOL. DOWN button on the set and Channel button (1) on the remote control for more than 2 seconds.
After the finishing of the initializing of shipping, the unit will turn off automatically.
If a service repair is undertaken where it has been required to change the MEMORY IC, the following steps should be taken to
ensure correct data settings while making reference to INITIAL SETTING TABLE (Attached "INITIAL DATA").
ensure correct data settings while making reference to INITIAL SETTING TABLE (Attached "INITIAL DATA").
1.
2.
3.
2.
3.
CONFIRMATION OF INITIAL DATA
CONFIRMATION OF CHECK SUM, MICON VERSION AND DIGITAL TV MICON FIRMWARE
AND POWER ON TOTAL HOURS
AND POWER ON TOTAL HOURS
POWER ON total hours.
= (16 x 16 x 16 x thousands digit value)
+ (16 x 16 x hundreds digit value)
+ (16 x tens digit value)
+ (ones digit value)
+ (16 x 16 x hundreds digit value)
+ (16 x tens digit value)
+ (ones digit value)
Main Micon Fimware Version
Sub Micon Fimware Version
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