Sharp LC-20C2EA (serv.man2) Service Manual ▷ View online
7
LC-20C2EA
REMOVING OF MAJOR PARTS
1. Remove 4 screws
1
from the Stand.
2. Detach the Terminal Covers
2
.
3. Remove 6 screws
3
from the Cabinet B.
4. Remove 2 screws
4
.
5. Cabinet A is opened in order of 5-1 ~ 5-9 ,
and Cabinet B is removed.
6. Remove 4 screws
6
and detach the Stand Fixing Angle.
7. Disconnect the connectors
7
from the PWBs.
3
3
1
Stand
Cabinet B
Cabinet A
2
Terminal Cover
2
Terminal Cover
5-4
5-5
5-6
5-3
5-2
5-1
5-7
5-8
5-9
4
7
7
7
7
6
7
7
7
7
7
7
7
7
Switch PWB
Inverter-B
PWB
PWB
Reinforcement angle
Inverter-A
PWB
PWB
Tuner PWB
Main PWB
LC-20C2EA
8
8. Remove 2 screws
8
from the Inverter-A PWB.
9. Remove 4 screws
9
from the Tuner PWB.
10. Remove 4 screws
0
from the Main PWB.
11. Remove 1 screw
q
from the Inverter-B PWB.
12. Remove 2 screws
w
from the Switch PWB.
10
9
8
11
Inverter-A
PWB
PWB
Main PWB
Chassis Frame-A
Chassis Frame-B
Tuner
PWB
PWB
Inverter-B
PWB
PWB
10
9
Switch PWB
12
9
9
LC-20C2EA
»
Precautions in handling the LCD panels
1. Work in a clean room (with humidities below 50%).
2. Be sure to wear an anti-static armband.
3. Handle the panels on an electroconductive mat.
4. Be careful not to fall, shake and shock the panels.
5. Use an ionizer (within 30 cm).
2. Be sure to wear an anti-static armband.
3. Handle the panels on an electroconductive mat.
4. Be careful not to fall, shake and shock the panels.
5. Use an ionizer (within 30 cm).
13. Remove 4 screws
e
from the LCD Display Unit and detach
the Shielding Plate.
14. Remove Reflection Plate
r
.
15. Remove the Lamp Sets
t
.
16. Detach the D-BEFM Sheet, Prism Sheet, Reflection Sheet,
ITO Sheet and Diffusion Plate Cover (
y
).
17. Remove 6 Lamp Holder Fixing Screws
u
.
Lamp Holder
Lamp Holder
LCD Display Unit
Prism Sheet
D-BEFM Sheet
ITO Sheet
Reflection Sheet
17
16
Diffusion Plate Cover
LCD Display Unit
(Front)
(Front)
13
13
17
Shielding Plate
Reflection Plate
Lamp Set-A
Lamp Set-B
14
15
LC-20C2EA
10
ADJUSTING PROCEDURE OF EACH SECTION
The best adjustment is made before shipping. If any position deviation is found or after part replace is performed,
adjust as follows.
adjust as follows.
Preparation for adjustments
Use the dedicated AC adapter or stable DC power supply.
LC20C2 AC adapter: UADP-0241CEPZ
DC power supply: 13V 5.4A
LC20C2 AC adapter: UADP-0241CEPZ
DC power supply: 13V 5.4A
1. Adjusting procedure
• Checker adjustment
Power ON (Adjustment processing mode)
→
Counter bias adjustment
→
TAMP (Contrast) adjustment
→
White balance adjustment
2. Entering the adjustment processing mode
There are the following two methods.
• Setting the pin (81)(KEY4) or pin (82)(KEY5) of IC2001 (microprocessor) to GND, turn on the power.
• A “POWER” key is made on with pushing an “TV/VIDEO” and “MENU” keys at the same time.(K of the inspection
• Setting the pin (81)(KEY4) or pin (82)(KEY5) of IC2001 (microprocessor) to GND, turn on the power.
• A “POWER” key is made on with pushing an “TV/VIDEO” and “MENU” keys at the same time.(K of the inspection
process mode is displayed by the upper left of the image plane.)
→
Next, “CH (
Ù
)” and “VOL (–)” keys are pushed
at the same time.(It becomes the image plane of the adjustment process mode.).....When it is canceled, it is made
to turn it off.(Even off in the “MAIN POWER” key, off with R/C are good.)
to turn it off.(Even off in the “MAIN POWER” key, off with R/C are good.)
3. Key operation in the adjustment process mode
• The receiving channel UP/DOWN is performed with the “CH (
ù
)/(
Ù
)” keys.
One push ... The UP/DOWN tuning is performed per channel.
Continuous push ... The UP/DOWN search is performed until a next receivable station is found.
Continuous push ... The UP/DOWN search is performed until a next receivable station is found.
• Various adjustments
The adjustment is performed for each item by the “MENU”, “Menu cursor”, “CH (
ù
)/(
Ù
)” or “VOL (+)/(–)” keys
(LCD TV set and remote control).
• Adjustment item is chosen with the Menu cursor upward/downward keys.
• The adjustment item makes a toggle operation with the “MENU” key input. (Next item)
• The adjustment item makes a toggle operation with the “MENU” key input. (Next item)
If the “MENU” key is input while the bottom item is selected, it moves to the top item on the next page.
• Press the auto preset button on the remote controller in the adjustment process mode, and the top item of the
next page will show up regardless of which item appears now.
Page 1
Page 1
→
Page 2
→
...
→
Page 22
→
Page 1
• Press the manual memory button on the remote controller in the adjustment process mode, and the top item of
the same page will show up.
• UP/DOWN of each adjustment vale selected is performed with the VOL (+)/(–) keys input.
• For P16 ~ 17, the unit enters the register select mode with the VOL (+)/(–) keys input while NTSC/PAL is selected,
• For P16 ~ 17, the unit enters the register select mode with the VOL (+)/(–) keys input while NTSC/PAL is selected,
and the cursor moves to the address 01.
• The cursor moves up or down with the “CH (
ù
)/(
Ù
)” keys and moves left or right with the VOL (+)/(–) keys, and a
decision is made with the 12 key.
When the decision is made, the cursor moves to the adjustment value selected, and UP/DOWN of each adjustment
value selected by the “VOL (+)/(–)” keys input is performed.
0
When the decision is made, the cursor moves to the adjustment value selected, and UP/DOWN of each adjustment
value selected by the “VOL (+)/(–)” keys input is performed.
0
↔
1
↔
...
↔
9
↔
A
↔
...
↔
F
↔
0
↔
...
Decide with the 12 key and return to the address select. Move to the next item with the “MENU” key.
During address select, the cursor movement by the “VOL (+)/(–)” keys input is as follows:
Example: 01
During address select, the cursor movement by the “VOL (+)/(–)” keys input is as follows:
Example: 01
↔
02
↔
03
↔
01
↔
...
The cursor movement by the “CH (
ù
)/(
Ù
)” keys input is as follows:
Example: 02
↔
05
↔
...
↔
F6
↔
02
↔
...
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