DOWNLOAD Sharp LC-20M4E (serv.man8) Service Manual ↓ Size: 2.04 MB | Pages: 50 in PDF or view online for FREE

Model
LC-20M4E (serv.man8)
Pages
50
Size
2.04 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
lc-20m4e-sm8.pdf
Date

Sharp LC-20M4E (serv.man8) Service Manual ▷ View online

LC-20M4E
6
REMOVING OF MAJOR PARTS
  1. Detach the Rear cover.
2. Remove the Table stand fixing screws (4 pcs.).
3. Remove the Jack PWB fixing screws (9 pcs.) .
4. Remove the Cabinet B fixing screws (5 pcs.).
  5. Push on the 
hook 5-1 
of the Cabinet B to detach, open the cabinet and detach the hooks
from 
5-2 ∼ 5-9 
, and then detach the Cabinet B.
6. Peel off the 9 wire holders and 8 tapes, then detach the connecting cords.
7. Detach the connectors from each PWB.
4
3
2
Cabinet B
Table Stand
Stand Cover
Hinge Cover
Table Stand (Cover)
5-7
5-8
5-9
5-6
5-5
5-4
5-3
5-2
5-1
Cabinet A
1
Rear Cover
SC1201
SC1202
SC401
Speaker
(Inverter 
 PWB)
(Switch PWB)
6
6
Tape
(Main PWB)
6
Speaker Cover (R)
Jack PWB Holder
Speaker Cover (L)
6
6
P4302
P4702
P4001
P1701
P1703
P1702
P1701
P1702
P1771
P4602
SC4402
P4601
P2003
P701
Tape
Tape
Tape
Tape
Tape
7
7
7
7
7
7
7
7
7
LC-20M4E
8. Remove the Main PWB fixing screws (4 pcs.).
9. Remove the Inverter PWB fixing screws (3 pcs.).
10. Remove the Jack PWB fixing screw (1 pc.) and Ground fixing screw (1 pc.),
and then remove the Reinforcement plate.
11. Remove the LCD unit fixing screws (2 pcs.).
12. Remove the Switch PWB fixing screws (3 pcs.).
Reinforcement 
plate
LCD unit
Main PWB
Jack PWB Ass'y
Switch PWB
Cabinet A
Inverter PWB
12
11
8
9
10
11
P3204
P3203
7
10
8
LC-20M4E
8
»
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 electro-conductive mat.
4. Be careful not to fall, shake and shock the panels.
13. Remove the LCD unit fixing screws (4 pcs.) and
the Rear surface fixing screws (3 pcs.), and then
detach the Shielding plate.
14. Detach the 2 Reflection sheets .
15. Detach the upper and lower Fluorescent lamps.
16. Detach the Light guide plate.
17. Detach the upper and lower Reflection mirrors.
18. Detach the Diffusion sheet and the Reflection
polarising sheet.
Fluorescent lamp (Upper)
(KLMP-0133CEZZ)
Refrection Mirror (Upper)
(PSHEP0223CEZZ)
LCD unit
(CLCDT0060CEZZ)
Fluorescent lamp (Lower)
(KLMP-0134CEZZ)
Refrection Mirror (Lower)
(PSHEP0224CEZZ)
Diffusion sheet
(PSHEP0179CEZZ)
Light guide plate
(PGiDM0058CEZZ)
Reflection polarizing sheet
(PSHEP0180CEZZ)
Reflection sheet-2
(PSHEP0187CEZZ)
13
13
14
15
18
17
15
17
16
Reflection sheet-1
(PSHEP0186CEZZ)
Shielding plate
(PSLDM4712CEFW)
LCD unit
(Front surface)
13
13
9
LC-20M4E
ADJUSTING PROCEDURE OF EACH SECTION
When the microprocessor (IC2001) or the E
2
PROM (IC2004) has been replaced or when the E
2
PROM has been initial-
ized, it is necessary to readjust the microprocessor. Below discussed is the adjustment procedure.
Preparations
Use a dedicated AC adapter or a regulated DC power supply.
AC adapter
:UADP-0218CEZZ
DC power supply :13 V, 3.8 A
Use also a SHARP TV remote controller.
1. Adjustment procedure
Power on (initialization) 
 Adjustment process mode (remote controller) 
 +B adjustment 
Counter bias adjustment 
 White balance adjustment 
 Performance check 
 Factory settings
Calling the adjustment process mode
There are the following two ways to enter this mode.
Turn on the power and press the “ADJUST PROCESS” key on the remote controller.
While holding either KEY4 (pin (81) of the microprocessor) or KEY5 (pin (82) of the microprocessor) at the “L” level,
turn on the power.
Using the keys for the adjustment process
Selecting an adjustment item and adjusting its setting
Using the menu button (M key), select an item, and using the VOL+/- buttons, adjust its setting.(The menu button
serves as a toggle switch. New settings entered with the VOL buttons are made effective immediately.)
Other key-in behaviors
The input select key serves also as a toggle switch.
The input is switched from AV1 to AV2.
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 2 
→ ......
 
Page 6 
 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.
1-1. Initialization
Ground the pins (81) and (82) of IC2001 (microprossor) and turn on the power. The unit will be initialized and then
enter the adjustment process mode.
Select M4E in the MODEL item.
Adjustment process page 1.
Select 20 in the INCH SIZE item.
Adjustment process page 1.
Turn off the power and get the pins (81) and (82) of IC2001 (microprossor) back to their original state.
* Before turning off the power, quit the adjustment process mode with the remote controller. If unavoidably
  the power must be switched off directly, wait at least 5 seconds after making the settings.
1-2. +B adjustment
Feed the standard NTSC colour bar signal.
Enter the adjustment process mode.
Adjust the “+B-ADJ” setting on the adjustment process page 1 so that the voltage at pin (5) of P2001 should be
5.00
±
0.02 V.
Note:  Make the 5.0V adjustment as exactly as possible because this voltage this voltage will be reference level for all
the supply voltages.
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