DOWNLOAD Sharp LC-20B4E (serv.man15) Service Manual ↓ Size: 6.33 MB | Pages: 80 in PDF or view online for FREE

9. Remove the inverter-A PWB fixing screws (2 pcs.).

10.Remove the inverter-B PWB fixing screws (1 pc.).

11.Remove the main PWB fixing screws (3 pcs.).

12.Remove the 21-pin terminal fixing screw (2 pcs.).

13.Remove the tuner PWB fixing screws (3 pcs.) and detach the chassis frame cover fixing hooks.

14.Remove the R/C, LED PWB fixing screws (2 pcs.).

15.Remove the operation PWB fixing screws (2 pcs.).

13

9

10

Inverter-A 
PWB

Main PWB

Chassis Frame

Chassis Frame Cover

Tuner
PWB

Inverter-B 
PWB

Operation PWB

15

14

R/C, LED PWB

11

12

13

13

»

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.

16. Remove the LCD panel unit fixing screws (4 pcs.).
17. Remove the ITO earth spring fixing screw (1 pc.).
18. Remove the reflection/deflection, prism, diffusion, ITO sheets and diffusion panel.
19. Remove the lamp fixing holder fixing screws (6 pcs.).
20. Detach the lamp unit-A/B.
21. Remove the reflection mirror fixing screws. (6 pcs.).

21

20

19

17

18

19

16

16

Back shield
 (PSLDM4685CEFW)

Reflection Mirror
 (PMiR-0296CEZZ)

Lamp Fixing Holder
 (LHLDZ2176CEZZ)

Diffusion Panel
 (PCOVU0107CEZZ)

ITO Sheet
 (PSHEP0289CEZZ)

Prism Sheet
 (PSHEP0287CEZZ)

20" LCD Panel Unit

Reflection/Deflection Sheet
 (PSHEP0286CEZZ)

Diffusion Sheet
 (PSHEP0288CEZZ)

ITO Earth Spring
 (MSPRP1220CEFW)

Lamp Fixing Holder
 (LHLDZ2176CEZZ)

Lamp Unit-B
 (KLMP-0125CEZZ)

Lamp Unit-A
 (KLMP-0124CEZZ)

»

Precautions at the time of the side B(back) service of main unit.
1. Remove only SC2002 of the FFC for connection between Main unit(SC2002) and Tuner unit(SC3902), and con-

nect the extended cable (QCNW-A369WJZZ) for service.

2. Peel off the tape.
3. Remove only P701 of the FFC for connection between Main unit(P701) and Tuner unit(P1902), and connect the

extended cable (QCNW-B194WJZZ) for service.

4. Remove the main unit fixing screws(2 pcs.), a substrate is reversed.

Tuner PWB

Main PWB

Main PWB
(Side B)

1

3

2

4

Tape

SC2002

SC3902

P701

P1902

Step

Part No.

Description

1

QCNW-A369WJZZ

Extension Cable 50-pin Main (SC2002)-Tuner (SC3902)

3

QCNW-B194WJZZ

Extension Cable 12-pin Main (P701)-Tuner (P1902)

The best adjustment is made before shipping. If any position deviation is found or after part replace is performed,
adjust as follows.

Use the dedicated AC adaptor or stable DC power supply.
LC20B4E AC adaptor: UADP-0241CEPZ
DC power supply: 13V 5.4A

• Checker adjustment

Power ON (Adjustment processing mode) 

→ 

+B adjustment 

→

 Counter bias adjustment 

→ 

TAMP (Contrast)

adjustment 

→ 

White balance adjustment

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

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.)

• 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.

• 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)

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 2 

→

 ... 

→

 Page 57 

→

 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.