SHARP LC-13B2E Service Manual

LC-13B2E

SERVICE MANUAL

S91A2LC-13B2E

LCD COLOR TELEVISION

MODEL

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.

LC-13B2E

CONTENTS

Page Page

» IMPORTANT SERVICE SAFETY

PRECAUTION.................................................... 2

» SPECIFICATIONS ............................................. 3

» OPERATION MANUAL ...................................... 4

» DIMENSIONS .................................................... 5

» REMOVING OF MAJOR PARTS ....................... 6

» ADJUSTING PROCEDURE OF

EACH SECTION................................................ 9

» TROUBLE SHOOTING TABLE ........................ 12

» CHASSIS LAYOUT .......................................... 18

» BLOCK DIAGRAM........................................... 20

» OVERALL WIRING DIAGRAM ........................ 24

» DESCRIPTION OF SCHEMATIC DIAGRAM .. 26 » SCHEMATIC DIAGRAM

OPERATION and LED UNIT ..................... 27

MAIN UNIT ................................................ 28

TUNER UNIT ............................................. 42

JACK UNIT ................................................ 44

» PRINTED WIRING BOARD ASSEMBLIES ..... 45

» PARTS LIST

ELECTRICAL PARTS ................................ 48

MAIN UNIT ................................................ 48

OPERATION UNIT..................................... 52

LED UNIT .................................................. 52

JACK UNIT ................................................ 53

CABINET AND MECHANICAL PARTS ..... 54

ACCESSORIES PARTS ............................ 56

PACKING PARTS....................................... 56

» PACKING OF THE SET................................... 57

SHARP CORPORATION

LC-13B2E

IMPORTANT SERVICE SAFETY PRECAUTION

Service work should be perfomed only b y qualified service technicians who are thoroughl y familiar with all safety checks and the servicing guidelines which follow:

WARNING

1. For continued safety, no modification of any circuit should be attempted.

2. Disconnect AC power before servicing.

CAUTION: FOR CONTINUED PROTECTION AGAINST A RISK OF FIRE REPLACE ONLY WITH SAME TYPE FUSE. F1 (2.0A, 250V), F2 (1.6A, 250V) F4 (315mA, 250V) FUSE.

BEFORE RETURNING THE RECEIVER (Fire & Shock Hazard)

Before returning the receiver to the user, perform the following safety checks:

1. Inspect all lead dress to make certain that leads are not pinched, and check that hardware is not lodged between the chassis and other metal parts in the receiver.

2. Inspect all protective devices such as non-metallic control knobs, insulation materials, cabinet backs, adjustment and compartment covers or shields, isolation resistor-capacitor networks, mechanical insulators and etc.

3. To be sure that no shock hazard exists, check for leakage current in the following manner.

• Plug the AC cord directly into a 110~240 volt A C outlet, and connect the DC power cable into the receiver's DC jack. (Do not use an isolation transformer for this test).

• Using two clip leads, connect a 50k ohm, 10 watt resistor paralleled by a 0.15µF capacitor in series with all exposed metal cabinet parts and a known earth ground, such as electrical conduit or electrical ground connected to an earth ground.

• Use an AC voltmeter ha ving with 5000 ohm per volt, or higher, sensitivity or measure the AC voltage drop across the resisor.

• Connect the resistor connection to all exposed metal parts having a return to the chassis (antenna, metal cabinet, screw heads, knobs and control shafts, escutcheon and etc.) and measure the AC voltage drop across the resistor. All checks must be repeated with the AC cord plug connection reversed. (If necessary, a nonpolarized adaptor plug must be used only for the purpose of completing these checks.) Any reading of 0.75V peak (this corresponds to 0.5 milliamp. peak A C .) or more is e xcessive and indicates a potential shock hazard which must be corrected before returning the monitor to the owner .

DVM

AC SCALE

50k ohm

10W

0.15 µF

TEST PROBE

TO EXPOSED METAL PARTS

CONNECT TO KNOWN EARTH GROUND

234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121

SAFETY NOTICE

Many electrical and mechanical parts in LCD television have special safety-related characteristics. These characteristics are often not evident from visual inspection, nor can protection afforded by them be necessarily increased by using replacement components rated for higher voltage, wattage and etc. Replacement parts which have these special safety characteristics are identified in this manual; electrical

and shaded areas in the

Schematic Diagrams

For continued protection, replacement parts must be identical to those used in the original circuit. The use of a substitute replacement parts which do not have the same safety characteristics as the factory recommended replacement parts shown in this service manual, may create shock, fire or other hazards.

components having such features are identified by “ å”

234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121

Replacement Parts Lists

and

Specifications

LC-13B2E

Items

LCD panel Number of dots Video colour system

TV-Standard (CCIR) TV-Tuning System

TV function STEREO/BILINGUAL

AUTO PRESET

CATV Brightness Lamp life Viewing angles Audio amplifier Speakers

AV-IN 1

AV-IN 2 Terminals OUT

Antenna

Headphones OSD language Power requirement Weight Accessories

Model

LC-13B2E

13” BLACK TFT LCD 921,600 dots PAL/SECAM/NTSC BG/L/DK, I, M, N Auto preset 197 ch. NICAM, IGR Yes ~ Hyper Band 430 cd/m 60,000 hours H: 160° V: 160°

2.1 W × 2 4 × 7 cm Oval, 2 pcs. RGB S-VIDEO, VIDEO, AUDIO AUDIO DIN

3.5 mm ø jack (Rear) English/German/French/Spanish/Italian/Swedish/Dutch DC 12 V, AC 110–240 V, 50/60 Hz

3.8 kg, incl. stand, excl. accessories Remote control, Btteries, AC adapter, AC cord, Cable clamps

Specifications are subject to change without prior notice.

LC-13B2E

Operation Manual

Main unit (front view)

Upper control panel

Volume (+)/(–) CH ( )/( ) MENU TV/VIDEO

(MAIN POWER)

CH MENU TV/VIDEO

Speaker

Remote sensor window

(The actual location is not visible.)

Note:

■ TV/VIDEO, CH( )/( ), and Volume (+)/(–) on the main unit have the same functions as the same buttons on the remote control. Fundamentally, this operation manual provides a description based on operation using the remote control.

Speaker

To change the vertical angle of the LCD TV set, tilt the screen up to 10 degrees forward or 20 degrees backward. The TV set can also be rotated 90 degrees horizontally. Please adjust the angle so that the TV set can be watched most comfortably.

Remote sensor indicator

A red indicator blinks when the TV set receives the remote control signal.

POWER/STANDBY indicator

A green indicator lights when the power is on and a red indicator lights when in the standby mode (the indicator will not light when the main power is off).

Terminals

Antenna

AV-IN 1 (21-pin EuroSCART)

AUDIO OUT (L) AUDIO OUT (R) HEADPHONES POWER INPUT

DC 12 V

Rear view

Carrying handle

AV-IN 2

VIDEO

AUDIO

S-VIDEO

VIDEO

AUDIO (L) AUDIO (R)

S-VIDEO

Remote control

(Power)

OK, Programme Table

Turns on the menu

the menu is displayed.

GREEN, Sound Menu

RED, Picture Menu

INFO

information when

TEXT

Volume (+)/(–)

Flashback

Returns to the

previous channel.

SOUND

INFO

(

RED)(GREEN)(YELLOW)(CYAN

TV/VIDEO

END

MENUTEXT

)

SOUND

Switches the sound mode.

END, Status Display

Turns on the status display when the menu is not displayed.

Upward / Downward Selection

MENU Right / Left Selection CYAN, Teletext Subtitle

YELLOW, Standard Value

Mute

CH ( )/( )

Channel Select

TV/VIDEO

Dimensions

LC-13B2E

(Unit: mm)

LC-13B2E

REMOVING OF MAJOR PARTS

1. Remove the back cover.

2. Remove the table stand fixing screws (4 pcs.).

3. Remove the cabinet B fixing screws (9 pcs.) and detach the cabinet.

4. Peel off the tape.

5. Detach the connector from each PWB.

Back cover

Cabinet B

Table stand

P4004

P3604

LED PWB

P4001

Terminal PWB

SC903

P701

P3600

P702

SC902

P902

P904

Tape

P2005

SC901

P903

P901

Operation PWB

SC802

SC801

P305

SC5702

P2004

Main PWB

P2006

Jack PWB

P5001

P304

SC1202

SC1201

P5701

6. Remove the fixing angle fixing screws (2 pcs.).

7. Remove the terminal PWB fixing screws (3 pcs.).

8. Remove the jack PWB fixing screw (2 pc.).

9. Remove the main PWB fixing screws (1 pcs.).

10. Remove the LED PWB fixing screws (2 pcs.).

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

12. Remove the chassis frame fixing screws (4 pcs.)

LC-13B2E

Terminal PWB

Jack PWB

Main PWB

Chassis Frame

Operation PWB

LED PWB

LC-13B2E

» 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.

13. Remove the LCD display unit fixing screws (4 pcs.).

14. Detach the two diffusion sheets and reflection/deflection sheet.

15. Detach the four reflection mirrors.

16. Remove the fluorescent lamp.

17. Detach the lamp guide plate.

18. Detach the two lamp reflection sheets.

Reflection Mirror

LCD Display Unit

Fluorescent Lamp (KLMP-0109CEZZ)

Light Guide Plate (PGiDM0064CEZZ)

Diffusion Sheet (PSHEP0244CEZZ)

Reflection/deflection Sheet (PSHEP0245CEZZ)

Lamp Reflection Sheet-1

(PSHEP0246CEZZ)

Lamp Reflection Sheet-2 (PSHEP0247CEZZ)

Sheilding Plate (PSLDM4660CEFW)

Reflection Mirror

LC-13B2E

ADJUSTING PROCEDURE OF EACH SECTION

[1] Entering the MAIN side adjustment process mode

There are three methods below.

1) Press the “Adjustment process key” on the remote control after turning on the power.

2) Pressing both the MENU key and the TV/VIDEO key on the main body, tur n on the power. Then, press the volume DOWN key and the tuning DOWN key at the same time.

3) Turn on the power with falling either KEY4 (pin (81) of microprocessor) or KEY5 (pin (82) of microprocessor) to “L”.

[Note] For the method 3), the ROM is initialized at the same time. Therefore, 3) must be executed, if IC2004 or

IC2001 is changed. For 1) or 2), the main body only enters the MAIN side adjustment process.

[2] Entering the TUNER side adjustment process mode

4) Entering the TUNER side adjustment process

MENU key on the main body → Cursor UP key (remote control) → Select the position shown in the figure below and press the M key (remote control) within 1 second. → Enters the adjustment process.

Direct control at TV

Black level Contrast Colour

: select

M: Back E: End

[3] Adjustment

MAIN side adjustment (Press the “M” key to move the cursor and press the volume UP/DOWN key to make an adjustment.)

• Power supply voltage adjustment (+B 5V)

• Model setting

• Inch size setting

• COMMON BIAS adjustment of LCD module

• CUTOFF adjustment

TUNER side adjustment (Press the tuning UP/DOWN key to move the cursor and press the volume UP/DOWN key to make an adjustment.)

• Horizontal size adjustment (LCD adjustments)

• Video adjustment (other adjustments)

Y delay Subcontrast Subcolour Subbrightness Tint offset AGC gain start

The TUNER side adjustment is possible. However, it is recommended to replace EAROM (I2).

LC-13B2E

AV1 tint offset 1 1 1 AV2 sub contrast 0 2 0

AVS

3-1. +B adjustment

Page 9 of MAIN side adjustment process +B-ADJ Adjust the voltage of the positive side of C753 to 5.0 ±0.05V.

PAL/PAL60 SECAM NTSC y delay 7 6 tint offset 0 0 sub contrast 2 2 sub colour 25 25 y delay 7 5 4

sub colour 30 30 20 y delay 7 5 1 tint offset 1 1 1 sub contrast 0 0 0 sub colour 30 30 30

AGC gain start 23

3-2. Model setting

Page 9 of MAIN side adjustment process MODEL Set to B2E.

3-3. Inch size setting

Page 9 of MAIN side adjustment process INCH SIZE Set to 13.

3-4. COMMON BIAS adjustment of LCD module

Page 9 of MAIN side adjustment process COM BIAS Input the picture of gray scale and adjust it so as to obtain the best contrast.

3-5. CUTOFF adjustment

Page 9 of MAIN side adjustment process R CUTOFF, B CUTOFF Adjust it so as to obtain the optimal colour balance.

[4] Lamp error detection

4-1. Functional description

This LCD colour television has a function (lamp error detection) to be turned OFF automatically for safety when the lamp or lamp circuit is abnormal. If the lamp or lamp circuit is abnormal, or some other errors happen, and the lamp error detection is executed, the followings occur. 1 The main unit of television is turned OFF 5 seconds after it is turned ON. (The pow er LED on the front side

of TV turns from green to red.)

2 If the situation 1 happens 5 times sequentially, television can not be turned ON. (The power LED remains

red.)

4-2. Countermeasures 4-2-1.Check when turning OFF the lamp error detection

When television is turned OFF by the lamp error detection mentioned above, it enters the adjustment process with the power LED red. Entering the adjustment process turns OFF the error detection and turns ON TV. This enables the operation check to detect errors in the lamp or lamp circuit. Check whether "ERROR NO RESET" on line 7, page 1 of the adjustment process is 1 or more. If it is 1 or more, it indicates the lamp error detection was executed.

4-2-2.Resetting of the lamp error count

After confirming that the lamp or lamp circuit is normal, reset the lamp error count. Select "ERROR NO RESET" on line 5, page 1 of the adjustment process and set the number to 0 using the volume button.

LC-13B2E

Page 1 of the adjustment process

+B– A D J 160 M O D E L C2E INCH I S I ZE 13 N T S C P W M F R Q 0C0 ERROR NO RESET 5 P M U T E OFF

Reset 0

C 2 E V E R 1 . 0 0

Afterwards, perform the operation check to confirm that the lamp error detection does not function.

LC-13B2E

No picture, No sound

Check all the settings microprocessor's adjust process menu.

Do F2 and F4 function?

Are T701's secondary

outputs, +38V, +16V, +9V,

+5V and -8V normal?

Remove F2 and F4 and

check the load side.

Is there short-circuiting?

Is there short-circuiting of

T701 primary side periphery,

Q751, Q753 and P901.

Replace F2 and F4.

Check P901 and

connection cable.

Is T701's primary oscillator

waveform normal?

Check T701's secondary

load.

Yes Yes

No No

Yes

Fluorecent lamp failure to light up

Does F1 function?

Is the pin (34) of IC1201 in

the "H" state?

Is the Q3603 short-circuiting?

Is there short-circuiting of

T5701 and T5702 primary

side periphery, Q751~Q753.

Yes

Replace the fluorecent lamp

with new one and check

again.

Yes

Check the OFL1 line, IC1201

and their peripheral parts.

Check Q3603 and their

peripheral parts.

Check T5701, T5702,

Q5701~Q5703 and

connection cable.

TROUBLE SHOOTING TABLE

TROUBLE SHOOTING TABLE (Continued)

No picture

Check all the settings microprocessor's adjust process menu.

Is in/output of

IC801 normal?

Is in/output of

IC1201 normal?

Check IC801

and its

peripheral parts.

Check IC1201

and its

peripheral parts.

Check IC402

and its

peripheral parts.

Check IC801,

AV1 line and its

peripheral parts.

Check LCD

panel voltages

and waveform.

Yes

No picture

at all

Is in/output of

IC402 normal?

Is input at pin

(73) of IC801

normal?

Yes

No TV and

VIDEO 1

output

Is voltages at

pin (3) of W7

and pins (3), (4)

and (5) of W14

tuner normal?

Is output at pin

(2) of W7 tuner

normal?

Check the

power line.

Check tuner

and its

peripheral parts.

Is input at pin

(3) of IC402

normal?

Is the pins (2)

and (4) of IC402

at "H" and "L"

state?

Yes

No TV output

Is the pins (65)

and (66) of

IC2001 at "H"

and "L" state?

Yes

Check the its

line.

Check the its

line.

Check IC402

and its

peripheral parts.

Is input at pin

(1) of IC402

normal?

Is the pins (2)

and (4) of IC402

at "L" state?

Check the its

line.

Check the its

line.

Check IC402

and its

peripheral parts.

Is the pins (65)

and (66) of IC2001

at "L" state?

Yes

No VIDEO 1

output

LC-13B2E

No picture

Check all the settings microprocessor's adjust process menu.

Is input at pin

(74) of IC801

normal?

Check the AV2

line and their

peripheral parts.

Check the W9,

SY-line, SC-line

and their

peripheral parts.

No VIDEO 2

output

Is input at pins

(71) and (72) of

IC801 normal?

No S-VIDEO

output

Is input at pin

(70) of IC801

normal?

Check the

V2VO line and

their

peripheral parts.

No line

output

Is input at pins

(1), (2), (3), (56),

(57) and (79) of

IC801 normal?

Is output at pins

(11), (13) and

(16) of I4

normal?

Check IC801

and its

peripheral parts.

Check I13 and

its

peripheral parts.

Check I9 and

its

peripheral parts.

Check I4 and

its

peripheral parts.

Is output at pins

(11), (13) and

(16) of I13

normal?

Yes

No TELETEXT

output

Is output at pins

(44)~(49) of I9

normal?

Yes

TROUBLE SHOOTING TABLE (Continued)

+ 32 hidden pages