Sharp LC-13B2M Schematic

SERVICE MANUAL LCD COLOUR TELEVISION MODELS LC-13B2H/M

LC-13B2H/M

SERVICE MANUAL

S91B2LC-13B2H

LCD COLOUR TELEVISION

LC-13B2H

MODELS

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 be used.

LC-13B2M

CONTENTS

Page

» IMPORTANT SERVICE SAFETY PRECAUTION................................................................................. 2

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

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

» DIMENSIONS ....................................................................................................................................... 6

» REMOVING OF MAJOR PARTS .......................................................................................................... 7

» ADJUSTING PROCEDURE OF EACH SECTION ............................................................................. 10

» TROUBLE SHOOTING TABLE ........................................................................................................... 14

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

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

» DESCRIPTION OF SCHEMATIC DIAGRAM ..................................................................................... 22

» SCHEMATIC DIAGRAMS................................................................................................................... 23

» PRINTED WIRING BOARD ASSEMBLIES........................................................................................ 38

» PARTS LIST

ELECTRICAL PARTS..................................................................................................................... 45

MAIN UNIT ..................................................................................................................................... 45

TERMINAL UNIT............................................................................................................................ 47

OPERATION UNIT ......................................................................................................................... 50

JACK UNIT...................................................................................................................... ............... 51

R/C RECEIVER UNIT .................................................................................................................... 51

SUPPLIED ACCESSORIES PARTS .............................................................................................. 51

PACKING PA RTS ........................................................................................................................... 51

CABINET PARTS LIST................................................................................................................... 52

CABINET AND MECHANICAL PARTS.......................................................................................... 53

» PACKING OF THE SET ...................................................................................................................... 55

SHARP CORPORATION

LC-13B2H/M

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:

IMPORTANT SERVICE SAFETY PRECAUTION

WARNING

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

2. Disconnect AC power before ser vicing.

CAUTION: FOR CONTINUED PROTECTION A GAINST A RISK OF FIRE REPLACE ONLY WITH SAME TYPE FUSE. F3701 (1.6A, 250V), F3703 (2A, 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

Items ......................................................... 13" LCD COLOUR TV, Model: LC-13B2H/M

LCD panel..................................................................................................13" TFT LCD

Number of dots ..................................................................................921,600 dots VGA

Video colour systems....................................................................... World multi system

TV FUNCTION

TV Standard (CCIR) .................................................................................I/DK/M/BG

TV Turning System ..................................................................... Auto preset turning

STEREO/BILINGUAL ...................................................... NICAM-BG, I, DK/IGR-BG

Universal R/C for TV only .................................................................................... Yes

AUTO PRESET.................................................................................................... Yes

CATV.....................................................................................................~Hyper Band

4-LINE DIGITAL COMB FILTER ............................................................................... Yes

Brightness.......................................................................................................430 cd/m

Lamp life ....................................................................................................60,000 hours

Viewing angles........................................................................................H: 160° V: 160°

Audio output..................................................................................................... 2.1W × 2

Speakers....................................................................................... 4 x 7 cm Oval, 2 pcs.

Terminals

AV1 .......................................................................Composite Video, S-Video, Audio

AV2 IN/OUT ......................................................................... Composite Video/Audio

Component ........................................................................................Y, PB, PR/Audio

Headphone Jack........................................................................... 3.5 mm φ jack (Rear)

OSD LANGUAGE ..................................................................... English/Chinese/Arabic

Power requirement................................................... DC 12V, AC 110 - 240 V, 50/60 Hz

Weight........................................................................................ 3.9 kg w/o accessories

Accessories ......................................................... R/C, Batteries, AC adaptor, AC cord,

Operation manual, Cable clamps, Antenna cable

LC-13B2H/M

Specifications are subject to change without prior notice.

LC-13B2H/M

LOCATION OF USERS CONTROL

Main unit (front view)

Speaker

SLEEP indicator

The SLEEP indicator lights up red when

the SLEEP TIMER is set to on.

Speaker

Upper control panel

Remote sensor window

(The actual location is not visible.)

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.

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).

VOL CH MENU TV/VIDEO MAIN POWER

PRESET

■

TV/VIDEO, CH (

)/( ), and VOL (+)/(–) 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 with the remote

control.

Note:

VOL (+)/(–)

CH (

)/(

)

TV/VIDEO

MAIN POWER

Auto Preset Details are

described.

Main unit (rear view)

ANT.

VIDEO

AUDIO

HEAD

PHONE

POWER

INPUT

DC12V

AV-IN 2/OUT

COMPONENT

VIDEO

S-VIDEO

AUDIO

AV-IN 1

Antenna terminal

AUDIO (L)

AUDIO (R)

HEADPHONE

POWER INPUT

(DC 12V)

AUDIO (L)

AUDIO (R)

VIDEO

RPB

AV-IN 2/OUT

COMPONENT

AUDIO (L)

AUDIO (R)

VIDEO

S-VIDEO

AV-IN 1

Operation Manual

LC-13B2H/M

Remote control

VOL

TV/VIDEO

DISPLAY

BRIGHTSLEEP

POWER

MPX

-/--

MENUSLEEP

MENU cursor

(Right/Left Selection)

VOL (+)/(–)

POWER

TV/VIDEO

MENU cursor

(Upward/Downward Selection)

CHANNEL SELECT

CH ( )/( )

Selects next higher channel

Selects next lower channel

FLASHBACK

Returns to previous channel

DISPLAY

Press....Displays receiving channel for 10 seconds.

Channel indication reduces in size after

about 10 seconds.

Press again...Removes display.

MUTE

Press....Stops sound.

Press again...

Returns sound to previous level.

MPX

Switching Audio mode.

BRIGHT

The brightness can be

switched between 3 levels.

LC-13B2H/M

POWER

SLEEP

429

267

264.96

333

264

198.72

200.8

Dimensions

VOL CH MENU

TV/VIDEO

MAIN POWER

PRESET

59.3

271.2

AV-IN 1

92.7

148.5 40.5

18 9

177.8

0.5

74.4

229.4102.9

332.3

ANT.

100

VIDEO

AUDIO

S-VIDEO

15 15

8.4

AV-IN 2/OUT

VIDEO

AUDIO

COMPONENT

AUDIO

HEAD

PHONE POWER

INPUT

DC12V

1414

35.4

14141414141314

100

(Unit: mm)

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. Release the wire holders at 2 locations and peel off the tape.

5. Detach the connector from each PWB.

LC-13B2H/M

Back cover

Cabinet B

Table stand

R/C Receiver PWB

Tape

P4004

Terminal PWB

P3501

P4005

P3600

P3500

Operation PWB

P3702

SC2001SC3403

P2003

P3402

Main PWB

P2004

Jack PWB

SC5701

SC1201

P5701

SC1202

Wire holder

LC-13B2H/M

6. Remove the terminal PWB fixing screws (2 pcs.).

7. Remove the jack PWB fixing screw (1 pcs.).

8. Remove the main PWB fixing screws (2 pcs.).

9. Remove the R/C receiver PWB fixing screws (2 pcs.).

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

11. Remove the PWB frame fixing screws (4 pcs.)

Terminal PWB

PWB Frame

Jack PWB

Main PWB

Operation PWB

R/C Receiver PWB

» 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.

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

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

14. Detach the four reflection mirrors.

15. Remove the fluorescent lamp.

16. Detach the light guide plate.

17. Detach the two lamp reflection sheets.

LC-13B2H/M

Reflection Mirror

LCD Display Unit

Fluorescent Lamp （KLMP-0109CEZZ）

Light Guide Plate

Diffusion Sheet

Reflection/deflection Sheet

Lamp Reflection Sheet-1

（PSHEP0246CEZZ）

Lamp Reflection Sheet-2 （PSHEP0247CEZZ）

Sheilding Plate

Reflection Mirror

LC-13B2H/M

ADJUSTING PROCEDURE OF EACH SECTION

Preparation for Adjustments

Use the dedicated AC adaptor or stable DC power supply. LC13B2 AC adaptor: UADP-0226CEPZ DC power supply: 12 ± 0.5V, 3.0 (A)

[1] Adjusting procedure

1-1. Checker adjustment

Po wer ON (initialization) → Setting of model and inch siz e → Model data tr ansf er to the setting E2PROM (I2C) → Adjustment processing mode → Adjustment (+B adjustment)

1-2. Finish processing adjustment

Setup → Power ON → Adjustment processing mode (Remote control) → Opposed bias, TV contrast and white balance adjustments

[2] Entering the adjustment processing mode

There are the following two methods.

• Setting the 81 pin (KEY4) or 82 pin (KEY5) of IC2001 (microcomputer) to “L”, turn on the power.

• When service is given: A power source SW is made on with pushing an TV/VIDEO key and a MENU key at the same time.(K of the inspection process mode is displayed by the upper left of the image plane.) → Next, a tuning DOWN key and a sound volume DOWN key 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 po wer source SW, off with

R/C are good.)

[3] Key operation in the adjustment processing

Selection of the receiving channel

• The receiving channel UP/DOWN is performed with the tuning UP/DOWN key. 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.

• V arious adjustments The adjustment is performed for each item by the menu select, tuning UP/DOWN or volume UP/DOWN key (main body and remote control).

• Adjustment item is chosen with the cursor UP/DOWN key.

• The adjustment item makes a toggle operation with the menu select key input. (Next item) If the menu select key is input while the bottom item is selected, it moves to the top item on the next page.

[4] Initialization

4-1. Connect the 81 pin and 82 pin of IC2001 (microcomputer) to GND, and turn on the power. 4-2. Select the model name (B2H). 4-3. Select the inch size (13).

[5] Adjustment

5-1. +B adjustment...R3760 and a half fixations VOL

1) Receive the colour bar.

2) Adjust the voltage of the 38 pin of SC3403 to 5.00V±0.02V. Note: Since 5.0V is a reference voltage of all power voltage, adjust it precisely.

5-2. Counter-bias adjustment...Page 2 COM BIAS

Vary the "COM BIAS" setting on Page 2 of the adjustment process so that the contrast be sharpest (black looks most sinking). The adjustment guideline is around 57 for Model LC-13B2H/M.

5-3. TAMP adjustment

1) Receive the colour bar.

2) When reading value of adjustment process the page 2 "Y" is not within value of the bottom table, the adjustment of "NTSC TAMP" of the same page is done, and reading value of "Y" is made to be within value of the bottom table.

Model LC13B2 LC15B2 LC20B2 Setting value B8~C2 B8~C2 BB~CA

3) If the adjustment of “NTSC TAMP” is executed, write its adjustment value to the followings manually.

“PAL TAMP” “SECAM TAMP” “PAL-M TAMP” “PAL-N TAMP”

LC-13B2H/M

(Screen of the page 2 of the adjustment processing menu OSD)

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26

0 1 2 3 4 5 6

7 8

10 11

12 13

COM B I AS 5 7 NTSC TAMP 24

PAL TAMP 24 SECAM TAMP 24

PAL - M TAMP 24 PAL - N TAMP 24 RCU TOF F

GCUTOF F

BCU TOF G3 B3 R3 00 00 00 G1 B4 Y 0 0 00 BE

TAMP H

TAMP L

Y Data

(White 75%)

–

5 0

–3

C2 B8

5-4. White balance adjustment

1) Receive the monoscope pattern.

2) Adjust “RCUTOFF” and “BCUTOFF” on the page 2 of the adjustment processing so as to obtain the colour of the same level as the standard set. Caution: For the adjustment processing of “RCUTOFF” and “BCUTOFF”, adjust them in the indication value range of ... –9, –7, ... –1, +1, ... +7, +9. When it becomes even-numbered value, side favor noise sometimes occurs in the monochrome signal of the specific gradation.

LC-13B2H/M

[6] Lamp error detection

6-1. Functional description

This LCD color 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 po w 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.)

6-2. Countermeasures 6-2-1. Check when tur ning 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 9, page 1 of the adjustment process is 1 or more. If it is 1 or more, it indicates the lamp error detection was executed.

6-2-2. 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 9, page 1 of the adjustment process and set the number to 0 using the volume button.

Page 1 of the adjustment process

+ B – A D J 160 M O D E L B2H I NCH S I ZE 13 N T S C P W M F R E Q 0C0 P A L P W M F R E Q 0BD N T S C P W M D U T Y 0 PAL P W M DUTY 0

T V G A I N OFF

ERROR NO RESET 5 P U B L I C M O D E ON

B 2 H V E R 1 . 0 0

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

Reset 0

[7] PUBLIC MODE

• How to enter into PUBLIC MODE

1.Turn off TV by pressing MAIN POWER switch.

2.While pressing at same time VOL(+) key and CH(ù) key, press MAIN POWER switch. For more than 2 seconds. TV will turn on, and you will see the screen display a setting of PUBLIC MODE.

• Setting screen of "PUBLIC MODE"

PUBLIC MODE MAXIMUM VOLUME [ 60] VOLUME FIXED [VARIABLE] REMOTE CONTROL [RESPOND] USER CONTROL [RESPOND] ON SCREEN DISPLAY [YES ] AV1 INPUT [NORMAL ] RESET ENTER

1 ↔ 2 ··· ↔ 59 ↔ 60 VARIABLE ↔ FIXED RESPOND ↔ LIMITED RESPOND ↔ NO RESPOND YES ↔ NO NORMAL ↔ START ↔ AV1 FIXED

LC-13B2H/M

Factory setting

Adjust setting

1. You can select each item of functions by pressing cursor UP/DOWN keys on the remote control or CHù/Ù keys on the LCD TV. The letter of selected item tur ns to yellow colour when you selected it.

2.The setting position of each item of functions are made by pressing cursor RIGHT/LEFT keys on the remote control or VOL(+)(–) keys on the LCD TV.

3.Select ENTER position after you set all functions, and press cursor RIGHT/LEFT keys on the remote control or VOL(+)(–) keys on the LCD TV for confirmation. Unless otherwise you make ENTER confirmation, the settings will not be memorized.

6-functions of Public Mode settings expand for public application.

1. MAXIMUM VOLUME(1--------60) You can set the maximum volume at your desire level.

2. VOLUME FIXED (VARIABLE/FIXED) You can fix the sound volume at your desire level. When you set to "FIXED", the sound volume which you just set is fixed.

3. REMOTE CONTROL (RESPOND/LIMITED) If you set "LIMITED", remote control keys of POWER, CHù/Ù, VOL(–)(+) and BRIGHT keys are responded, but other keys are not responded. This is a position that you can not make MENU adjustments.

4. USER CONTROL (RESPOND/NO RESPOND) "NO RESPOND" means that the TV does not respond when you press a user control buttons except main power button on the main unit.

5. ON SCREEN DISPLAY (YES/NO) If you set "NO" position, OSD will not appear.

6. AV1 INPUT (NORMAL/START/AV1 FIXED) Some application use DVD or VCR connecting to AV1 input of our monitor and you will not want to change it to other mode, such as Component or AV2 input. You can set the position of input "AV1 FIXED". For other application that you want to start AV1 every time when you press power b utton, and y ou ma y select other input mode after then, set it at "START" position.

7. RESET You can cancel all Public Mode settings. (It returns to the factory setting.)

8. ENTER You make sure after you have specified all functions, then press the enter key. Unless otherwise you press the enter key, all positions that you have selected will not be set.

LC-13B2H/M

No picture

at all

Yes

Are inputs

and outputs

of IC801 as

specified?

Check all the settings on the microprocessor’s adjust process menu.

No picture

Check IC801

and its

peripheral

parts.

Yes

Are inputs

and outputs

of IC1201 as

specified?

Check

IC1201 and

its peripheral

parts.

Check LCD

panel voltage

and

waveform.

No TV and

VIDEO 1

output

Yes

Are inputs

and outputs

of IC402 as

specified?

Check IC402

and its

peripheral

parts.

Is input at Pin

(73) of IC801

as specified?

Check IC801,

AV1 line and

their

peripheral

parts.

No TV

output

Yes

Are voltages

at Pins (6),

(7) and (9) of

tuner as

specified?

Check the

power line.

Yes

Is output at

Pin (19) of

tuner as

specified?

Check the

tuner and its

peripheral

parts.

Is input at Pin

(3) of IC402

as specified?

Check the

line in

question.

Yes

Check IC402

and its

peripheral

parts.

Yes

Are Pins (2)

and (4) of

IC402 at “H”

and “L”

respectively?

Are Pins (65)

and (66) of

IC2001 at “H”

and “L”

respectively?

No VIDEO

1 or 2

output

Yes

Is input at Pin

(1) of IC402

as specified?

Check the

line in

question.

Yes

Are Pins (2)

and (4) of

IC402 both at

“L” or Pins (4)

of IC402 at

“H”?

No S

VIDEO

output

Are inputs at

Pins (71) and

(72) of IC801

as specified?

Check

SC5001, SY

line, SC line

and

peripheral

parts.

COMPONENT

output

Is input at

Pins (4), (5),

(6) and (75)

of IC801 as

specified?

Check J3404,

J3405, J3406,

DVD-Y line,

PB line, PR

line and

peripheral

parts.

Are Pins (65)

and (66) of

IC2001 both

at “L”or Pins

(66) of IC1201

at “H”?

Check IC402

and its

peripheral

parts.

Yes

Check the

line in

question.

Yes

Check the

line in

question.

TROUBLE SHOOTING TABLE

TROUBLE SHOOTING TABLE (Continued)

No picture and sound

No colour

No TV colour

No S-VIDEO colour

Yes

Do F3701 and F3703

function?

Check all the settings on the microprocessor’s adjust process menu.

Are secondary outputs

(+34V, +15V, +10V, +5V, -9V)

of T3701 as specified?

Yes

Are the oscillation waveform

at T3701’s primary side as

specified?

Yes

Disconnect F3701 and

F3703. Is the load side

short-circuited?

Yes

Is any of T3701’s primary

side, Q3700 and S4701 short-

circuited?

Check J3702, its peripheral

parts and connection cable.

Replace F3701 and F3703.

Check S4701 and

connection cable.

Check the secondary-side

load of T3701.

Fluorescent lamp

Yes

Does F3703 function?

Yes

Is Pin (34) of IC1201 at “H”?

Yes

Are the oscillation waveforms

at the primary side of T5701

and T5702 as specified?

Yes

Replace F3703.

Is input at Pin (71) of IC801

as specified?

Check SC5001, SC line and

peripheral parts.

Yes

Check the line, IC1201 and

its peripheral parts.

Check Q5701, Q5702,

T5701, T5702, Q5703 and

their peripheral parts.

Replace the fluorescent lamp

and check the oscillation

waveform again.

No VIDEO colour

Check all the settings on the microprocessor’s adjust process menu.

No COMPONENT colour

Is input at Pins (4) and (6) of

IC801 as specified?

Check J3405, J3406, PB line,

PR line and peripheral parts.

LC-13B2H/M

+ 33 hidden pages