Sharp LC-15A2M Schematic

LC-15A2M

SERVICE MANUAL

S31Q9LC-15A2M

LCD COLOUR 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-15A2M

CONTENTS

Page

IMPORTANT SERVICE SAFETY PRECAUTION.......

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

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

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

» ADJUSTING PROCEDURE OF

EACH SECTION.................................................8

» TROUBLE SHOOTING TABLE .........................10

» DESCRIPTION OF SCHEMATIC DIAGRAM ... 13

» CHASSIS LAYOUT ...........................................14

» BLOCK DIAGRAM............................................16

» SCHEMATIC DIAGRAM ...................................18

» PRINTED WIRING BOARD ASSEMBLIES......25

» PARTS LIST

ELECTRICAL PARTS ...................................28

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

TERMINAL UNIT ..........................................33

OPERATION UNIT........................................34

R/C RECEIVER UNIT...................................34

CABINET AND MECHANICAL PARTS ........34

SUPPLIED ACCESSORIES......................... 36

PACKING PARTS..........................................36

» PACKING OF THE SET ....................................37

Page

The component parts of this model are partially different depending on their suffix symbols. Before servicing the units, be sure to check the suffix symbol on the model label that is applied on the back of the unit.

SHARP CORPORATION

Example of suffix symbol:

LCD COLOUR TV SERIAL NO. MODEL LC-15A2M 12V 2.2A, 27W

X xxxxxxxxx

SHARP CORPORATION

MADE IN JAPAN

Suffix "X" for Australlia

LC-15A2M

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. F3701 (1.25A, 250V), F3702 (1.25A, 250V), F3751 (2.0A, 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 1.5k 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 35V peak (this corresponds to 0.7 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

1.5k ohms 10W

0.15 µF

TEST PROBE

TO EXPOSED METAL PARTS

CONNECT TO KNOWN EARTH GROUND

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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”

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Replacement Parts Lists

and

Specifications

Power Input............................................................................................DC 12V (Receiver)

Power Consumption..............................................................27 W (Connected to DC 12V)

LCD Panel Size...............................................................................................15" TFT LCD

Number of Pixels................................................................................921,600 pixels (VGA)

Audio Amplifier....................................................(Front) 0.6 W + 0.6 W (at 10% distortion)

Speakers

Size ........................................................................................... (Front) 3 × 4 cm (2 pcs)

Voice Coil Impedance ............................................................................. (Front) 32 ohm

Antenna Input Impedance.................................................................... 75 ohm unbalanced

Video Colour Systems ..........................................................................PAL/NTSC/SECAM

Receiving Frequency

VHF Channels ........................................................................... 44,25 thru 464,25 MHz

UHF Channels .........................................................................471,25 thru 863,25 MHz

Weight............................................................................................ 3.7 kg w/o accessories

Accessories.............................................................. R/C, Batteries, AC Adapter, AC Cord,

LC-15A2M

AC 110-240V (AC Adapter)

(Rear) 2.5 W

(Rear) φ65 mm (1 pc)

(Rear) 6 ohm

Operation Manual, Cable Clamp

Specifications are subject to change without prior notice.

LC-15A2M

Operation Manual

Main unit (front view) Main unit (rear view)

Rear control panel

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

Remote sensor window

(The actual location is not visible)

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).

Antenna terminal

AUDIO (R) AUDIO (L)

VIDEO

S-VIDEO

COMPONENT

VIDEO AUDIO (L)

AUDIO (R)

Power input (DC 12 V)

Head phone

AV-IN 2 / OUTAV-IN 1

Remote control

POWER

TV/VIDEO

CHANNEL SELECT

POWER

TV/VIDEO

VOL

—

456

MPX

LCDTV

´/´´

DISPLAY

CH (')/(")

VOL

'Selects next higher channel

"Selects next lower channel

VOL (+)/(–)

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.

Dimensions

LC-15A2M

341.4

1.5

310.6

138.7

231.1

359.0

357.0

ø 205.0

339.2

307.4

45.3

30.3

1.5

114.5

156.4

50.0

46.4

26.0

1212121212

124.1

121.1

66.0

14.0 14.0 14.0 14.0 14.0 14.0 14.0 14.0 14.0 13.0 14.0

35.5

4.5

3.0

2.75

Units: mm

LC-15A2M

REMOVING OF MAJOR PARTS

1. Insert your finger into the center of the terminal cover and pull it toward you to detach the terminal cover.

2. Remove the four screws 1 and one screw 2.

3. Open the cabinet B by approx. 45˚ from the bottom of the cabinet (stand side).

4. Remove the lead wire from the cable clamp 3.

5. Remove the power connector 4.

6. Remove the connector 5 from the light reception unit.

7. Remove the lead wire from the cable clamp 6.

8. Remove the speaker connector 7.

9. Remove the FFC from the FFC connector 8 on the Main Unit.

10. Remove the connector 9 from the Operation Unit.

11. Remove the right and left speaker connectors 0 on the Terminal Unit.

<<Disassembly of the Main Unit>>

1. Disconnect the flexible cable connectors q and w from the LCD panel.

2. Disconnect the cable connectors e and r from the fluorescent lamp.

3. Remove the four screws t.

<<Disassembly of the Terminal Unit>>

1. Remove the cover u.

2. Remove the five screws y.

3. Remove the two screws i. Take them out of the cabinet holes.

<<Cabinet A side>>

Terminal Cover

Cabinet A

<<Cabinet B side>>

Cabinet B

LC-15A2M

» Caution for handling the LCD panel

1. Work in a clean room. (Humidity: 50% or more)

2. A worker must wear arm bands.

3. Work on a conductive mat.

4. Do not expose the unit to shock such as f all or vibration.

Reflection Panel

Light Guide Plate

<<Disassembly of LCD Panel>>

1. Remove the six LCD unit fixing screws.

2. Remove the shield case.

3. Remove the light guide panel holder.

4. Remove the reflection panel.

5. Remove the lamp unit.

6. Remove the light guide plate.

7. Remove the fixing angle.

8. Remove the ITO sheet, diffusion sheet and the reflection polarizing sheet.

Shield Case

Diffusion Sheet

ITO Sheet

Condenser Sheet

LCD Display Unit

Reflection Sheet

Fixing Angle

Reflection Polarizing Sheet

Light Guide Plate Holder

Lamp Unit (KLMP-0098CEZZ)

LC-15A2M

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.

1.Preparation for Adjustments

(1)Use the exclusive-use AC adapter or stable DC power supply.

AC adapter: UADP-0210CEZZ DC power supply: 12 ±0.5V

2.Special mode setting procedure

(1)After initialization of E2PROM the mode is changed to the adjustment mode.

[Procedure] Connect TP2001 and TP2002 to GND, and turn on the power.

[Description]

• The initialization of microprocessor is as follows.

• AV position, DAC data, G/A data, sound processor data and video chroma data adjustment values are taken as defaults.

(2)Adjustment mode

[Procedure] Make a short-circuit between TP2001 and GND, and turn on the power. Or make a short-circuit TP2002 to GND, and turn on the power. Or while holding down the [TV/VIDEO] and [MENU] keys at the same time, turn on the main power, and simultaneously press the (inspection process) [CH "] and [VOL– ] keys to change the mode to the adjustment mode.

[Description] The manual adjustment or adjustment through communication with the automatic machine is performed.

(3)Inspection mode

[Procedure] While holding down the [TV/VIDEO] and [MENU] keys at the same time, turn on the power.

[Description]

• In the ordinary menu select “VIDEO ADJUST” with the [CH] key, and decide with the [VOL] key. Then select “PICTURE”, “TINT (only NTSC)”, “COLOR”, “BLACK LEVEL”, “SHARPNESS”, “RED-BLUE”, “GREEN” and “COLOR SYSTEM” with the [CH] key, and decide with the [VOL] key. After that, adjust values with the [VOL] key.

• VOLUME, PICTURE, TINT (only NTSC), COLOR, BLACK LEVEL, SHARPNESS, RED-BLUE, GREEN change as follows.

ûMin.Û ûCenterÛ ûMax.Û

(4)Shipping setting mode

[Procedure] While holding down the [TV/VIDEO] and [MENU] keys at the same time, turn on the main power, and simultaneously press the (inspection process) [CH '] and [VOL+] keys to change the mode to the adjustment mode.

[Description] User adjustment and other values are taken as defaults. If TV is indicated as SETTING COMPLETE, setting has been completed.

3.Cancel of special mode

Turn off the main power.

4.Adjustments

Adjustment Adjusting conditions Adjusting method

LC-15A2M

1 B+ Adjustment

(If E

PROM is

replaced)(IC2004)

2 Model setup

(If E2PROM is replaced) (IC2004)

3 Counter-bias adjustment

1. Connect the DC voltmeter to pin 49 of SC401.

2. Go to the adjustment mode.

1. Go to the adjustment mode.

1. Receive a B/W channel.

2. Go to the adjustment mode.

3. Select the "COM BIAS" with [MENU] key.

1. Adjust the "B+ Adj" value to

5.0V ±0.02V with [VOL+] or [VOL-] Key.

* The colour of "B+ Adj" must be yellow.

1. Select "MODEL" with [MENU] key and adjust to "A2U" with [VOL+] or [VOL-] key.

* The colour of "MODEL" must be

yellow.

1. Adjust "COM BIAS" to the darkest creen with [VOL+] and [VOL-] key.

* The colour of "COM BIAS" must be

yellow.

5.Shipping setting list

Channel............................................................................................................................................... 1ch

Skip Data ............................................................................................................................................ Off

Volume................................................................................................................................................ 20

Contrast .............................................................................................................................................. 30

Tint ...................................................................................................................................................... 0

Colour ................................................................................................................................................. 0

Black Level ......................................................................................................................................... 0

SHARP................................................................................................................................................ 0

RED-BLUE.......................................................................................................................................... 0

GREEN ............................................................................................................................................... 0

TV Colour System............................................................................................................................... Auto

AV Colour System .............................................................................................................................. Auto

Language ............................................................................................................................................ English

Blue Screen (Back)............................................................................................................................. Off

Sleep Timer ........................................................................................................................................ None

NICAM ................................................................................................................................................ On

IGR...................................................................................................................................................... On

Brightness........................................................................................................................................... Bright

Auto Power Off ................................................................................................................................... Off

Upside................................................................................................................................................. Normal

Right/Left ............................................................................................................................................ Normal

AV1 ..................................................................................................................................................... Normal

AV2 IN/OUT........................................................................................................................................ In

LC-15A2M

No picture

at all

Yes

Are inputs

and outputs

of IC802 as

specified?

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

No picture

Check IC802

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 IC802

as specified?

Check IC802,

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

(1) 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 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”?

No VIDEO

2 output

Is input at pin

(74) of IC802

as specified?

Check J3409,

AV2 line and

their

peripheral

parts.

No S

VIDEO

output

Are inputs at

pins (71) and

(72) of IC802

as specified?

Check

SC3301, SY

line, SC line

and

peripheral

parts.

COMPONENT

output

Is input at

pins (4), (5),

(6) and (75)

of IC802 as

specified?

Check J3404,

J3405, J3406,

DVD-Y line,

CB line, CR

line and

peripheral

parts.

Are pins (65)

and (66) of

IC2001 both

at “L”?

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 F3702

function?

Check all the settings on the microprocessor

’s adjust process menu.

Are secondary outputs

(+38V, +16V, +9V, +5V, -8V)

of T701 as specified?

Yes

Are the oscillation waveform

at T701’s primary side as

specified?

Yes

Disconnect F3701 and

F3702. Is the load side

short-circuited?

Yes

Is any of T701’s primary side,

Q701, Q710 and S4701

short-circuited?

Check J3701, its peripheral

parts and connection cable.

Replace F3701 and F3702.

Check S4701 and

connection cable.

Check the secondary-side

load of T701.

Fluorescent lamp

Yes

Does F3751 function?

Yes

Is Pin (34) of IC1201 at

“H”?

Yes

Are the oscillation waveforms

at the primary side of T751

and T752 as specified?

Yes

Replace F3751.

Is input at pin (71) of IC802

as specified?

Check SC3301, SC line and

peripheral parts.

Yes

Check the line, IC1201 and

its peripheral parts.

Check Q751, Q752, T751,

T752, Q753 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

IC802 as specified?

Check J3404, J3405, CB line,

CR line and peripheral parts.

LC-15A2M

+ 23 hidden pages