SHARP LC-10A3E Service Manual

SERVICE MANUAL LCD COLOUR TELEVISION

LC-10A3E

TENTATIVE

SERVICE MANUAL

S51T1LC-10A3H

LCD COLOUR TELEVISION

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.

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

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

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

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

» DISASSEMBLY OF THE SET............................................................................................................... 6

» ADJUSTING PROCEDURE OF EACH SECTION ............................................................................... 9

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

» CHASSIS LAYOUT ............................................................................................................................. 16

MODEL LC-10A3E

» BLOCK DIAGRAM.............................................................................................................................. 18

» DESCRIPTION OF SCHEMATIC DIAGRAM ..................................................................................... 19

» SCHEMATIC DIAGRAM ..................................................................................................................... 20

» PRINTED WIRING BOARD ASSEMBLIES........................................................................................ 27

» PARTS LIST

» PACKING OF THE SET ...................................................................................................................... 40

MODEL

LC-10A3E

CONTENTS

ELECTRICAL PARTS..................................................................................................................... 31

MAIN UNIT ..................................................................................................................................... 31

TERMINAL UNIT............................................................................................................................ 35

OPERATION UNIT ......................................................................................................................... 36

LED UNIT ....................................................................................................................................... 37

ACCESSORIES PARTS ................................................................................................................. 37

PACKING PA RTS ........................................................................................................................... 37

CABINET PARTS LOCATION ........................................................................................................ 38

CABINET AND MECHANICAL PARTS.......................................................................................... 39

Page

SHARP CORPORATION

LC-10A3E

12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212

IMPORTANT SERVICE SAFETY PRECAUTION

Service work should be perfomed only by qualified service technicians who are thoroughly 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 ser vicing.

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 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 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

50k ohms.

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

LCD panel...............................................................................................10.4" TFT LCD

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

Video colour systems.......................................................................PAL/NTSC/SECAM

TV FUNCTION

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

TV Tuning System.......................................................................Auto preset 100 ch.

STEREO/BILINGUAL ............................................................................ NICAM, IGR

AUTO PRESET...................................................................................................YES

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

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

Luminance ......................................................................................................400 cd/m

Lamp life ................................................................................................... 60,000 Hours

Viewing angles................................................................................................... H : 120°

Audio amplifier .................................................................................................1.0 W × 2

Speakers................................................................................................ 3 × 4 cm, 2 pcs

Terminals

AV1 .......................................................................................... AV-IN 1, S-VIDEO-IN

AV2 ................................................................................................................AV-IN 2

AV OUT .........................................................................................................AV-OUT

ANT......................................................................................................................DIN

H/P ...........................................................................................3.5 mm ø jack (Rear)

OSD Language .......................English/German/Dutch/French/Italian/Spanish/Swedish

Power supply.............................................................. DC 12 V, AC110-240 V, 50/60 Hz

Weight........................................................................................ 1.9 kg w/o accessories

Accessories ............................ R/C, Batteries, Wall mount parts, AC adaptor, AC cord,

........................................... AV cable for mini-jack

LC-10A3E

V : 100°

Design and specifications are subject to change without notice.

LC-10A3E

Operation Manual

Main unit (front view)

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 power is off).

Main unit (rear view)

Top control panel

BRIGHT

Ë

The MUTE, DISPLAY, MENU, Volume (+)/(–), CH (')/("), and TV/VIDEO buttons provide the same functions as the buttons on the remote control. (The MENU button has a slightly different function from the remote control button.)

DISPLAY

MUTE

Volume (+)/(–)

TV/VIDEO

CH (')/(")

Adjust the set stand to an angle so that the screen is easily visible. The set stand can be opened up to 80°.

MAIN POWER

Remote control

(POWER)

TV/VIDEO

CHANNEL SELECT

TV/VIDEO

VOL

–

123 456

LCDTV

Rear terminal section

AV input 1 terminal

• S-Video input

AUDIO

HEADPHONE

POWER

CH (')/("), Cursor control Up/Down

VOL

Selects next higher channel

Selects next lower channel

VOL (+)/( ), Cursor control Right/Left 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.

SOUND MODE SELECTOR

Switching audio mode.

INPUT

DC12V

• Video input

• Audio R/L

AV-IN1

AV-IN2

AV input 2 terminal

AV-OUT

AV output terminal Headphone output

terminal

DC input terminal

Antenna input terminal

Dimensions

LC-10A3E

Front View

267

213.2

193

Side View

63.5

47.5

43.5

81.279.2

107.8

123

126.5 105.5

49.5 65

Rear View

88.5

72 12.5 14 14 14 15

90.1

15.5 103

30.5

177

243.8

(Units: mm)

LC-10A3E

1. Remove the five lock screws (1) off the cabinet B.

2. Push on the six hooks (2) of the cabinet B and open it slightly.

3. Disconnect all the connectors (3) from the terminal and operation PWBs. Detach the cabinet B.

4. Disconnect all the connectors (4) from the main PWB.

DISASSEMBLY OF THE SET

Cabinet B

P3203

P3204

P701

P2001

SC401

P301

P2001

(Main PWB)

P752

P401 SC1201

P701

P2002

P751

SC1203

Cabinet A

5. Remove the four lock screws (5) off the main PWB.

6. Peel off the one piece of tape (6) and detach the LC display unit.

7. Remove the two lock screws (7) off the remote control PWB.

8. Remove the four lock screws (8) off the terminal PWB.

9. Remove the two lock screws (9) off the operation PWB.

10.Remove the two lock screws (10) off the flexible shield.

LC-10A3E

Main PWB

LC display unit

Cabinet A

Terminal PWB

Operation PWB

LED PWB

LC display unit

(rear view)

Cabinet B

Flexible shield

LC-10A3E

11.Undo the seven hooks (11) to release the unit frame.

12.Detach the fluorescent lamp (12).

Panel holder

LC-10A3E

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-0225CEPZ DC power supply: 12 ± 0.5V

2.Special mode setting procedure

(1)Adjustment mode

[Procedure]

• Short-circuit TP2001 to GND, and turn on the power.

• Or short-circuit TP2002 to GND, and turn on the power.

• Or holding down the [TV/VIDEO] key and [MENU] key, turn on the main power, and simultaneously press the (inspection process) [CH "] key and [VOL– ] key to change the mode to the adjustment mode.

• Each adjustment item is chosen with the [MENU] key, and adjusted with the [VOL] key.

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

(2)Inspection mode

[Procedure] Holding down the [TV/VIDEO] key and [MENU] key, turn on the power. [MENU] key is pushed and made inspection mode.

[Description]

• In the ordinary menu select with the [CH] key, and decide with the [VOL] key. Then select “PICTURE”, “TINT (only

NTSC)”, “COLOUR”, “BLACK LEVEL”, “SHARPNESS”, “RED-BLUE”, “GREEN” and “COLOUR SYSTEM” with the [CH] key, and decide with the [VOL] key. After that, adjust values with the [VOL] key.

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

follows.

(3)Shipping setting mode

[Procedure] Holding down the [TV/VIDEO] key and [MENU] key, turn on the main power, and simultaneously press the (inspection process) [CH '] key and [VOL+] key to change the mode to the shipping setting mode.

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

ûMin.Û ûCenterÛ ûMax.Û

3.Cancel of special mode

Turn off the main unit power.

4.Initialization

Here is the procedure of initializing the EEPROM and making model number and size settings.

4-1. Get Pins (81) and (82) of the IC2001 (microprocessor) grounded and turn on the power. 4-2. Select a model number (A1, A2H, A2U, A3E). For Model LC-10A3E select A3E. 4-3. Select a size in inches (10, 12, 15, 20). For Model LC-10A3E select 10. 4-4. Get Pins (81) and (82) of the IC2001 (microprocessor) back to normal.

LC-10A3E

5.Reset of lamp error

6.Adjustments

If the power LED remains red and the power is not turned on, or if repair has been perf ormed, enter the adjustment

mode to reset the lamp error. For the resetting procedure, refer to " No power" in the "Trouble shooting Table" section.t remote controller:

6-1. +B adjustment

V ary the “+B-ADJ” setting on Page 1 of the adjustment process so that the voltage at pin 49 of SC401 be 5.00 ±0.02 V. Note : Adjust precisely to 5.0 V because this level will be used as supply voltage reference.

6-2. Counter-bias adjustment

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 114 for Model LC-10A3E.

6-3. TAMP adjustment

1) Receive the colour bar signal.

2) See if the "Y" reading on page 2 of the adjustment process is somewhere between BO and BA. If not, make the "PAL TAMP" adjustment to get the "Y" reading in the range of BO thru BA.

(Adjustment process menu on-screen display on page 2)

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

2 1 2 3 4 5 6

7 8

10 11

12 13

COM BIAS 117 PAL 27TAMP TV H- PEAK ING 3 RCUTOFF 0

GCUTOFF 0 BCUTOFF –1

TA PMH AB TAMP L B0

G3 B3 R3 00 00 00 G1 B4 Y 00 00 B5

Y Data (75% white )

6-4. White balance adjustment

Vary the “RCUTOFF” and “BCUTOFF” settings to achieve optimum white balance. Note : For the “RCUTOFF” and “BCUTOFF” settings, keep the readings in the range of -10 to +10. If out of

this range, the user-adjustable range is reduced.

7.OSD Menu (for pages 1 and 2)

LC-10A3E

Page Item MIN MAX Remarks

1 +B-ADJ 0 255 160 Refer to 5-1

MODEL A3E Refer to 4-2

INCH SIZE 10 Refer to 4-3

TIMER 1

SYSTEM PAL

NTSC PWM FREQ 000 FFF 0C0

PAL PWM FREQ 000 FFF 0BD

TV GAIN OFF

ERROR NO RESET 0

PMUTE 00

2 COMBIAS 0 255 117 Refer to 5-2

PAL TAMP 0 63 27

TV H-PEAKING 0 63 27

R CUT OFF 0 7 0 Refer to 5-3 (around -5)

Initial

Setting

G CUT OFF -15 +15 0

B CUT OFF -15 +15 -1 Refer to 5-3

TAMP H 00 FF BA

TAMP L 00 FF B0

G3 -15 +15 0

B3 00 FF 00

R3 00 FF 00

G1 00 FF 00

B4 00 FF 00

Y00FF00

LC-10A3E

TROUBLE SHOOTING TABLE

No Power (Power LED indicator still in red)

Go to the adjustment process mode.

+B-ADJ 160 MODEL A3E INCH SIZE 10 TIMER 1 NTSC PWM FREQ OCO PAL PWM FREQ OBD TV GAIN OFF ERROR NO RESET 5 PMUTE 00

Move the cursor to ERROR NO RESET and click on it (to reset to zero).

Turn off the power.

Is the power turned on again?

Check the back light lamp, D753, D754, Q757, Q3600-2 and their peripheral parts as well as pin (42) of IC2001.

Note:

This model is equipped with the lamp error detection function that detects the current flowing into the fluorescent lamp and protects the backlight lamp drive circuit. If a lamp error is detected, the microprocessor interrupts the unit and the ERROR NO RESET setting will go up. When the ERROR NO RESET setting has reached "5", the microprocessor turns and keeps off the unit's power. To resume the power, take the above procedure to clear the ERROR NO RESET setting.

+ 26 hidden pages