Sharp LC-20SH21U - 20" LCD TV Bedienungsanleitung

LC-20SH21U

SERVICE MANUAL

LCD COLOR TELEVISION

MODEL LC-20SH21U

This document has been published to be used for after

sales service only.

The contents are subject to change without notice.

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.

SHARP CORPORATION

Page

1. Precautions and Safety Notices………………………….……………….…….2

2. Specifications………………….………………………….……………….….…..5

3. Servicing Environment………………………………….…………………....….6

4. Disassembly of Major Parts……….…….………………………..……….…....7

5. Wiring Diagram……………………..………………………….…………..……12

6. Block Diagram…………………….……………………………..………...…….13

7. Alignment Procedure For White Balance……….…………………..………...14

8. Firmware Upgrade Procedure ……….………………...……………………...22

9. Troubleshooting Analysis………….…………….…………….………….…....23

10. Exploded View……………………………………….………………………..…27

11.Part List………………………………………………………………….…..........29

Contents

LC-20SH21U

1. Precautions and Safety Notices

Prior to using this manual, please ensure that you have carefully followed all the

procedures outlined in the user manual for this product.

lRead all of these instructions.

lSave this instructions for later use

lFollow all warnings and instructions marked on the product.

lDo not use this product near water.

lThis display should be installed on a solid horizontal base.

lWhen cleaning, use only a neutral detergent cleaner with a soft damp cloth. Do not spray with

liquid aerosol cleaners.

lDo not expose this display to direct sunlight or heat. Hot air may cause damage to the cabinet

and other parts.

lAdequate ventilation must be maintained to ensure reliable and continued operation and to

protect the display from overheating. Do not block ventilation slots and openings with objects

or install the display in a place where ventilation may be hindered.

lDo not allow metal pieces or objects of any kind fall into the display from ventilation holes.

Slots and openings in cabinet and the back or bottom are provided for ventilation. To ensure

reliable operation of the product and to protect it from overheating, these openings must not be

blocked or covered. The openings should never be blocked by placing the product on a bed, sofa,

rug, or other similar surface. This product should not be placed near or over a radiator or heat

LC-20SH21U

Safety Guidelines

CAUTION: The power supply outlet should be located near the HD TV and should be easily

accessible. Always use the appropriate AC cord that is certified for your specific country. Some

examples are listed below:

USA..................UL Switzerland ..... SEV

Canada.............CSA Britain ............. BASE/BS

Germany..........VDE Japan ............... Electric Appliance Control Act

IMPORTANT NOTICE CONCERNING POWER CORD SELECTION

The specific power cord for this HD TV is enclosed and has been selected according to the country

of destination and must be used to prevent electric shock. Use the following guidelines if it is

necessary to replace the original cord set, or if the cord set is not enclosed. The female receptacle

of the cord set must meet IEC-60320 requirements and should look like Figure A1 below:

Figure A1 Figure A2

For the United States and Canada

In the United States and Canada the male plug is a NEMA5-15 style (Figure A2), UL Listed, and

CSA Labeled. For LCD TVs that are placed on a desk or table, type SVT or SJT cord sets may be

used. For LCD TVs placed directly on the floor, only SJT type cord sets may be used. The cord set

must be selected according to the current rating for the LCD TV. Please consult the table below for

the selection criteria for power cords used in the United States and Canada.

Cord Type Size of Conductors in Cord

Maximum Current Rating of Unit

SJT 18 AWG

16 AWG

14 AWG

10 Amps

12 Amps

SVT 18 AWG

17 AWG 10 Amps

12 Amps

LC-20SH21U

FCC Compliance Statement

This equipment has been tested and complies with the limits for a Class B digital device, pursuant

to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against

harmful interference in a residential installation. This equipment generates, uses, and can radiate

radio frequency energy, and may cause harmful interference to radio communications if not

installed and used in accordance with the instructions. However, there is no guarantee that

interference will not occur in a particular installation. If this equipment does cause harmful

interference to radio or television reception, which can be determined by turning the equipment off

and on, the user is encouraged to try to correct the interference by one or more of the following

measures:

•Reorient or relocate the receiving antenna.

•Increase the separation between the LCD TV and receiver.

•Connect the equipment into an outlet on a circuit different from that to which the receiver is

connected.

•Consult the SHARP Service Center or an experienced radio/TV technician for assistance.

FCC Warning

To assure continued FCC compliance, the user must use a grounded power supply cord and the

provided shielded video interface cable with bonded ferrite cores. If a BNC cable is used, use only

a shielded BNC (5) cable. Also, any unauthorized changes or modifications not expressly

approved by SHARP CORPORATION will void the user's authority to operate this device.

LC-20SH21U

2. Specifications

Model Name LC-20SH21U

Panel Type 20" (20" viewable diagonal area), TFT (Thin Film Transistor),

TN model, 1366x 768 Normally White

Viewing Angles 160° (H) / 140° (V)

Input Signal Video/Audio VGAAnalog * 1 (75 ohms, 0.7 Vp-p)/Mini-Stereo *1

H/V separated (TTL) for PC; fh: 30-48 kHz, fv: 50-75 Hz

HDMI-HDCP *1 / RCA (L/R) stereo *1

TV system antenna / NTSC & ATSC *1 in USA(F type)

YPbPr *1/ RCA (L/R) Stereo *1

AV2 * 1 /RCA (L/R) Stereo *1

Composite * 1 / S–Video *1 / RCA (L/R) stereo * 1

Output Signal RCA (L/R) Stereo * 1;SPDIF (PCM/RAW) *1

HDTV Compatibility 480i, 480P, 720P, 1080i

Video Engine The best TVs use the best technology: ATI inside your TV for The Ultimate Visual

Experience.™ Your new Sharp TV is powered by ATI’s Xilleon™ image processing chip

for the true high definition cinematic experience. Enjoy your new Sharp TV with ATI inside.

PC Compatible Recommended 1360x 768@60Hz(reduce blanking)

1280 x 720@60Hz 720 x 400

1024 x 768@60Hz 640 x 480

H = 30~48KHz V= 50~75 Hz

Speaker Output 2.5w (x2 Channels)

Power Voltage 120VAC, 60 Hz, 1.5A

Temperature Operating 0 to + 35° C (Hum. <90%)

(Note A) Storage -20 to+60oC(Hum.< 35%)

Humidity (Relative) Operating 20 to 90% non-condensing. (Ta< 35%)

(Note A) Storage 10 to 90% non-condensing. (NoteA)

Wet-bulb temperature should be 39oCMax. (Ta> 40oC)

Note A: The temperature and relative humidity range is shown in right side

Altitude Operating 0 to 3,000 m

Storage 0 to 12,000m

Dimensions Physical 509mm (W) x 408 mm (H) x203 mm (D)

Weight Net / Gross 6.4 kg / 8.3 kg

Regulations UL/C-UL, FCC-B, UL(UL60065) / C-UL,ICES-003,BETS-T

Consumption

(DC Power)

DC OFF

Powersaving

70w(Blue LED)

0.5w(LED off)

14w(Amber LED)

Preset Timing Mode:

Selects timing mode at 1360 x 768 / 60 Hz (reduce blanking) or recommended timing, when you set the graphics card

in your computer.

Note: Product Specifications are subject to change without notice.

LC-20SH21U

3. Servicing Environment

1. This LCD TV should be used only with the power source type identified on the package and

User’s Guide

2. Service the LCD TV in a room with low humidity and free of dust.

3. Place the LCD TV on a firm, level surface. Subjecting the LCD TV to a drop or sharp impact

may cause severe damage to thin glass, plastic surface materials, and internal components.

4. If necessary, clean the LCD TV with a slightly damp cloth using clean water.

Disconnect the LCD TV from the power source before cleaning. DO NOT use ammonia-based

cleaning products.

5. In the event that the powered LCD rapidly heats, or emits unusual smells or noises,

immediately disconnect the LCD TV From the power source.

6. To avoid electrical hazard, make sure that the LCD TV is fully assembly the casing closed, and

the screws tightened completely before plugging in LCD TV for testing.

7. Internal components of LCD display may be damaged by electrostatic discharge(ESD). Carry

out repairs in an ESD-protected workshop. If no such workshop is available, wear an

antistatic wrist strap or touch a highly conductive metal object.

8. Before opening the housing, disconnect the product from all power source and remove any

connecting cable. If the display has not been disconnected from the power outlet before being

opened, there is a danger to life through electric shock. These is also a risk of damage to the

components

LC-20SH21U

4. Disassembly of Major Parts

1. Remove the cover hinge.

2. Remove the stand fixing screws (5 pcs ).

3. Remove the Cabinet fixing screws (7 pcs).

4. After opening the Cabinet, remove the cable tie first.

LC-20SH21U

5. Disconnect the Panel FFC cable connector.

6. Disconnect all the connectors fromthe PWB’s of Cabinet module.

LC-20SH21U

7. Remove the Inverter PWB fixing screws (4 pcs).

8. Remove the Power PWB fixing screws (4 pcs).

9. Remove the Shield can module fixing screws (6 pcs), then take outthe

shield can module.

10. Remove the Left side IO fixing screws (5 pcs).

11. Remove the Bracket IO fixing screws (4 pcs).

LC-20SH21U

12. Remove the Right side IO fixing screws (4 pcs).

13. Remove the Main PWB fixing screws (4 pcs).

14. Disconnect all the connectors fromthe PWB’s of Bezel module.

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