ViewSonic VS10769-1G service manual

Service Manual

ViewSonic N3250w-G-1

Model No. VS10769-1G

32” LCD TV Display

ViewSonic

(N3250w-G_SM Rev. 1a Jan. 2006)

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381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583

reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any language or computer language, in any form or by any means, electronic, mechanical, magnetic, optical, chemical, manual or otherwise, without the prior written permission of ViewSonic Corporation.

Disclaimer

ViewSonic makes no representations or warranties, either expressed or implied, with respect to the contents hereof and specifically disclaims any warranty of merchantability or fitness for any particular purpose. Further, ViewSonic reserves the right to revise this publication and to make changes from time to time in the contents hereof without obligation of ViewSonic to notify any person of such revision or changes.

Trademarks

Optiquest is a registered trademark of ViewSonic Corporation. ViewSonic is a registered trademark of ViewSonic Corporation. All other trademarks used within this document are the property of their respective owners.

01/03

/06

Revision History

Documents Number

DCN Number ECR Number

5805

Description of Changes EditorRevision SM Editing Date

Initial Release

A. Lu

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TABLE OF CONTENTS

1. Precautions and Safety Notices

2. Service Tool & Equipment Required

3. Specification

4. Adjustment Procedure

5. Packing For Shipping And Disassembly Procedure

6. Troubleshooting Flow Chart

7. Exploded View

8. Recommended Spare Parts List

9. Block Diagram

10. Schematic Diagrams

11. Working

Theorem

12. Wiring Diagram

13. PCB Layout Diagrams

4 4

39 41

48 49 60

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1. Precautions and Safety Notices

1.1. SAFETY PRECAUTIONS

This LCD TV is manufactured and tested on a ground principle that a user's safety comes first. However, improper use or installation may cause damage to the LCD TV as well as to the user. Carefully go over the following WARNINGS before installing and keep this guide handy.

WARNINGS:

This LCD TV should be operated only at the correct power sources indicated on the label

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on the rear end of the LCD TV. If you're unsure of the power supply in your residence, consult your local dealer or power company. Use only the special power adapter that comes with this LCD TV for power input.

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Do not try to repair the LCD TV yourself as it contains no user-serviceable parts. This

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LCDTV should only be repaired by a qualified technician. Do not remove the LCD TV cabinet. There is high-voltage parts inside that may cause

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electric shock to human bodies, even when the power cord is unplugged. Stop using the LCD TV if the cabinet is damaged. Have it checked by a service technacian.

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Put your LCD TV only in a clean, dry environment. If it gets wet, unplug the power cable

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immediately and consult your service technician. Always unplug the LCD TV before cleaning it. Clean the cabinet with a clean, dry cloth.

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Apply non-ammonia based cleaner onto the cloth, not directly onto the glass screen. Keep the LCD TV away from magnetic objects, motors, TV sets, and transformer.

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Do not place heavy objects on the LCD TV or power cord.

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1.2. PRODUCT SAFETY NOTICE

Many electrical and mechanical parts in this chassis have special safety visual inspections and the protection afforded by them cannot necessarily be obtained by using replacement components rated for higher voltages, wattage, etc. Before replacing any of these components read the parts list in this manual carefully. The use of substitute replacement parts which do not have the same safety characteristics as specified in the parts list may create shock, fire, or other hazards.

1.3. SERVICE NOTES

1. When replacing parts or circuit boards, clamp the lead wires around terminals before soldering.

2. When replacing a high wattage resistor (more than 1W of metal oxide film resistor) in circuit board, keep the resistor about 5mm away from circuit board.

3. Keep wires away from high voltage, high temperature components and sharp edges.

4. Keep wires in their original position so as to reduce interference.

5. Usage of this product please refer to also user's manual.

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LCD TV Handling Precautions

1. Handling Precautions

(1) Since front polarizer is easily damaged, pay attention not to scratch it. (2) Be sure to turn off power supply when inserting or disconnecting from input connector. (3) Wipe off water drop immediately. Long contact with water may cause discoloration or spots. (4) When the panel surface is soiled, wipe it with absorbent cotton or other soft cloth. (5) Since the panel is made of glass, it may break or crack if dropped or bumped on hard surface. (6) Since CMOS LSI is used in this module, take care of static electricity and insure human earth

when handling. (7) Do not open nor modify the Module Assembly. (8) Do not press the reflector sheet at the back of the module to any directions. (9) In case if a Module has to be put back into the packing container slot after on ce it was taken

out from the container, do not press the center of the CCFL Reflector edge. Instead, press at

the far ends of the CFL Reflector edge softly. Otherwise the TFT Module may be damaged. (10) At the insertion or removal of the Signal Interface Connector, be sure not to rotate nor tilt the

Interface Connector of the TFT Module. (11) After installation of the TFT Module into an enclosure (LCD TV housing, for example), do

not twist nor bend the TFT Module even momentary. At designing the enclosure, it should be

taken into consideration that no bending/twisting forces are applied to the TFT Module from

outside. Otherwise the TFT Module may be damaged. (12) Cold cathode fluorescent lamp in LCD contains a small amount of mercury. Please follow

local ordinances or regulations for disposal. (13) Small amount of materials having no flammability grade is used in the LCD module. The

LCD module should be supplied by power complied with requirements of Limited Power

Source (IEC60950 or UL1950), or be applied exemption. (14) The LCD module is designed so that the CFL in it is supplied by Limited Current Circuit

(IEC60950 or UL1950). Do not connect the CFL in Hazardous Voltage Circuit.

2. Handling and Placing Methods

Correct Methods: Incorrect Methods:

Only touch the metal frame of the LCD panel or the front cover of the LCD TV. Do not touch the surface of the polarizer.

Surface of the LCD panel is pressed by fingers and that may cause “Mura”

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Take out the LCD TV with cushions Taking out the LCD TV by grasping the LCD

panel. That may cause “Mura”

Place the LCD TV on a clean and soft foam pad.

Placing the LCD TV on foreign objects. That could scratch the surface of the panel or cause “Mura”

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2. Service Tool & Equipment Required

1. SIGNAL GEN.

2. MULTIMETER

3. OSCILLOSCOPE

4. SCREW DRIVER

5. IRON

6. ABSORBER

7. SOLDER

8. DUMMY LOAD (5A/200W)

9. DVD PLAYER

3. SPECIFICATIONS

3.1. PRODUCT SPECIFICATIONS

LCD Panel 32" TFT

Power Management < 5W (OFF MODE)

Displayable Resolution VESA 1280×1024 max.

Pixel Dimension 0.51075(H)×0.5107 (W)mm

LCD Display Color 16.7M Color Max. (8bit/color)

Viewing Angle CR Horizontal: -85°+85° Vertical: -85°+85°

Contrast Ratio 800 : 1 (typical)

Brightness 500 cd/m

Response Time Tr: 8 ms , Tf: 8ms (typical)

Active Display Area 679.68mm×392.26mm

RF Tuner Input level: 0 ~ +15 dB mV Rang: NTSC 55.25 to 801.25 MHz, 2-69 channels for Off-Air and 2-125 Channeis for CATV

Power Voltage: 100~240 V Consumption: 200 Watts (Max.)

Speaker 10W×2

Compliance FCC,UL

Temperature Operating : 0°C~ +40°C Storage : -20°C~+60°C

≥

(typical)

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3.2. FACTORY SUPPORTING

MODES

ITEM 1 2 3 4

TIMING 640×480 60HZ 640×480 75HZ 800×600 60HZ 800×600 75HZ Pixel Rate 25.175MHZ 31.500MHZ 40.000MHZ 49.500MHZ H TOTAL 31.778us 26.667us 26.400us 21.333us H DISPLAY 25.422us 20.317us 20.000us 16.162us H B-Porch 1.907us 3.810us 2.200us 3.232us H Width 3.813us 2.032us 3.200us 1.616us H Border 0.318us 0.000us 0.000us 0.000us V TOTAL 16.683ms 13.334ms 16.579ms 13.333ms V DISPLAY 15.253ms 12.800ms 15.840ms 12.800ms V B-Porch 1.049ms 0.427ms 0.607ms 0.448ms Vs Width 0.064ms 0.080ms 0.106ms 0.064ms V Border 0.254ms 0.000ms 0.000ms 0.000ms H/V Sync -/- -/- +/+ +/+ Interlace No. No. No. No.

ITEM 5 6 7 8

TIMING 1024×768 60HZ 1024×768 75HZ 1280×720 60HZ 1280×768 60HZ Pixel Rate 65.000MHZ 78.750MHZ 74.250MHZ 65.000MHZ H TOTAL 20.677us 16.660us 22.222us 20.677us H DISPLAY 15.754us 13.003us 17.239us 15.754us H B-Porch 2.462us 2.235us 2.936us 2.462us H Width 2.092us 1.219us 1.007us 2.092us H Border 0.000us 0.000us 0.000us 0.000us V TOTAL 16.666ms 13.328ms 16.667ms 16.666ms V DISPLAY 15.880ms 12.795ms 16.000ms 15.880ms V B-Porch 0.600ms 0.466ms 0.444ms 0.600ms Vs Width 0.124ms 0.050ms 0.111ms 0.124ms V Border 0.000ms 0.000ms 0.000ms 0.000ms H/V Sync -/- +/+ -/- -/Interlace No. No. No. No.

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ITEM 9 10 11 12

TIMING Pixel Rate H TOTAL H DISPLAY H B-Porch H Width H Border V TOTAL V DISPLAY V B-Porch Vs Width V Border H/V Sync Interlace

3.3. D-SUB & DVI CONNECTOR

Connector pin assignments for VGA cable

The signal cable connector shall be a molded-over, shield twisted pair cable. The cable shall be

1.8 meters long. The pin assignments shall be listed as below:

1360×768 60HZ 1280×1024 60HZ

85.5MHZ 108MHZ

20.959us 15.630us

15.906us 11.852us

2.994us 2.296us

1.310us 1.037us

0.000us 0.000us

16.662ms 16.661ms

16.097ms 16.005ms

0.377ms 0.594ms

0.126ms 0.047ms

0.00ms 0.00ms +/+ +/+

No. No.

PIN D-SUB Connector

1 Red Video 2 Green Video 3 Blue Video 4 NC 5 GND 6 GNC 7 GND 8 GND

9 +5V for DDC 10 GND 11 NC 12 SDA 13 H-sync 14 V-sync 15 SCL

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Connector pin assignments for DVI cable DVI: 25 pins DVI connector is designed to match with DVI digital signal cable, the pin assignment is as the following:

* 25 pins DVI female

Pin Signal Assignment Pin Signal Assignment Pin Signal Assignment

1 TMDS RX2- 9 TMDS RX1- 17 TMDS RX02 TMDS RX2+ 10 TMDS RX1+ 18 TMDS RX0+ 3 TMDS Ground 11 TMDS Ground 19 TMDS Ground 4 Floating 12 Floating 20 Floating 5 Floating 13 Floating 21 Floating 6 DDC Clock 14 +5V Power 22 TMDS Ground 7 DDC Data 15 Ground 23 TMDS Clock+ 8 Floating 16 Hot Plug Detect 24 TMDS Clock-

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4. Adjustment Procedure

4.1. ADJUSTMENT CONDITIONS AND PRECAUTIONS

1. Approximately 30 minutes should be allowed for warm up before proceeding.

2. Adjustments should be undertaken only on those necessary elements since most of them have been carefully preset at the factory.

3. ESD protection is needed before adjustment.

4.2. MAIN ADJUSTMENTS

NO. FUNCTION DESIGNATION

1. EEPROM Initial Function Key

2. White Balance Function Key

4.3. ALIGNMENT PROCEDURES

Adjustment Conditions and Precautions:

(A). Power supply voltage:

AC 110/120V±10% 60 Hz±5%, AC 220/240V±10% 50 Hz±5%.

(B). Warm up time:

The display must be power ON for at least 30 minutes at full white pattern before starting alignments. This is especially critical in color temperature and white balance adjustments.

(C). Signals: reference the front detail specifications and timing table.

Video : reference the front detail specifications.

1. EEPROM Initial:

A. Timing : 1024x768@60Hz. B. Pattern : Cross hatch. C. Switch off the power and press the “▲” and “enter “ key simultaneously, and switch

on the power. At this time we can enter into the factory mode.

D. Select the “EEPROM INIT” item and press “enter“key to reset the EEPROM.

2. White Balance Adjustment :

A. Timing : 1024x768@60Hz. B. Pattern : 16 gray. C. Set CA110 color analizer at the center of screen and along a perpendicular to the

screen at 20cm from the display. D. Press menu key select the OSD page on INPUT SELECT and select MAIN:VGA. E. Press menu key change the OSD page to adjust page. F. Press “▼” key to select the “ WHITE BALANCE” item in the factory mode and

press “enter “key, then the white balance will be auto dadjusted . G. Color temperature verification :

Warm /SRGB x=0.313±0.03 y=0.329±0.03 USER x=0.283±0.03 y=0.298±0.03 COOL x=0.271±0.03 y=0.278±0.03

Y≥380 cd/m

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4-4 Adjusting Procedure

1. Function Test

1.1. Product

- 32” LCD TV

1.2. Test Equipment

-PC signal generator: CHROMA 2130,2135,2325,2326 or 2525.

-TV, Video signal generator: SHIBASOKU TG91CC.

-AV, S-Video, HD, and SCART signal generator: DVD.

-Color analyzer: MINOLTA CA110.

-Power meter: CP-310A or CP-320A.

1.3. Test Condition

Before function test and alignment, each LCD TV should be run-in and warmed up for at least 30 minutes with the following conditions: (a) In room temperature, (b) With full-white screen, and 16 grey scale, (c) With cycled display modes.

1.4. Test Display Modes & Pattern

1.4.1 EEPROM INIT A. Timing: 1366*768@60Hz B. Pattern: 16*12 pane C. Press ’POWER’, ‘▲’and ‘ENTER’ at the same time, then go into the FACTORY

MODE.

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Fig.1 Fig.2

D. Figure 1,press ENTER, and the Fig. 2 come out. The act of EEPROM INITIAL is

completed when EEPROM INIT disappeared. And remove OSD to WHITE BALANCE.

1.4.2 COLOR TEMPERATURE ADJUSTING PC MODE:

A. Timing: 1280*1024@75Hz. B. Pattern: 16 grey scale and full white. C. LCD TV should be run-in and warmed up for at least 30 minutes. D. Make sure the distance between SENOR of the CA110 and the LCD TV is about

20cm.

E. Color Temperature adjusting.

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Fig. 3 Fig. 4

1. Fig. 3: under the picture of 16 grey scale, select WHITE BALANCE and press ENTER, The color warm will auto adjust, the same as Fig. 4. The act of EHITE BALANCEL is completed when EHITE BALANCEL disappeared.

2. After adjusting, switch to FULL WHITE and check the value of each color. Preset color for N3250W(G) USER----9300 x=0.285±0.015 y=0.293±0.015 Warm SRGB----6500 x=0.313±0.015 y=0.329±0.015 COOL----12000 x=0.271±0.015 y=0.278±0.015

HD MODE:

A. Timing: PAL OR NTSC. B. Pattern: Color bar

1. Figure 3: under the picture of color bar , select WHITE BALANCE and press ENTER, The color warm will auto adjust, the same as Figure 4. The act of EHITE BALANCEL is completed when EHITE BALANCEL disappeared.

2. Normal----9300 x=0.285±0.015 y=0.293±0.015 Warm ----6500 x=0.313±0.015 y=0.329±0.015 COOL----12000 x=0.271±0.015 y=0.278±0.015

1.4.3.Check the position of the picture displayed and phase auto adjusting. A. Under TV Mode, check the picture of GREY, if there are some white point flashes or

blue point, please adjusts DDR-ADJUST to normal state.

B. Depend on the TIMING of TIMING TABLE (Engineer Spec. ) to switch MODE in

order, stay about 10 seconds each MODE, it can changed and stored automatically each MODE. We can’t switch over to the next MODE until AUTO ADJUST disappears.

C. Need confirm after adjusting, each MODE really change and store.

1.4.4.POWER SAVING TEST: A. Timing: 640*480@75Hz. B. Pattern: TEST-TTL/ECL. C. BRIGHTNESS=MAX, CONTRAST=MAX. D. The power that each MODE consumes is shown in Chart 1.

MODE

NORMAL Standby OFF

MAX POWER CONSUMED POWER LED COLOR

<200W GREEN

<5W ORANGE <5W RED

Chart 1

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1.4.5 OSD FUNCTION TEST: A. Timing: 640*480 @75Hz. B. Pattern: “GENERAL-1”. C. Make sure that Each FUNCTION have one right action. D. After adjusting and confirming no error, we can take delivery of goods until it set as

default.

1.4.6 Under PC MODE, input PC AUDIO signal, determines whether the action of AUDIO IN is right. Meets earphone with the EARPHONE, Determined whether the action of AUDIO OUT is normal.

CHANNEL

ORDER

P5 P6

Sound modulation: standard.

2. Stereo content setting: Left sound track 3KHz; Right sound track 1KHz.

FREQUENCE

(MHz)

45.75 PAL I Mono Scope FM Mono

55.75 SECAM L Color Bar Nicam

160.00 SECAM L Mono scope FM Mono*1

440.25 PAL D/K Full White

471.25 PAL B/G Dem Nicam

567.25 PAL I Multi-Burst Nicam Dual -10 Dual Function

855.25 PALB/G Color Bar Nicam

863.25 PAL D/K Mono Scope FM Mono*1

Note: 1. Sound working pattern: Int Osc 400Hz;

1.4.7.TV RECEIVING TEST: P0. Examines sound by ear, whether the sound does have mechanical resonation and the

electrical unusual sound, and image to sound disturbance.

P1. Examines whether the sound does receive the image disturbance, Judgment basis:

Whether there is unusual sound, input signal LEVEL<=36dBu,and STEREO SENSITIVITY is normal.

P2. Adjustment attenuator, If the critical point of the change of the image signal to noise

ratio is under LEVEL<=60dBu,regards as normally.

P3. Examines TV brightness; confirm whether DUAL FUNCTION is normal under DUAL

MODE: whether DUAL SENSITIVITY is normal when input signal is under LEVEL<=36dBu.

P4. Examines whether PAL color demodulation is normal by using DEM image; whether

STEREO SENSITIVITY is normal when input signal is under LEVEL<=36dBu.

P5. Examines whether DUAL FUNCTION is normal under DUAL MODE; whether

DUAL SENSITIVITY is normal when input signal is under LEVEL<=36dBu.

P6. Examines whether the sound does receive the image disturbance, Judgment basis:

Whether there is unusual sound, input signal LEVEL<=36dBu,and STEREO SENSITIVITY is normal.

P7. Adjustment attenuator, If the critical point of the change of the image signal to noise

ratio is under LEVEL<=60dBu,regards as normally.

Broadcasting

System

PATTERN SOUND P/S(dB) CONTENT

100%

SET CONTENT CHECK

-5 Mechanical

(Sweep Tone)

-16 image to sound

Stereo*2

-16 NOISE LIMITED

(400Hz)

Nicam

Stereo*2

(400Hz)

Chart 2

-10 sound image

-10 Stereo Function

-16 Mechanical

-16 NOISE LIMITED

electrical unusual sound

disturbance

SENSITIVIY

brightness effect

electrical unusual sound

SENSITIVIY

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1.4.8.VIDEO RECEIVING TEST: AV receives supply oscillator: AV/S-Video/HD/SCART1/SCART2/SCART-SV are from DVD to LCD TV; Examines whether has the image and the sound and is normal. (1). AV: Video cable (Yellow), Audio cable (Left (White), Right (Red) sound track). (2). S-Video: S-Video signal cable (White), Audio cable (Left (White), Right (Red) sound

track).

(3). HD (Ypbpr/YcbCr): brightness signal cable (Green), Component signal cable (Red,

Blue), Audio cable (Left (White), Right (Red) sound track). (4). SCART1: 21Pin SCART signal cable (Black). (5). SCART2: 21Pin SCART signal cable (Black).

1.4.9.VIDEO/AUDIO OUTPUT TEST: (1). SCART/AV output: A 32” LCD TV in AV pattern, inputs the CVBS signal; the output

meets SCART, SCART connects another 32” LCD TV which is in SCART pattern, Examines two 32” LCD TV whether demonstrates the same image. But their sound doesn’t mutually affect, Must respectively adjust volume to examine sound. AV output test method is in the same way.

(2). Under any pattern except PC pattern, The Audio output meets active extra speaker,

examines whether the extra speaker makes the sound.

1.5 Compatible Mode Table

All timings must be properly PHASED, SIZED, and CENTERED. Aspect Ratio=Resolution to which the native signal is SCALED and CENTERED

1:1=Centered,1:1 Pixel Correlation, No Scaling. No Filtering, Image must be properly phased. Full Screen=The Input timing is scaled to full screen, regardless of scaling artifacts. =>640*480 N/A=Not Applicable to a green timing.

MODE

RF(Analog)

576i

576p

HD 720p

HD 1080i 640*480@60Hz 640*480@75Hz 800*600@60Hz 800*600@75Hz

1024*768@60Hz 1024*768@75Hz 1280*720@60Hz 1280*768@60Hz 1360*768@60Hz

1280*1024@60Hz

CVBS SVHS YCBCR

(scart CVBS)

NO NO NO NO NO NO YES

YES YES YES YES NO YES NO

NO NO NO YES NO YES NO NO NO NO YES NO YES NO NO NO NO YES NO YES NO NO NO NO NO YES YES NO NO NO NO NO YES YES NO NO NO NO NO YES YES NO NO NO NO NO YES YES NO NO NO NO NO YES YES NO NO NO NO NO YES YES NO NO NO NO NO YES YES NO NO NO NO NO YES YES NO NO NO NO NO YES YES NO NO NO NO NO YES YES NO

Chart 3. Mode Compatibility Table---N3250W(G)

YPBPR

(scart RGB)

RGB

(D-Sub)

HDMI

(HDCP)

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MODE

576i**

576p**

HD 720p

HD 1080i 640*480@60Hz 640*480@75Hz 800*480@60Hz 800*600@75Hz

1024*768@60Hz 1024*768@75Hz 1280*720@60Hz 1280*768@60Hz 1360*768@60Hz

1280*1024@60Hz

Chart 4. ASPECT RATIO CONTROLS (YPBPR/RGB/HDCP Only): Viewing Window

1.6 All Modes Reset

After final QC step, we have to erase all saved changes again and restore the factory defaults. You should do “All Mode Reset” again. Power Off LCD TV. Turn off the LCD TV by pressing “Power” button.

1:1 FS FA R

N/A 1366*768 1024*768* N/A 1366*768 1024*768*

1250*700 1366*768 N/A

N/A 1366*768 N/A N/A 1366*768 1024*768* N/A 1366*768 1024*768*

800*600 1366*768 1024*768*

800*600 1366*768 1024*768* 1024*768* 1366*768 N/A 1024*768* 1366*768 N/A 1280*720* 1366*768 N/A 1280*768* 1366*768 N/A 1360*768* N/A N/A

N/A 1366*768* N/A

(on1366*768 panel)---N3250W(G)

*=Default Setting,**=These modes also woke on CVBS/SVHS/YCBCR inputs

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2. Firmware Upgrade Procedure

N3250W(G) LC

When you receive the returned LCD TV, please check whether the firmware version is the

latest. If not, please do the following procedures to upgrade it to the latest version.

2.1. Equipment Needed

- N3250W(G) LCD TV

- Fixture for Firmware Upgrade

- VGA Cable

- PC (Personal Computer)

- LPT Cable

- Firmware Upgrade Program

- One additional LCD TV for checking the program execution

Com Port

RS-232 Cable (pin to pin)

D TV

VGA Cable

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2.2. Setup Procedure

2.2.1 Connect P2 of Fixture with printer port of PC by LPT Cable.

2.2.2 Connect P1 of Fixture with N3250W(G) LCD TV by VGA Cable.

2.2.4 Connect Power Cord to N3250W(G) LCD TV.

2.2.5 Connect PC to the additional LCD TV.

2.3. ISP Download program procedure

2.3.1 Hardware Connect status:

2.3.2 Download ISP program

Step 1: Execute ISP.exe

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Step 2: Select MCU type

Pressing the Comb box to select the type of the MCU, It need to be selected the N3250W(G) LCD TV for this project., then press the OK Button.

Step 3: Load file

Press the Load MCU File button to select the file (File 0 (*.Hex)

and File 1) will be downloaded.

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Step 4: Test Communication

Pressing the ConN

ect button to test whether the communication is well.

Testing Result

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Step 5: Run

Pressing the Program All to start download program. Pressing the ‘OK’ Button to finish the

download program procedure.

Trouble shooting:

If you find the status like the follow picture. Please check the following item. a. The connecting status between PC and ISP board. b. The connecting status between ISP status and LCD TV. Turn off the power of LCD TV (AC plug off) and disconnect the D-Sub connector. To connect the D-Sub connector and then turn on the power of LCD TV.(AC plug on)

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