What if the computer cannot be connected to the projector? PC connected projector does not display how to process

Some conference content requires the projector to be connected to the computer for display. The screen placed under the projector has always been a pain in the user's heart. It is not too small, or no graphics. It can affect the projector display screen in three directions, the projector settings, the line connection fault of the computer connected to the projector and the setting of the projector on the computer side. Read below to find out if your computer is connected to a projector with no image display or no signal.

First Part:

a projector RGB signal input port no

when switching to the projector RGB output, suggesting no RGB signal input port. First, check if the VGA cable is connected properly. If the normal description of the notebook VGA output port has no signal output, the problem is on the computer. Is the VGA port damaged? The general probability is relatively small. By consulting the data, it is found that there are generally three output modes for notebook computers:

1. LCD screen output, no output on the VGA port. This is the default way, maybe consider the reasons for power saving!

2, VGA port output, no output on the screen.

3, VGA port and screen have output.

So, the computer must switch to the third output mode. Take Lenovo Zhaoyang notebook computer as an example, the switching mode is keyboard Fn+ port. In the past, older notebooks such as Toshiba switched the hard switch on the side of the notebook.

Second, the projector has information input, but no image

In the case that the notebook laptop output mode is correct, the above fault should first check whether the resolution and refresh rate of the computer are Matches the projector. We know that laptops generally have a high hardware configuration, and the resolution and refresh rate that can be achieved are high. However, if the maximum resolution and refresh rate of the projector are exceeded, the above phenomenon will occur. The solution is very simple. Use the display adapter of the computer to lower the two parameters. The general resolution is no more than 600*800, and the refresh rate is between 60~75 Hz. Refer to the projector manual. In addition, there may be cases where the display adapter cannot be adjusted. Please re-install the original graphics driver and adjust it.

III. Projection image color cast

This is mainly a problem with the VGA cable. Check if the interface between the VGA cable and the computer and projector is tight. If the problem still exists, then you can buy a good quality VGA cable, pay attention to the port model!

END

Part II:

First, the PC is connected to the projector and the notebook external display

When the PC is connected to the projector, two types are generally used. Method: Use a dual graphics card or use a video splitter.

Using two graphics cards, one PC is plugged into two graphics cards at the same time, one graphics card is connected to the monitor, and the other graphics card is connected to the projector. The function of the video distributor is to divide one video input signal into multiple channels of the same video. Signal output.

Most laptops are designed with an RGB interface for an external monitor or projector.

Notebook connection monitor needs to pay attention to two points:

1, notebook open RGB interface

1, open in the BIOS when the computer starts to enter the BIOS settings, set the notebook display The display (display) is both.

2, set the computer dual-screen display in the display properties can be divided into two modes: one is mirror mode, the other is extended mode.

When using mirror mode, the laptop LCD and projector screen display are identical. When using the extended mode, the projector display is an extension of the main display (laptop LCD). When setting up dual screen, be sure to connect the projector or other display device in advance, otherwise it will not be set correctly. Bring up the Display Properties dialog box and select multiple monitors in the settings, ie Notebook + Projector.

3, using the function key Fn is the abbreviation of the word Function, almost all laptops have Fn key, its role is to form a combination of keys with other keys, to achieve hardware adjustment and switching functions . Here you need another button. There is a notebook screen button on the keyboard button. Most notebooks are F8. Use Fn+F8 to switch.

Need to switch more times, the general situation:

The first time you switch, the projector displays, the computer does not display;

The second switch, both display;

The third time, the projector does not display, the computer displays.

2, resolution and refresh rate

The resolution and refresh rate of the notebook confirm whether the resolution and refresh rate of the graphics card are within the acceptance range of the projector, do not know the range can be lowered a little , such as 1024 * 768 & mdash; 75HZ.

Second, notebook connection projector common problems and solutions

1, can not play video solutions

Symptom: notebook is a Windows system, connected to the projector with WMP When REALPALER and Kingsoft have played a video file, the notebook displays normally, but when projected, the video frame is black and there is no image.

Cause: This is due to a mismatch in display properties and projector performance.

Solution 1: Modify: Display Properties — Set — Advanced — Performance & mdash; Hardware Acceleration.

It is easy to solve the problem of TV rear projection and projector video file playback by speeding down the hardware.

Solution 2: A slight modification in the software for playing the video file can easily solve the problem that the TV rear projection and the projector video file cannot be played normally. For several video playback softwares that are commonly used at present, the solutions are as follows:

1.Realone Player

Click on the “Tools/Preferences” menu to enter the “Preferences” menu. ”Settings dialog box, select the <quo;hardware" item in the "category" column, tick [Enable full screen video control] in the "Playback performance" column, and then "video card compatibility" The slider in the bar is dragged to the leftmost [most reliable].

2, Windows Media Player

Click on the "Tools/Options" menu, go to the "Options" dialog box, select the "Performance" item, in the following &ldquo ; Video Acceleration & rdquo; drag the slider to the middle, as shown below:

3, Super Jieba

Click “ Video /Display Settings /Multi Display Settings & rdquo; menu, appears in the "Settings Center" dialog box, check the [Start multi-display split screen display function], and in the "hardware acceleration" column, check [Use hardware YUV acceleration].

2, the projector display resolution is not right

Symptom:

1, the screen picture display is not complete, or up and down or left and right, there are always some places are not complete;

2. Open the opportunity to display the progress bar and the startup screen, and then it will not be displayed.

Solution: Modify the notebook resolution, for example to 800*600 or lower, do not use widescreen resolution and so on.

3, the projector can not display or display incomplete

Symptom: In the case of ensuring that the projector's power cable, data signal cable, etc. are connected correctly, the projector's bulb and cooling fan are also It works normally, but no screens in the computer are projected. Or sometimes the projection screen is not completely displayed.

Cause: Because the projector's lamp and cooling fan can operate normally, the possibility of projector failure is eliminated, and the computer can be used normally, thus eliminating the possibility of computer failure. So, the problem may be in the signal cable or the settings of the projector and computer.

Solution: Most projector users use a laptop to connect to it, so the projection cannot be caused by the external video port of the notebook being activated. Just press and hold the Fn button on the laptop. Then press the corresponding function key labeled LCD/CRT or display icon at the same time, and switch with the F7 button as shown below. When it is still unable to display after switching, it may be the problem of computer input resolution. In this case, just adjust the display resolution and refresh rate of the computer to the range allowed by the projector, and also pay attention to the width of the projector. High ratio setting.

Note: Sometimes the projection screen can display, but it only shows a part of the image on the computer. At this time, the output resolution of the computer may be too high. You can reduce the resolution of the computer and then project it. If the problem persists after the above processing, it may be that the LCD panel of the LCD projector has been damaged or the DMD chip in the DLP projector has been damaged, and then it needs to be sent to the professional for maintenance.

END

Part III:

After connecting the projector to the projector, press the Fn+F4 key on the keyboard (depending on the model of the notebook, pay attention to F4 or other There is a small box on the button. The projector can be displayed, but some projectors are not displayed after the projector is connected to the projector. The Sony notebook is used as an example to illustrate the solution.

1, right-click on the desktop - Properties - Settings - Advanced;

2, click on the title card notebook belongs;

3, click on notebook And the monitor icon (the icon with two computer screens):

1. When the first icon (monitor) is clicked, the notebook will not be displayed and the projector will display.

2. When the second icon (notebook) is clicked, the notebook is displayed and the projector is not displayed.

4, click OK projector can be displayed.

END

Knowledge Extension

Hotkeys for connecting notebooks to different notebooks:

TOSHIBA→Fn+F5

IBM→Fn+F7

Compaq→Fn+F4

Gateway→Fn+F3

NEC→Fn+F3

Panasonic(Fn+F3< Br>

Fujitsu→Fn+F10

DEC→Fn+F4

Sharp→Fn+F5

Hitachi→Fn+F7

Dell&rarr ;Fn+F8

Coloful→Fn+F2

The above is about the computer connected to the projector without image display or no signal solution, please follow some tutorial references, you can use the computer connection The projector is delivered.