No Video Output Problem
<p>[TOC]</p>
<h3>I. Problem Phenomenon</h3>
<ul>
<li>CVBS video output without display；</li>
<li>VGAvideo output without display；</li>
<li>HDMIvideo output without display；</li>
</ul>
<h3>II. Analysis steps</h3>
<p>Follow the steps below to investigate the causes of the problem one by one:</p>
<p>1、Check the power-on status of the device.
2、Is the power supply to CVBS display normal.
3、Check the wiring status of the video output.
4、Is the CVBS/VGA/HDMI display input mode switched correctly.
5、Check the settings of video output resolution and output mode.</p>
<h3>III. Operating instructions</h3>
<h4>1、Check the power-on status of the device</h4>
<ul>
<li>Check whether the device power indicator is always on, if the power light is not on, you need to check the device power supply.</li>
<li>Check whether the hard disk lock has been locked, not locked to cause the device does not power on, there is no video output.</li>
<li>Check whether ACC is open, if ACC is not open, there is no video output when it is in the off state.</li>
<li>Re-power off for a period of time and power on again to confirm whether the machine has the process of turning on；</li>
<li>Observe the lights other than the power indicator to see if they are working properly.</li>
</ul>
<h4>2、Is the power supply to CVBS display normal</h4>
<ul>
<li>Check if the power supply of CVBS output is normal.</li>
<li>Turn on the on-off button of the display and check if the CVBS screen has power status.</li>
<li>If the power supply is normal, but the display has no power supply status, please replace the display and confirm again.</li>
</ul>
<h4>3、Check the wiring status of the video output</h4>
<ul>
<li>When there is no output from CVBS, check the connection status of CVBS display and make sure the connection cable is intact.</li>
<li>When there is no output from VGA，You need to check if the VGA cable connection is normal first.</li>
<li>When there is no output from HDMI，You need to check if the HDMI cable is connected properly first.</li>
</ul>
<h4>4、Is the CVBS/VGA/HDMI display input mode switched correctly</h4>
<ul>
<li>When the display supports multiple modes and multiple video interfaces, you need to switch the input mode and video source to make sure the mode and video source are the same as the connection cable.</li>
</ul>
<h4>5、Check the settings of video output resolution and output mode</h4>
<ul>
<li>The GUI checks the resolution setting of the video output to ensure that it matches the resolution supported by the display.</li>
</ul>
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