Common problem handling:     Doesn't light up, no response, no signal on blue screen?     If it is a black screen and there is no response at all,then check whether the power supply is connected properly.You can first try to enter the blue screen standby interface without plugging in HDMI.If there is no signal,check the connection of the driver board cable and the connection of the HDMI cable.It is best to test whether to enter the desktop without connecting the extension cable.You can also right-click in the computer system to display the settings and see if the screen is detected.     If the screen is not bright, the first is that the cable is not connected properly, and the second is the driver. Problem, uninstall the driver in the official download and install again.          Does the screen have black stripes or something?     Generally, it is caused by not connecting the cable properly. If the cable is checked and there is no problem, you can plug in the key board and press the 2 buttons close to the infrared receiver at the same time to enter the engineering mode and adjust the VCOM parameters. How much, just adjust to normal and perfect display     AIDA64 download and design tutorial:     https://wwa.lanzous.com/b0fdwd32j     Password: bxav     After installation, you can request a software setup tutorial     The software installation tutorial contains a template. Once it is sent out, it will not be returned, please light it into the system before requesting it, please be aware     Screen wiring tutorial:     https://shimo.im/docs/Gw6VJ6WhqCjdpXD8     Video version:     Link: https://pan.baidu.com/s/1LwLlebe0BTBJvMTd0tfpUg Extraction code: qd5n     Product:     You can think of it as just a small display (it is)     Can be used as a live broadcast secondary screen to watch the barrage     You can put the desktop OR case to view the computerreal-time temperature and frequency and other parameters     You can watch online lessons on TV while playing games     Colour: black     Material: metal + plastic          Package Contents:     1 * 7 Inch IPS Screen          Only the above package content, other products are not included.     Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.