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5) The development board has an Ethernet port, which can be plugged into a network cable for Internet access<br>
6) Connect a 5V/3A (5V/4A can also) high-quality power adapter<br>
<p style="color:#ff0000;padding-left:20px;font-weight:700;">
a.Orange Pi 4 LTS cannot be powered through the 5v pin on the 26pin interface<br>
b. Remember not to plug in the 12V power adapter, if the 12V power adapter is plugged in, it will burn out the development board<br>
c. Many unstable phenomena during system startup are basically caused by power supply problems, so a reliable power adapter is very important
</p>
1)Then turn on the switch of the power adapter. If everything is normal, the HDMI display can see the startup screen of the system.<br>
2)If you want to view the output information of the system through the debugging serial port, please use the USB to TTL module and DuPont cable to connect the development board to the computer. For the connection method of the serial port, please refer to the section on how to use the debugging serial port.
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'''How to judge whether the system has started normally:'''<br>
'''1) If the HDMI display is connected, the judgment method is very simple. As long as the HDMI display normally displays the interface of the system, it means that the system has been started normally;'''<br>
'''2) If there is no HDMI display, you can connect the development board to the computer through the serial cable, and check the startup status of the system by debugging the log information output by the serial port. If the serial port output stops at the login interface of the terminal, it means that the system has been started normally;'''<br>
'''3) If there is no HDMI display and serial port cable, you can judge the startup status of the system through the two LED lights on the development board. If the red LED light is on and the green LED light is flashing, the system has generally started normally. , If after power-on and waiting for a period of time, only the red LED light is on, or the red and green LED lights are not on, it means that the system has not started normally.'''<br>
'''If the system fails to start or cannot enter the login interface normally, please check the following first:'''<br>
'''1) Check whether the downloaded image is damaged, which can be judged by calculating the checksum attached to the image;'''<br>
'''2) If there is any problem in the process of burning the image to the TF card, you can re-burn the image and test it again;'''<br>
'''3) Make sure there is no problem with the power adapter, you can try another one;'''<br>
'''4) Make sure that the TF card meets the requirements of the Orange Pi development board. If there is an extra TF card, you can try to change the TF card and then burn the image and test it again;'''<br>
'''5) If all of the above are OK, please save the output log of the debugging serial port during the system startup process (preferably in the form of txt text instead of taking pictures), and then report the problem to the customer service.'''<br>
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=== '''How to debug the serial port''' ===
<br>
==== '''Connection instructions for debugging serial port''' ====
<br>
1)First, you need to prepare a 3.3V USB to TTL module. For better platform compatibility, it is recommended to use the CH340 USB to TTL module. Then insert one end of the USB interface of the USB to TTL module into the USB interface of the computer
<div style="padding-left:200px;">[[文件:Orange-pi-4-lts-img76.png|600px|]]</div>
2)The corresponding relationship between the debug serial port GND, RXD and TXD pins of the development board is shown in the figure below
<div style="padding-left:200px;">[[文件:Orange-pi-4-lts-img77.png|600px|]]</div>
3)The GND, TXD and RXD pins of the USB to TTL module need to be connected to the debug serial port of the development board through a DuPont cable<br>
<p style="padding-left:20px;">
a.Connect the GND of the USB to TTL module to the GND of the development board<br>
b.The RX of the USB to TTL module is connected to the TX of the development board<br>
c.The TX of the USB to TTL module is connected to the RX of the development board
</p>
4)The schematic diagram of connecting the USB to TTL module to the computer and the Orange Pi development board is shown below
<div style="padding-left:200px;">[[文件:Orange-pi-4-lts-img78.png|600px|]]</div>
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'''The TX and RX of the serial port need to be cross-connected. If you don’t want to carefully distinguish the order of TX and RX, you can connect the TX and RX of the serial port casually. If there is no output in the test, then exchange the order of TX and RX, so there is always a the order is correct'''
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5)If the CP2102 USB to TTL module is used, in the case of a baud rate of 1500000, some systems may encounter garbled or unusable problems. The specific test situation is as follows<br>