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<summary>Why OLED is not display?</summary>
<p>A: Please follow the steps below to check</p>
<p>1. Please confirm that your OS is right:</p>
<p>Due to downloading the wrong firmware, the OLED cannot be displayed. We ALSO made such mistakes during testing.</p>
<p><a href="/File:Pi4-V3-HAT.png" class="image"><img alt="Pi4-V3-HAT.png" src="/images/thumb/b/be/Pi4-V3-HAT.png/800px-Pi4-V3-HAT.png" decoding="async" width="800" height="616" srcset="/images/thumb/b/be/Pi4-V3-HAT.png/1200px-Pi4-V3-HAT.png 1.5x, /images/b/be/Pi4-V3-HAT.png 2x" data-file-width="1443" data-file-height="1112"></a>
</p>
<p>2. Please check if the order of OLED screen pins is correct, please contact us if it's a wrong pin order;</p>
<p><a href="/File:OLED-IMG-4373-1.jpg" class="image"><img alt="OLED-IMG-4373-1.jpg" src="/images/6/6e/OLED-IMG-4373-1.jpg" decoding="async" width="864" height="710" data-file-width="864" data-file-height="710"></a>
</p>
<pre>pi@raspberrypi:~ $ sudo i2cdetect -y 1
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- 3c -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --
</pre>
<p>3c is a hexadecimal number, it is the I2C address of OLED, if you can’t find this value, please shut down and reconnect X630-A3&OLED and run this command again, If you still can't find the OLED's I2C address, the OLED screen may be damaged.</p>
<p>4. Then run the following command to enable OLED display:</p>
<pre>
rw
systemctl enable --now kvmd-oled
ro
</pre>
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