<p>I found <a href="https://github.com/Creality3DPrinting/Ender-3/issues/58#issuecomment-982732560" rel="nofollow noreferrer">the unofficial schematics</a> for the very similar 4.2.2 Creality board.</p>
<p>It contains a 4 pin header titled ICSP port.
Note that these appear to be 3.3 V pins</p>
<p><a href="https://i.sstatic.net/2P8cX.png" rel="nofollow noreferrer" title="Portion of a schematic for the Creality 4.2.3 board showing the ICSP port"><img src="https://i.sstatic.net/2P8cX.png" alt="Portion of a schematic for the Creality 4.2.3 board showing the ICSP port" title="Portion of a schematic for the Creality 4.2.3 board showing the ICSP port" /></a></p>

CC BY-SA 4.0
2022-04-06T01:16:44.413Z
2022-04-06T03:14:07.860Z
2022-04-06T03:14:07.860Z
spuder
<p>What might these 4 pins be on the Creality 4.2.3 board be?</p>
<p>The silkscreen says</p>
<pre><code>G
SC
SD
V
</code></pre>
<p><a href="https://i.sstatic.net/G2XSh.jpg" rel="nofollow noreferrer" title="Photo of Creality 4.2.3 board with 4-pin header circled"><img src="https://i.sstatic.net/G2XSh.jpg" alt="Photo of Creality 4.2.3 board with 4-pin header circled" title="Photo of Creality 4.2.3 board with 4-pin header circled" /></a></p>
<p>It is next to the pin header for the LCD, so I suspect it is either a UART or TFT port.</p>
<p>Googling I suspect <code>SD</code> <em>might</em> be short for SDA and <code>SC</code> <em>might</em> be short for <code>SCL</code>. Which are common I2C pin descriptions.</p>
<p><a href="https://github.com/MarlinFirmware/Marlin/pull/23307#issuecomment-996371949" rel="nofollow noreferrer">https://github.com/MarlinFirmware/Marlin/pull/23307#issuecomment-996371949</a></p>

<creality><part-identification>
What is this 4 pin header on the Creality 4.2.3 board?
spuder
# What is this 4 pin header on the Creality 4.2.3 board?

(Asked by: username_0 on 2022-04-06)

What might these 4 pins be on the Creality 4.2.3 board be?

The silkscreen says

```
G
SC
SD
V

```

[![Photo of Creality 4.2.3 board with 4-pin header circled](https://i.sstatic.net/G2XSh.jpg "Photo of Creality 4.2.3 board with 4-pin header circled")](https://i.sstatic.net/G2XSh.jpg "Photo of Creality 4.2.3 board with 4-pin header circled")

It is next to the pin header for the LCD, so I suspect it is either a UART or TFT port.

Googling I suspect `SD` *might* be short for SDA and `SC` *might* be short for `SCL`. Which are common I2C pin descriptions.

<https://github.com/MarlinFirmware/Marlin/pull/23307#issuecomment-996371949>

**Tags:** creality, part-identification


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## 1 answers

### Answer by username_0 on 2022-04-06. Score: 2

I found [the unofficial schematics](https://github.com/Creality3DPrinting/Ender-3/issues/58#issuecomment-982732560) for the very similar 4.2.2 Creality board.

It contains a 4 pin header titled ICSP port.
Note that these appear to be 3.3 V pins

[![Portion of a schematic for the Creality 4.2.3 board showing the ICSP port](https://i.sstatic.net/2P8cX.png "Portion of a schematic for the Creality 4.2.3 board showing the ICSP port")](https://i.sstatic.net/2P8cX.png "Portion of a schematic for the Creality 4.2.3 board showing the ICSP port")


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