---
title: How to check HDMI Out settings on your CommBox Classic S4 or S5 screen
description: Learn how to access and configure HDMI Out settings on your CommBox Classic S4 or S4+ to enable video and audio passthrough to external devices.
---

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# How to check HDMI Out settings on your CommBox Classic S4 or S5 screen

## Learn how to access and configure HDMI Out settings to ensure proper video and audio output from your CommBox screen.

**Applies To**  
Applies to: Classic S4, Classic S4+, Classic S5

#### Step 1

Swipe up from the bottom middle of the screen to open the Inputs Menu.

#### Step 2

Tap the **Other** tab at the top of the screen.

#### Step 3

Scroll down until you find the **HDMI OUT** section.

![](https://api.hubspot.com/filemanager/api/v2/files/191545889125/signed-url-redirect?portalId=21111512)

#### Step 4

Make sure **HDMI OUT** is toggled ON. This enables signal output through the HDMI Out port.

#### Step 5

Check the **HDMI OUT Format** and make sure it matches the resolution supported by the device receiving the signal (e.g. 1080p or 4K).

💡 Tip: Most projectors and secondary displays support 1080p. Select 4K only if you’re sure the receiving device supports it.

#### Step 6

Toggle **HDMI Passthrough** ON to ensure audio and video pass through from the connected input device to the external display.

#### Step 7

Reboot your CommBox screen after making all changes. This helps ensure the new settings take effect properly.

**Troubleshooting / What to Do If It Doesn’t Work**

- If the HDMI Out options aren’t available in the menu, your screen may need a firmware update.  
  👉 Go to **Settings \> System \> System Update \> Check for Update**
  
    - Make sure you have updated the CommBox OS Bundle from the Store application
    - Launch the Store app, if there is an OS bundle available. this will be displayed in a banner at the top of the Store app
- Make sure the receiving device (like a projector or display) is turned on and connected properly.
- Double-check that the HDMI cable is securely connected to the HDMI Out port.
- Restart both the CommBox screen and the connected device after adjusting settings.

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