Netflix Black Screen With USB-C to HDMI? HDCP Explained

Netflix shows a black screen over USB-C to HDMI because of HDCP, a copy-protection handshake between your phone and the TV that Netflix requires before it will output video. If any link in the chain fails the check, or the app simply refuses external displays on your phone, you get sound with a black picture or an error message. No app can bypass this, but your own photos and videos, and many other sources, work fine on the same cable.

What HDCP is

HDCP stands for High-bandwidth Digital Content Protection. It encrypts the video signal between a source and a display so it cannot be captured in between. Every device in the chain has to support it: the phone's video output, the chip in the USB-C to HDMI adapter, and the TV's HDMI input. There are two common versions, HDCP 1.4 and HDCP 2.2, and streaming services ask for a specific version depending on the resolution.

Streaming apps use a DRM system called Widevine to decrypt their video. Widevine checks whether the output path is protected. If it is not, the app either refuses to play, drops to a low resolution, or plays audio while painting the video area black.

Why the screen goes black rather than showing an error

Android lets an app mark its video as secure. Secure content is rendered in a protected buffer that the system will not copy to an unprotected display. Mirroring and wired output are treated as displays, so the phone shows the video normally while the TV receives a black rectangle where the video should be. Audio is not protected the same way, so it usually continues, which is why it feels like a display fault rather than a deliberate block.

Some apps detect the external display and stop playback with a message instead. Others let you keep browsing the catalogue and only fail when you press play. Both are the same underlying restriction.

Which streaming apps block output

Based on how these services behave on Android phones connected to a TV by cable:

• Netflix: enforces HDCP. Black screen or an error on most phones in mirroring mode.
• Disney+: enforces HDCP. Similar behaviour.
• Prime Video: enforces HDCP for its own catalogue.
• Hulu, Max, Paramount+, Peacock, Apple TV: enforce HDCP.
• YouTube: generally plays over HDMI without restriction, including in mirroring.
• Plex, Jellyfin, VLC, MX Player, and the phone's gallery: play anything that is not DRM-protected.
• Downloaded content in Netflix or Disney+: still blocked. Offline downloads are encrypted the same way as streams.

Which side of the line an app lands on can change with an update, so treat this list as a guide rather than a promise.

Why it depends on your phone

Enforcement only blocks outputs that fail the check, so on some phones streaming apps do work over a cable.

• Samsung DeX presents a display that passes HDCP on many Galaxy models, so Netflix often plays inside DeX even when it fails in plain mirroring.
• Pixel 8 and later output over USB-C with HDCP support, and behaviour varies by app.
• Some phones support DP Alt Mode but do not implement HDCP on the port, so every DRM app fails.
• The adapter matters too. A cheap adapter without HDCP support fails the check even on a compliant phone.

There is no reliable way to know in advance, so test with the exact app you care about. The Samsung compatibility page and the DeX guide cover what to expect from Galaxy phones.

Why your own files work

Photos and videos you recorded, music you own, and files you copied onto the phone have no DRM. Nothing checks the output path, so they play at full resolution on any display through any adapter. This is why a cable that seems broken with Netflix works perfectly with the gallery.

The app is built around this. It plays local photos, videos, and music in a clean TV layout over the cable, with the phone as the remote. It is not a workaround for Netflix; it is the right tool for the content that a wired connection is actually good at. Details are on the app page.

What actually works for streaming

1. Use the TV's own app. Almost every smart TV has Netflix, Disney+, and Prime Video built in. Sign in on the TV and stream directly at full quality.
2. Use a streaming stick. A Chromecast, Fire TV Stick, or Roku in the HDMI port gives an older TV the same apps.
3. Try DeX on a Galaxy phone. Start DeX rather than mirroring, open Netflix, and press play. If it works, it works at DeX's full quality.
4. Cast from the app to a Chromecast. Netflix's cast button sends a link to the TV, and the TV fetches the stream itself, so HDCP is handled on the TV side.
5. Play your own files over the cable with the app.

What does not work: screen recording apps, "HDMI splitter" tricks, developer options, or any app promising to remove the restriction.

Why no app can bypass DRM

Widevine on modern phones runs at security level L1, where decryption happens inside a protected part of the processor that apps cannot read. The decrypted video never passes through normal memory. An app on the phone cannot capture it, and the system will not copy it to an unprotected display. Even if a technical workaround existed, distributing it would break Google Play's rules and the streaming services' terms, so it would not last.

Any app on the store claiming to send Netflix to your TV over a cable is either casting a link to a Chromecast, which is a legitimate and different thing, or not doing what it says.

Related problems that look similar

• Black screen in every app, including the gallery: that is not HDCP. See the not working guide.
• Picture but no audio in the gallery: an audio routing issue. See the no sound guide.
• Netflix plays but at low resolution: the chain passed HDCP 1.4 but not 2.2. A newer adapter or a different TV port may fix it.

What to do next

Stop testing Netflix over the cable. Use the TV's own Netflix app or a streaming stick for subscription video, and use the cable with the app for the photos, home videos, and music that HDCP does not touch.