LG C2 intermittently shows no signal on macOS Tahoe—Deep Color handshake issue?

tylerdias1 wrote:

• Using an M5 Pro MacBook Pro on macOS 26.6.2, connected directly to an LG C2 via HDMI. This worked consistently before the update.

Now the TV detects the Mac but intermittently shows no video. Happens with the lid open or closed. Multiple cables, settings resets, BetterDisplay, and disabling HDR/VRR/FreeSync haven’t fixed it. My PC works fine with the TV.

The only reliable workaround I’ve found:

Turn HDMI Deep Color off.

• Connect the Mac and wait for a picture.

• Enable Game Optimizer. Picture stays, and macOS shows 120 Hz.

Anyone else seeing this with Tahoe and an LG OLED? Found a fix that survives reconnecting or sleep/wake?

verify your software is up to date—

The current stable release of Tahoe including bug fixes, security updates is macOS 26.7.2

Keep your Mac up to date - Apple Support

https://support.apple.com/guide/mac-help/get-macos-updates-mchlpx1065/mac

Have you queried "LG C2 OLED" for support or some firmware update in relation to your issue...(?)

if in doubt search the developers website or contact their: Support/Help/FAQ/Known issues/compatibility/updates

Contact a third-party vendor - Apple Support

https://support.apple.com/en-us/HT201777