LG Monitor not detected on macOS Sequoia 15.4 after update, but Hisense TV is detected

Question

Level 1

7 points

LG Monitor not detected on macOS Sequoia 15.4 after update, but Hisense TV is detected

My LG Monitor which I have been using as a secondary display since 4 years with macOS is not detected after the update to macOs Sequoia 15.4. The LG display goes into Power Saving Mode instead. Interestingly, it does detect Hisense TV so that rules out HDMI port failure. The display also works fine when connected to Windows PC.

After the update, the display was working on the same day. The problem started the next day. I've seen a plenty of posts about this issue on macOS Sequoia 15.3 but I did not find a solution which worked.

[Re-Titled By Moderator]

MacBook Pro 14″, macOS 15.4

Posted on Apr 6, 2025 11:43 PM

Reply

Answer 1

MV707

Level 1

14 points

Apr 11, 2025 8:58 PM in response to biopace

I had the same issue today, and saw someone say to change from T3 cable to a Thunderbolt 4 cable, so I did and the monitor worked! The only issue is the cable is nearly $200!

Reply

Answer 2

MV707

Level 1

14 points

Apr 11, 2025 8:57 PM in response to agent515

I had the same issue today, and saw someone say to change from T3 cable to a Thunderbolt 4 cable, so I did and the monitor worked! The only issue is the cable is nearly $200!

Reply

Answer 3

MV707

Level 1

14 points

May 2, 2025 1:27 PM in response to agent515

Had same issue. Switched to a Thunderbolt 4 cable (at nearly $200) and monitor worked.

Reply

Answer 4

Apr 7, 2025 1:24 AM in response to agent515

Which mac? Which display? Are you using the same HDMI cable?

Did you try restarting your mac in Safe Mode?

Most problems that I have seen mentioned in this forum have to do with using multiple external displays. Is that your situation? Does the display work if it’s the only one?

Reply