No signal to external monitor over Thunderbolt on MacBook Pro

Question

s1s0 Author

Level 1

4 points

No signal to external monitor over Thunderbolt on MacBook Pro

Trying to install external monitor (Philips 5K2K UltraWide Thunderbolt). The monitor comes with a Thunderbolt cable.

When I plug it to my MacBook Pro, the monitor complains that there is no video signal. By the way the computer is charging over that connection, yet no signs of any data exchange.
If I plug the same cable to a Windows laptop (USB-C port) - it's all working nicely including the camera, microphone etc.

Looked at System Info on the Mac, under Thunderbolt/USB4 tab. I can see:

40B1U6903CH:

Vendor Name: PHILIPS

Device Name: 40B1U6903CH

Mode: Thunderbolt 3

Device ID: 0x2

Vendor ID: 0x122

Device Revision: 0x3

UID: 0x8087FD6CA429AD00

Route String: 1

Firmware Version: 41.40

Port (Upstream):

Status: Device connected

Link Status: 0x2

Speed: 40 Gb/s

Port:

Status: No device connected

Link Status: 0x7

Speed: Up to 40 Gb/s

Any ideas? What I'm missing here?

Regards

Svilen

[Re-Titled by Moderator]

Posted on Jan 18, 2025 12:59 AM

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Answer 1

s1s0 Author

Level 1

4 points

Jan 18, 2025 11:04 AM in response to Grant Bennet-Alder

I'm not sure I can change anything when connected over the Thunderbolt:

From MAC - no chance, it is not showing me the external monitor in the display tab of System Settings
- ... the above despite the System info I reported in the first post
From the monitor - no such options in the monitor menus as far as I can see

If I connect over HDMI - ok, I can do that, yet it doesn't help the issue I think.

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Answer 2

Jan 18, 2025 5:03 AM in response to s1s0

Which MacBook Pro?

Is this the only external display? If there are others, what are they?

is it connected by a Thunderbolt cable (not just a USB-C one), and how long is the cable? I’ve read that recent versions of macOS do not like to see display transmission errors, and may cut resolution or signal if they see any.

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Answer 3

s1s0 Author

Level 1

4 points

Jan 18, 2025 6:44 AM in response to Servant of Cats

Apple M3 Pro, model Mac 15,7; OS Sequoia 15.2

That's the only external display.

The cable is Thunderbolt 4, which is coming with the monitor, but the situation is the same with Apple Original cable. The length of both is 1m.

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Answer 4

Jan 18, 2025 8:16 AM in response to s1s0

40B1U6903CH appears to be a 5120 x 2160 display with 10-bits/color capaibility(HDR)

Signal Input:

HDMI 2.0 x 2,

DisplayPort 1.4 x 1,

Thunderbolt 4 x 1

if you lower the resolution to 4K at 30 Hz, do you get a picture?

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