This widget could not be displayed.
This widget could not be displayed.
cancel
Showing results for 
Search instead for 
Did you mean: 

Expertbook B9400CEA: No signal to external monitor through USB-C / thunderbolt connection

tkhfung
Star I
System: Windows 11, Firmware 311
Battery or AC:
Model: Expertbook 9400CEA
Frequency of occurrence:
Reset OS:
Screenshot or video:
========================
Detailed description:I have a LG 29" monitor with both HDMI, DP & USB-C input ports at the back. I can connect it to my expertbook through the HDMI port no problem, but when I use the USB-C to thunderbolt connection, the external monitor does not receive any signal.
The monitor can detect that I've made a physical connection with the thunderbolt, and asks if I would like to switch from HDMI, but when I do switch, there is a black screen with no video input.
On the laptop end, it can also sense that I've connected the thunderbolt to a monitor, as the charging icon shows up over the battery, but I cannot get any video to display on the external monitor if I specificially select screen mirror / extension.
I've ensured all the USB controller & hosts drivers on the laptop is up to date, but the problem persists.
Any advice?
4 REPLIES 4

Falcon_ASUS
Moderator
Moderator
tkhfung
  1. System: Windows 11, Firmware 311
  2. Battery or AC:
  3. Model: Expertbook 9400CEA
  4. Frequency of occurrence:
  5. Reset OS:
  6. Screenshot or video:

========================

Detailed description:I have a LG 29" monitor with both HDMI, DP & USB-C input ports at the back. I can connect it to my expertbook through the HDMI port no problem, but when I use the USB-C to thunderbolt connection, the external monitor does not receive any signal.

The monitor can detect that I've made a physical connection with the thunderbolt, and asks if I would like to switch from HDMI, but when I do switch, there is a black screen with no video input.

On the laptop end, it can also sense that I've connected the thunderbolt to a monitor, as the charging icon shows up over the battery, but I cannot get any video to display on the external monitor if I specificially select screen mirror / extension.

I've ensured all the USB controller & hosts drivers on the laptop is up to date, but the problem persists.

Any advice?


Expertbook B9400CEA: No signal to external monitor through USB-C / thunderbolt connection
@tkhfung
Have you tested other cables?
If the other cables are replaced and the condition remains the same, I would suggest you bring back your laptop to our service center.
The following is the contact information: 
http://www.asus.com/support/Service-Center-All-Countries/
Also you can contact the local service center for help. The following is the contact information: 
http://www.asus.com/support/CallUs#
Sorry for any inconvenience it may be caused. 

Rora
Star I
I think you need to check the settings because sometimes that might be the problem. But if that doesn't help, I recommend you to contact a professional who will definitely be able to help you.

kukuriga
Star II
Rora

I think you need to check the settings because sometimes that might be the problem. But if that doesn't help, I recommend you to contact a professional who will definitely be able to help you.


View post
 I had an old monitor for a long time, and then one day, it went out and wouldn't turn on anymore. I went to a mechanic, and he explained that the monitor was too old and pointless to repair it. So I decided to buy a new monitor for work. A friend of mine advised me to buy a great monitor, so I did. The new monitor was much more comfortable to use.

ASUS_Bot
Rising Star II
Thread automatically closed due to inactivity. If the reported issue has not been resolved or you require further assistance from one of our moderators, please create a new thread and we will be with you shortly.