JLP

And you are perfectly right... That's the problem indeed. I've found the answer somewhere else
Actually none of the X Series cameras are allowing the use of an external monitor on live view. Let's hope it could be added at some point with a firmware update (if possible, I don't know about that).
 
For now, the external monitor can only be used when playing back still images or videos. That's already great while shooting landscapes as possible to check images on location with a big screen and to be sure everything is looking good before leaving the place but still, I would have really enjoyed to also have the live view possibility.
 
Crossing the fingers it will become available soon ;-)

Hello,
  I just got a FEELWORLD 7" IPS 4K HDMI Full HD 1920x1200 On-Camera Monitor FW760 to use with my Fuji X-Pro2   After trying to make it work and also try to find some info online for more than 2 hours, I’m now starting to become really frustrated by this thing so I do believe it is wiser and the right time to ask online.   The external monitor is connected to my camera by a HDMI cable (Normal from the screen to micro on the Fuji X-Pro2 port). When I use the play back function to see my images recorded on the SD card, they are showing on the big external monitor and all controls from the camera seems to work well (zoom in and out, moving to next image,…) but the trouble is when I want to use the external monitor on Live View… Then, blue screen with the HDMI mention on the top right and a permanent “No Signal” message centred on the screen.   I’m not interested in making videos but as I was trying to make this screen working, I tried a video and same thing… Showing up on the external screen when playing back but not while recording on live view.   As it works very well (awesome colours and very sharp view) on play back mode, I guess the cable connection is good and I must miss some setting(s) to be changed on the camera itself. I checked everything on the camera menus but can’t find what’s wrong.   Any help would be greatly appreciated   Thank you

Perhaps Fuji never intended the camera to work that way.
I have an XPRO2 as well and have been hoping to read how to set up an external monitor also.
 
Sent from my SAMSUNG-SM-N900A using Tapatalk

Hello,
  I just got a FEELWORLD 7" IPS 4K HDMI Full HD 1920x1200 On-Camera Monitor FW760 to use with my Fuji X-Pro2   After trying to make it work and also try to find some info online for more than 2 hours, I’m now starting to become really frustrated by this thing so I do believe it is wiser and the right time to ask online.   The external monitor is connected to my camera by a HDMI cable (Normal from the screen to micro on the Fuji X-Pro2 port). When I use the play back function to see my images recorded on the SD card, they are showing on the big external monitor and all controls from the camera seems to work well (zoom in and out, moving to next image,…) but the trouble is when I want to use the external monitor on Live View… Then, blue screen with the HDMI mention on the top right and a permanent “No Signal” message centred on the screen.   I’m not interested in making videos but as I was trying to make this screen working, I tried a video and same thing… Showing up on the external screen when playing back but not while recording on live view.   As it works very well (awesome colours and very sharp view) on play back mode, I guess the cable connection is good and I must miss some setting(s) to be changed on the camera itself. I checked everything on the camera menus but can’t find what’s wrong.   Any help would be greatly appreciated   Thank you