About once in a couple of months TBT3-UDV goes into a weird state when the blue light wouldn’t come on when the attached computer is powered on. The green light is on, so it’s powered up Ok.
The issue is intermittent - I would work one day normally, with a 4K display attached via TBT3-UDV, then power it down for some time - all cables are attached and not disturbed in any way, then power on the computer and the blue light on TBT3-UDV doesn’t come on and the computer doesn’t see the dock. The green light on TBT3-UDV is on when this is happening.
I am attaching the computer via the non-powered TBT3-UDV’s port because of the problems described in my other thread with the powered port:
LG 4K monitor reports that supplied cables should be used - Thunderbolt 3 / TBT3-UDV - Plugable Support
Computer Thunderbolt ports are working fine on their own.
I cannot test the other TBT3-UDV port because of the problems described in the thread mentioned above - comes back with an unrecognized USB device message, which it does half the time even when TBT3-UDV is working.
A couple of times in the past powering down/up TBT3-UDV seemed to have helped. Today, however, it didn’t work and I spent some time rebooting the computer and switching cables, etc - nothing worked.
I left it alone for about an hour and when I came back and powered up the computer, the blue light in TBT3-UDV came on. Same setup - nothing was changed since when it wasn’t working.
It is as if there’s something dangling around a threshold in the TBT3-UDV, like a dying capacitor.
I bought TBT3-UDV in October last year, so I have a few more months and it likely will happen again at least once. Can you please advise what tests do you want me to run to prove/disprove whether it’s a hardware fault in the device or not? Thanks