MP 1,1-5,1 Strange issues with my cinema display 27

[sbyseven]

Hi all,
I have a cinema display 27 with a mac pro 5.1 that works when it wants. If I don't make any changes to the software it usually works perfectly, but if I make any changes like updates or so, it doesn't work at all; even if I plug it into a mac mini 2012 or my MacBook air 2017 it doesn't work at all.
What can be causing this kind of behavior? And how can I solve it?

 

[tommy chen]

it dies slowly (backlight)

 

[sbyseven]

It is not because of the backlight, I have seen that is because of the power supply. I'm going to change the capacitors from the power supply board, as soon as I receive them because I read on other forums that apple put cheap ones that cause that kind of behavior and let you know. But thanks for the fast reply.

 

[tommy chen]

yes, the PSU is the second failure