Information Display totally blank

[Loves Mazda]

Hello everybody.
My Mazda 5 from 2007 has served me very well, but now I have a problem - that I hope someone have a solution to.
The Information Display is totally blank - not a single segment. The Clock which works separately in the left side of the display works fine. The Display light up fine - but when I turn on the headlight, the Display nearly loose all the light. This makes me think that the problem is connected to a fault, maybe in an electrical relay, that steel all the power to the Display. I dont think that the fault is in the Display it selves, as it doesnt show just a single segment. The AirCon, Radio and CD-player works normal - BUT after disconnecting the headwire to the Battery a few minutes, in the hope that a power-reset would solve the problem, the radio/CD doesnt work anymore. I gues that this is because it will take a passcode to install these functions again because of theft-security, but as I cant read the Display - I cant put in the code.
I have checked all fuses in the 2 fuseboxes, all relays for burned connections, disassemblet the Display to check all solders - but everything looks fine.
Does anyone have an idear
Best regards "Loves Mazda"

 

[phunky.buddha]

Open the center dash and look for loose connection? Broken solder joints on the display board?

 

[Loves Mazda]

Open the center dash and look for loose connection? Broken solder joints on the display board?

Hey phunky.buddha
Thank you for your answer. I have allready checked for loose connections, and specially the solder connections on the Display in a microscope, but everything looks fine.
Do you think that the fault could be outside from the display, as it dont miss just some of the segments - but is totally blank, and nearly loose all the light/power when I switch the headlight on?
Best regards