Roland S-50 LCD trouble

Hi there
Ive owned this Roland S50 for about ten years now and it used to be great…
Ad some point i got the audio glitch thingy do i changed the relay of a new one…
That is working fine again…
But now there is another problem…
The display goed black all the time…
It kinda light up a bit and you can read the word Loading and then it goes black…
Some time its not even the whole display that goes black maybe half of it op just a few parts…
Tryed tapping on it but it diddent do much…
So whats gould be the problem here and what shall i do about it…
Ive seen a Roland S-50 Display Bezel on Ebay
And i saw another thing a LC-15 DC/DC transformer, FIP coil for VFD display.
Somebody told me that the last one could be a solution…
I don’t know so pleas help me