HP-65 - 1604S01786 - Display faulty or Drivers faulty ?

[albertofenini]

Hi everyone
this is a unit we acquired from a member of the forum, it's a Spanish version of the HP-65.
It had the first block of the display faulty, or at least so it seemed.
Looking at the pictures it can be seen that also the second block is faintly lit when the unit was turned on.
At first we focused on the 1st block.
We replaced the 1st block twice,we may have used a left over of a repair the first time,
but we used a better spare part the second time, however as it gets better yet is not fixed.
We used some spare parts recovered from and old HP-45, we can't remember if and how well these were working.
What do you think, is it more on the display side or on the anode and cathode drivers side ?
We rebuilt the card reader and the unit reads and write quite well
We didn't rebuild the clutch but it has to be done ....
Cleaning of keys will be done at the end, we wanted to fix the hard stuff first....
Thanks for any idea you would like to share with us ....
Take care !!!
Pictures can be seen here : HP-65 1604S01786 - Display faulty or Drivers faulty