HP-65 1333A02242 display missing all the decimal dots

[albertofenini]

Hi everyone
this is a more challenging work ...
The unit is working in the meaning that it turns on but all of the decimal dots are missing
We have given the unit a good clean and thinking of a cold joint on the pin that control
the decimal dot anode segment (I believe is the h segment)
we have refreshed that soldered pin of the 1820-1029 anode driver
However it didn't fix the problem
What could we possibly check to troubleshoot the problem ?
Thanks in advance for any idea you may want to share with us
Take care !!
HP-65 1333A02242 display missing all the decimal dots