HP-65 1333A02242 display missing all the decimal dots

[albertofenini]

Hi Tony
Thank you very much for the interesting explanation.

Let me ask you, are RCD and STEP the same ?

At this point what’s your diagnosis ?

The cpu board proved itself working when put in another unit so I
would assume something is wrong on this keyboard pcb

Is the wave for the h segment (the decimal point) correct ?

Could the anode driver or the cathode driver possibly defective ?

By the way We have also another unit , which we posted about this summer, with all the g segment missing, would it possibly be a similar problem ?

Take care and thanks again!!!