HP-65 1603S03504 - display not working at all

[albertofenini]

Hi Tony
You are right, the logic board works perfectly when put in another unit
Or to say it right we used a logic board coming from a working unit and we tested that after these measurements it still works when put in it’s own unit

It may be the anode driver but shouldn’t at least work the rcd signal ?
That is coming from the cathode driver right ?

Also I was expecting to see good display waves at the cpu side or the faulty anode driver may silent these ?

Thanks !!!!