HP-65 1333A04841 restoration it doesn't work anymore ...

[albertofenini]

Hi Tony, Hi everyone

few more updates on this unit 1333A04841

We have traced Vcc and Init on both units, screenshots are available in the updated photo album
they definitely look the same to us

We noticed that the unit 1333A04841 when it doesn't light up at the first try and if it's not switched
off for the second try, few seconds after the first try shows a blinking 0.00

We tried to compare RA and RB, we have been more accurate in taking the traces
screenshot are included, they really looks similar between unit 1333A20064 (working) and 1333A04841 (not working),
still the second doesn't read

However, in few occasions, the unit 1333A04841 has completed reading a card, sometimes a steady 0.00
has shown up a little too early and other times the screen remained blank, in both cases however the
execution of whatsoever was read on the card was erratic, two videos are included in the updated photo
album

Hope this can help ...

Thanks to everyone, take care !!

Updated photo album is here : Updated album for 1333A04841