HP65 Extreme Makeover S/N 1333S07557 - Advice requested

[teenix]

(05-22-2019 09:30 PM)albertofenini Wrote:  It is working, except of course for the card reader, but the second digit is dimmed,

Hi Alberto,

I would suspect the cathode driver. The 2nd digit should be pin 7 of the cathode chip. It could also be a dry solder joint on this pin or the corresponding common cathode pin on the LED display, or a dodgy PCB trace between the two.

cheers

Tony