HP 32E - Zeros in display / blank display.

[ElectroDuende]

(03-11-2015 12:14 PM)PANAMATIK Wrote:  Success!

I tried again the original chip of the 33E and discovered, that there was just a contact problem. When I pressed the chip against the board it worked and now I made it that it has contact without force.

Cheers to all from a happy 31E and 33E owner
Bernhard

Congratulations!

You did the dremel trick quite well... I wasn't so successful on my first attempt!

Regarding the contact problem... I suppose it is something one can expect; the calculator may be working properly, but once open, it is easy to touch the IC's pins or PCB pads and cause local corrosion (well, just a thin "patina") that may affect conductivity. And, as the chips are just pressed and don't slide (like HP48GX cards), the patina is not "self cleaned".