Broken HP-41C (won't turn on)

[Johnboy]

I have fixed a few 41c/cv/cx calcs, mostly broken screw posts or corrosion due to battery leakage, but maybe not as many as other folks here.

I agree with TallKey about cleaning all your contacts with alcohol, I use isopropanol (rubbing alcohol) or a specific purpose circuit board cleaner spray.

I'm not sure about the virtue of replacing the capacitors, I have never done that. If it's the black electrolytic caps you replaced, make sure you have the polarity correct.

I'm guessing your 41c is not the model which has nuts on the lower two screw posts, so pretty hard to do any testing without the back case half installed.

I'd clean everything thoroughly, using fresh batteries, reassemble and try the various reset methods.

Good Luck

Cheers,
John