HP 21 not powering on - repair/troubleshooting advice

[Steve Simpkin]

(02-03-2021 01:10 AM)dmh Wrote:  Unfortunately the '4' key has stopped working again.

I've tried the same steps again as previously recommended but no go (including a drop of alcohol).

All other keys are still fine ('5' double bounces sometimes) so is this still just the key switch or could it be something else?

I don't think I'm up to pulling the keyboard apart.

The unit is so clean and nice in every other way :-(

Don't give up. You might have more luck with a tiny amount of contact cleaner or a product called deoxit.
https://www.hpmuseum.org/forum/thread-15247.html