Dead HP 28C

[Marcus]

My HP 28C is completely dead.
Are there any known faults that might be repairable?
How do you open the case (either side!)?

[Vieira, Luiz C. (Brazil)]

Hi;

under the plastic label, right over the display (you must carefuly remove it, try no bending it so much or you'll leave watermarks), you'll find heat-molded stakes. Cut them off (in a way you can rebuild tham) and the top cover will be off.

I have a document somewhere in here that describes a way to open the 28 with more details. If you want to have a look at the stakes for now, do it. I have removed the label of two others, and I had to open one of them. One tip: right below the plastic label, you'll have access to the (+) and (-) battery poles; after testing them directly, you'll be able to decide if you need to open it or not (one of the two I was about to open was safely revived by just cleaning the batteries contact springs).

Success.

[Marcus]

Thank you very much.
I'd never have guessed that one!