HP48GX Boot Loop - help

[wmundstock]

(08-05-2022 12:50 PM)dmh Wrote:  Unfortunately I think this is what happens to a lot of 48 models eventually :-(

I have a 48GX with a similar issue but the keys that are permanently on are 0 and/or dot.

Surgery is not for the faint hearted and is very risky.

I did see one article suggesting submerging the keyboard (not the display), without disassembling the calculator, in an attempt to clean and fix it but not sure about that. Maybe someone here has tried or can comment.

I have a working 48GX and wonder if/when this will happen...

I am making progress. With the contact cleaner and isopropyl alcool I managed to get it turning on consistenly. It also fixed the reandom presses to the + key. Now the Alpha key is showing problems...

I am repeating the process now, with a lot, I mean a lot, of contact cleaner and then washing with isopropyl alcool. I am using a sringe to spray the alcool inside. I am doing this 1ml at a time, but I think i spent around 10ml of alcool already.
I can see that maybe submerging the keyboard on isopropyl could work... maybe even better would be to do that on one of those ultra sound washers... that could work well.

I do not know if it could cause any harm to the display, so I am avoiding the alcool into the display.