HP48GX Boot Loop - help

[wmundstock]

(08-05-2022 10:19 AM)Kiwi Wrote:  I was given (for free) a HP48GX with the exact same symptoms. I also tried everything to get it working again but without any luck. Once, by changing the batteries (with another brand), I was able to get past the 'Try To Recover Memory' loop but got stuck again at the Home screen. After months of trying I gave up and decided to open it up.
Once opened, I realized that the previous owner probably left the batteries inside the HP48 because there was some battery corrosion which was almost invisible when closed. The biggest corrosion was near the negative terminal and it did attack the keyboard layers, resulting in a non functioning keyboard.
I'm not sure whether your unit has the same problem but maybe you can have a closer look at the negative terminal in the battery compartment and try to look inside the case for any corrosion.

Hope this helps.

Thank you for the response. I did look into the terminals and there seems to be a little bit of corrosion, but its really just a little bit. I letf the calculator overnight on a silica gel and in the morning I was able to get past the boot loop, but I can see that it is randomly pressing the + key. In addition it seems to be operating a little bit slower than normal... I am thinking this is the symptom of the key being pressed non stop, or may be another key. Not sure...

I am now trying to flood it with contact cleaner + isopropyl and let it dry in the silica again. Maybe, just maybe, this could help.

I may try a few more things but in the end I may have to open it. Perpaps I can fix if I can see where the problem is.
I saw a tutorial on how to open without causing permanent damage here.