I change batteries and the sign "Low battery" remain there
I change the batteries HP49g+ all of them, including the back up but the sign "Low battery" always keep on.
Every time I turn on the calculator the sign is there.
I don't want to make a Hard reset since I would lose all the programs.
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You may want to try & reset your calculator. Take out the batteries including the backup battery behind a little door in the battery compartment. You'll need a small phillips screwdriver to take out the battery.
Leave the batteries out for at least 10 hours and then reinstall them and try your calculator again. If this doesn't work, try replacing all batteries including the backup battery.
Turn off the calculator and turn it over with the back facing you. Using a small Phillips screwdriver, remove the four screws from the back cover. Carefully pry off the back cover. Using a small Phillips screwdriver, remove the screws from the metal battery cover and lift the cover off the battery. Tip the calculator slightly to remove the battery. Caution: Avoid contact with other calculator components. Install the new battery with the positive sign (+) sign down (not showing). Replace the battery cover and the screws that hold it in place. Align the screw holes in the back cover with those in the calculator, then snap the back cover onto the calculator. Replace the screws.
try changing the back up battery also. This generally helps. The next time you change your batteries, change them one at a time. don't take them all out at once. This won't happen if you do it like that.
You can try to turn the contrast down by pressing 2nd and then hold "down" If the screen does not fix, put new batteries in (including the back up batteries). The problem will be resolved. Hope this helps...