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48GX - screen is all black - please help! - Printable Version

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48GX - screen is all black - please help! - Kath - 07-30-2009

Hit the 'on' button on the 48GX this morning and the whole screen is displaying all black pixels except for one vertical stripe down the middle. It's not responding to the 'off' command. Took out the batteries and replaced them with all new batteries, and the all-black screen displayed immediately, without even hitting the 'on' button. It's 10-yrs old, barely used during the past 5 years or so, never been dropped, worked fine yesterday... too old for HP to service. Any ideas on how to get it up 'n running again? Please help!! Thanks in advance, ~~Kath


Re: 48GX - screen is all black - please help! - Raymond Del Tondo - 07-30-2009

There are different things you could try, given you have batteries installed:


- NEVER PUT IN THE BATTERIES IN THE WRONG DIRECTION!

- ON+C

If that doesn't work, then

- If you turn the HP-48GX around, the upper right rubber foot hides a reset hole. CAREFULLY stick a needle into it until it hits ground, then remove the needle.

About the battery polarity warning: There's a big chance that you will fry the zener diode if you put in batteries with the wrong polarity.

HTH


Re: 48GX - screen is all black - please help! - Kath - 07-30-2009

The reset button worked! I had no idea there was a reset button.
Thanks for your help; it is much appreciated!!!
~~Kath


Re: 48GX - screen is all black - please help! - Raymond Del Tondo - 07-31-2009

Glad you could revive your HP-48GX:-)

And if you want to speed up your HP-48 to the max, you could try SpeedUI, available on www.hpcalc.org

HTH

Raymond