Question about HP 48gx Calculator

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Nothing happened - but my 8 year old HP 48G+ seems dead

I was working away when I got a message "Do you want to recover Data?" I said no and the screen went black. I move the batteries around and I can get it to repeat the same message before the screen blackens again. Any ideas?

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  • Trog16 Apr 09, 2008

    I get the message "Would you like to recover the memory?" and if I hit no or yes I get a black screen. I have removed the batteries, and let the calc sit, I have changed the batteries, all to no avail. Hope to get this working again.

    Love the calc,

  • johnsonch Feb 11, 2009

    I have a similar problem. My GX locked up. None of the keys produced a change on the display. I replaced the batteries and the screen went black except for a couple rows of pixels right in the center. And still, the keys are all non-functional (they do nothing)



    Anyone out there have a clue on how to remedy this?

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Flip your GX over. Remove the rubber foot in the upper right corner to find the reset hole. Insert a standard paperclip and hold it there for a minimum of 2 seconds. Flip 'er back over, hit "on" and you should be back in business. You may be promped to "recover data". I didn't have anything I wanted saved, so I just said selected no.

Good luck.

Posted on Feb 11, 2009

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Of course EVERY foot has a hole under it ... only one has an 'R' ... rofl. I was on my way to get the hammer when I thought of the internet!

Posted on Aug 03, 2010

  • CEAI Apr 04, 2011

    Khe-Sanh-Vet ... it's 2011-04-04 ... and today I used your suggestion to fix my HP48GX calculator ... IT WORKED GREAT .... As a further comment I wanted to express a solemn Henry V "Band of Brothers" thanks to you, especially for your service and sacrifice during the Seige of Khe Sanh ... where you and your comardes broke the back of the N.V.A. ... well done, Soldier ! CEAI@Engineering-Excellence.US ...

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Johnsonch was right on the money!!! Thanks! You just saved me $100 or whatever hp48g's are going for.

Posted on Apr 29, 2009

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Posted on Jan 02, 2017

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No plug in play... don't think their dead... do I need drives first?


no country stated or if not usa what is your line power?(volts AC)
your PSU is inside monitor not outside, so uses a simple line power cord. (just wires)
12 year old monitors, found, (dead)
page one of your user guide is clear, read it yet?
seems not.,
Auto-ranging, 90 to 265 VAC
1280 x 1024 @ 60 Hz, 75 Hz (never higher) resolution settings.
those are very old monitors.. worth like $10 used.
if the power lamp shows wrong, the monitor is dead.
right button is power to the right of it is a power led that must glow.
the old monitors had CCFL backlamps before year 2010.
those are back lamps, that fail fast. 20k hours, fast. (short)
first is the power switch
2nd is a working PC with at least sync signals on 2 pins
Horz/vertical.
then the OSD screens work of not the monitor IS DEAD.
inside this OLD monitor is sleep time, turn if off with OSD menu's its nothing but trouble.
some have an OSD lock, so hold the menu key for 10 seconds
and it unlocks. button 2 from left is MENU.
see page 4-10
the guide is here. not too good , poor diagnosis sections
http://h10032.www1.hp.com/ctg/Manual/c00276671



specs.
https://support.hp.com/us-en/product/hp-l1940-lcd-flat-panel-monitor/427303/document/c00278650#AbT3


testing
power it on, LED power , glows.
with a PC working, say running any BIOS screen only....
or running, windows, in low resolution mode 1280 x 1024
if wise set the pc up to that first. not second.
then plug in the vga cable so the MOnitor only sees that signal above. (if you do above wrong, monitor shows OUT OF RANGE on the screen)

at mon.
PUSH the OSD button, menu, if OSD is dead the montor is dead.
OSD= on screen display., (yes the LDC has brain inside)
then take a flash light . point it at screen
see data now, if yes, in the beam is data the back lamp is dead
as are most 12 years old montors now.

see those 4 cream colored connectors bottom of this PCB
those are the high voltage CCFL lamps.
2 lamps 4 ends. the lamps are bad or the board 500 to 1000vdc
power supply is dead.





1940-owkjznuqojna0gup3jqh3ggp-2-0.jpeg

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