I had the same issue some years ago after I opened my 48g.
The reason would be in yur case that the main board is not making
contact properly with the keayboard. The signal of the keys is
introduced to the main board right below the screen
Try turning it on but pressing the metal cover just above the the "C"
key. (In fact, it worked better for my between the "B" and "C" keys)
If it works, the problem is that the main PCB might have loosen. You
can 1) Get used turning it on and off that way (althow you might
program another button for the off function) 2) Hit it hard by a side
with your hands hoping luck fix it (it worked to me in some 49Gs when
the screen became crazy) 3) Try open it and tighten the board again.
I recomend #1
Edwin
On Sunday, September 3, 2006 at 9:39:51 PM UTC-4, Edwin Mendoza wrote:
I had the same issue some years ago after I opened my 48g.
The reason would be in yur case that the main board is not making
contact properly with the keayboard. The signal of the keys is
introduced to the main board right below the screen
Try turning it on but pressing the metal cover just above the the "C"
key. (In fact, it worked better for my between the "B" and "C" keys)
If it works, the problem is that the main PCB might have loosen. You
can 1) Get used turning it on and off that way (althow you might
program another button for the off function) 2) Hit it hard by a side
with your hands hoping luck fix it (it worked to me in some 49Gs when
the screen became crazy) 3) Try open it and tighten the board again.
I recomend #1
Edwin
#1 is BRILLIANT! Thanks!
I have a HP 48GX with an ON key problem. When I try to turn the calculator on or off as normal the key does not work. When I use ON+C the on button works perfectly. I have no way to turn the calculator
off except waiting for it to time our or remove the batteries. Any suggestions as to repairing this are appreciated. Jon
Hello,
(if your GX is old enough or if it was exposed to fine dust :-)
you may have the problem i had with old SX !
Just about under first row of keys there are contacts which connect your calculator motherboard with keyboard PCB.
(that's why it seems to be working when you press ON-C you press the
keyboard PCB so it gets slightly closer to MBRD -that's why it seems to be working in that case)
These contacts are just touching eachother making contact that's why this is sensitive to dust.
note: if that's the case it will not get better, it will get worse and more anoying so consider following...
possible fix :
take your GX apart, try to blow away the dust with highly compressed air, (use high preassure so you won't move the dust around, you would rather blow it out and away)
in case this doesn't fix the issue go further: separate keyboard PCB from motherboard and clean properly
I don't recommend this if you're not experienced in taking things apart and puting them back tougether (without permanent damage :-)
manjo
I have a HP 48GX with an ON key problem. When I try to turn the
calculator on or off as normal the key does not work. When I use ON+C
the on button works perfectly. I have no way to turn the calculator
off except waiting for it to time our or remove the batteries. Any suggestions as to repairing this are appreciated. Jon
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