Laptop Problem

0 views
Skip to first unread message

Pops

unread,
May 31, 2003, 10:31:41 PM5/31/03
to
I have been working on a laptop that I suspect has a bad power supply. The
laptop has been back to the service center 2 times to replace the internal
power/battery circuit. I checked the voltage output on the power supply
adapter and it was about 16.4 volts. The laptop requires 19.

My question is. Can low voltage cause damage to a laptop? Anybody have any
experience with this type of problem?

Pops
A+

ghaouf

unread,
May 31, 2003, 11:28:30 PM5/31/03
to

low voltage cannot cause damage but would just make the laptop not work
did you try a different cable
you know that the laptop's power supply is the cable and not actualy
inside the PC right.

---
View this thread: http://www.examnotes.net/article1011947.html
ghaouf - A CERT MARATHON PC GEEK

------------------------------------------------------------------------
ghaouf's Profile: http://www.examnotes.net/forums/member.php?action=getinfo&userid=165187

Tolkien Reader

unread,
Jun 1, 2003, 8:06:37 AM6/1/03
to
I've seen a bad battery cause this type of problem. Do you know if the
battery itself is still good? Does the laptop have problems when running on
just battery and not the adapter. If no problems when on battery, then I
think you are right, get a new AC adapter.


"Pops" <whst...@yahoo.com> wrote in message
news:MndCa.31984$Rg2....@fe02.atl2.webusenet.com...

Pops

unread,
Jun 1, 2003, 8:53:18 AM6/1/03
to
This particular laptop is a new Fujitsu 2210 and is installed in a roll
around cart in a hospital emergency room. It is powered by an external
12volt UPS with a in-line transformer that is supposed to provide 19 volts
for the the laptop. I checked the voltage and it is only providing 16.4
volts. We are not using the power supply that shipped with the laptop but
I have used it for testing and I know it is good.

Also it runs fine off the internal battery (which is also good) but the
none of the power supplies will not charge the battery nor will they run the
the laptop by itself without the battery. The laptop doesn't even know that
there is a power supply adapter attached.

I am a pc tech but I don't have experience working on laptops. I can load
them all day long and help users with their problems but this one is over my
head. But it seems that somewhere in the back of my mind I have heard that
low voltage for laptops can be deadly and that they do not react the same as
a regular pc.

Thanks again.

Pops


"Pops" <whst...@yahoo.com> wrote in message
news:MndCa.31984$Rg2....@fe02.atl2.webusenet.com...

Ray

unread,
Jun 1, 2003, 10:58:19 AM6/1/03
to
Hi Pops:

The 2210 battery is only rated at 14.4 volts

The power supply to charge it puts out 19 volts. Chargers normally put
out more than the battery voltage.

If the ups is putting out 16.4 volts that should more than satisfy the
14.4 volt requirement that your battery normally provides to the system.

I suspect that there may be a problem with your UPS. Is this something
that someone cobbled up or is it something that is actually supposed to
work with you notebook? If it was sold as an alternative power source
for your notebook get with the UPS manufacturer. If as you stated "The
laptop doesn't even know that there is a power supply adapter attached",
then I would suspect that there is some kind of problem with the adapter
plug since you claim the the UPS is putting out 16.4 volts - that should
run the notebook.

Ray

Jesse Meyer

unread,
Jun 1, 2003, 6:03:37 PM6/1/03
to

I can't think of anyway low voltage would hurt hardware. OTOH, low
voltage might cause some weird things to happen in the processor, and
result in OS and program errors, corrupting data, etc.

Just my two cents,

Jesse Meyer

--
...crying "Tekeli-li! Tekeli-li!"... ~ HPL
icq : 34583382 | === ascii ribbon campaign ===
msn : das...@hotmail.com | () - against html mail
yim : tsunad | /\ - against proprietary attachments

Ray

unread,
Jun 1, 2003, 7:09:45 PM6/1/03
to
Yes, Low voltage on a steady diet could be detrimental. Low voltage
could equal a slower cooling fan speed (Sizzle) but the same would be
true with your battery. Voltsge drops of as it discharges. I am sure
that Fujitsu? has low voltage protection built into their board. But,
as I said before, you have 16.4 out of the UPS and only 14.4 are required.

Ray

Pops

unread,
Jun 1, 2003, 7:47:43 PM6/1/03
to
These posts have really been helpful and I appreciate everyones input. I
posted the same message on the A Plus newsgroup and no one's touched it yet.
This project got thrown in my lap when another tech got fired.

The roll around cart that the laptop is in is part of a package that came
from Stinger Industries. We have a total of 4 of them and only 1 is bad,
and hasn't worked from day one. I called Stinger on Friday and they told
me that we had the wrong transformers and they would ship another. What
puzzels me is that we have 3 others with the wrong transformer and they are
working fine.

I have removed the laptop from the cart and have tried to use the regular
power supply adapter and it won't power it up either so what ever damage
there is was done was while it was attached to cart's UPS power supply.
As a matter of fact it happend within a few minitues of plugging it up.

I am about ready to trash the whole cart and hide it in the basement and get
me a Dell and put it on a little red wagon with an extention cord. But I
appreciate all the help. At least I have some ammunition when I meet with
the Boss on Monday.

Thanks

Pops
A+ and wannabe MCP


"Jesse Meyer" <me...@btinet.net> wrote in message
news:p7tdbb...@10.0.0.1...

Phil

unread,
Jun 2, 2003, 7:53:16 AM6/2/03
to
Ray <ray....@verizon.net> wrote in message news:<3EDA8823...@verizon.net>...

I think that Ray needs to go and have some physics lessons. A battery
rated at 14.4 volts will not charge properly from a 14.4 volt supply.

To Jesse Did you check the voltage open circuit or on load cause an
open circuit ckeck means sod all.

HTH PHIL NImbus
> >

Ray

unread,
Jun 2, 2003, 8:07:03 PM6/2/03
to
Phil:

I do not flame others and do not expect it in return either but I think
that you need to go read what I said more carefully. I was probably
working with electronics when you were in diapers but based on your
comment, it looks like you need a fifth grade remedial reading course.

Ray

Pops

unread,
Jun 3, 2003, 8:03:28 AM6/3/03
to
I think I found the problem. The laptop is being powered by a universal
cable that has swapable conectors on the ends so it can be used for
different applications. During the original setup someone reversed one of
the ends and the polarity changed. So the laptop was getting 16v dc on the
ground side and it zapped the internal power circuit.

Wish I had checked all this a long time ago before I ruined messed up so
many laptops.

Thanks again.

Pops


"Pops" <whst...@yahoo.com> wrote in message

news:H7wCa.37624$L75....@fe05.atl2.webusenet.com...

Phil

unread,
Jun 3, 2003, 7:32:11 PM6/3/03
to
"Pops" <whst...@yahoo.com> wrote in
news:g%%Ca.73353$L75....@fe05.atl2.webusenet.com:

> I think I found the problem. The laptop is being powered by a
> universal cable that has swapable conectors on the ends so it can be
> used for different applications. During the original setup someone
> reversed one of the ends and the polarity changed. So the laptop was
> getting 16v dc on the ground side and it zapped the internal power
> circuit.

Glad to see you've gotten to the bottem of this. I've been watching this
thread, since I am net admin for a hospital with a very similar ER setup.

--
Phil M.
MCSE - NT4/2000

Ray

unread,
Jun 4, 2003, 7:13:40 AM6/4/03
to
Phil:

Not to rub it in, but....

Tell me, Phil, when I said "then I would suspect that there is some kind

of problem with the adapter plug since you claim the the UPS is putting

out 16.4 volts - that should run the notebook", was I wrong?

Ray

Reply all
Reply to author
Forward
0 new messages