Location of CMOS Battery in HP Pavilion N3390 Laptop

Hi,

This HP Pavilion N3390 laptop is over 10 years old.

I have replaced the RTC/CMOS batteries on some of my
old laptops, and it is a big help if I know in advance the location
of that battery.

I failed to find the location of this battery on the web for my HP
Pavilion N3390 laptop. Note: I was ripped off at www.eservicemanual.info
when I was misled with their claim to have a service manual. What I paid
for turned out to be a user manual (I already have). Of course there is
no information on the CMOS battery in the user manual.

I will be very grateful to anyone who can tell me the location of the
CMOS battery.

Thank You in advance, John

wrote:
Hi,

This HP Pavilion N3390 laptop is over 10 years old.

I have replaced the RTC/CMOS batteries on some of my
old laptops, and it is a big help if I know in advance the location
of that battery.

I failed to find the location of this battery on the web for my HP
Pavilion N3390 laptop. Note: I was ripped off at www.eservicemanual.info
when I was misled with their claim to have a service manual. What I paid
for turned out to be a user manual (I already have). Of course there is
no information on the CMOS battery in the user manual.

I will be very grateful to anyone who can tell me the location of the
CMOS battery.

Thank You in advance, John


No sign of a two pin header, for a twisted cable and battery
in shrink wrap tubing here. This is all I could find in terms
of pictures.

http://www.notebookpartsrepair.com/H...otherboard.jpg

http://www.notebookpartsrepair.com/H...odem_Board.jpg

Paul

"jaugustine" wrote:

Hi,

This HP Pavilion N3390 laptop is over 10 years old.

I have replaced the RTC/CMOS batteries on some of my
old laptops, and it is a big help if I know in advance the location
of that battery.

I failed to find the location of this battery on the web for my HP
Pavilion N3390 laptop. Note: I was ripped off at www.eservicemanual.info
when I was misled with their claim to have a service manual. What I paid
for turned out to be a user manual (I already have). Of course there is
no information on the CMOS battery in the user manual.

I will be very grateful to anyone who can tell me the location of the
CMOS battery.

Thank You in advance, John

Digging for different answers than you already got for the SAME question
you started 5 days ago in another thread in the windowsxp.general group
(instead of posting there to continue the discussion)? Just because you
don't want to dismantle the laptop get underneath the mobo (well, on top
of it since the access panels are on the bottom of the case) doesn't
obviate that's what you have to do.

Sometimes a laptop maker will provide service manuals. These tell you
how to dismantle the case and remove components, like how to replace the
keyboard (the disassembly for which is what you might have to go through
to get at the other side of the mobo). Again, Dell should be able to
tell you if they used a [coin cell] battery, capacitor, separate IC, or
RTC with in-built capacitor to supply power to CMOS to maintain the
settings saved there.

http://h10025.www1.hp.com/ewfrf/wc/m...roduc t=61774

Didn't see any service manuals there. Maybe you could call Dell support
and ask for the "Maintenance and Service Manual" for this model. They
might charge for shipping and maybe even some for the manual itself;
however, you could check before ordering if it does indeed describe and
illustrate the servicing procedures for that model (and isn't just
another copy of the "user manual" that comes with the product).

Forum:
http://h10025.www1.hp.com/ewfrf/wc/d...&product=61774

has a link to "Adding/Replacing Hardware" but the couple articles there
show access through the bottom plates (the normal access methods for
user upgrades).

You might something over in the HP forums:

http://h30434.www3.hp.com/t5/Hardwar.../bd-p/Upgrades

A service manual for a different netbook at:

http://h30434.www3.hp.com/t5/Hardwar...ght/true#M8621

page 6-51, shows the CMOS battery is on the top of the mobo (not on the
bottom side using the access panels) and sits vertically in a slot in
the plastic of the case. In fact, it looks like you don't just swap in
a CR2032 common coin cell battery but have to get one with leads and
connector attached to it. I suppose you could do some soldering to use
a coin cell you buy in a store. The service manual for the dv6000 at
http://h10032.www1.hp.com/ctg/Manual/c01035677.pdf shows the CMOS
battery is under the memory access plate. Maybe you're looking for a
coin cell slid into a metal retaining bracket, like in desktops;
however, this also shows a replacement that has soldered leads and a
connector so, if this was the case for you, then maybe you wouldn't
recognize it as the CMOS battery.

Without you disassembling the case to go look for the CMOS battery, I
suspect Dell is your best source on where to find it, how to dismantle
to get at it, and what you need to replace it (might not be a simple
swap of a coin cell from the local store).

It's also possible there is no CMOS "battery" that you see. They could
use a capacitor to do the same thing: provide voltage when the unit is
otherwise powered off. The "battery" may be a soldered-on IC on the
mobo:

http://www.cymbet.com/products/enerc...-batteries.php

or the battery/capacitor might be inside the RTC chip. That means there
is no user-replaceable battery for CMOS.