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- The Buzz
October 30, 2007, 8:03 pm
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I'm experiencing a problem with my computer's clock (both in the bios and in
The clocks just stops when the laptop is completely diconnected from the
power (with no battery).
The clock starts running again from the point where it stopped after I plug
I think it started from the change from legal to solar time, but i'm not
sure about this.
The computer is a HP pavilion dv6000 laptop, with amd turion 64 x2
processor, bought in january 2007.
Can anyone help me please?
ps: i've updated the bios to the latest version released on the hp website,
but nothing changed.
Re: computer clock problems
There is a laptop disassembly demonstrated here:
This picture, shows a CMOS battery in a plastic sleeve, then joined
with a couple wires to a LED status subassembly PCB. The purpose of the
turquoise plastic sleeve, is to insulate the battery when it is sitting
inside the laptop. I guess there isn't room for a proper battery socket.
I doubt very much, that total disassembly is needed to get at that battery.
It is possible the battery is accessible from a bay in the bottom of the laptop.
So have a look in any bays in the laptop, to see if the tiny CMOS battery is
The CMOS battery is used, when other sources of power are not available.
So if the main battery pack is removed, and AC power is not available, the
CMOS battery runs the clock. Note that, if you store a laptop, with no
power available to it, the CMOS RTC tiny battery will only last for two
or three years, before being exhausted (just like a digital watch would).
For long term storage, you'd record all BIOS settings, shutdown, and unplug the
RTC battery before putting it away in a cool dry place. That way, you'd avoid
a nasty surprise three years later, when the clock stops and all BIOS settings
reset themselves. Plug in the tiny battery again, apply AC, enter the BIOS,
and restore the settings as recorded on your piece of paper.
OK. Fired up the search engine, and got a manual for your laptop on the
very first link. The CMOS battery is shown here. It consists of a battery
inside an insulating plastic sleeve, two wires, and a mini connector on
the end. Thus, it is not as convenient as the battery on a desktop, where
you just go to Radio Shack and get a new CR2032. I expect you'd still have
to go to HP and get this subassembly, complete with mini connector on the
end. See PDF page 131. You'll need an HP "RTC battery spare parts kit",
whatever that is.
If you wanted to "adapt" a Radio Shack battery, to fit in the laptop,
without contacting HP, I expect the battery wires are spot welded
to the battery. Soldering wires onto the battery, is not the same thing.
A carefully done spot weld, probably doesn't heat up the metal that much.
But soldering could cause the battery to burst. I don't know if there
are any decent battery sockets that could be strung on the end of the
wires, to hold a battery in place. And in any case, there is probably
not a lot of extra room for such a kludge anyway. So you probably
want to get the proper replacement part.
Since you bought the unit in Jan 2007, you likely have a warranty. If
the service is local to you, you could have them order the "RTC battery
spare parts kit", and when it comes in, it should take 5 minutes at the
counter to change it out, under warranty.
I don't know of another good reason for the clock to stop. If the
laptop had been dropped on the floor, well, that would be different.
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