- CMOS battery and low voltages on the battery plug
- Posted by zipeppe@gmail.com on March 8th, 2008
Hi guys,
opened a nb HP ze4354EA to find the CMOS battery to replace but...
where is it?
It's completely opened now, I have the mobo on my desk and only the
CPU and heat-pipe still there.
I am unable to find something similar to the battery pill for desktop
mobo.
It also strange to me that on the power connector I can read +18Vcc
from the power supply, but on the battery connector only +5V is
present. Is this normal?
Any help would be appreciated!
ZpP
- Posted by BillW50 on March 8th, 2008
In
news:392711b1-4f68-44be-a6ed-83117caf0171@y77g2000hsy.googlegroups.com,
zipeppe@gmail.com typed on Sat, 8 Mar 2008 15:13:55 -0800 (PST):
I just answered your other post on what it could look like. And 5v? Is
that without the main battery installed? If so, yes that would be
normal. If you are reading this with the main battery installed, no that
isn't normal.
--
Bill
- Posted by zipeppe@gmail.com on March 9th, 2008
On 9 Mar, 01:24, "BillW50" <Bill...@aol.kom> wrote:
Hi Bill, nice to meet you again!
I'm sorry but that answer you're talking about was no so clear for me.
In fact I'm looking for something similar to the one we find on
desktop mobo and so maybe I'm wrong.
There are nor soldered battery (so far as I saw), neither Dallas/ST/
Ami/Award chips around.
What I have to look for?
5V without battery of course. Why it has to be normal, please?
Cheers,
ZioPeppe
- Posted by BillW50 on March 9th, 2008
In
news:bbf18b19-1e44-4205-a5cb-1580b99a012d@y77g2000hsy.googlegroups.com,
zipeppe@gmail.com typed on Sun, 9 Mar 2008 03:25:50 -0700 (PDT):
Well generally speaking, something with two wires on it. It can be disc
shaped, rectangular, tubular, etc. Some are plugged into the motherboard
and some are soldered in.
It is normal without the main battery because the system doesn't detect
a battery installed. So the voltage is usually low sitting there. And 5V
is pretty common. It should pop back up once the system detects a
working battery once again.
--
Bill
- Posted by zipeppe@gmail.com on March 9th, 2008
On 9 Mar, 13:01, "BillW50" <Bill...@aol.kom> wrote:
I see. Thanks so much for your clear explanation. Ok, I will have
another look for the battery.
- Posted by Dave Martindale on March 11th, 2008
zipeppe@gmail.com writes:
It's possible that the battery charging electronics wants to have a
"chat" with the battery electronics before starting to charge the
battery. If so, the line used to exchange data with the battery's
microcontroller may be "live" (that may be the 5 V you see), while the
main battery connection terminals remain shut off. Once you've
installed a battery and charging is underway, you should see a voltage
somewhat higher than battery voltage on the charging terminals.
Dave
- Posted by zipeppe@gmail.com on March 11th, 2008
On 11 Mar, 06:33, da...@cs.ubc.ca (Dave Martindale) wrote:
Yes, now it's clear.
Tnx Dave!
