LAPTOP NO POWER, goes back to life when CMOS batt removed

[gnawhalak]

Help!

Im trying to fix an acer 3620 laptop.

SYMPTOMS:

No power, no lights, nothing.


Diagnosis:

Power adaptor/jack -- ok

Opened to motherboard level.

when i removed the CMOS battery, laptop boots normally.
when i connected back the CMOS battery, first boot is ok. when i remove power jack and plug it back. again, no more power, no lights..



I suspected a bad BIOS... tried resetting the cmos a couple of times already, even doing the power drain (turning off and pressing power for 20s) but to no success...

Any help would be greatly appreciated... thanks!

[Jeffreynya]

Have you tried another battery?

[Knightsman]

sounds like bad battery to me...

[wtigger]

Interesting that a CMOS battery in a laptop would cause those symptoms. I haven't ever seen desktops with dead CMOS batteries cause any issues other than time/date warnings on bootup.

I have a few candidates I can try this on, I have a few dead laptops now

[gnawhalak]

oops.. sorry.. i forgot to add on my original post..

yes.. i did try replacing the cmos battery in the laptop.. tested with a voltmeter and got a reading of around 3VDC..

so, cmos battery seems ok to me..

thnx jeff, knights, n tigger..


this one is really strange.. first time I encountered this..

[Knightsman]

Originally Posted by wtigger

Interesting that a CMOS battery in a laptop would cause those symptoms. I haven't ever seen desktops with dead CMOS batteries cause any issues other than time/date warnings on bootup.

I have a few candidates I can try this on, I have a few dead laptops now

Anytime ive tried to make it happen, it doesn't. this is a rare occurrence.

But def something to look out for.

Originally Posted by gnawhalak

oops.. sorry.. i forgot to add on my original post..

yes.. i did try replacing the cmos battery in the laptop.. tested with a voltmeter and got a reading of around 3VDC..

so, cmos battery seems ok to me..

thnx jeff, knights, n tigger..


this one is really strange.. first time I encountered this..

hmm, in that case, I would say yes a bad bios, I would download the latest one and reflash it. Post here if that fixes the problem.

[gnawhalak]

so its really quite possible for a bad bios to cause dead laptop/no power...

coz im thinking it could be something else, as a thought that with a bad bios, there will just be no POST, but there should still be power on the board..

hmm.. will look into the possibility of flashing this one.. would just have to let the owner know of the risk first.. if he agrees..

[Jeffreynya]

How does it run on just laptop battery? Have you tried another power adapter? Agree though, this is quite strange. Let us know how the BIOS upgrade goes.

[Knightsman]

Originally Posted by gnawhalak

so its really quite possible for a bad bios to cause dead laptop/no power...

coz im thinking it could be something else, as a thought that with a bad bios, there will just be no POST, but there should still be power on the board..

hmm.. will look into the possibility of flashing this one.. would just have to let the owner know of the risk first.. if he agrees..

Anything is possible with computers these days.

[PaulRome]

Give this read. Hopefully it helps.

http://vip.asus.com/forum/view.aspx?...Language=en-us

Best of luck