Subj : Re: Clock Battery No boot
To   : Dennisk
From : Moondog
Date : Thu Jun 18 2020 10:49:00

  Re: Re: Clock Battery No boot
  By: Dennisk to paulie420 on Wed Jun 17 2020 08:57 pm

 > -=> paulie420 wrote to Ogg <=-
 > 
 >  pa>   Re: Re: Clock Battery No boot
 >  pa>   By: Ogg to HusTler on Sun Jun 14 2020 08:55 am
 > 
 >  >> ...One suggestion was to replace the clock battery on the mother
 >  >> board. So he spent the 6 bucks for the battery and it worked! The
 >  >> machine boot right up and is working fine. Anyone ever have this
 >  >> happen?
 > 
 >  Og> I had about two old pcs that behaved that way by virtue of a dead or
 >  Og> undervolt onboard battery.
 > 
 >  pa> Well, I have one ole laptop I might check then. :P I thought it was
 >  pa> surely the power supply (luckily a daughter board for thinkpads...);
 >  pa> but before I go digging into another ThinkPad to pull that peice, I'm
 >  pa> going to check the clock....
 > 
 >  pa> I remember when i was disassembling, that dam clock battery wouldn't
 >  pa> unplug and I kinda yanked hard to get that sucker out of there. Since
 >  pa> two of you described this situation, I hope to gosh that its just the
 >  pa> battery. Don't think so, but I'll be posting a thank you to Hustler and
 >  pa> you if so!!! :P
 > 
 > I have a 486 motherboard that won't start at all (thought it well beep if th
 > is no RAM installed).  No video.  I've been told that perhaps its something 
 > simple as the battery, which may be the case as I've tried changing the RAM,
 > CPU, etc.
 > 
 > I take it though, that the board won't start up until a new battery is put i
 > place?  Or is removing the dead battery enough to get it started?
 > 
 > 
 > ... Dennis Katsonis

Yes and no.  Sorry about the ambiguity.  A bad cell could short out or
provide a bit of voltage that prevents the BIOs from being preserved or the
settings are corrupted.  Pulling a battery could clear those settings, allow
for any capacitors or volatile memory to clear.  You can also search for a
clear cmos jumper on a board, which will short out settings so they could be
reset.  A new battery may be essential to maintaining or stabilizng CMOS
settings.

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