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#1
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cmos battery
i was testing a machine that would run ok for about ten minutes...
then just plain shut down. the cpu was running cool, so it was not an over-temp situation after trying the mobo with all different components (ram, video etc) and confirming the cpu was good (in another machine) i finally concluded the mobo was just plain bad but with nothing else left to check...i found the cmos battery at about 1.7 volts... replaced it with a good one...and much to my surprise it's been running fine for over an hour now... seems weird to me... but that's what happend philo |
#2
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philo wrote: i was testing a machine that would run ok for about ten minutes... then just plain shut down. the cpu was running cool, so it was not an over-temp situation after trying the mobo with all different components (ram, video etc) and confirming the cpu was good (in another machine) i finally concluded the mobo was just plain bad but with nothing else left to check...i found the cmos battery at about 1.7 volts... replaced it with a good one...and much to my surprise it's been running fine for over an hour now... seems weird to me... but that's what happend philo There are a few computers (PBell comes to mind) that will not boot if the CMOS battery is too low. Most will simply lose their settings or time on the RTC if too low. You might have been on the ragged edge of a computer that is similar to the Packard Bell I cited. |
#3
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There are a few computers (PBell comes to mind) that will not boot if the CMOS battery is too low. Most will simply lose their settings or time on the RTC if too low. You might have been on the ragged edge of a computer that is similar to the Packard Bell I cited. it's an odd one... i don't know if the cmos could have been put in some non-logical state... but so far the thing is still running... guess i'll let it sit overnight and see what happens |
#4
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You may have had a BIOS conflict of sorts. When you pulled the battery, you reset the BIOS to the default...which resolved the conflict problem. Just guessing, of course. sounds like a possibility P.S. Its been my experience that a battery's voltage doesn't change that much as it gets weaker. Was it a standard battery? yes, it was a standard "button" type , 3 volt battery but it was down to 1.7 volts which was probably right on the edge of beging able to hold the settings... at any rate the board is working ok now and i have another board that was in my junk pile for the same symptoms which also had a cmos battery at about 1.7 volts... so as soon as i can find a cpu for it...will put in a new battery and give it another try |
#5
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Trent© wrote: On Sun, 09 May 2004 19:04:51 GMT, lid wrote: There are a few computers (PBell comes to mind) that will not boot if the CMOS battery is too low. Do you have any model numbers? I've worked on a lot of PB's...but never ran across what you said above. Have a nice week... Trent© Follow Joan Rivers' example --- get pre-embalmed! Sorry, I do not have the model numbers, but I think it was a 386 or 486 vintage. I recall from the literature that this was the case, and in fact it WAS the case on the one I was installing. Although the first new computer I owned was a PB, they were not conducive to upgrade or repair. I tried to stay away from them except when the problems were very minor. |
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