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#1
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ending up in bios
I recently replaced the coin cell on my mainboard because, when booting the
PC, I often ended up in the bios setup. For some time things were OK, but now and then I'm having the same symptom again. Would this coin cell (5 euro!) be exhausted again?! -- regards, |\ /| | \/ |@rk \../ \/os |
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#2
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ending up in bios
Perhaps you purchased a battery that had remained on the shelf for a
long period of time? Linea Recta wrote: I recently replaced the coin cell on my mainboard because, when booting the PC, I often ended up in the bios setup. For some time things were OK, but now and then I'm having the same symptom again. Would this coin cell (5 euro!) be exhausted again?! |
#3
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ending up in bios
Perhaps you purchased a battery that had remained on the shelf for a
long period of time? Linea Recta wrote: I recently replaced the coin cell on my mainboard because, when booting the PC, I often ended up in the bios setup. For some time things were OK, but now and then I'm having the same symptom again. Would this coin cell (5 euro!) be exhausted again?! |
#4
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ending up in bios
Linea Recta wrote:
I recently replaced the coin cell on my mainboard because, when booting the PC, I often ended up in the bios setup. For some time things were OK, but now and then I'm having the same symptom again. Would this coin cell (5 euro!) be exhausted again?! You can measure the voltage on the coin cell, while it is in circuit. To do so, connect the black lead of the multimeter to some shiny metal on the case. I use an alligator clip and clip the meter lead to an I/O screw in the I/O area on the back of the computer. The benefit of doing this, is only having to handle the red meter probe while making readings. Set the meter to "volts" and make sure to use the pair of holes on the meter intended for "volts/ohms" readings. The nice shiny surface of the cell, with the "+" on it, makes an easy target to touch with the red multimeter probe. So you don't need to remove the battery to check it. The CMOS coin cell (CR2032) should be 3.0V when new. Below about 2.4V, the board won't be getting enough voltage to guarantee correct CMOS settings storage or RTC clock operation. Replace the battery if it is below 2.4V. The "knee" of the discharge curve is sharp enough, that in a matter of days, it'll be at a much lower voltage. So once it decides its time is up, it will relatively rapidly discharge towards zero. The CR2032 could last anywhere from 3 years to the shelf life of the battery (10 years?) depending on the user's computer usage pattern. Switching off the power supply at the back, after each working day, heads you in the "3 year life" direction. The computer does not charge that battery. Neither should you try to charge it. The CR2032 is not designed to be charged. Paul |
#5
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ending up in bios
Linea Recta wrote:
I recently replaced the coin cell on my mainboard because, when booting the PC, I often ended up in the bios setup. For some time things were OK, but now and then I'm having the same symptom again. Would this coin cell (5 euro!) be exhausted again?! You can measure the voltage on the coin cell, while it is in circuit. To do so, connect the black lead of the multimeter to some shiny metal on the case. I use an alligator clip and clip the meter lead to an I/O screw in the I/O area on the back of the computer. The benefit of doing this, is only having to handle the red meter probe while making readings. Set the meter to "volts" and make sure to use the pair of holes on the meter intended for "volts/ohms" readings. The nice shiny surface of the cell, with the "+" on it, makes an easy target to touch with the red multimeter probe. So you don't need to remove the battery to check it. The CMOS coin cell (CR2032) should be 3.0V when new. Below about 2.4V, the board won't be getting enough voltage to guarantee correct CMOS settings storage or RTC clock operation. Replace the battery if it is below 2.4V. The "knee" of the discharge curve is sharp enough, that in a matter of days, it'll be at a much lower voltage. So once it decides its time is up, it will relatively rapidly discharge towards zero. The CR2032 could last anywhere from 3 years to the shelf life of the battery (10 years?) depending on the user's computer usage pattern. Switching off the power supply at the back, after each working day, heads you in the "3 year life" direction. The computer does not charge that battery. Neither should you try to charge it. The CR2032 is not designed to be charged. Paul |
#6
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ending up in bios
Linea Recta wrote:
I recently replaced the coin cell on my mainboard because, when booting the PC, I often ended up in the bios setup. For some time things were OK, but now and then I'm having the same symptom again. Would this coin cell (5 euro!) be exhausted again?! It's possible that you put in a weak new battery. More likely is that you did not reset the BIOS after replacing the battery, especially when you did so to replace a dead or weak battery (i.e., you waited until you had to replace the battery, not by replacing it before it was needed). The BIOS in EEPROM gets copied into CMOS. The battery keeps alive the CMOS copy. If the battery gets too weak, it is possible the settings get corrupted in the CMOS copy. You put in a new battery but that merely provides the power to keep alive whatever settings are currently in the CMOS table. If the settings are wrong, they'll still be wrong after you put in a new battery. Record any modified settings in the BIOS. Replace the battery. Reset the BIOS (how depends on what you have which was never mentioned). This copies the hard copy of the settings from the EEPROM for the BIOS into the CMOS table. Then re-input your modified settings (there are some utilities to save the BIOS settings but often that takes more work than just recording the few that you changed and restoring them after the CMOS reset). |
#7
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ending up in bios
Linea Recta wrote:
I recently replaced the coin cell on my mainboard because, when booting the PC, I often ended up in the bios setup. For some time things were OK, but now and then I'm having the same symptom again. Would this coin cell (5 euro!) be exhausted again?! It's possible that you put in a weak new battery. More likely is that you did not reset the BIOS after replacing the battery, especially when you did so to replace a dead or weak battery (i.e., you waited until you had to replace the battery, not by replacing it before it was needed). The BIOS in EEPROM gets copied into CMOS. The battery keeps alive the CMOS copy. If the battery gets too weak, it is possible the settings get corrupted in the CMOS copy. You put in a new battery but that merely provides the power to keep alive whatever settings are currently in the CMOS table. If the settings are wrong, they'll still be wrong after you put in a new battery. Record any modified settings in the BIOS. Replace the battery. Reset the BIOS (how depends on what you have which was never mentioned). This copies the hard copy of the settings from the EEPROM for the BIOS into the CMOS table. Then re-input your modified settings (there are some utilities to save the BIOS settings but often that takes more work than just recording the few that you changed and restoring them after the CMOS reset). |
#8
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ending up in bios
"VanguardLH" schreef in bericht
... Linea Recta wrote: I recently replaced the coin cell on my mainboard because, when booting the PC, I often ended up in the bios setup. For some time things were OK, but now and then I'm having the same symptom again. Would this coin cell (5 euro!) be exhausted again?! It's possible that you put in a weak new battery. More likely is that you did not reset the BIOS after replacing the battery, especially when you did so to replace a dead or weak battery (i.e., you waited until you had to replace the battery, not by replacing it before it was needed). Your reply might be relevant in this case. Indeed, I have not reset the bios. I remember the wrapping of the battery had a date of several years in future. However, I have to point out that the flaw is incidental... The BIOS in EEPROM gets copied into CMOS. The battery keeps alive the CMOS copy. If the battery gets too weak, it is possible the settings get corrupted in the CMOS copy. You put in a new battery but that merely provides the power to keep alive whatever settings are currently in the CMOS table. If the settings are wrong, they'll still be wrong after you put in a new battery. Record any modified settings in the BIOS. Replace the battery. Reset the BIOS (how depends on what you have which was never mentioned). This copies the hard copy of the settings from the EEPROM for the BIOS into the CMOS table. Then re-input your modified settings (there are some utilities to save the BIOS settings but often that takes more work than just recording the few that you changed and restoring them after the CMOS reset). I'll give it a try. Thanks for the explanation. -- regards, |\ /| | \/ |@rk \../ \/os |
#9
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ending up in bios
"VanguardLH" schreef in bericht ... Linea Recta wrote: I recently replaced the coin cell on my mainboard because, when booting the PC, I often ended up in the bios setup. For some time things were OK, but now and then I'm having the same symptom again. Would this coin cell (5 euro!) be exhausted again?! It's possible that you put in a weak new battery. More likely is that you did not reset the BIOS after replacing the battery, especially when you did so to replace a dead or weak battery (i.e., you waited until you had to replace the battery, not by replacing it before it was needed). Your reply might be relevant in this case. Indeed, I have not reset the bios. I remember the wrapping of the battery had a date of several years in future. However, I have to point out that the flaw is incidental... The BIOS in EEPROM gets copied into CMOS. The battery keeps alive the CMOS copy. If the battery gets too weak, it is possible the settings get corrupted in the CMOS copy. You put in a new battery but that merely provides the power to keep alive whatever settings are currently in the CMOS table. If the settings are wrong, they'll still be wrong after you put in a new battery. Record any modified settings in the BIOS. Replace the battery. Reset the BIOS (how depends on what you have which was never mentioned). This copies the hard copy of the settings from the EEPROM for the BIOS into the CMOS table. Then re-input your modified settings (there are some utilities to save the BIOS settings but often that takes more work than just recording the few that you changed and restoring them after the CMOS reset). I'll give it a try. Thanks for the explanation. -- regards, |\ /| | \/ |@rk \../ \/os |
#10
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ending up in bios
"VanguardLH" wrote in message
... Linea Recta wrote: I recently replaced the coin cell on my mainboard because, when booting the PC, I often ended up in the bios setup. For some time things were OK, but now and then I'm having the same symptom again. Would this coin cell (5 euro!) be exhausted again?! It's possible that you put in a weak new battery. This is rare but it happens . . . to me at least once, viz. a CR2032 CMOS battery failing within 3 to 6 months of replacement. They usually last 3 or 4 years. -- Don Phillipson Carlsbad Springs (Ottawa, Canada) |
#11
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ending up in bios
"VanguardLH" wrote in message
... Linea Recta wrote: I recently replaced the coin cell on my mainboard because, when booting the PC, I often ended up in the bios setup. For some time things were OK, but now and then I'm having the same symptom again. Would this coin cell (5 euro!) be exhausted again?! It's possible that you put in a weak new battery. This is rare but it happens . . . to me at least once, viz. a CR2032 CMOS battery failing within 3 to 6 months of replacement. They usually last 3 or 4 years. -- Don Phillipson Carlsbad Springs (Ottawa, Canada) |
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