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TUSL2 CMOS reset?
In article , "RHD" wrote:
Hi, I have a TUSL2 motherboard, is there a way I can reset the CMOS? I have read through the manual and I can't find any info on it. I have tried to install windows 2000 twice and flashed the BIOS also and I still get corruption error messages when installing windows. Any help appriciated. Would removing the battery do it? Thanks -RHD A PDF version of the manual is he ftp://ftp.asus.com.tw/pub/ASUS/mb/so...e811_tusl2.pdf (pg.59) It is the section "Forgot the password?" that contains the clear CMOS procedure in the older manuals. If searching the PDF manual, I look for CLRTC or RTC (real time clock) to try to find where the procedure is hidden. In this case, there is no mention of the battery, so I guess shorting the solder points is enough. Note the "unplug your computer" step is very important, as sometimes the power for the RTC circuit is connected to +5VSB (the standby supply), and if you short the solder points while +5VSB is still powered, parts of the circuit can be damaged (people have reported burning up a diode by doing that). From the manual - "To erase the RTC RAM: (1) Unplug your computer, (2) Short the solder points, (3) Turn ON your computer, (4) Hold down Delete during bootup and enter BIOS setup to re-enter user preferences." In terms of the circuit, in some CMOS battery circuits, there is a current limiting resistor coming from the battery. If you short the solder points, this resistor prevents the battery current from becoming too high. Power also comes from +5VSB, but a current limiting resistor cannot be placed on that side of the circuit, because when the computer is running, much more current is drawn from +5VSB. Without a current limiting resistor, there is much more potential for damage when shorting the solder points. That is the reason for unplugging the computer. Note that some Asus manuals have incorrect procedures listed for clearing the CMOS. That is why it is important when going to the download site, to click the "Manual" button, and see if there are any documents that contain corrections to the manual (usually called an "insert"). http://www.asus.com.tw/support/download/download.aspx (download page) HTH, Paul |
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Thanks Paul
"Paul" wrote in message ... In article , "RHD" wrote: Hi, I have a TUSL2 motherboard, is there a way I can reset the CMOS? I have read through the manual and I can't find any info on it. I have tried to install windows 2000 twice and flashed the BIOS also and I still get corruption error messages when installing windows. Any help appriciated. Would removing the battery do it? Thanks -RHD A PDF version of the manual is he ftp://ftp.asus.com.tw/pub/ASUS/mb/so...e811_tusl2.pdf (pg.59) It is the section "Forgot the password?" that contains the clear CMOS procedure in the older manuals. If searching the PDF manual, I look for CLRTC or RTC (real time clock) to try to find where the procedure is hidden. In this case, there is no mention of the battery, so I guess shorting the solder points is enough. Note the "unplug your computer" step is very important, as sometimes the power for the RTC circuit is connected to +5VSB (the standby supply), and if you short the solder points while +5VSB is still powered, parts of the circuit can be damaged (people have reported burning up a diode by doing that). From the manual - "To erase the RTC RAM: (1) Unplug your computer, (2) Short the solder points, (3) Turn ON your computer, (4) Hold down Delete during bootup and enter BIOS setup to re-enter user preferences." In terms of the circuit, in some CMOS battery circuits, there is a current limiting resistor coming from the battery. If you short the solder points, this resistor prevents the battery current from becoming too high. Power also comes from +5VSB, but a current limiting resistor cannot be placed on that side of the circuit, because when the computer is running, much more current is drawn from +5VSB. Without a current limiting resistor, there is much more potential for damage when shorting the solder points. That is the reason for unplugging the computer. Note that some Asus manuals have incorrect procedures listed for clearing the CMOS. That is why it is important when going to the download site, to click the "Manual" button, and see if there are any documents that contain corrections to the manual (usually called an "insert"). http://www.asus.com.tw/support/download/download.aspx (download page) HTH, Paul |
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