Clevo M720T bios proble

Hi

i've a problem with my clevo m720t.The cmos give me this error : 0271 check date time and settings, 0251 system cmos checksum bad- default configuration used.I've changed the cmos battery with newone but when i fix the configuration and switch off the pc everytime losts the configuration.Bios version 1.02.22 kbc/ec firmware revision 1.00.09.The battery is ok and the pc battery works well.I have xp professional and if i try to change date or hours in xp i can't.Only change in bios screen.I've tryed to change gpedit.msc and remove administrators anda powerusers but i haven't no effect.

 

Try to flash latest ec and bios (in that order):
EC firmware 1.00.11
System BIOS 1.02.28

Replacing cmos battery on ' check date and time' message ought to have done the trick though, so ... maybe it's merely a bad contact? Could try sanding (or contact spray) and may bend the retainer clips back a bit so they'll have a stronger grip on the battery.

 

Thanks for your reply. I've mounted a new cmos battery with 2 pin cable but the configuration lost ever. Probably a mb defect? Why in Windows xp with admin access i can't change the dateor the hours?

 

Yes, could be; the bios EEPROM has a limited lifespan as well, would need to solder in a new bios chip then. To be clear: it doesn't keep any settings, right? No boot order change and such?

When trying to change Windows time; you don't get a ' Need administrator permission' sort of message, do you? That would indicate a specific service isn't running (forgot which one ...).

Anyway, Windows' time works with an offset of +/- X seconds compared to time reported by cmos. After synchronising it updates the X value. If cmos time remains at, say, 1-1-1980 then so should Windows time remain static at 1-1-1980+54,000 seconds ( policy setting; MaxPosPhaseCorrection). Perhaps it concludes that even the maximum permitted offset isn't enough and decides to fail? Could change the registry setting to "0xFFFFFFFF":

Or save this as .reg and run:

Code:

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\W32Time\Config]
"MaxPosPhaseCorrection"=dword:ffffffff

If registry didn't help, try this in a command window (service ' Windows Time' needs to be running):

Code:

w32tm /resync

If that works and time still remains static (since cmos is static), then you could schedule a batch script to run at startup (or via Task Scheduler):

Code:

:resync
w32tm /resync
timeout /t 1
goto resync

Could hide the CMD window with this .vbs:

Code:

Set WshShell = CreateObject("WScript.Shell")
WshShell.Run chr(34) & "C:\PATH\resync.cmd" & Chr(34), 0
Set WshShell = Nothing

Create shortcut to the resync.vbs and drop in the Startup folder, will keep running silently then. Can check it's working by looking for w32tm.exe and timeout.exe in Task Manager; they'll keep starting/stopping every second.