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error 1802 on T41
Posted: Fri May 27, 2011 3:30 pm
by vivetck
i get an error 1802. The thing is I never installed a MINI PCI card..everything was working fine 12 hours ago and when I got back from work I got this message. So I don't know why this is happening..I disabled the wireless card so I can go to my desktop but that is about it..i have no wireless internet now
..please help
Re: error 1802 on T41
Posted: Fri May 27, 2011 7:29 pm
by vivetck
anyone ?
Re: error 1802 on T41
Posted: Fri May 27, 2011 7:51 pm
by Harryc
What mPCI WiFI card is in it? Is it a Lenovo branded FRU? Have you flashed the BIOS recently?
Re: error 1802 on T41
Posted: Sat May 28, 2011 12:07 pm
by Thinkpad Lover
Another possibility is that your CMOS battery is dying. If this was a laptop you purchased from someone else, they had probably installed a newer generation mini-PCI wifi card that is not supported on a T41, hence generating the 1802 error. To defeat the error message, they may have run the "no-1802" utility discussed here:
http://www.command-tab.com/2006/02/26/t ... error-fix/
The thing about this utility program is that it it will set a certain bit in the CMOS memory which disables the whitelist check (for "unauthorized" network cards) but the error will begin showing up again if your CMOS battery dies or, maybe (just guessing here) is in the process of dying. If you always keep your laptop plugged in, charging your main battery, and never allow your main battery to become completely depleted, I think that can mask a weak/dying CMOS battery. If this is the case then there are a couple things you will have to do:
(1) Replace the CMOS battery
(2) Remove the "unauthorized" mini-PCI wifi card
(3) Run the "no-1802" utility
(4) Reinstall the "unauthorized" mini-PCI wifi card
Daniel.