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Latitude C840 AC Adapter issue, CPU issue

post #1 of 8
11/20/09 at 5:55pm
Thread Starter 
Working on a Dell Latitude C840, 1.8ghz Pentium M, 256mb PC2700 (upgrading to 512mb), 40gb hard drive, purchased at some kind of "emporium" or some such. The AC Adapter is model ADP-90FB, 90W, bios reads it as a 70W adapter, reports that the laptop should be using a 90W adapter (which it is) and that the computer won't run as it should, as such, and to press F1 to continue booting into battery saving mode (whatever). I've updated the bios which didn't change a thing.

Also, once up in Windows (XP Professional), System Properties reports the CPU correctly but claims it's running at 789mhz on AC. Adjusting the power options (Always On) makes no difference, disabling 'Smart CPU Mode' on AC, and setting 'CPU On AC' to Maximum Performance, in the bios, made no difference either.

Can these 2 issues be related? Other than this, the laptop runs just fine...


Thanks, -kd5-
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post #2 of 8
11/20/09 at 11:30pm
you most likely require a new adaptor
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post #3 of 8
11/20/09 at 11:50pm
As a desperate guess try without battery in? But yes if the adapter is 70w sure could be the issue.
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post #4 of 8
11/21/09 at 9:49am
Thread Starter 
Even if the current adapter is actually (supposed to be) 90W, you think replacing it will cure the problem? -kd5-
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post #5 of 8
11/21/09 at 9:51pm
it should yes
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post #6 of 8
11/22/09 at 6:08am
Replacing the AC Adapter would be the first thing I'd try. Yes, we know what the adapter is SUPPOSED to be. So the next logical step in troubleshooting would be to determine if it's the computer's problem or the Adapter's.
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post #7 of 8
11/22/09 at 10:04am
Thread Starter 
For everything there is a first time and this is a first for me. I always assumed when an AC Adapter went bad it was toast. Until now I didn't know there were shades of gray to consider. I am always proud to learn new things, the day I stop learning is the day I die.

Thanks guys, -kd5-
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post #8 of 8
11/22/09 at 2:23pm
Ouch, you would not want to have a toasted AC Adapter ... when that happens, it might also toast some other stuffs in the notebook

cheers ...
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