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AC Adapter Gets Very Hot
Posted: Tue Jul 31, 2007 12:44 pm
by scrawledinwax
I just received a replacement AC Adapter for the X61 (adapter pt. no 92P1155) to replace a faulty one. The old one made some very odd buzzing/screeching sounds and got quite hot.
While the new one is silent, it also gets quite hot - it's almost uncomfortable to touch. Is this normal? Or have I gotten two defective parts in a row?
Oh, thought I'd throw in - Lenovo Canada were very helpful and shipped a new adapter out in 2 days.
Posted: Tue Jul 31, 2007 1:06 pm
by tomh009
Mine is also quite hot. And screechy ...
Posted: Tue Jul 31, 2007 2:16 pm
by bowkatz
Yes mine gets hot too. But this isn't strange at all I mean... it's fanless
and small(quite small).
Posted: Tue Jul 31, 2007 2:47 pm
by Kurow
Power adapters are normally hot.
Posted: Tue Jul 31, 2007 2:59 pm
by tomh009
I'll note that my second power supply (same FRU, but rev C rather than rev E -- and with a gray Lenovo logo rather than black) also runs fairly hot, but the screeching sounds are almost inaudible.
Incidentally, the X31 power supply would only ever get warm, not hot.
Posted: Tue Jul 31, 2007 10:55 pm
by scrawledinwax
Thanks for the replies everyone. I think this one is okay... it cooled off after a bit.
Posted: Sat Aug 04, 2007 12:16 am
by Tan Mann
tomh009 wrote:I'll note that my second power supply (same FRU, but rev C rather than rev E -- and with a gray Lenovo logo rather than black) also runs fairly hot, but the screeching sounds are almost inaudible.
Incidentally, the X31 power supply would only ever get warm, not hot.
Tom,
Wanna try a 90W AC Adapter on the X61 and see how hot that gets?
Posted: Sat Aug 04, 2007 5:26 am
by tomh009
Actually the second 65W (Rev C) one is fine -- after 12 hours (in a fairly warm house), it's warm to touch, but not hot. I suspect that this is as it should be ...
Posted: Sat Aug 04, 2007 6:35 am
by phongdt
I bought an extra AC Adapter (manufactured by unknown 3rd party - China) for my X61, the information on the extra adapter read:
P/No: 92P1158
FRU P/N: 92P1157
Input: 100V-240V 1.8A 50/60Hz
Output: 20V - 3.25A
Vs the information on the original:
P/No: 92P1154
FRU P/No: 92P1153
Input: 100V-240V 1.5A 50/60Hz
Output: 20V - 3.25A
Is it OK to use the extra one? Any effect to the machine and the battery? I notice the 1.8A & 1.5A are different.
Thanks for your advise.
Posted: Sat Aug 04, 2007 6:44 am
by gdavis
phongdt,
They both put out 20v at 3.5amps. The new one either consumes some extra current in the process by using 1.8amps instead of only 1.5amps on the original one, or it has a little extra capacity when it might be helpful.
But the key is that they both provide 20volts at 3.25 amps minimum, so you're in great shape.
Posted: Sat Aug 04, 2007 8:21 am
by phongdt
gdavis,
Thanks a lot for your prompt reply. I have just 2 small questions:
- When I plug in the extra adapter, the machine show it's 90W adapter plugged. Is it OK since the original one showed only 65W.
- Is there any chances the new adapter may generate unstable current? (since the look and feel of the new one not so good compare to the original one)? If it is, which will be effect? Battery or the the machine itself?
Posted: Sat Aug 04, 2007 9:42 am
by gdavis
The extra wattage is not needed if the laptop doesn't require that extra. What it important is that it has 20v, which both do, and at least the 65w which came with the original transformer. The extra 25watts is usable for things like if you had the ultrabase with the dvd drive running too.
What is a little odd, is that the new one should show 4.5A output instead of the 3.25A if it indicates 90w on the computer being plugged in, unless I did the math wrong. But it won't be unstable for anything, just extra if it's needed.