Re: how annoying.. [IBM thinkpad]


"carl0s" <carl@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:dtirh7$6f0$1$8302bc10@xxxxxxxxxxxxxxxxxxx


I have since noticed that the PSU is over-rated, at 4.5amps instead of the
machines stated 3.5A, but I thought that the additional current was simply
not used. Could this have been the cause of the problem?


No. As long as the voltage is identical and the current capacity is equal or
greater, it will be fine. The laptop will draw whatever current it needs,
and a larger capacity power supply is in fact a bonus- it *should* run
cooler and last longer.

I have now tried a more closely matched thinkpad PSU (3.36A), and it does
the same.

thanks for any help.


Laptops generally slow-charge the battery when powered up, and fast charge
the battery when powered off. This is because of the limitations of the
small power supplies. It sounds like something on the motherboard was
damaged while charging the battery, possibly the battery itself has an
issue- maybe that damaged your old motherboard? It's impossible to say
without proper diagnostic procedures.

You'll need some considerable experience with SMT rework, the necessary
tools and access to what are often specialist components if you are to be
able to sort this out yourself, a multimeter and a soldering iron aren't
enough.

Is there a light on the power supply? Does it dim when the laptop is
misbehaving? It sounds like the laptop is drawing too much current, or the
power supply voltage is too low.

Dave


.

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