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Is it possible to test a PC PSU while it is outside the PC? ie,not connected
to any of the equipment inside,but just plugged into the power outlet?
Or does it have to be actually plugged in to all the bits inside the
computer.? I just want to know before i install a different PSU which i am
not sure if it works

thanks
me

"me" <> wrote:

|>Is it possible to test a PC PSU while it is outside the PC? ie,not connected
|>to any of the equipment inside,but just plugged into the power outlet?
|>Or does it have to be actually plugged in to all the bits inside the
|>computer.? I just want to know before i install a different PSU which i am
|>not sure if it works

Yes, but you should have a load on it, just hook a spare HD or two to
it. helpful PS link http://www.fonerbooks.com/power.htm

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me wrote:
> Is it possible to test a PC PSU while it is outside the PC? ie,not connected
> to any of the equipment inside,but just plugged into the power outlet?
> Or does it have to be actually plugged in to all the bits inside the
> computer.? I just want to know before i install a different PSU which i am
> not sure if it works
>
> thanks
> me
>
>
>
Any PSU can be powered thru the input pair (make sure that all output
pairs are isolated). The voltages can be read at the output pairs.
Some may read somewhat higher than the operational voltage due to there
being no loads applied.

me wrote:

> Is it possible to test a PC PSU while it is outside the PC? ie,not connected
> to any of the equipment inside,but just plugged into the power outlet?
> Or does it have to be actually plugged in to all the bits inside the
> computer.? I just want to know before i install a different PSU which i am
> not sure if it works

http://www.geeks.com/details.asp?inv...&cpc=SCH&srm=0


--
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"Trax" <> wrote in message
news:...
> "me" <> wrote:
>
> |>Is it possible to test a PC PSU while it is outside the PC? ie,not
> connected
> |>to any of the equipment inside,but just plugged into the power outlet?
> |>Or does it have to be actually plugged in to all the bits inside the
> |>computer.? I just want to know before i install a different PSU which i
> am
> |>not sure if it works
>
> Yes, but you should have a load on it, just hook a spare HD or two to
> it. helpful PS link http://www.fonerbooks.com/power.htm
>
> --

Thanks Trax.I'll try that. If i get no joy from that i guess it could be
dead.

me wrote:
>
> Is it possible to test a PC PSU while it is outside the PC? ie,not connected
> to any of the equipment inside,but just plugged into the power outlet?
> Or does it have to be actually plugged in to all the bits inside the
> computer.? I just want to know before i install a different PSU which i am
> not sure if it works

These days you really have to at least connect it to a system first,
even if you dont screw it it [mount it yet], it still needs a load. Yes
it sucks when you only got one pc and no test pc. Things got more
complicated when we went from AT to ATX ps's.




--
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"Plato" <|@|.|> wrote in message
news:43b8c2ac$2$11788$...
> me wrote:
>>
>> Is it possible to test a PC PSU while it is outside the PC? ie,not
>> connected
>> to any of the equipment inside,but just plugged into the power outlet?
>> Or does it have to be actually plugged in to all the bits inside the
>> computer.? I just want to know before i install a different PSU which i
>> am
>> not sure if it works
>
> These days you really have to at least connect it to a system first,
> even if you dont screw it it [mount it yet], it still needs a load. Yes
> it sucks when you only got one pc and no test pc. Things got more
> complicated when we went from AT to ATX ps's.
>
>

If there is no load and i just plug it in and switch it on,should it still
come on,ie fans spin up,etc ?
Or will it pretend to be dead unless there is an actual load on it?

On Sun, 1 Jan 2006 23:00:43 -0800, me wrote:

>
>"Plato" <|@|.|> wrote in message
>news:43b8c2ac$2$11788$...
>> me wrote:
>>>
>>> Is it possible to test a PC PSU while it is outside the PC? ie,not
>>> connected
>>> to any of the equipment inside,but just plugged into the power outlet?
>>> Or does it have to be actually plugged in to all the bits inside the
>>> computer.? I just want to know before i install a different PSU which i
>>> am
>>> not sure if it works
>>
>> These days you really have to at least connect it to a system first,
>> even if you dont screw it it [mount it yet], it still needs a load. Yes
>> it sucks when you only got one pc and no test pc. Things got more
>> complicated when we went from AT to ATX ps's.
>>
>>
>
>If there is no load and i just plug it in and switch it on,should it still
>come on,ie fans spin up,etc ?
>Or will it pretend to be dead unless there is an actual load on it?

It will pretend to be dead.

If you mean the PSU fan, so what, it's only 1 fan. It's the current the
different voltage rails can supply i.e. the load that needed tested.

http://www.fonerbooks.com/power.htm
The presence of the power_ok signal tells the motherboard that the
power supply is stable, while its absence tells the motherboard to stay
off to protect itself.


http://wiki.ehow.com/Convert-a-Compu...b-Power-Supply
How to Convert a Computer ATX Power Supply to a Lab Power Supply
In the older ATX power supplies, the brown sense wire needs to be
attached to the 5v wire for the PSU to work.

Does the PSU fan come on? You can place your voltmeter leads into an
extra plug (for disk drives). It should read close to 5V (between red
and black wires). A supply that you have pulled may look dead because it
does not have a load on it's outputs and the enable output may not be
grounded (green wire).

and so on.... , see www.google.com for more - atx psu power_ok

Me

"me" <> wrote:

|>
|>"Plato" <|@|.|> wrote in message
|>news:43b8c2ac$2$11788$...
|>> me wrote:
|>>>
|>>> Is it possible to test a PC PSU while it is outside the PC? ie,not
|>>> connected
|>>> to any of the equipment inside,but just plugged into the power outlet?
|>>> Or does it have to be actually plugged in to all the bits inside the
|>>> computer.? I just want to know before i install a different PSU which i
|>>> am
|>>> not sure if it works
|>>
|>> These days you really have to at least connect it to a system first,
|>> even if you dont screw it it [mount it yet], it still needs a load. Yes
|>> it sucks when you only got one pc and no test pc. Things got more
|>> complicated when we went from AT to ATX ps's.
|>>
|>>

|>If there is no load and i just plug it in and switch it on,should it still
|>come on,ie fans spin up,etc ?
|>Or will it pretend to be dead unless there is an actual load on it?

From the link I supplied earlier, guess I should of mention'd it.

"As you know, the ATX power supply will not turn on normally without a
motherboard connected to it. There are times when you may want to
test an ATX power supply or use the voltage from one but don't really
want to hook up a motherboard. There's only one green wire and there
are plenty of ground wires so it's easy to do. To use a bent paper
clip and insert one end in the green wire connector and bend it around
and put it into a black wire connector."

I know this conflicts with Why?'s brown wire, but it works.


--
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Whether a power supply needs a load is unique to every
switcher design - today as it was 30 years ago. Some
switchers require minimal loading to operate. Others do not.
If a supply works without a load, then you know only that it
might be functional. If it does not start without a load,
then you know only that it might not be functional.

Only sufficient testing of a supply is to measure voltages
when supply is fully loaded - ie connected to a computer.
Furthermore, no minimally sufficient power supply can damage a
computer. The expression 'minimally sufficient' because so
many power supplies are dumped into a market where many
computer assemblers don't have electrical knowledge. A
minimally sufficient power supply cannot be damaged by the
load (ie computer) and cannot damage the load. Best way to
test a power supply is connected to a known good load and then
confirm numbers with a 3.5 digit multimeter.

Yes, even defective (marginal) power supplies will spin fans
and power a computer; and still be defective. Meter (not
motherboard monitor) is necessary to test a power supply.

me wrote:
> If there is no load and i just plug it in and switch it on,should
> it still come on,ie fans spin up,etc ?
> Or will it pretend to be dead unless there is an actual load on it?