hard wire power plug

zirath

We recently got an IBM 9511-AG4 lcd monitor. The power jack on the monitor
wasn't making good contact and finally stopped functioning. After looking at
the board that the jack is install on, I found 4 pins that seemed to be for
the jack. 3 of the pins were grounding and the 4th wasn't. I was thinking of
connecting the + wire from the ac adapter to the 4th pin and the - wire to a
ground.

Would this be safe?

Thanks.

Paul

zirath wrote:
> We recently got an IBM 9511-AG4 lcd monitor. The power jack on the monitor
> wasn't making good contact and finally stopped functioning. After looking at
> the board that the jack is install on, I found 4 pins that seemed to be for
> the jack. 3 of the pins were grounding and the 4th wasn't. I was thinking of
> connecting the + wire from the ac adapter to the 4th pin and the - wire to a
> ground.
>
> Would this be safe?
>
> Thanks.
>

On a laptop, the jack might look like this. They actually have a switch
inside the jack, that is sensitive to the presence of the barrel of the
power supply. On an LCD monitor, they wouldn't need that, so the jack style
could be different. Or, they could use one with the switch, and simply not
connect electrically to the extra terminal.

http://www.cui.com/pdffiles/PJ1-021.pdf

The first thing you'd check, is whether the plug is "center positive"
or "center negative". For barrel connectors, this is supposed to be
marked in the plastic, near the jack. That will help ensure that you do
the right thing with respect to the center pin.

You'll notice in that PDF, that terminal 1 is the center pin terminal.
So whatever polarity is marked in the plastic, is the wire you'd
connect to "1".

For the other connection, you need to figure out how the jack works,
whether it is a simple power connection (it should be, on a monitor).
Some of the pieces of metal on a connector, can be there for
mechanical rigidity, rather than an electrical connection. Maybe the
copper patterns on the PCB, will give some hint as to where the
power flows. Getting the center pin polarity right, will reduce
(but not eliminate) the risk of blowing the thing up.

There are all sorts of minor variations on these things, as can be
seen in some of the pictures here.

http://dkc3.digikey.com/PDF/T081/P0438.pdf

Paul

zirath

"Paul" <nospam@needed.com> wrote in message
news:g2ia0b$nhi$1@registered.motzarella.org...
> zirath wrote:
>> We recently got an IBM 9511-AG4 lcd monitor. The power jack on the
>> monitor wasn't making good contact and finally stopped functioning. After
>> looking at the board that the jack is install on, I found 4 pins that
>> seemed to be for the jack. 3 of the pins were grounding and the 4th
>> wasn't. I was thinking of connecting the + wire from the ac adapter to
>> the 4th pin and the - wire to a ground.
>>
>> Would this be safe?
>>
>> Thanks.
>
> On a laptop, the jack might look like this. They actually have a switch
> inside the jack, that is sensitive to the presence of the barrel of the
> power supply. On an LCD monitor, they wouldn't need that, so the jack
> style
> could be different. Or, they could use one with the switch, and simply not
> connect electrically to the extra terminal.
>
> http://www.cui.com/pdffiles/PJ1-021.pdf
>
> The first thing you'd check, is whether the plug is "center positive"
> or "center negative". For barrel connectors, this is supposed to be
> marked in the plastic, near the jack. That will help ensure that you do
> the right thing with respect to the center pin.
>
> You'll notice in that PDF, that terminal 1 is the center pin terminal.
> So whatever polarity is marked in the plastic, is the wire you'd
> connect to "1".
>
> For the other connection, you need to figure out how the jack works,
> whether it is a simple power connection (it should be, on a monitor).
> Some of the pieces of metal on a connector, can be there for
> mechanical rigidity, rather than an electrical connection. Maybe the
> copper patterns on the PCB, will give some hint as to where the
> power flows. Getting the center pin polarity right, will reduce
> (but not eliminate) the risk of blowing the thing up.
>
> There are all sorts of minor variations on these things, as can be
> seen in some of the pictures here.
>
> http://dkc3.digikey.com/PDF/T081/P0438.pdf
>
> Paul

I found a 2 pin plug socket (don't know if it's called a "sata" plug), on
the side
of the power plug board that gives the same readings on the ohm meter as the
power plug (when the pluig is in - turning on the switch). It gives a ground
reading on one pin and shows a capacitor on the other that charges to the
same amount of resistance.

I was wondering if this might be a back-up plug for the power

Paul

zirath wrote:
> "Paul" <nospam@needed.com> wrote in message
> news:g2ia0b$nhi$1@registered.motzarella.org...
>> zirath wrote:
>>> We recently got an IBM 9511-AG4 lcd monitor. The power jack on the
>>> monitor wasn't making good contact and finally stopped functioning. After
>>> looking at the board that the jack is install on, I found 4 pins that
>>> seemed to be for the jack. 3 of the pins were grounding and the 4th
>>> wasn't. I was thinking of connecting the + wire from the ac adapter to
>>> the 4th pin and the - wire to a ground.
>>>
>>> Would this be safe?
>>>
>>> Thanks.
>> On a laptop, the jack might look like this. They actually have a switch
>> inside the jack, that is sensitive to the presence of the barrel of the
>> power supply. On an LCD monitor, they wouldn't need that, so the jack
>> style
>> could be different. Or, they could use one with the switch, and simply not
>> connect electrically to the extra terminal.
>>
>> http://www.cui.com/pdffiles/PJ1-021.pdf
>>
>> The first thing you'd check, is whether the plug is "center positive"
>> or "center negative". For barrel connectors, this is supposed to be
>> marked in the plastic, near the jack. That will help ensure that you do
>> the right thing with respect to the center pin.
>>
>> You'll notice in that PDF, that terminal 1 is the center pin terminal.
>> So whatever polarity is marked in the plastic, is the wire you'd
>> connect to "1".
>>
>> For the other connection, you need to figure out how the jack works,
>> whether it is a simple power connection (it should be, on a monitor).
>> Some of the pieces of metal on a connector, can be there for
>> mechanical rigidity, rather than an electrical connection. Maybe the
>> copper patterns on the PCB, will give some hint as to where the
>> power flows. Getting the center pin polarity right, will reduce
>> (but not eliminate) the risk of blowing the thing up.
>>
>> There are all sorts of minor variations on these things, as can be
>> seen in some of the pictures here.
>>
>> http://dkc3.digikey.com/PDF/T081/P0438.pdf
>>
>> Paul
>
> I found a 2 pin plug socket (don't know if it's called a "sata" plug), on
> the side
> of the power plug board that gives the same readings on the ohm meter as the
> power plug (when the pluig is in - turning on the switch). It gives a ground
> reading on one pin and shows a capacitor on the other that charges to the
> same amount of resistance.
>
> I was wondering if this might be a back-up plug for the power
>

You mean like a factory test point of some sort ? Is it
accessible externally ? Normally, the only externally
accessible power connection, would be the barrel connector.

Paul

zirath

"Paul" <nospam@needed.com> wrote in message news:g2n2d8$4go$1@aioe.org...
> zirath wrote:
>> "Paul" <nospam@needed.com> wrote in message
>> news:g2ia0b$nhi$1@registered.motzarella.org...
>>> zirath wrote:
>>>> We recently got an IBM 9511-AG4 lcd monitor. The power jack on the
>>>> monitor wasn't making good contact and finally stopped functioning.
>>>> After looking at the board that the jack is install on, I found 4 pins
>>>> that seemed to be for the jack. 3 of the pins were grounding and the
>>>> 4th wasn't. I was thinking of connecting the + wire from the ac adapter
>>>> to the 4th pin and the - wire to a ground.
>>>>
>>>> Would this be safe?
>>>>
>>>> Thanks.
>>> On a laptop, the jack might look like this. They actually have a switch
>>> inside the jack, that is sensitive to the presence of the barrel of the
>>> power supply. On an LCD monitor, they wouldn't need that, so the jack
>>> style
>>> could be different. Or, they could use one with the switch, and simply
>>> not
>>> connect electrically to the extra terminal.
>>>
>>> http://www.cui.com/pdffiles/PJ1-021.pdf
>>>
>>> The first thing you'd check, is whether the plug is "center positive"
>>> or "center negative". For barrel connectors, this is supposed to be
>>> marked in the plastic, near the jack. That will help ensure that you do
>>> the right thing with respect to the center pin.
>>>
>>> You'll notice in that PDF, that terminal 1 is the center pin terminal.
>>> So whatever polarity is marked in the plastic, is the wire you'd
>>> connect to "1".
>>>
>>> For the other connection, you need to figure out how the jack works,
>>> whether it is a simple power connection (it should be, on a monitor).
>>> Some of the pieces of metal on a connector, can be there for
>>> mechanical rigidity, rather than an electrical connection. Maybe the
>>> copper patterns on the PCB, will give some hint as to where the
>>> power flows. Getting the center pin polarity right, will reduce
>>> (but not eliminate) the risk of blowing the thing up.
>>>
>>> There are all sorts of minor variations on these things, as can be
>>> seen in some of the pictures here.
>>>
>>> http://dkc3.digikey.com/PDF/T081/P0438.pdf
>>>
>>> Paul
>>
>> I found a 2 pin plug socket (don't know if it's called a "sata" plug), on
>> the side
>> of the power plug board that gives the same readings on the ohm meter as
>> the
>> power plug (when the pluig is in - turning on the switch). It gives a
>> ground
>> reading on one pin and shows a capacitor on the other that charges to the
>> same amount of resistance.
>>
>> I was wondering if this might be a back-up plug for the power
>
> You mean like a factory test point of some sort ? Is it
> accessible externally ? Normally, the only externally
> accessible power connection, would be the barrel connector.
>
> Paul
>

It's not accessible externally.