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20-inch, 23-inch, and 30-inch aluminum LCD displays introduced by Apple in June 2004. Models A1081, A1082, and A1083 respectively.

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5-Pin Power Adaptor pin assignments

Hello.

I would like to know the pin assignments for the power adaptor of an Apple Cinema HD Display.

I need to know the Voltage Supply for each Pin of the 5-Pin connection-cable for the original Cinema HD Power Adaptor.

I need to test this display as the original adaptor is broken. I would like to supply power with another adaptor accordingly.

I guess the pin assignment is the same for the 20", 24" and 30" models.

Any help is much appreciated.

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Thanks Chris.

I would like to know what pin 3 (the middle pin) is doing!

If I supply the voltage on pin 1,2 and 4,5 the display won't switch on.

Do I need to supply any voltage on pin 3?

Any advice is much apreciated!

von

From what I've read, you don't need to connect pins 3 and 8. The default apple adaptors use some form of resistor between them to identify the adaptor, if you want to give that a shot. Also, make sure that you are using a -24.5V supply, not ground on 2, 4, 7, and 9. Depending on the size of your display, you need 65-150 watts.

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I found a forum post that explains the connection in detail. The connector is the same for all displays, but a higher wattage adapter is required for the 30" model. To sum up the forum post, the connector has a symmetrical pinout like this:

Pins 1,2,3,4,5

|+24.5VDC|-24.5VDC|SENSE|-24.5VDC|+24.5VDC|

|+24.5VDC|-24.5VDC|SENSE|-24.5VDC|+24.5VDC|

Pins 6,7,8,9,10

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Chris, you mention that the pins 2,7,4,9 need a MINUS 24V supply but in that thread, the second poster mentioned using a POWERBOOK PSU, which only has Vcc and ground. Basically only positive voltage and ground. If the ACD used a 48V difference, then it would mean that brick is a sub 2 amp brick and for that size, I suspect it's not.

von

The red wire supplies 24.5v and the black wire is ground. Please do not connect black to a -24.5v power source. You will destroy the monitor for sure. DunCanP's comment is correct!

von

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Hi,

just did a repair of a 30" myself. The correct layout is

Pins 1,2,3,4,5

|+24.5VDC|GND|SENSE|GNDC|+24.5VDC|

|+24.5VDC|GND|SENSE|GND|+24.5VDC|

Pins 6,7,8,9,10

The wires are red für +24.5V, black for GND and grey for sensing.

It also works with 24V. If you try another power supply and cut off the plug, I would not recommend to connect the shield with the black GND cable. The grey wire is completely useless, it only helps to prevent the bigger ACDs from being switched on with a power supply for the smaller ACDs. So do not connect it to +5V or anything else - just leave it unconnected.

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What is the sense wire for. I was wondering if you could hook up a different source of power but the correct voltage and Watts. Would it power on then and work for you?

von

As I said, the ACDs use the grey sense wire for checking if the appropriate power supply is connected. if you leave the grey wire from the ACD unconnected, you can choose any power supply with 24V and the correct Watt Power - they all work

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lmgtfy - The pin out is in the column on the right on this page: http://en.wikipedia.org/wiki/Apple_Displ...

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He has a Apple Cinema display, not a Studio display. Cinema displays have an independent power connector, and a DVI connector.

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The lay out above is wrong, I read related post and cut the power cable, it got three wires and shield:

red 24.5v

black ground for DC

grey 5v for USB

SHIELD GROUND

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Please note that the consensus is that the grey wire is NOT a 5v for USB. It is a sense cable, by which the monitor knows if you have plugged in an underrated power supply which will blow up of the display tries to draw power.

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How do you measure the connector with a multimeter? I am not getting a reading but also should I be when the monitor is not plugged? I don't have much experience with a multimeter so any help would be appreciated.

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@efernandezabril that is correct. You would NOT get anything with the monitor disconnected. Those voltages are what the monitor needs to be connected to, in order for it to work.

von

Thanks! So, what would be the correct way to measure if the pins are giving the right voltage? The PSU is connected to the power but in order to measure its output I would need to have the monitor NOT plugged to the PSU, otherwise I can’t reach the pins. Does that make sense? Sorry, still learning.

von

@efernandezabril you would measure at the points where you plug the monitor in. So, if you plug it into an adapter, you measure the contacts on the adapter to see if it supplies the voltage needed by the monitor.

von

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Anant Kishor wird auf ewig dankbar sein.
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