20", 23", and 30" LCD Display introduced in 2004 discontinued in 2010.

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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!

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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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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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Hi Frederic,

the female plugs are all the same. You can use the bigger power supplies for the small 20" display, but not vice versa due to the grey cable and the resistor logic behind it. Maybe your female plug is damaged in some way. However, connecting the wires directly is the safest way.

Frank

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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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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?

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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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can someone tell me if the "female plug" from power supply is the same in 65 watt , 90 watt, and 150 watt power supply units. I tried to attach the female plug with brown and red wire from lower wattage plug to my hacked power supply, it did not function. Used plug from 150 watt with black and red wire and it worked. seems these plugs may be different for the smaller watt units thank you

Fredereic

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can someone tell me if the "female plug" from Apple HD power supply is the same in 65 watt , 90 watt, and 150 watt units.

I tried to attach the female plug with brown and red wire from lower wattage plug to my hacked power supply, it did not function.

I used plug from 150 watt power supply with black and red wire and it worked. seems these plugs may be different for the smaller watt units. The plug was also marked with - and + but the lower wattage plug was not.

thank you

Fredereic

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