Inspiron One 19 (Model W01B) Motherboard 0J190T Power Connector Pinout

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Inspiron One 19 (Model W01B) Motherboard 0J190T Power Connector Pinout

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I have attempted to find a pinout diagram for the power connector on the 0J190T motherboard for a Insiron One 19 - Model W01B and cannot find one within Dells supprt pages for this unit.  Does anyone here know what the pinout is?  I have a system that came to  me without the power supply and have determined that the supply is needed is 19VDC at 6.9A.  I know that 2 pins are for + and 2 pins are for - but cannot find any information on polarity for the pins on the connector.  I do not know if this motherboard is bad or not and do not want to waste $80 on a supply if the MB is bad.  I have a switching supply rated for 19VDC at 7A and a 4 pin power connector for testing.  I do not want to risk reversing the polarity (in the event therfe is not diode portection on this MB).  does someone either have a pinout document or have a power supply from one of these units that they can measure the voltage out and let em know what color (yellow or black) is the positive?  any assistance would be a great help.

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