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4 pin HP video power connector layout
4 pin HP video power connector
this connector is not used often
Power Supply
Pin 		Name Direction Description
1-12 Volts-12 Volts
2Ground-12 Volts Ground
3Ground+12 Volts Ground
4+12 Volts+12 Volts
This connector was actually used in some Pavilion models, in particular, ones that featured the EnSoniq soundcard. It is used to power the onboard power amplifier on these cards.
Pinout status: +1 -0
According to 1 reports in our database (1 positive and 0 negative) the HP Power pinout should be correct.

Is this pinout
NO DIY devices
HP Power visual pinout:click to enlarge
Source(s) of this and additional information: http://www.power-on.com/miathppa1.html Wilfred Dumont
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