How to connect a cooling fan to DC outlet avc 3312 ci

the four wires will be 0V, 12V (from supply), and a sensor to sense speed (I think this is a voltage o/p proportional to the fan speed). The fourth wire with be the PWM signal to control the fan speed (input to the fan)
see Motherboard CPU 4 Pin Fan Connector Pinout AllPinouts

not sure is that a small fan?? , just hook it up to 5 volts dc quickly to test direction even a 1.5 battery may run it and tell you which is + and -

if is a brush motor dc current.
if is a stepper motor it has to be a pulsed voltage necessary.

Power/Ground/Low/High

go to www. tigerdirect.com and get it.
God bless you

I have two articles on this, neither of which correspond to what I said in another answer.
Dell use or used to use a non standard pin out (so it will depend was made by AVC especially for Dells)
In the standard pin out the black wire is 0V, the next often yellow is +V (12V for your fan) the third one is speed sense, and the final one is speed control (you search the internet under 4-pin fan pin-out to be more confident.)
Two article are
http://www.formfactors.org/developer%5Cspecs%5CREV1_2_Public.pdf (section 4.1.6)
and
http://www.setiusa.us/showthread.php?2480-PWM-Fan-Pinouts-Industry-Standard-amp-Dell-configurations the picture drom the second article I reproduce (without permission).
To be certain consult your m/b manual which should all the pin assignmens on your m/b, or you can try to measure the voltage between 0V and the second pin to verify that it is +12V in your case (it may be lower or as high as 13.2V)

I too have the same problem with the DC-DC board on the Sharp AVC. But I didn't spend the $134 for a replacement board (MCM or Newark).
Instead, I used the reflow technique by placing the circuit board in the oven for 7 minutes at 475F. You need to cover the plastic header connectors (about 7 of them) with foils to protect them from direct heat (and melt). Take the board out of the oven and give a little pressure on all the ICs while the board is hot. Let it cool down and voila! The TV is working again...

Processor (& or) motherboard is toast

Adaptec web site returns the following...

The replacement power supply must meet these specifications:
5 Volt DC Output with at least 2.5 Amperes capacity. The DC connector is configured with positive (+) on the internal or center lead and negative (-) on the external.

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That's your heatsink, and it's very dangerous for the computer to run for long without it... Laying the computer on its side does not harm it, but running it without properly installed cooling aides can be.

I suggest that you contact the manufacturer. Since your computer is less than a year old, hardware issues like this should be covered.. Just don't listen to them when they say reinstalling your OS can fix it, hah hah.