Need help with identifying an electronic component - A79T

zYx · 17 Mar 2012 at 18:03

From this picture:

It's a PCB taken out from the new Cosmos II case. It is responsible for powering (I think) 10 LEDs. On the front panel, there is a button when pressed enables or disables all LEDs. The button itself works fine as it has it's own LED, but all the actual LEDs remain constantly ON.

I need to identify and possibly buy an alternative component and get this thing fixed.

Obviously I will try cooler master to send me the front panel only instead of sending the entire case back to them as I already have my hardware in it...

anyways, if you know what this component is, please let me know. I might just replace it.

Thanks.

RomanNose · 17 Mar 2012 at 18:14

I think it's just a diode.

zYx · 17 Mar 2012 at 18:18

original size picture:

Jokester · 17 Mar 2012 at 18:21

It looks like a transistor of some sort.

lee32uk · 17 Mar 2012 at 18:26

I would have said a Transistor as it looks like it has 3 legs ? but im probably wrong

Turambar · 17 Mar 2012 at 18:40

http://www.marsport.org.uk/smd/mainframe.htm

Looking up "A7" will get you a number of possibilities, all Schottky Diodes.

23JMZ07 · 17 Mar 2012 at 18:56

Its a transistor as confirmed by the "Q" marking on the PCB.

zYx · 17 Mar 2012 at 18:58

Ok, and the circuit

I found this in china:
http://translate.google.com/transla....alibaba.com/buyer/offerdetail/542756977.html

I need AO3407, apparently AO3407A or equivalent..

bitslice · 18 Mar 2012 at 13:48

It's a fan controller, it's highly likely to require some form of transistor or in this case MOSFET.
D would signify a diode.

Why do people post if they don't know something as basic as that?

23JMZ07 said:
Its a transistor as confirmed by the "Q" marking on the PCB.

Yes

http://www.aosmd.com/pdfs/datasheet/AO3407.pdf

Might get some here?
http://www.ebayic.com/tben/stocklist.asp?id=19727

It's not likely to be that critical, it's only controlling speed. Look at specs and compare it to similar 30v p-channel mosfets from eBay and find something compatible. The type and pinout are the only fixed things here.