Can i fix my HiFonics?

[Ctminime 10+ year member]

ok today my Hifonics died..... to see what happend to burn up i took the plate off and and i see this little black dealer off the side of the board and if i can find out what it is and get another one im sure (that with my previous skills soldering) that i can fix it.... i just need to know what part im looking for.... and it this thot of me fixing it just false hope.... heres a pic to maybe help figure it out....

http://i39.photobucket.com/albums/e156/ctminime/101_0926.jpg

Click to read more...

 

[netherland24 5,000+ posts]

KB audio can fix it... that just a mosfet i beleive that messed up... there might be some forum members that can fix that.

 

[Ctminime 10+ year member]

i woundnt mind that..... any takers on fixing it.... if not where can i get this part?

 

[jrz126 10+ year member]

yeah its just a simple mosfet.

can you get a part number off of the one next to it?

then maybe you can order from digikey.com or mouser.

 

[djman37 5,000+ posts]

I've heard when mosfets go, something either 'took' them or 'goes with' them G/L.

 

[regal8r 5,000+ posts]

mosfet??? isnt that a transistor?? it has 3 leads, base emitter and collector? idk much about what makes up an amp tho.

 

[SubbinNCali 10+ year member]

http://www.audioclinik.com/audio.htm

 

[helotaxi 5,000+ posts]

Yeah, its a high speed switch related to a transistor, the difference is that while a transistor is an anlog device (varying degrees of "on") a MOSFET (Metal Mxide Field Effect Transistor) is a digital device that is either on or off.

 

[matt_martin87 10+ year member]

ok there is no part number on any of the ones next to it..... so what do i do with that to determine the voltage and impedance of the mosfet that i need to get....

 

[helotaxi 5,000+ posts]

There's a lot more to it than that. There should be a spec printed on the FET in either white or grey. The things that matter, among others, are on resistance, threshold voltage and current capacity. You need to replace with the same spec.

I would suggest taking the whole shebang into an electronic supply store and see if they can help you out.

 

[jrz126 10+ year member]

gate capacitance is also a pretty big player.

Its possible that they removed the part number from the fets.

The part number would be located same place as the IR is in that picture.

I just took another look at your pic. it looks like a resistor burned up as well.

 

[helotaxi 5,000+ posts]

I just took another look at your pic. it looks like a resistor burned up as well.

It looks like a diode to me and judging by the char marks it looks like only the FET went, at least in what you can see in the picture. Of course all kinds of things could be shot but not be burned up...

 

[jrz126 10+ year member]

you cant really tell what it is since it is all burned up. But the marking on the PCB almost definitly looks like an R to me (R25P).

I think I remeber reading somewhere that all of the mosfets should be replaced because they might be slightly damaged as well.

 

[helotaxi 5,000+ posts]

Looks like you're right on the labeling. The body of the resistor appears to be gone. Good luck figuring out what value to replace it with.

Me personally, I'd either take the amp to a repair tech, send it back to the factory for a refurb or write it off.

 

[jrz126 10+ year member]

Its probably the resistor to drive the gate pin. I'd say it would be the same as the other resistors. and those look to be 100 ohms