Anybody wanna offer an idea? in this Amp board?

[Evnldr]

Here are the pics...
It is a car amp it made a high pitch noise and smoked, it was not running hard actually at 10% volume to stock speakers... here is the bad board... the fets are done... burnt,, you think it is fixable>? Or is it to bad...?

Any idea on where to get fets?

Irfz44n 238g 3a f8

[japlytic]

Re: Anybody wanna offer an idea? in this Amp board?

It is a car amplifier board, with a DC-DC converter on it. The IRFZ44N is a 55V, 0.0175 Rds(ON), 49A unit, and it appears they are used in the DC-DC converter section.

Also, it would be more helpful if you specify the make and model of this amplifier.

https://cdn.badcaps-static.com/pdfs/...c695177d95.pdf - IRFZ44N datasheet

[Evnldr]

Re: Anybody wanna offer an idea? in this Amp board?

It is a car amplifier board, with a DC-DC converter on it. The IRFZ44N is a 55V, 0.0175 Rds(ON), 49A unit, and it appears they are used in the DC-DC converter section.

Also, it would be more helpful if you specify the make and model of this amplifier.

https://cdn.badcaps-static.com/pdfs/...c695177d95.pdf - IRFZ44N datasheet

I did not think model info would help anybody but Cool!
it is a US Acustic usb2150 But it has a USX2150 Board ..

So IRFZ44N is the part number? I will order them...

[Topcat]

Re: Anybody wanna offer an idea? in this Amp board?

Replace the ALL the FET's and check the load resistors (replace if necessary, but they look ok). Then check diodes in the primary.

That's an easy fix.

[Evnldr]

Re: Anybody wanna offer an idea? in this Amp board?

there is like 23 Fets,,, Or just replace that set.. the 4 on each side of the board (same Value) 4 bad and 4 good.. rather than re fet All of them.. 46$ is kinda steep lol

[Topcat]

Re: Anybody wanna offer an idea? in this Amp board?



Replace all the FET's with the 'X', even if they check good on a VOM. Also, check the resistors directly in front of the FET's. Most likely the resistors are ok, as they'll usually incinerate themselves if they overloaded when the FET's went. Also check that big fat diode for shorts. The torriod coil didn't fry, so the damage was minimal.

[linuxguru]

Re: Anybody wanna offer an idea? in this Amp board?

If those large caps are Samwha, replace them as well with Panasonic FC or Nichicon PW. Small caps can be replaced by Elna ROS or maybe even el-cheapo Elna RE2/RE3.

[gonzo0815]

Re: Anybody wanna offer an idea? in this Amp board?

If those large caps are Samwha, replace them as well with Panasonic FC or Nichicon PW. Small caps can be replaced by Elna ROS or maybe even el-cheapo Elna RE2/RE3.

That is, what inwould suggest too. I would using Panasonic FM on this kind of applikation. This would probably improve the sound quality too.