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Burnt transistor with letters and numbers first row (IRFZ44N) second row (I R 544M) third row (03 65)

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Dude irfz44n is the transistor number... it is quite a common transistor... ask for it in the nearby electronics shop and fix the problem...

Posted on Nov 09, 2008

  • Paul David
    Paul David Apr 14, 2011

    still burnin them is it the resistors not workin causing this

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Hooking up the amp i had the ground wire connected and was going to hook up the power wire and it hit the case of the amp know the amp turns on but there is no sound from the speakers other amps work on...


sadly, your amps' output MOSFETS are more than likely toast.

your amp was grounded, and you touched the amp chassis with the power line.
electricity will follow any path available to find ground. in your case, the output mosfets became your main ground-path since they are directly connected to the amps chassis (heat sink) and internally you had grounded the amp so power would flow full force through the output transistors in the serach for a ground.

open up your amp and smell the row of MOSFET transistors. you'll probably even be able to see some burnt transistor legs.

repair or replace.

May 08, 2011 | Kenwood KAC-7202 Car Audio Amplifier

2 Answers

ALPINE MRV-T757, BRIDGED AND BLOWN


The problem is that the driver circuit is also damaged. Try powering up the unit with the output transistors disconnected. Measure each pad and report the results here. You should see something like 0.6,B+,0.0 on each set of three. Some will be negative rather than + (-0.6,B-, 0.0).

Keep us posted.
Dan

Jul 03, 2008 | Car Amplifiers

1 Answer

Need original part number for jl audio 1000/1


the ones directly across from the burnt ones is the same value

Aug 20, 2009 | Jl Audio JL1000 / 1 Car Audio Amplifier

1 Answer

KAC-9104D pops fuses at medium to high volume. worked fine in my car, and when i put it in my friends somehow it stopped working. coincidence or my fault idn but i need to figure out whats wrong. any help?...


make sure that the connected speakers have the correct impedance. should be 4 ohm typically. some amps support 2 and 1 ohm, too. wrong impedance could occur when you connect two speakers in a row for example. it's all about electric law.

Jul 23, 2009 | Kenwood KAC-9104D Car Audio Amplifier

1 Answer

Trying to find the right FET to replace burnt up ones with


hafler use international rectifier hexfets. there is alot of confusion what constitutes a mosfet amplifier.
if the outputs are mosfets instead of bipolar transistors, it is a mosfet amp.
some designs are using mosfets to drive the switch mode power supply,but use bipolar output transistors.that is not a true mosfet amp.
you need to go to an electronic supplier for the repair industry.
or the manufacturers warranty depot,who will be able to order them.mosfets are very high current devices,you have to ask ...why did they fail. if they are the switch mode drivers,there is bad capacitors in that circuit

May 23, 2009 | MTX Thunder 5-Channel Amplifier 895 Car...

1 Answer

T1500-1bd burnt mosfet


First of all is the mosfet your talking about in the output section or in the power supply section? Most car amps use mosfets in the power supply section, some use them in the output section. To test the transistors in your amp, take a digital volt meter and set it to diode check. Then take the leads and put them accross the first and third legs of the transistors. Usally the red test lead on the first leg and black test lead on the third leg of transistor. If you get a reading of 000 then transistor is shorted. If you get a reading below 600 then transistor is on it's way out if not allready or it's next to a shorted transistor that is it's complimentry output transistor. comonly you will have 2 transistors working together, one NPN and one PNP per a channel, or 4 of them in a bridged type output circuit depending on the watts and how man channels your amp has. I was just looking at the specs of this amp and it's got me confused. It says it's a 2 channel but looking at all the info on different pages it says at 4ohm:200wattsx4 and at 2ohms:300wattsx4 and 1 channel mono 600watts into 4ohms. weird for a 2 channel. anyway that is how you test your transistors. Same way for the power supply section but, you will come accross a couple or more switching diodes that look like transistors and you will get a 000 reading when you test those like I specified. They rarely go out and most of the time there is only 2 of them. They will have a diagram like a diode on the front showing you which way the power flows. Let me know what you find out. Your amp should have went to protect mode if you smoked a mosfet.

Feb 08, 2009 | Audiofonics ADF-243 Car Audio Amplifier

1 Answer

My american legacy amplifier


TH1 would be a termistor. How is it broken?

The IRFZ44N can be replaced with the following part from Mouser.com.
844-IRFZ44RPBF

You'll need to replace all of the IRFZ44 FETs.

Let me know if you have any other questions.

Oct 07, 2008 | Legacy Audio American Legacy II LA290 Car...

1 Answer

ZX-8100


I'm not familiar with that particular amp but generally, the only transistors that burn are the ones in the power supply. If the adjacent transistors had numbers like IRFZ44, IRF3205 or similar, the burned transistor is likely the same as the ones next to it.

Confirm that the center and right-most leg of the burned transistor and the transistor next to it are directly connected by large traces on the circuit board. Also confirm that the center leg goes to the large windings of the power transformer. If it passes these tests, the transistor is one of the power supply FETs. The numbers on the adjacent (parallel connected) parts will be the same as the burned one.

Jul 16, 2008 | Volfenhag ZX-8200 Car Audio Amplifier

1 Answer

Tengo problemas con mi amp..es un legacy LA930 400x2


revia el soporte de recistencia que tiene, algunos amplificadores no pueden funcionar a 2 ohms y pasa lo que a ti.

Feb 01, 2008 | Legacy Audio LA930 Car Audio Amplifier

1 Answer

Component for amplifier


All of the components with the IRFZ44N part numbers are the same. The rest of the information is the date/manufacturing code and isn't really important (although they should match if they were all used in the power supply). Digikey has them. The new lead free version is IRFZ44NPBF. The rectifier ->

Sep 17, 2007 | Audiofonics ADF-243 Car Audio Amplifier

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