Aura amp

mike49504 · 21st April 2010, 02:13 AM

I recieved this amp in for repair. on legs 1 to 2 of the power supply fets is reading shorted. And also across Power and ground is reading shorted.

so i pulled the power supply fets,rectifiers,power supply driver board,and the large diode and the drivers for the power supply fets.

Still reading shorted across power and ground terminals.

Wondering what could cause this??

Perry Babin · 21st April 2010, 02:29 AM

Do any of the components you pulled read as shorted?

mike49504 · 21st April 2010, 02:48 AM

Power supply fets read shorted.

Perry Babin · 21st April 2010, 04:27 AM

It's unlikely that anything left on the board is shorted. Clean the board thoroughly to remove all of the flux and examine the entire power supply area to see if there are any solder bridges.

mike49504 · 21st April 2010, 04:31 AM

Since i took the rectifiers out and it still reads shorted the problem is in the power supply or could it still be in the output section?

Perry Babin · 21st April 2010, 06:00 AM

It's almost certainly in the power supply area. The most likely areas to be shorted are around the power/ground terminals or on the FET pads.

mike49504 · 21st April 2010, 02:24 PM

Ok cleaned the board off in the power supply section now it doesnt read shorted Thanks Perry.

The orginal fets are IRFZ44A's will the 44n's work?

Perry Babin · 21st April 2010, 05:50 PM

I can't find a datasheet on the Z44A but I'd expect the Z44N to work properly.

21st April 2010, 02:13 AM	#1
mike49504 diyAudio Member Join Date: Sep 2006	Aura amp I recieved this amp in for repair. on legs 1 to 2 of the power supply fets is reading shorted. And also across Power and ground is reading shorted. so i pulled the power supply fets,rectifiers,power supply driver board,and the large diode and the drivers for the power supply fets. Still reading shorted across power and ground terminals. Wondering what could cause this??

21st April 2010, 02:29 AM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Do any of the components you pulled read as shorted? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

21st April 2010, 04:27 AM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	It's unlikely that anything left on the board is shorted. Clean the board thoroughly to remove all of the flux and examine the entire power supply area to see if there are any solder bridges. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

21st April 2010, 06:00 AM	#6
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	It's almost certainly in the power supply area. The most likely areas to be shorted are around the power/ground terminals or on the FET pads. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

21st April 2010, 05:50 PM	#8
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	I can't find a datasheet on the Z44A but I'd expect the Z44N to work properly. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links


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21st April 2010, 02:48 AM	#3
mike49504 diyAudio Member Join Date: Sep 2006	Power supply fets read shorted.

21st April 2010, 04:31 AM	#5
mike49504 diyAudio Member Join Date: Sep 2006	Since i took the rectifiers out and it still reads shorted the problem is in the power supply or could it still be in the output section?

21st April 2010, 02:24 PM	#7
mike49504 diyAudio Member Join Date: Sep 2006	Ok cleaned the board off in the power supply section now it doesnt read shorted Thanks Perry. The orginal fets are IRFZ44A's will the 44n's work?

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