Rockford 360.6 - blown power supply MOSFETs

pac1085 · 17th October 2012, 07:34 PM

Hi, I have a rockford 360.6 with blown power supply MOSFETS. The amp blew when I was re-routing some wires in the front of the car a few years ago. Possibly related to the pre-amp inputs or +12v remote turn on wire?

I have some basic electronics knowledge, and tried replacing all of them (Motororla MTP50N06V) and as soon as I applied power the new ones burnt up.

Does anyone have a schematic for this amp, or any guidelines on where to look?

Thanks!

Perry Babin · 17th October 2012, 10:07 PM

If you haven't done so, read the entire basic amp repair page (link in sig line below). That will help you with the basics.

seankane · 18th October 2012, 06:41 AM

Did you make sure the gate resistors for the power supply fets were within tolerance and had a good connection?

Did you replace the pnp and npn driver transistors for the power supply fets?

Also did you confirm there were no solder bridges between the legs of the power supply fets?

Post a pic of the board where you did the repair.

I think I have the schematic somewhere I will look.

pac1085 · 19th February 2013, 04:28 PM

Hi guys...

Thanks for the insight. After posting this thread, I noticed a burnt trace on the board near the power supply PWM controller chip.

Here are some pics:

Are there any equivlent replacements for the MTP50n06v that I can use?

seankane · 04:44 PM

You can still purchase those MTP50N06V's brand new.

I would use IRF3205 and change the gate resistors to 47 ohm.

Also you need to change the drivers to after a second failure they are sure to be shorted.

Looks like in the pic they would be marked 1GM and 2GM which are MMBTA56 and MMBTA06. The transistors in location Q4, Q5, Q6, Q7.

seankane · 19th February 2013, 04:47 PM

E-mail me at seankane89@hotmail.com if you want the schematic.

pac1085 · 19th February 2013, 04:48 PM

Thanks for the info. Do you have any ideas why the trace near the PWM controller could have blown? Do you think it could have been related to static in the remote turn on line?

17th October 2012, 07:34 PM	#1
pac1085 diyAudio Member Join Date: Oct 2012	Rockford 360.6 - blown power supply MOSFETs Hi, I have a rockford 360.6 with blown power supply MOSFETS. The amp blew when I was re-routing some wires in the front of the car a few years ago. Possibly related to the pre-amp inputs or +12v remote turn on wire? I have some basic electronics knowledge, and tried replacing all of them (Motororla MTP50N06V) and as soon as I applied power the new ones burnt up. Does anyone have a schematic for this amp, or any guidelines on where to look? Thanks!

17th October 2012, 10:07 PM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	If you haven't done so, read the entire basic amp repair page (link in sig line below). That will help you with the basics. __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

18th October 2012, 06:41 AM	#3
seankane diyAudio Member Join Date: May 2010 Location: Washington State	Did you make sure the gate resistors for the power supply fets were within tolerance and had a good connection? Did you replace the pnp and npn driver transistors for the power supply fets? Also did you confirm there were no solder bridges between the legs of the power supply fets? Post a pic of the board where you did the repair. I think I have the schematic somewhere I will look. __________________ Pyramid 52 Amp Power Supply----Fluke 787 Processmeter----Tektronix 465 Scope----Velleman HPS40 Scope----Soldering Iron----Desoldering Iron----Hejet HJ 500-S Heatgun----DM4070 Digital LCR Meter----Propane Torch

19th February 2013, 04:40 PM	#5
seankane diyAudio Member Join Date: May 2010 Location: Washington State	You can still purchase those MTP50N06V's brand new. I would use IRF3205 and change the gate resistors to 47 ohm. Also you need to change the drivers to after a second failure they are sure to be shorted. Looks like in the pic they would be marked 1GM and 2GM which are MMBTA56 and MMBTA06. The transistors in location Q4, Q5, Q6, Q7. __________________ Pyramid 52 Amp Power Supply----Fluke 787 Processmeter----Tektronix 465 Scope----Velleman HPS40 Scope----Soldering Iron----Desoldering Iron----Hejet HJ 500-S Heatgun----DM4070 Digital LCR Meter----Propane Torch Last edited by seankane; 19th February 2013 at 04:44 PM.

19th February 2013, 04:47 PM	#6
seankane diyAudio Member Join Date: May 2010 Location: Washington State	E-mail me at seankane89@hotmail.com if you want the schematic. __________________ Pyramid 52 Amp Power Supply----Fluke 787 Processmeter----Tektronix 465 Scope----Velleman HPS40 Scope----Soldering Iron----Desoldering Iron----Hejet HJ 500-S Heatgun----DM4070 Digital LCR Meter----Propane Torch


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19th February 2013, 04:28 PM	#4
pac1085 diyAudio Member Join Date: Oct 2012	Hi guys... Thanks for the insight. After posting this thread, I noticed a burnt trace on the board near the power supply PWM controller chip. Here are some pics: Are there any equivlent replacements for the MTP50n06v that I can use?

19th February 2013, 04:48 PM	#7
pac1085 diyAudio Member Join Date: Oct 2012	Thanks for the info. Do you have any ideas why the trace near the PWM controller could have blown? Do you think it could have been related to static in the remote turn on line?

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