amp shuts off whenever the speaker is hooked up

[boldpartymix]

Hello,

I have a PPI pc275 that is at least ten years old. I recently replaced a fet transistor that had popped due to a bad ground. Whenever I hook my 12" alpine rseries, the amp completely turns off. Not just in protected. Any help would be greatly appreciated!

Thanks!

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[Jepalan]

Use a DMM to measure the resistance of your sub - just to make sure it is good.

Can you try a different sub?

Probably missed something when you repaired the amp, or maybe have a solder bridge when you replaced the FET?

 

[Side Show 10+ year member]

pics of cooked amp

 

[boldpartymix]

http://imgur.com/Kmx9QED,wJ1bWAg,bBSGT1X#0

http://imgur.com/Kmx9QED,wJ1bWAg,bBSGT1X#1

the fet that is second from the left is the one that popped. looks like it did it again.

http://imgur.com/Kmx9QED,wJ1bWAg,bBSGT1X#2

 

[boldpartymix]

as i was soldering the new one one i checked the resistance and continuity of the gateway resistors and every capacitor. Could it be that the transistor is grounding to the heatsink underneath?

 

[Side Show 10+ year member]

proberly.... worth a shot... theres not really that much damage to the board.... have you made sure you used the correct parts when replacing (correct values ect)

 

---------- Post added at 02:21 AM ---------- Previous post was at 02:20 AM ----------

 

have you tried another speaker? or checked your speaker wiring?

 

[boldpartymix]

They are IRFZ22N's.

hooked it to my boss onyx and the same thing happened.

ground is straight it the body and battery is feeding 14V.

At first i thought that my capacitor was giving it too much power, or that it shorted it.

I wired it in without the capacitor and a new FET and the same one popped again. What would cause an output transistor to short?

 

[Side Show 10+ year member]

*best off asking the amp techs*

or better yet take it to some1 to fix for you, that knows what they are doing