Amp repair looking for help, amp goes into protect with good fets

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ryley_999

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Joined 2009
#1
bought an amp for cheap because it was broken, figuring it was the typical problem i ran into, (output fets) anyways, i found two blow fets, pulled them all out, turn the amp on, its doesn't go into protecting, as soon as i put even one good fet into it, it goes into protection, so im thinkin when the fet blew it took something with it, with all fets out i turned on the amp, measured the pads where the fet would be installed, and im getting 50volt on the source and gate pads,

so i am assuming whatever is driving the outputs is gone too, and is just dumping voltage into the gate signal. but im an not a pro, if someone could point me in the right directing it would be greatly appreciated,

the amplifier is a kaption dz-2000.1
 
#2
also, when i test the fets, after i arm them, i test the drain ability, and it mesures .34 volt and rises which i figured is weird, some measure .27 volt, i taped my finger between the source and gate and they didn't discharge voltage stays the same,

i used this method to get the results above -> Desolder and Test the Field Effect Transistors (MOSFET) in your amplifier | Decibel Car Audio the SPL Knowledgebase im wondering if the votage reading im getting is the actual test voltage from the dmm

when i use this method i get nothing at all -> Testing a MosFet

figured i would say something about how im testing my fets, because i could just be beating my head all the wall because of my inability to read lol,
 
#4
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An externally hosted image should be here but it was not working when we last tested it.


im assuming the ic would be this bad boy circled in red?
 
#6
nigelwright7557 said:
That looks like the main driver.
The 8 pin IC to the left of it might be gone too.
Its a shame the numbers have been scraped off.
Click to expand...


yea my typical luck, the guy i got this off of, im pretty sure still has another one, so im gonna ask him and see if hes nice enough to open it up and take a pic for me or tell me what they are :s, i also emailed kaption, but yea im guessing thats gonna be hopeless lol, ,
 
#7
so i managed to get the part number off the small ic, aparently it is an opamp, i also removed the driver board and now there isn't any rail voltage at the gate pads, so now i am just waiting for the company to get back to me about trying to find the part number of the other ic
 
#8
so kaption got back to me about my problem, they told me they dont carry the parts for this amp anymore, and they scratched off the part number to protect the some licencing crap about the ic manufacturer. then goes on to refer me to someone who may be able to fix it, wtf!?!, how is he supposed to fix it if he cant get the ic number either

is he selling me bs about the scratched off number? does anyone know what hes talking about?
 
#9
ryley_999 said:
so kaption got back to me about my problem, they told me they dont carry the parts for this amp anymore, and they scratched off the part number to protect the some licencing crap about the ic manufacturer. then goes on to refer me to someone who may be able to fix it, wtf!?!, how is he supposed to fix it if he cant get the ic number either

is he selling me bs about the scratched off number? does anyone know what hes talking about?
Click to expand...

See if you can message or otherwise ping Perry Babin. He knows about these amps. The scratched off numbers are very common parts - it was done to prevent simple cloning by other manufacturers, but that didn't stop anyone. 😉

I bought his 2008 version of the bcae Car Audio Tutorial, but it doesn't have this sort of amp in it. So I am of no help. 🙁
 
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