rockford fosgate BD1500 stopped working

[NauTech]

only thing i did since last time.. is remove the 8 FETs on the left to replace the 2 failed ones.. and changed the MIC4420CT thats it
I have measured every output FETs to see if they were short
I will measure the mic4420ct its the only thing left...

 

[NauTech]

as i have stated before.. could i only reconnect lets say.. the 2 black wires (leaving the 2 red wires disconnected) and see how much its pulling ? and do the opposite to see if its pulling... to determine on wich "side" + or - the current draw is ??
or will this blow something ...

 

[Perry Babin]

That won't work. Nothing on the red/black wires is connected to ground. They float and are alternately switched to ground by half of the output FETs.

Are you sure that you installed the 3415s and the 6215s in the correct locations?

 

[NauTech]

what
a
*******
dumb
***

....
I NOTICED how they were placed... the were "interlaced" if i may call it like this.. 6215 3415 6215 3415... its not like i didnt notice and did it randomly... and i FOUND A WAY... to install them backward... how stupid can i be...
this is so stupid... i want to shoot myself.. looking at the board right now.. i have
3415 6215 6215 3415 ... both 6215 are in the middle... IGFEOITOI#)TI@T)(IQ()EFI)SIQ#@) ...
can i have busted something ?

i was just measuring the output of the 2 MIC4420CT and the one on the left (U6)reads -9V when the protect led is on and +1.8V when the protect LED goes off.. and the right one (U10) reads -9V when protect LED on and -2.3V when protect LED off... is something busted or is it normal cause the twisted pairs are not connected??
anyways i will FIX MY STUPID MISTAKE...
it was so stupid... that is why it was hard to find...
props to you again !!

 

[seankane]

Should be in pairs of 4 fets. First 4 6215, second four 3415, third 4 6215, and fourth 4 3415.

 

[seankane]

Good possibility you have blown some of the output fets being in the wrong location.

 

[Perry Babin]

You probably didn't do any damage if the FETs aren't shorted.

Without the output stage working properly, the drive voltage after the end of the mute delay isn't easy to predict.

 

[NauTech]

I know Sean... thats the worst part of it.. I noticed this before removal and even in my head i KNOW they are in batch of 4's and i still found a way to install them backward... thats why i am SO angry at myself...
ill reverse them and let you know

Perry can i solder back the big twisted pairs after the output FETs installed correctly or would it be better to measure some things before ??
the mic4420ct's outputs are reading weird..

 

[NauTech]

allright... si there is no point in not connecting the big twisted pairs...
i put back everything together and see how much it pulls at idle and then i will let you know guys!!

 

[NauTech]

hey Sean
since you know my address...
can you send me a slap in the face USPS next day airmail!!!!
LOL

 

[seankane]

LOL I have done that one time, but I caught it before I powered up the amp. Get it fixed and keep us posted. It will probably be fine, just make sure you check for leakage after you de-solder them and after you re-solder them.

 

[seankane]

How about now........SLAAAAAAAAAAAAAAAP!!!!!!!!!!!!!

 

[Perry Babin]

After the FETs are reinstalled, you can reconnect the red and black wires.

This should not have damaged the drivers if the FETs didn't short.

 

[NauTech]

thanks Sean... I needed this!!!
allright lucky me i guess...
unsoldering now!!
see you soon... I hope this made you laugh

 

[seankane]

WELL?????

 

[NauTech]

everything is welded back together
just making all of the possible checks
legs together...
drain to heatsink..
checking everything
so far so good
about to power this baby again

 

[NauTech]

all gate resistors are OK
oh wait
ONE LAST CHECK
are all of the output FETs installed correctly ?...........
YESSSSSSSSSSSs

 

[NauTech]

pulling 2.30A on startup with the protect LED ON
pulling 3.20A when protect LED goes OFF

whats next..
confirm voltages on all of the gates?
checked voltage on the speaker terminal most of the time its 0V
1 or 2 times it went to somthing like -2.5V when connecting remote and +5v and slowly falling when removing the remote...

 

[Perry Babin]

Connect a speaker and see if it produces audio.

 

[NauTech]

cant i confirm more things before connecting speaker?
last time i did this 1 FET was busted and the gate driver was blown...