Rockford T10001BD blown output fet

[Perry Babin]

Have you carefully checked Q203 and Q206?

Have you confirmed that all of the resistors connected to those transistors are within tolerance?

[ComputerJLT]

q203 and q206 were replaced, along with r231 r234 r235. all values verified after the last failed attempt at fixing this thing. one was open causing the waveforms to be wrong.

waveforms on the gates of all 8 fets were verified w/ my scope before i even soldered in the new fets

[Perry Babin]

If the IRFP250Ns weren't the originals, there's no guarantee that they'll work. I think you need to go back to the original transistors to eliminate the replacements as a possible problem.

A 3 amp supply may not be able to power this up.

[ComputerJLT]

I cant find the originals and the supply powers it up w no output fets just fine

[Perry Babin]

The IRFP3415s were the originals in some of these amps and are readily available.

[ComputerJLT]

My next move is to put the 4 remaining good fets in the left bank which includes q208 and q209 and see what happens. Good original fets that is

[ComputerJLT]

So arrow and digikey can get them but they dont have stock. Mouser has em but theyre expensive. Anyone know of another reputable seller? Im not even gunna attempt ebay with all the counterfeit chips.

[Perry Babin]

Octopart
Octopart
Fairchild Semiconductor Mouser Electronics - Electronic Component Distributor 512-FQA28N15

[ComputerJLT]

thanks perry, i've never heard of octopart before

[Perry Babin]

It's on the DVD on the Semiconductor Datasheets page. I think I remember you ordering the tutorial.