MTX RT251D Getting 40V across speaker terminal

[turbosundance]

I have a MTXRT251D at home that I got off ebay a while back. It hooked it up to a cheap woofer when I got it and when I turned it on it promply cooked the voice coil in the woofer. I put a meter across the speaker terminals and I got 40VDC. The are no visibly bad chips inside the amp. Where should I start on this one. I'm used to working much less congested amps, I've never touched a class D ap before though. This is a mono amp.

 

[Tekko]

The output fets are most likely blown, but it could also be busted gate drivers or something else that makes the fets get turned on constantly.

Unfortunately there is not mutch you can do without a scope.

 

[turbosundance]

Can a PC soundcard scope be used to test this? I've heard a bit about using a soundcard as a scope but I dont know much about it. Is there a place to get more info?

 

[fredos]

If you do that, dont forget to pad with resistor the input of your sound card...And lift the ground of your amplifier to avoid power short to your computer...And last but most important..Do it with old not used computer!

Fredos

www.d-amp.com

 

[Formas]

On this same amplifier can some one tell me what's the marking on device for D118 and D119 or what is the equivalent. (I think they are Zener diodes but what value?)