Troubleshoot car amplifier "Renegade ren1100s mk2"

[Bastel1991]

Hey @all,

Im trying to troubleshoot the amplifier that's named in the title, the main fault is that it's literally destroying everything you hook up to it on the front channel, I checked with my multimeter the output and I get almost 21 volts without any signal that it could be amplified.

My first thought was that one of the 4 power transistors is gone bad, but I'm not really sure how to test them I tried various methods with the multimeter on diode test but if I done it right and my readings are correct 3 out of 4 power transistors are gone bad and somehow I can't believe this.

Can anyone give me a hint in the right direction?

Thanks for you time

[Ysjoelfir]

Hi,
why do you think this can't be? It is a fairly common fault that the power transistors blow up, so no problem with that.
But how did you test those?