Help needed to verify place for Tip141/142 pairs

I have a sub woofer power amplifier in my car.

The output transistors blew off due to some reason,
i replaced them but am not sure whether they are in the right place, coz when i switch on the sub, i see fumes comin out...

can u suggest me a way by which i can check and rectify the places......

It's no good just replacing the output transistors, usually other components are damaged as well - you need to find and replace ALL faulty components. If you have replaced just the output transistors the new ones are probably blown now as well.