If you can find what the component is connected to that should make it fairly obvious...

Quote Originally Posted by 2e0poz View Post
My guess is that he put the supply wires around the wrong way. I want to replace this first before i can apply any power to it.
That's easily done as different drivers put them different ways round - if I recall correctly the 2M880n is the other way round. I've got some pictures of inside a 2m880N, but unfortunately they're mostly out of focus or too dark to see anything useful:

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Just out of interest which mosfets does the 2m542 you have use? The one I looked at has IRF9Z34N