Ragnar,
I don't really like the sound of having voltage at the Compressor and nothing happening.
It sounds to me like the Start winding in the Compressor has gone Open Circuit and there is nothing that can really be done about it.
Compressors in fridges are usually run by a Split-Phase motor and depending on the size of it, the Current Held relay and Capacitor are often sealed inside the Compressor body.
Unless you replace the compressor, it looks like this is the end of the road for this old beauty [Linked Image], but even replacing the compressor is not really an option, because of the likelihood of the residue from the old Freon gas reacting with the new charge of non-CFC refrigerant, this can have explosive results.
I hate to be the bearer of bad news, mate, but that's just my opinion of the situation.
[Linked Image]