Hallo Philip,


> I have measured the voltages on the motherboard...

More important is the voltage at the input of the 7805 voltage regulators. 
IIRC that should be about 9 Volts. 
If that is near zero as well, it could be there is a shortage, or the 
transformer is dead.

Check the top right of schematic 
http://www.zimmers.net/anonftp/pub/cbm/schematics/computers/pet/2001/320008-
2.gif
Disconnect the power connector and check the AC voltage between pin 1 & 4 
and 5 & 4. IIRC should be about 12 volts AC.
Now you can check the diodes.
If all is OK so far, desolder the inputs of the 7805's and connect a 21 
Watt 12V lightbulb. Should burn without any problem. 
If no problem so far, connect the pins of the 7805's one by one. 

Keep us informed.


--
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  / /  |_/     Groetjes, Ruud Baltissen
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   \___|       http://Ruud.C64.org







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