On Feb 17, 2:00 am, wrote:
Hi again,
I was wondering, what could have caused all 4 rectifier diodes to
short?

could be several things - mains surge, bad ptc, bad chopper, shorted
mains capacitor... being common reasons in my experience. usually,
however, a fusible resistor opens first in the case of problems
further into the power supply .
-b