On Sat, 03 Feb 2018 05:21:56 +0000, The Natural Philosopher wrote:

No: By and large the chips don't blow, There is usually a chopper power
MOSFET and that is what takes the strain if a diode goes bad.

True, but some older ones use power bipolar junction transistors for a
chopper.


Replace diode, 450V cap and power FET and fuse and it should work

I should mention at this point that SMPS units are highly dangerous to
work on live. Some have voltages close to 800V at more than enough
amperage to kill. If you cannot avoid live testing then FFS use an
isolation transformer and keep one hand behind your back all the time
you're prodding around.



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