ARW wrote:

The LEDs (charging, fully-charged) are both off. There is no voltage at
the charger's output, which is why I opened it up to find out if I could
where the fault is.

I would not expect an output from the transformer unless there is a load
on it. And the load would be detected by the components on the PCB.

That surprises me. I would have expected to see 18V or whatever on the
output side leads, *unless* something in the PCB were shorting them (and
in which case, I would expect the fuse to have blown).

Daniele