In article , William Sommerwerck
writes

This is a common problem in servicing. As an EE, I want to know exactly why
something isn't working correctly. But I learned a long time ago that it's
more important to simply get the damned thing fixed. If that means
shotgunning likely components, so be it.

If you're fixing stuff regularly, particularly many of the same item,
it's worth diagnosing the problem so that in future you can say, "oh,
that model, that fault, it's C35", and replace that - saving time and
the cost of replacing components unnecessarily.

--
Mike Tomlinson