In the early 80s there was a video game manufacturer that had this
exact problem - their power supplies would fail, placing 18 volts on
the output, and thus frying the video logic. So, yes, it is quite
possible for them to fail "full bore."
The company is no longer in business...
As a further note, the supplies showed up in Radio Shack sometime
later where everyone who purchased one of the boards got to see the
problem for themselves. At least R.S. was smart enough to label them
as surplus...
On Nov 6, 2007, at 7:35 AM, Tom Hammond wrote:
Folks:
A local discussion has 'erupted' regarding switching poser supplies
and whether
they can fail in an UNregulated (e.g. high) output voltage
condition, or if
when they fail will they (almost) always fail in a NO OUTPUT mode?
I think this discussion may have been started as a result of a
subject here on
the reflector about overvoltage protection (OVP), but it's managed
to take on
a life of its own with respect to the MODES in which a switching P/
S can/will fail.
Anyone have enough real experience to express their thoughts on
this subject.
Must admit... I have no clue myself. I've 'heard' that most
switchers fail in
the NO OUTPUT mode, but this is strictly hearsay.
Let's try to get several responses and the let the subject drop
before IT takes
on a life of its own on the reflector and Eric has to step in...
he's busy enough
right now. <G>
73,
Tom N0SS
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