🚀 go-pugleaf

shedevil@leland.Stanford.EDU (Anne P. Mitchell, JD) writes:



>Help!..my old NEC Multisync [it's a really old one...or rather, not a
>new, current model at least] has developed a most annoying habit...every
>so often [more and more often :-(] it just goes black.  Totally.  Almost
>like there is a screensaver enabled, but there isn't.  In order to get
>my screen back I have to shut the monitor off [the power switch in the
>rear] and turn it back on.  Sometimes I have to do it a few times.

>I *know* it is the monitor, because I hooked up another monitor to my
>system, and it did not do the same thing.

>What is wrong with my monitor??...and more importantly...can it be
>fixed???

>Thanks!

The problem is in the power supply section of the monitor.  Like the PC
itself, the monitor has a switchmode power supply, and it has several
over current, and over voltage protection circuits built in.  If any of
these circuits detect that the voltages or currents are going out of
range, they shut down the whole power supply, and thus the monitor
"blacks out".  There are two reasons that the circuits might be shutting
down the power supply: first, there is a real problem, something in the
monitor is loading it down too much, (usually a faulty compnent).
Second, the ciruits that detect out of range voltages and currents could
be faulty themselves.  

The reason it does it "intermittenly" is probably due to heat.  As the
monitor warms up, one of the components (or more) goes "funny" and when
the fault happens, the only way to reset it is to turn off the monitor
and let it cool down a bit.
 
Either way, the only way to get it fixed, is by someone who is competent
with monitors and/or TVs.  It is fixable, but depending on what
component is going funny, the cost could be anything from one hour's
labor to a whole day and a cople of hundred dollars for bits.

The only way to get a cost estimate is to put it in for service and get
a quote.


[dav]    aka
David Emrich
gude@uniwa.uwa.edu.au