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- Xref: sparky comp.sys.ibm.pc.misc:12621 comp.sys.ibm.pc:540
- Path: sparky!uunet!munnari.oz.au!uniwa!uniwa!nfm
- From: gude@uniwa.uwa.edu.au (David J W Emrich)
- Newsgroups: comp.sys.ibm.pc.misc,comp.sys.ibm.pc
- Subject: Re: Help!..NEC Multisync Keeps Blacking Out!
- Date: 14 Sep 1992 20:08:59 +0800
- Organization: The University of Westrn Australia
- Lines: 47
- Message-ID: <191vcrINNkqa@uniwa.uwa.edu.au>
- References: <1992Sep14.015845.13417@leland.Stanford.EDU>
- NNTP-Posting-Host: uniwa.uwa.edu.au
-
- 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
-