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From: sah@cs.purdue.edu (Sean Hershberger)
Newsgroups: comp.sys.sun
Subject: Hitachi 19" monitor - squeal from POWER SUPPLY.
Keywords: Hardware
Message-ID: <1990Aug23.225027.9650@rice.edu>
Date: 15 Aug 90 16:59:20 GMT
Sender: sun-spots-request@rice.edu
Organization: Sun-Spots
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Approved: Sun-Spots@rice.edu
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X-Sun-Spots-Digest: Volume 9, Issue 307, message 10

I've been maintaining Sun equipment for over a year and have seen a common
failure mode for the Hitachi 19" Monochrome monitor.  When this failure
occurs there is a high pitched squealing coming from the power supply
module in the monitor.  (No, it is not the flyback transformer.)  It is
often an intermittant problem which can be temporarily "fixed" by power
cycling the monitor.

Does anyone here recognize this problem and know the solution?

Thanks in advance.

Sean Hershberger		sah@arthur.cs.purdue.edu
Hardware Engr.
C.S. Dept.			Purdue University