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From: umrobbin@ccu.umanitoba.ca
Newsgroups: comp.sys.amiga.hardware
Subject: Snapping 1080 Monitor
Message-ID: <1991Jan10.065858.25700@ccu.umanitoba.ca>
Date: 10 Jan 91 06:58:58 GMT
Organization: University of Manitoba, Winnipeg, Canada
Lines: 20

I own one of the early versions of the 1080 monitor, which is prone to
snapping when there is a sound like a static discharge and the picture flicks
and sometimes rolls one frame.

In the October 1989 Amiga Transactor, there is a letter claiming that this is
caused by a high voltage anode wire and a heat sink acting like a capacitor;
when the heatsink charges up, it discharges to a ground strip on the circuit
board (to which the heatsink is attached with a metal twist tab).  The letter
says that they found traces from the discharges, and by cleaning them up,
cutting off the metal tab and insulating the wire, the problem cleared up.

I looked inside my monitor, and could find no trace of a discharge path on
the board.  Have other people fixed this problem in the same way?  Are there
other hypotheses about the cause of this snapping?

What effect does insulating the HV wire have?  (Surely there is no discharge
from the wire...?)

Steve Robbins
umrobbin@ccu.umanitoba.ca