16.007 How do fix a Flickering, Jumping, display which sometimes collapses to a line?
Description
This article is from the Apple II Csa2 FAQ, by Jeff Hurlburt with numerous contributions by others.
16.007 How do fix a Flickering, Jumping, display which sometimes collapses to a line?
If the monitor exhibits major flickering, periodic collapse of
the display to a line, etc., then it may help to know that a
common source of such problems is one or more bad connections
where the High Voltage module is joined to the main circuit
board. (This module is the black thing with a HV lead running to
the CRT-- it's near the left, back. The slotted nub controls in
its case set Focus and base Intensity.) Often these connections
look okay because it is hard to see the small fractures in the
solder surrounding the pins.
The cure is to resolder all of the pins coming from the module (on the
under-side of the circuit board). Before doing the soldering, clip a wire to
the metal chassis and touch the other end to each HV module pin and other
points in the area. While soldering, avoid touching anything conductive on the
monitor with anything but the iron and solder.
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