Re: Monitor Problems

[Paul Grammens <pgrammen@sonic.net>]

Rubywand wrote:

>      This _may_ be fairly easy to fix.
> 
>      The IIgs monitor's HV module (the black thing with the anode lead going to
> the picture tube) is mounted to the motherboard in holes which are too large
> for the pins. As a result, many units develop solder fractures around the pins
> which lead to all sorts of problems for users including the one you describe.
>

Hi Rubywand,
that's the flyback transformer, which generates the horizontal sweep
signal and the high voltage. Cracked solderjoints would result in no
horizontal (i.e. a VERTICAL line on the screen) or no high voltage (dead
screen). Since Supertimer has a horizonal line on the screen, he has
both high voltage and a horizonal sweep, so that's not the problem this
time. 
The horizontal ciruit is the most prone to failure, since it does a lot
of hard work- the horizontal sweeps many times per vertical sweep. Often
the transistor that drives it overheats and blows.
-Paul