Re: Monitor Problems

[Rubywand <rubywand@swbell.net>]

Paul Grammens writes ...
> 
> 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.
 ....

     Logical, but not in line with experience. The module includes more than
just the flyback transformer. One symptom of a loose GS monitor HV module
connection can be a display which collapses to a horizontal line.

     Agreed, some V-sweep component may be responsible. However, a bad solder
connection to the HV module is a well-known source of problems on the GS
monitor.




Rubywand