Re: IIgs cpu: RGB ok -- no composite video output

[Rubywand <rubywand@swbell.net>]

stephen e buggie writes ...
> 
>         I got a IIgs that PASSES the internal self-test.  The only fault
> is that the composite video (RCA socket) gives no output.  The RGB db-15
> output is perfect (Thank goodness!).
> 
> Any suggestions for trouble-shoting the composit video output????  Steve
 ....

     If you have more than one composite monitor, try swapping monitors.
Also, try swapping connector cables. Some monitors may need to be
adjusted to get a display-- so, diddle Intensity, Brightness, and Input
Level (if there is such a control on your monitor).

     If no composite monitor works with the GS, you could use a 'scope
and hunt for a signal using the GS schematic. For example, if you find a
signal going into the output transistor's Base and zilch coming out, a
bad transistor is a fairly good bet.



Rubywand