Or, try lifting the power pins one component at a time. And if it buzzes it must be oscillating and should be viewable with your oscope.
Steve M. On Thu, 2007-09-13 at 20:42 -0400, Randall Nortman wrote: > On Thu, Sep 13, 2007 at 08:35:35PM -0400, evan foss wrote: > > I have had audio amplifiers and large transistors in general buzz on > > their own. Are you sure it is really on standby? > > One good way to address this and other such possibilities would be to > start de-soldering each component that is not strictly necessary to > drive the OLED. Do them one at a time, and test between each one. > Sounds like a fun way to spend an afternoon. If you have a spare > board and components, it might be easier to start from scratch, and > add one thing at a time. (Which would also help catch bad solder > joints.) > > If you get down to just the CPU, OLED, and required support > components, I would go so far as to remove the CPU and its required > components, and solder on wires to drive the OLED from off-board. > Then you'd have it pretty well narrowed down, I'd say. > _______________________________________________ geda-user mailing list [email protected] http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
