"Jerry" wrote in
:

Thanks Larry for the very informative feedback but the problem goes
further than that and maybe I didn't explain myself clearly enough.
If I'm watching the screen scrolling by with fish or not, all of a
sudden the display ends with a dark vertical black line and just a
clear empty screen following it. I can stay clear for a 1/4" width or
a 1" width up to a full screen width before I see another dark
vertical line followed by the normal display of the bottom and fish if
there are any. It has gotten so bad that I'm now getting a 1/2" of
display, a vertical line followed by a 1/2" of blank screen, a
vertical line, then another 1/2" of display, then a vertical line
followed by a 1/2" of blank screen, a vertical line, and this may go
on repeatedly forever. Sometimes if I shut it off and wait awhile it
may work okay for a minute or so and then it starts to act up again.


Another thought came to mind. The display is stored in a memory IC for
the display. It is being written in order from top to bottom along the
right side of the display as you look at it, then on each time the
display moves, those little jerks they all do, that line and all the
lines before it are jogged one line to the left, making room for the next
line. If that memory chip, or the driver to it, is overheating, it will
also make a moving blank or black vertical section for as long as it's
blanked out.

Tell the factory to HEAT this unit up when you send it back to them.
They'll have a heat box to try to create the overheat condition I think
you have. They may simply choose to replace the whole unit, rather than
attempt a repair at all, saving the company more money in technician
labor costs than the unit costs them to buy from China or wherever the
slaves make them. Garmin, Eagle and the others do it all the time on
difficult, intermittent problems.



--
There's amazing intelligence in the Universe.
You can tell because none of them ever called Earth.