[Icom] IC-756 Display

[Dan Doss]

Hi Sean,

I can't give you any first hand information about the 756 LCD, but I can
tell you that more times than not, my experience with flakey LCD's has been
that the connections to the LCD were at fault. Specifically, if the LCD
glass itself is connected to the ribbon cable, etc. via a rubberized
material (called a "zebra strip" in the industry), the problem can often be
solved by simply removing the LCD glass from its conductive rubber "zebra
strips" and giving everything a good cleaning with a mild solvent such as
alcohol. I too have a 756 (non-pro) and have not yet experienced this
anomaly with the LCD, but if/when I do, the first thing I will attempt is
just what I described.

Next problem - the tuning encoder. Don't be to hasty on  shelling out $70
for a new encoder. If the frequency won't change at all (any digits), then
it _might_ be a problem with the encoder. Otherwise, the fact that only the
last two digits "freeze" is more likely to be an intermittent connection or
component that is specifically related to the "TS" key functionality. Off
hand, other than the TS key itself, I can't think of what it might be. Take
a look at the schematic - something might be obvious if you look in this
area. If I'm not mistaken, the tuning encoder provides the same two
quadrature pulses to the micro no matter what frequency resolution you have
selected.

Best of luck!

73 de Dan
KG0MM

At 08:50 PM 1/31/2002 -0000, you wrote:
>This is my first post to the list so apologies as I am probably asking a
>question which is 'old hat' to others
>I have an IC-756 (serial number 03372).  In the recent past five horizontal
>blue lines have appeared across the top inch or so of the LCD and remain
>there while the rig is on.
>I have been told that the only cure for this is to replace the LCD unit.  I
>have been quoted =A3240 sterling ($345 US) parts and labour plus carriage=
 to
>the UK to put it right.  Icom UK have quoted me =A3177 sterling ($254 US)=
 for
>the display unit and fit it myself.
>I would ask people who have experience of this problem
>(1) whether replacing the LCD unit is the only cure or could the display
>driver be faulty
>(2) Is it reasonably easy for the average amateur to fit th LCD unit
>himself/herself
>(3) How likely is the problem to recur - in other words is it worth fixing
>it
>(4) Do the prices seem right
>The final two digits in the frequency display lock intermittently.  I
>believe this is a problem with the shaft encoder which needs to be replaced
>also.  I can get the necessary part from Icom UK for =A347 sterling ($70=
 US)
>Please reply off list to avoid boring others with what may be a well worn
>question.
>
>Sean EI7CD
>
>----
>Your Moderator: Dick Flanagan W6OLD, icom-owner@mailman.qth.net
>List Archives : http://mailman.qth.net/pipermail/icom/
>List Control  : http://mailman.qth.net/mailman/listinfo/icom/
>