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From: Dave_s on 14 Apr 2005 16:56
My 440 Handy Talkee [HT], a Realistic HTX-404, has been sitting without
operating for 6 months. Now, the LCD display has a cluster of black
shapes centered vetically and in 3/8 inch from left edge even when the
HT is off or on. How can I makes these unwanted shapes go away?
Appreciate any hints. Thanks, Dave_s, 73, W6MIK.
From: Edd Whatley on 14 Apr 2005 22:41

Now Dave, are you ýrat sure that those are positioned ýveticallyý ? Now
by my being blind to your
situation , e.g., not having the unit in hand for an eyeball QSO, could
you confirm that that
condition is maintained even when there is no power or batteries in the
unit.
(And even that thought process could be flawed in the respect of
retentive charge in the ua
current levels and low voltage levels still being maintained by
capacitive elements in the radio
for some time period after unpoweringý..still adequate to effect a
display action)
Also, was there any possibility of errant electrolyte seepage from
defunt batteries involved.
My thinking would lean towards a contamination of a string of pixel
elements in the LCD array
to cause that effect. Or, my most common finding is a loss of
connectivity thru a connector to
the array.
This can usually be confirmed by powering up the display and enacting a
moderate pressure to
the x-y planes of the displays front bezel assembly, hoping that will
transfer enough movement
to the internal connector area to cause a corrective action in portions
of the display, thus tipping
you off as to a display connection being the problem. Donýt..rptýDONýT
exert pressure to
the threshold of fracturing your displays glass front face, however.
Also there might be the possibility of pressing on the rear of the
displays contact area via an
orange stick, wood dowel, etc., if access was obtained to inside the
receiver housing after a partial
disassembly. Should you find a corrective manner by pixels changing in
that prior probing procedure,
the most common cause of that condition is the manner of construction
and the specific materiel
utilized in interfacing to the display. If you stored that unit in a
heated environment (sun ravaged
car or storage building, etc)ý..it is also more abject to failure.
Should this exploratory action have
changed the display, get back to me and Iýll update you on what I
usually find that fixes the situation.
73ýs de Edd


--
Edd Whatley
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