[TechAssist] Re: FW: Panasonic CT27G14A, Chassis AP330, (NA6DV), Vertical, sound and OSD problem

  • From: "peter" <pe.kow@xxxxxxxxxxxx>
  • To: <techassist@xxxxxxxxxxxxx>
  • Date: Wed, 19 May 2004 19:45:27 -0400

Art I haven't got a schematic for this set that I am aware of and don't know
if this might be a solution but a number of years ago we had problems with
Tosh TV's that would have strange symptoms that would make you believe that
there was a fault with the CPU. We found that the problems were caused by a
number of .01 disc caps that either had heated up and gone leaky or had
small cracks in their cases allowing a bit of moisture to enter. These caps
were invariably on data lines and caused numerous strange symptoms.  Peter
Kowalik  pe.kow@xxxxxxxxxxxx   Keith's Stereo  Burl On

-----Original Message-----
From: techassist-bounce@xxxxxxxxxxxxx
[mailto:techassist-bounce@xxxxxxxxxxxxx]On Behalf Of Art Bevilacqua
Sent: May 19, 2004 9:26 AM
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] FW: Panasonic CT27G14A, Chassis AP330, (NA6DV),
Vertical, sound and OSD problem

This set is driving us crazy - it came in because vertical would pull in
after the set was warm. We also observed that after running a while, the =
on
screen display would break up into "hash", sprayed across the screen, =
and
sometimes the sound would go all the way up. When the sound would go =
wild,
we would loose control of the set through the front buttons until the =
set
was unplugged or cooled down.

I replaced the microprocessor and it ran for three days only. My father =
has
been heating and cooling (and replacing) other parts in the micro area, =
such
as the eprom and the combo filter chip. Still, heating and cooling =
almost
anything in that area causes the problems to come and go.

I discovered that heating and cooling from the bottom of the board also
affects things, but I haven't been able to isolate it to a single part.
Everything has been resoldered. There are not any glue deposits under =
there
that we can see.

Has anyone experienced this with one of these before? Thanks,

Art Bevilacqua
Essex Radio and TV
40 Main Street
Essex, MA 01929





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