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

  • From: "tvservice" <tvservice@xxxxxxxxxxxxx>
  • To: <techassist@xxxxxxxxxxxxx>
  • Date: Thu, 20 May 2004 08:23:53 -0500

Some tv's use the same power source for vertical output and audio output, if
this is the case with your set I would start there looking for low voltages.
OSD  may be affected because of vertical problem
just my thoughts
Robert
tvservice@xxxxxxxxxxxxx
H & H Electronics Inc

----- Original Message ----- 
From: "peter" <pe.kow@xxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, May 19, 2004 6:45 PM
Subject: [TechAssist] Re: FW: Panasonic CT27G14A, Chassis AP330, (NA6DV),
Vertical, sound and OSD problem


> 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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