[TechAssist] Re: Panasonic CT31XF32CT chassis ALEDP240C
- From: "Paul Westcott" <westcott@xxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 6 Aug 2003 23:33:26 -0400
Dan,
I really didn't notice a loss of vertical,but then again
I wasn't paying attention as I was looking at the screen
from a mirror.
As far as your repair, a lot of sets need the vertical and horizontal
blanking pulses to process the video.
I,m assuming that a fault in the vertical might be enough
to affect the vert. blanking pulse.
Years ago,RCA had a sandcastle pulse that was the
combination of the horiz. and vert. pulses.
If either was missing, there was no video.
I,ll take a closer look at the vertical tomorrow.
Will post if I find the fix.
Paul.
----- Original Message -----
From: "Webster TV" <webstertv@xxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, August 06, 2003 9:39 PM
Subject: [TechAssist] Re: Panasonic CT31XF32CT chassis ALEDP240C
> Paul,
>
> Do you have any vertical symptoms, like lack of height or vert. retrace
> lines at top of picture. I had a # ALEDC 200 once that had no video, color
> only, looked negative, but when you turned the color up higher you could
see
> a black margin(approx. 2") at top of screen and also a few retrace lines.
> Replacing Vert. Output, IC 451(LA 7836) solved everything. Don't ask why
it
> affected the video, but it did. Just a thought!
>
> Dan Webster
> Webster's TV
> Shullsburg, Wi.
> ----- Original Message -----
> From: "Paul Westcott" <westcott@xxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Wednesday, July 16, 2003 3:15 PM
> Subject: [TechAssist] Panasonic CT31XF32CT chassis ALEDP240C
>
>
> > Techs,
> > No paper on this beast.
> > Pic is dark,when the screen is slightly increased,
> > the video appears negative.
> > Is there a procedure to bypass the PIP module
> > to eliminate it?
> > I,ve replaced the jungle I.C. to no avail.
> > Better still, has anyone ran across this fault before.
> > Thanks in advance.
> > Paul Westcott
> > Kingsway Electronics
> > 1090 kingsway
> > Sudbury,Ontario
> > Canada
> > Phone 705 566-9290
> > Fax 705 566-5349
> >
>
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