[TechAssist] Re: Zenith SY3581DT modules 9-1675-01, 9-1672-01 int vid & osd
- From: "Bob@Bobs tv" <woodman1@xxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Fri, 27 Jun 2003 17:00:36 -0400
Leonard,
Closing time, I will pull manual in the morning...
Bobs TV Worcester, ma
woodman1@xxxxxxxx
Main 508-853-1482
Fax 508-853-1480
----- Original Message -----
From: "Leonard G. Caillouet" <lcaillo@xxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, June 27, 2003 4:33 PM
Subject: [TechAssist] Zenith SY3581DT modules 9-1675-01, 9-1672-01 int vid &
osd
> I'd like to know what signals from the sweep board go to the main board if
> someone has a manual.
>
> This one has intermittent video and OSD. It also has erratic color, looks
> like an AKB problem. All the usual suspects on the CRT board are OK and
the
> tube tests good. Can't tie it down to thermal or connection problems. I
> had sent the main board in to TSM for rebuild and it came back and does
the
> same thing. I thought that heating and cooling the micro module effected
> the problem, but it is hard to reproduce.
>
> Also, while I had the OSD up for a bit I was able to get into the service
> mode and attempted to adjust the white balance and found the green
> adjustments had no effect at all. This makes me suspect the VCJ or
related
> circuits, but I know that I don't have OSD out of the micro when it goes.
I
> must be missing something.
>
> One strange thing that I noticed is that sometimes adjusting the screen
> control affects the menu coming and going. When it comes and goes it
looks
> like the sync is corrupted and has ripples rolling through vertically.
> Sometimes disconnecting the antenna input will bring up the OSD, but
> unstable. Any info on the sync paths for the OSD, clock and data lines,
and
> insertion points on the VCJ would be appreciated also.
>
> I have already changed R3234, BTW, though it was fine.
>
> Thanks.
>
> Leonard G. Caillouet
> Electronics World
> Gainesville, FL
> 352-332-5608
> 352-332-5668 (fax)
>
>
>
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