[TechAssist] Re: Zenith SY3581DT modules 9-1675-01, 9-1672-01 int vid & osd

I had seen this tip from the Tech Repair CD but it did not make any sense
for this set.  Apparently the chassis is different enough that the parts are
not the same.  These two resistors are not in series and are both 1K in this
chassis.  I'm not sure about what was meant by the sub, whether it is a
factory recommended mod or just a kludge to get close to the right values.
I would assume the latter.

Leonard G. Caillouet
Electronics World
Gainesville, FL
352-332-5608
352-332-5668 (fax)




----- Original Message -----
From: "Intrepid Video Support" <support@xxxxxxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, June 27, 2003 6:37 PM
Subject: [TechAssist] Re: Zenith SY3581DT modules 9-1675-01, 9-1672-01 int
vid & osd


> Leonard,
> From your Tech Repair CD:
> ZENITH\9-1674\Video* Int* Or None; OSD Intermittent\\\9-1674\Remove Series
Connected R3243 & R3244 82k &
> 110k 1/2w* (Changed Value And Install Two 68k And One 56k 1/2w'S\\\\\\\\
>
> Jeff Dougherty
> Intrepid Video TV/VCR
> 263 S Front St
> Steelton PA 17113
> fax...717-564-4952
> www.intrepid-video.com www.tech-repair.net
>
> ----- 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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