[TechAssist] Re: Hitachi 60sx1k -AP 14 chassis. Big Pix Bending, poor sync
- From: <damon101@xxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 11 Oct 2001 19:54:47 -0500
Thanks Tom, you were right. Somebody mentioned a Capacitor Kit used to
repair the comb filter. Any part #'s or cap numbers would help, there's a
kajillion caps in there.
Thanks,
Damon Brunger
damon101@xxxxxxxxxxxxxx
Telrad Electronic Services
Ft Wayne, IN 46815
----- Original Message -----
From: "hermantv" <hermantv@xxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Tuesday, October 09, 2001 11:41 AM
Subject: [TechAssist] Re: Hitachi 60sx1k -AP 14 chassis. Big Pix Bending,
poor sync
>
> Leave the PiP alone...repair the Comb filter.
> Tommy Herman...Herman TV
>
> ----- Original Message -----
> From: <damon101@xxxxxxxxxxxxxx>
> To: "TechAssist" <techassist@xxxxxxxxxxxxx>
> Sent: Tuesday, October 09, 2001 9:24 AM
> Subject: [TechAssist] Hitachi 60sx1k -AP 14 chassis. Big Pix Bending, poor
> sync
>
>
> > Hello everyone,
> >
> > Recently worked on a Hitachi PTV ap14 chassis with darker than normal
> picture, no or erratic vertical sync and horizontal bending only at the
> bottom 1/3 or top 1/3 (not at the same time).
> >
> > I tested the sync signal at the vertical output and horiz drive using
the
> NTSC generator and found that they were locked to the generator. Also
tested
> the power supply and found about 2 volts of ripple on C952, C957 & C958.
> Gonna replace those caps...
> >
> > I checked the PIP and here is my concern: The small Picture is not
present
> using video 2 (Pip's main source is only Video 2) and is replaced by a
green
> field. Video 2 is present on big picture so the failure point must be in
the
> PIP. The customer doesn't care to have the PIP replaced unless it fixes
his
> scrambled Big Picture. Has anybody seen the Big Picture lose sync in the
> Pip? Yet the horiz/vert outputs are locked to the sync. Slightly weird set
> of symptoms, I would have guessed bad sync at the outputs and looked at
> power supply, or the video jungle IC for starters. Any help would be
> appreciated, I only get 2 or 3 Hitachi units a year.
> >
> > Thanks in advance,
> > Damon Brunger
> > damon101@xxxxxxxxxxxxxx
> > Telrad Electronic Services
> > Ft Wayne, IN 46815
> >
> > Help make your TechAssist online repair tips
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> >
>
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>
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