[TechAssist] Re: Hitachi 60sx1k -AP 14 chassis. Big Pix Bending, poor sync
- From: <damon101@xxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Fri, 12 Oct 2001 08:33:36 -0500
Well it actually is a 60sx1k....I found out the 3D comb circuitry is
creating the distortion. I've pulled the module and will order the aluminum
caps which several people have suggested to do. Thanks for the info.
Now all I have to figure out is why the same TV goes into High voltage
shutdown, killing the Smps supplies, until I unplug the AC cord and plug it
back in. I had a terrible time scoping this unit because some of the plugs
would partially unplug themselves, causing no pix, no tuning, no power
problems.....I spent more time chasing partial unplugs than actually
diagnosing the comb filter. Note that all the regs, horiz output circuit and
smps were soldered. Acts up when the board is moved, so I'm looking for a
loose connect.
Damon Brunger
damon101@xxxxxxxxxxxxxx
Telrad Electronic Services
Ft Wayne, IN 46815
> ----- Original Message -----
> From: "TechAssist Admin." <techassist@xxxxxxxxxxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Wednesday, October 10, 2001 11:59 AM
> Subject: [TechAssist] Re: Hitachi 60sx1k -AP 14 chassis. Big Pix Bending,
> poor sync
>
>
> >
> > Damon, is this a 60SX11K? If so, I have the manuals if you
> > need them. I have no tips on this problem.
> > -Clint
> >
> > God Bless Us All
> > (PLEASE include previous correspondence
> > if replying to this email!!)
> >
> > ----- Original Message -----
> > From: <damon101@xxxxxxxxxxxxxx>
> > To: "TechAssist" <techassist@xxxxxxxxxxxxx>
> > Sent: Tuesday, October 09, 2001 8:24 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.
>
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