[TechAssist] Re: Sanyo DS31580--Looks like open filter
- From: "Tri-County Tv" <tricountytv@xxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Mon, 9 Jun 2003 20:39:52 -0400
Phil,
You were right, bad STR30130, replaced with OEM , works fine. Thanks
Tom Berger
Tri-County TV
Robbinsville
North Carolina 28771
(tricountytv@xxxxxxxxxxxxx)
----- Original Message -----
From: "Philip Bader" <tjanphyl@xxxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Thursday, May 29, 2003 11:37 AM
Subject: [TechAssist] Re: Sanyo DS31580--Looks like open filter
> I would replace the STR30130 without thinking.They do get noisey and are
> inexpensive. Sounds like the two bands indicate a 120 Hz interference-
> Thats the 60Hz line freq times-two (full-wave rectified).Also diodes in
> the PS can have noisey junctions but work.Replace the bridge diodes and
> STRxxx for starters.
> Now the vertical is 60Hz so I don't think you need to go there.
> Phil Bader
>
> Tri-County Tv wrote:
> >
> > Hello fellow techs,
> > Customer complains of white band across the
picture, got it on the bench and seems to work fine except for 2 small lines
moving up the screen, these lines are about as thin as 1 scan line and are
separated by 2/3 of the screen. If we unplug the set from the isolation
transformer and plug it into a non isolated outlet, the picture becomes very
distorted with 2 large wide bands of distorted picture move up the screen
and sound has a load hum, looks like open filter. I replaced main filter cap
and few others that were marginal, replaced tuner isolation box, checked the
ps diodes for leakage, maybe one of the ps diodes is leaking under load?
What gets me is the fact that the isolation transformer makes it almost go
away, so I am thinking some sort of grounding issue. It uses a STR30130
regulator and if you very the voltage to the set picture is rock steady. I
do not have a schematic and sams does not cross, help, I am Stumped.
> > Tom Berger
> > Tri-County TV
> > Robbinsville
> > North Carolina 28771
> > (tricountytv@xxxxxxxxxxxxx)
> >
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> --
> Philip Bader
> Jan Phyl TV Inc. (estab. 1976)
> 3420 Recker Hwy. Winter Haven, Fl. 33880
> Fax (863) 299-8821
> email: tjanphyl@xxxxxxxxxxxxxxx
>
>
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