[TechAssist] Re: fix Sanyo 19" TV, AVM1905 reg B+ 135V sags, unstable
- From: "George" <grndmstrg@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Fri, 6 Jun 2003 02:20:54 -0700
Phil,
Did you check the electrolytics in the regulator circuit? I usually find at
least one bad one in circuits using this IC.
George
Afana Electronics
Moreno Valley, CA
grndmstrg@xxxxxxxxxxxx
----- Original Message -----
From: "Philip Bader" <tjanphyl@xxxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Thursday, June 05, 2003 10:54 AM
Subject: [TechAssist] Re: fix Sanyo 19" TV, AVM1905 reg B+ 135V sags,
unstable
> The set seems stable now,but I notice the regulated output is a bit
> high, around +138.4 VDC at pin 4 output of the STR All the surrounding
> resistors seem to be OK.Is this normal for this chassis?
> I can now run the brightness and/or G2 up and down without variations I
> had before.
> Phil Bader
>
> Philip Bader wrote:
> >
> > It appears the STR30135 was the fix.Stable output now from the STR.Will
> > cook it in. I noticed the HOT has new solder and heat sink goo on it,
> > maybe another shop replaced the HOT,which stressed this regulator.
> > Thanks,all.
> > Phil Bader
> >
> > Philip Bader wrote:
> > >
> > > Comes on and plays OK until warm and picture fluctuated all sides as
> > > scene brightness changes.Customer said it "rolled" but it's the
> > > STR30135's regulated output fluctuating.Turn brightness down low and
> > > voltage increases closer to normal.Output is sagging under load.
> > > Looks like it's been worked on before, so:
> > > I need to verify these PS parts are correct:
> > > IC001 (STR30135?)
> > > R005 (220K ohm?)
> > > R006 (47 ohm?)
> > > R004 (10K?)
> > > R007 (5.6 ohm?)
> > > Tritronics' model parts look up is incomplete.
> > > Thanks.
> > > Phil Bader
> > > --
> > > 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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> > --
> > 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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> --
> 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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