[TechAssist] Re: FIX: Symphonic13" TVCR combi, has "snivits" interference thru pix, even in AUX.
- From: "J Silverman" <greentron@xxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Mon, 16 Sep 2002 06:41:29 -0400
That was good work! Problem is that without a circuit diagram you can pass
over some bad caps testing with an esr meter in-circuit. To be sure you have
to desolder at least one cap lead before testing. With a diagram, you can
see which caps dont have coils or additional caps connected that can fool
the esr meter. Then only the other ones need to be desoldered to test.
If the unit will power up at all I find it a little faster to look at the
caps under power with a scope. Lots of hash means a high esr cap. Most
things have only one electrolytic causing the major symptom. Replacing more
of them could be considered preventative maintenance.
Jerry Silverman
Greentron Inc
4 Newland Ave
Greenville SC 29609
864 232 3889
Fax 271 2080
mailto:greentron@xxxxxxx
----- Original Message -----
From: "Kevin" <kevinstv@xxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Monday, September 16, 2002 2:55 PM
Subject: [TechAssist] Re: FIX: Symphonic13" TVCR combi, has "snivits"
interference thru pix, even in AUX.
>
> The first cap, 470uF was not borderline. ESR of 14 ohms was extremely
high!
> Second cap, .22uF was low in value, ESR is fine. As a rule of thumb, as I
> check a number of caps in a circuit, if the ESR is over one ohm I check
the
> value of the cap to see if it is a large value cap. Of course, as the
value
> of the cap increases the allowable ESR decreases. Just my two cents
worth.
> 3 cents if your American.
>
> Kevin Wilks
> Kevin's TV and Video Repair
> Penticton BC Canada
> kevinstv@xxxxxxx
> ----- Original Message -----
> From: Don Hartigan <hartstv@xxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Monday, September 16, 2002 11:08 AM
> Subject: [TechAssist] Re: FIX: Symphonic13" TVCR combi, has "snivits"
> interference thru pix, even in AUX.
>
>
> >
> > Phil,What is the Model & or Chass# for this unit.Would like it for my
data
> > base..TIA..Don
> > HARTS-TVCR''ASC''
> > 9 Robert St.,Oromocto,NewBrunswick,Can
> > E2V 3N2
> > Tel#506-357-9785,Fax#506-357-6010
> > hartstv@xxxxxxxxxxx
> > ----- Original Message -----
> > From: "Phil Bader" <philbad@xxxxxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Monday, September 16, 2002 12:07 PM
> > Subject: [TechAssist] FIX: Symphonic 13" TVCR combi, has "snivits"
> > interference thru pix, even in AUX.
> >
> >
> > >
> > > Condition was present in "play", tuner, and "AUX" with no video
> > > connected.
> > > Cure turned out to be two borderline electrolytics in the power
supply:
> > > C624 (470/16V) measured 321mfd, ESR: 14 ohms.
> > > C608 (.22, thats point-two-two/50V) measured .1, ESR: 15 ohms.
> > > THIS IS WHERE AN ESR METER IS A MUST!!!
> > > Replaced both, all seems OK.
> > > This model has main board and power supply all one, with the
> > > horiz/flyback/vert seperate side mounted assy.
> > > Phil Bader
> > >
> > > Phil Bader wrote:
> > > >
> > > > Looks like interference lines ( and swirls)with an area of
> bending.All
> > > > superimposed over picture. Not bending or distorting it. Closest
thing
> > > > to it is medical diathermy interference bands.
> > > > I assume there may be a small electrolytic open allowing "hash" to
> enter
> > > > a signal circuit.
> > > > Any past histories on this model?
> > > > Phil Bader
> > > > --
> > > > Philip Bader
> > > > Jan Phyl TV Inc. (estab. 1976)
> > > > 3420 Recker Hwy. Winter Haven, Fl. 33880
> > > > Fax (863) 299-8821
> > > > email: philbad@xxxxxxxxxx
> > > >
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> > > --
> > > Philip Bader
> > > Jan Phyl TV Inc. (estab. 1976)
> > > 3420 Recker Hwy. Winter Haven, Fl. 33880
> > > Fax (863) 299-8821
> > > email: philbad@xxxxxxxxxx
> > >
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