[TechAssist] Re: CTC169 vertical
- From: Gary McCartney <gary@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Tue, 23 Dec 2003 12:06:58 -0500
So when this happens, has anyone added a separate 26 V dc power supply
to power the vertical without having to replace the flyback? How about
winding wire around the flyback core to make up a supply for the
vertical?
Just wondering for future reference.
Gary McCartney
McCartney Electronics
Guelph Ontario Canada
Est. 1984
email: gary (at) number63.ca
D Trippel wrote:
>
> I agree. I have a ctc169js6 on my bench right now that will run for days, then
> vertical will collapse. open winding between pins 2 and 3 on flyback.
> Don Trippel
> Don's Electronics
> Rosthern Sask
> Canada
>
> "Terry H." wrote:
>
> > Peter, I've had it twice. Had an open winding for pins 2 and 3 of the fly
> > which feed the vertical circuit, pin 3 thru the horiz. drive transformer. I
> > think pin 2 should have 300vpp and pin 3 125vpp. Not that common but could
> > have an intermittent on that winding.
> > Terry H.
> > The TV Shop
> > Gonzales, Tx
> >
> > ----- Original Message -----
> > From: <tvservice@xxxxxxxxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Tuesday, December 23, 2003 8:45 AM
> > Subject: [TechAssist] Re: CTC169 vertical
> >
> > > Never replaced flyback on 169 for vertical
> > > have seen 2 small caps give intermittent vertical collapse or compressed
> > > change C4518 and C4519 both .33mfd polyester caps in series at base Q4506.
> > > Also had cracked surface mount cap once C4521 8200pf at U4501 pin 3.
> > > hth
> > > Robert
> > > tvservice@xxxxxxxxxxxxx
> > > H & H Electronics Inc
> > > Dallas, TX
> > >
> > >
> > > ----- Original Message -----
> > > From: "Peter oliver" <oliver_peter1@xxxxxxxxxxx>
> > > To: <techassist@xxxxxxxxxxxxx>
> > > Sent: Monday, December 22, 2003 11:15 PM
> > > Subject: [TechAssist] CTC169 vertical
> > >
> > >
> > > >
> > > >
> > > > Have several CTC169 sets with intermittant vertical problems,
> > > > (intermittant fluttering/colapse) Have checked the capactiors and
> > > > connections following schematic no effect get worse when warm- tap
> > > sensitive
> > > > in generalized way. Can desensitize (at least as a temporay test
> > measure)
> > > by
> > > > placing shims under board to deflect board upward. since hese sets use a
> > > > moldulated flyback drive to run the vertilcal. I have seen several tips
> > on
> > > > vertical problems to replace the flyback. Any one have any historys on
> > how
> > > > often it is necessary to replace the flyback in ctc 169's to cure a
> > > vertical
> > > > problem...
> > > >
> > > > Peter Oliver
> > > > Tucson Radio TV
> > > >
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