[TechAssist] Re: RCA model # F32683SB, CTC197CE2,dead, relay clicks.

  • From: "J Silverman" <greentron@xxxxxxxxxxxxxxxx>
  • To: <techassist@xxxxxxxxxxxxx>
  • Date: Mon, 27 Jan 2003 20:35:01 -0500

My old Diehl MKV Scanner actually runs the FBT from its own bulletproof HOT
if there is B+ and lights tell me if there are problems. Then I can
disconnect the loads one at a time and if there is still a problem it has to
be the FBT. After the thing is fixed, the Diehl will run the tv indefinitely
to see if there are any intermittant problems. I still see those things
being offered for sale.
Jerry Silverman
Greentron Inc
4 Newland Ave
Greenville SC 29609
864 232 3889
Fax 271 2080
mailto:greentron@xxxxxxx
----- Original Message -----
From: "Wayne Vanaman" <Wayne@xxxxxxxxxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Monday, January 27, 2003 6:05 PM
Subject: [TechAssist] Re: RCA model # F32683SB, CTC197CE2,dead, relay
clicks.


>
> Excellent point Leonard.  An active test is better than a passive test.
In
> the CTC19x series I have seen many IHVTs that just don't break down untill
> you pass a couple hundred volt peaks.  If you have an external power
supply,
> say 30v + and a drive signal you are good to go.  The Sencore built it
stuff
> only goes up to about 15vdc and that is not enough to break down the
> transformer.
>
> I have a digital storage o'scope so it is easier for me to see the ringing
> on an IHVT however here is how to do it with an analog scope.
>
> 1.  Set the scope on "Normal Trigger"--not automatic, which most techs
use.
> 2.  Set the scope on about 20 uS.
> 3.  Set the scope to trigger on about 200v. (if you are on the collector
of
> the output transistor)
>     a.  If you can not scope the HOT collector directly use a secondary,
> such as the 200v supply
>     b.  set the scope to trigger on about 15-20% of the peak pulse you
would
> expect there.
> 4.  Turn the intensity of the trace up.
> 5.  Hit the power button while watching the scope.
>
> What you will see if the IHVT is bad is a series of pulses decaying in
> amplitude.
>
> Wayne Vanaman
> Omega Electronics
> 6904 W Fairfield Dr
> Pensacola, Fl.  32506-3310
>
> Wayne@xxxxxxxxxxxxxxxxxxxxx
> WWW.PensacolaTVRepair.Com
>
> 850-456-5995 voice
> 850-458-6369 fax
>
>
> ----- Original Message -----
> From: "Leonard G. Caillouet" <lcaillo@xxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Monday, January 27, 2003 4:47 PM
> Subject: [TechAssist] Re: RCA model # F32683SB, CTC197CE2,dead, relay
> clicks.
>
>
> >
> > Some flybacks will ring good with these tests and still be bad.  The
best
> > test that I have found is the Sencore drive test on the TVA92 which is
> just
> > a 25v horizontal key pulse applied to the primary. You measure the dc
> output
> > on the anode lead and compare to the chart.  It is very effective at
> > identifying HV rectifier problems that ringing will not.
> >
> > Leonard G. Caillouet
> > Service Manager
> > Electronics World
> > Gainesville, FL
> > 352-332-5608
> > 352-332-5668 (fax)
> >
> >
> > ----- Original Message -----
> > From: "Wayne Vanaman" <Wayne@xxxxxxxxxxxxxxxxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Monday, January 27, 2003 4:32 PM
> > Subject: [TechAssist] Re: RCA model # F32683SB, CTC197CE2,dead, relay
> > clicks.
> >
> >
> > >
> > > The ringing test is only that, a test.  The information is neither
good
> > nor
> > > bad by itself.  A good/bad test means nothing.  The Sencore VG91,
> HA2500,
> > > and LC102 will all tell you that the IHVT is good because they have
> > > arbitrarily selected 12 or something as the good/bad cut off.  You
need
> to
> > > know what the "new" or "good" ihvts measure.
> > >
> > > The best test for these is to see them ring would you hit the power
> > button.
> > >
> > > Here are some readings I recorded:
> > >
> > >
> > >
> > > IHVT 237506 2 good units measured.
> > > Pins 2-3 ring 57, 54 on the z-meter. Measures 2.77, 2.85 mH
> > > Pins 1-2 ring 29, 25 and measures 1.49, 1.43 uH
> > > Pins 1-3 ring 57, 54 and measures 2.52, 2.64 mH
> > > Pins 6-10 ring 48, 41 and measures 530, 540 uH
> > > On the TVA
> > > Pins 1-3 ring 30, 31
> > > Pins 1-2 ring 14, 16
> > > Pins 2-3 ring 30, 32
> > > Pins 6-10 ring 36, 36
> > >
> > > Pin 5-anode leaks 2 mA
> > >
> > > BAD UNITs z-meter
> > > pins 2-3 ring 19, 40
> > > pins 1-2 ring 2, 17
> > > pins 1-3 ring 18, 39
> > > pins 6-10 ring 7, 30
> > > On the TVA
> > > Pins 2-3 ring 15, 27
> > > Pins 1-2 ring 0, 11
> > > Pins 1-3 ring 14, 26
> > > Pins 6-10 ring 0, 26
> > >
> > >
> > > Notice the relatively high (good) ring count on the defective units.
> > >
> > >
> > >
> > >
> > > Wayne Vanaman
> > > Omega Electronics
> > > 6904 W Fairfield Dr
> > > Pensacola, Fl.  32506-3310
> > >
> > > Wayne@xxxxxxxxxxxxxxxxxxxxx
> > > WWW.PensacolaTVRepair.Com
> > >
> > > 850-456-5995 voice
> > > 850-458-6369 fax
> > >
> > >
> > > ----- Original Message -----
> > > From: "Kevin" <kevintv@xxxxxxx>
> > > To: <techassist@xxxxxxxxxxxxx>
> > > Sent: Monday, January 27, 2003 3:05 PM
> > > Subject: [TechAssist] Re: RCA model # F32683SB, CTC197CE2,dead, relay
> > > clicks.
> > >
> > >
> > > >
> > > > Which pins do I use to ring the flyback?  I have the schematic but I
> > > > can't find pin 14 on the flyback.  Pins 2 and 3, and 1 and 3 rang
> good.
> > > > Pins 1 and 2 rang bad.
> > > >
> > > > Kevin Wilks
> > > > Kevin's TV & Video Repair
> > > > Penticton BC Canada
> > > > kevintv@xxxxxxx
> > > >
> > > > -----Original Message-----
> > > > From: techassist-bounce@xxxxxxxxxxxxx
> > > > [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Jim Myers
> > > > Sent: Monday, January 27, 2003 4:22 AM
> > > > To: techassist@xxxxxxxxxxxxx
> > > > Subject: [TechAssist] Re: RCA model # F32683SB, CTC197CE2,dead,
relay
> > > > clicks.
> > > >
> > > >
> > > > Bad flyback, pull it and ring test it to be sure.
> > > > ----- Original Message -----
> > > > From: "Kevin" <kevintv@xxxxxxx>
> > > > To: "TECH-ASSIST" <techassist@xxxxxxxxxxxxx>
> > > > Sent: Monday, January 27, 2003 4:08 AM
> > > > Subject: [TechAssist] RCA model # F32683SB, CTC197CE2,dead, relay
> > > > clicks.
> > > >
> > > >
> > > > Hi fellow techs,
> > > >
> > > > Working on this 32" RCA.  When the pwr switch is pressed the just
> > > > clicks-no HV or sound.  Only brought in chassis-nojig either.  Any
> ideas
> > > > what could be wrong?  I have never seen this chassis before so any
> help
> > > > would be appreciated.  TIA
> > > >
> > > > Kevin Wilks
> > > > Kevin's TV & Video Repair
> > > > Penticton BC Canada
> > > > kevintv@xxxxxxx
> > > >
> > > >
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