[TechAssist] Re: RCA D52W20, ITC222, Convergence power supply problem

  • From: "Tel-Tek Electronics" <teltek3@xxxxxxxxxxxx>
  • To: <techassist@xxxxxxxxxxxxx>
  • Date: Thu, 4 Aug 2005 13:40:36 -0400

OK..thanks Jerry. Just needed to ask.
Learning all the time. If you don't ask...you don't learn.

-Ed-
Tel-Tek Electronics
Ontario-Canada

teltek3@xxxxxxxxxxxx
----- Original Message -----
From: "J Silverman" <greentron@xxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Tuesday, July 26, 2005 12:02 PM
Subject: [TechAssist] Re: RCA D52W20, ITC222, Convergence power supply
problem


> Usually a LED that shines on a phototransistor, but if you look in a
catalog
> you will see a large combination of optodevices available in the same
> package, with photodiodes, photodarlingtons, photoscrs, phototriacs,
> photofets so its possible you might run into one of those someday.
> Jerry Silverman
> Greentron Inc
> 4 Newland Ave
> Greenville SC 29609
> Fax/Phone 864 232 3889
> mail to: greentron@xxxxxxx
> ----- Original Message -----
> From: "Tel-Tek Electronics" <teltek3@xxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Tuesday, July 26, 2005 10:38 AM
> Subject: [TechAssist] Re: RCA D52W20, ITC222, Convergence power supply
> problem
>
>
> > Are these Opto-Isolators pretty well interchangeable. I have one I
always
> > use for test purposes. As far as I can tell..it's an LED that shines on
an
> > IFR causing the Isolator to conduct. Right?
> >
> > -Ed-
> > Tel-Tek Electronics
> > Ontario-Canada
> >
> > teltek3@xxxxxxxxxxxx
> > ----- Original Message -----
> > From: <gulftech@xxxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Tuesday, July 26, 2005 10:07 AM
> > Subject: [TechAssist] Re: RCA D52W20, ITC222, Convergence power supply
> > problem
> >
> >
> > > Jerry,
> > >
> > > That is a truly outstanding suggestion.  I have often wondered how I
> > > could check an opto-isolator, but usually just replaced them if I had
> any
> > > doubts.  Bet I've replaced lots needlessly.
> > >
> > > May try to build a test jig with a socket, battery, limiting resistor,
> > > and posts for a meter.
> > >
> > > You have helped many techs with that suggestion.
> > >
> > > Thank you,
> > >
> > >
> > > Ken Smith
> > > Gulf Technical Services
> > > 3034 Gulf Breeze Parkway
> > > Gulf Breeze, FL  32563
> > > 850-934-8324 (Voice) 850-932-0819 (Fax)
> > >
> > >
> > > On Sat, 23 Jul 2005 14:28:31 -0400 "J Silverman" <greentron@xxxxxxx>
> > > writes:
> > > > That sound normal to me! If you put some current into pins 1 and 2,
> > > > say from
> > > > an ohm meter, then you should see some ohms appear at terminals 3
> > > > and 4, if
> > > > your meters have the right polarity.
> > > > Jerry Silverman
> > > > Greentron Inc
> > > > 4 Newland Ave
> > > > Greenville SC 29609
> > > > Fax/Phone 864 232 3889
> > > > mail to: greentron@xxxxxxx
> > > > ----- Original Message -----
> > > > From: <daryls_tv@xxxxxxx>
> > > > To: <techassist@xxxxxxxxxxxxx>
> > > > Sent: Saturday, July 23, 2005 1:20 AM
> > > > Subject: [TechAssist] Re: RCA D52W20, ITC222, Convergence power
> > > > supply
> > > > problem
> > > >
> > > >
> > > > > No... I don't have any schematics on this set.
> > > > > I think I may have found the problem.  I have absolutly no
> > > > resistance
> > > > readi=
> > > > > ngs between pins 3 & 4 of the opt-coupler, even on high meg scale.
> > > > > I will post the results when the part comes in.
> > > > > Thanks,
> > > > > Daryl
> > > > > Daryl's TV
> > > > > 2402 Wyoming Ave.
> > > > > El Paso, TX  79903
> > > > > 915-565-9184 Voice/Fax
> > > > > daryls_tv@xxxxxxx
> > > > > www.angelfire.com/tv2/daryls_tv
> > > > >
> > > > > ----- Original Message -----
> > > > > From: Damon <damoneb@xxxxxxxxxxx>
> > > > > To: techassist@xxxxxxxxxxxxx
> > > > > Subject: [TechAssist] Re: RCA D52W20, ITC222, Convergence power
> > > > supply
> > > > prob=
> > > > > lem
> > > > > Date: Fri, 22 Jul 2005 22:20:41 -0500
> > > > >
> > > > > >=20
> > > > > > Do you have schematics? If so, one of the transistors driving or
> > > > being
> > > > > > driven by the optoisolator can be jumpered (screwdriver) and
> > > > maybe the
> > > > un=
> > > > > it
> > > > > > will start, I'm pretty sure that if that's the case, replacement
> > > > of the
> > > > > > board will save you some time/money.
> > > > > >=20
> > > > > > Damon B
> > > > > > Telrad Electronics
> > > > > > Fort Wayne IN
> > > > > > ----- Original Message -----
> > > > > > From: <daryls_tv@xxxxxxx>
> > > > > > To: <techassist@xxxxxxxxxxxxx>
> > > > > > Sent: Friday, July 22, 2005 1:10 PM
> > > > > > Subject: [TechAssist] Re: RCA D52W20, ITC222, Convergence power
> > > > supply
> > > > > > problem
> > > > > >=20
> > > > > >=20
> > > > > > > After re-checking the power supply, I discovered that the
> > > > chopper is
> > > > not
> > > > > > os=3D
> > > > > > > cillating.  I guess I was in a hurry and used the wrong ground
> > > > as
> > > > > > reference.
> > > > > > > I rechecked every component on the primary side and still not
> > > > finding
> > > > > > anyth=3D
> > > > > > > ing bad.
> > > > > > > I thought I would sub another chopper into it but I couldn't
> > > > find any
> > > > > > cross=3D
> > > > > > >  for it.  I hate to order one and wait several days only find
> > > > out that
> > > > =
> > > > > may
> > > > > > =3D
> > > > > > > not be it.
> > > > > > > Daryl=3D20
> > > > > > > Daryl's TV
> > > > > > > 2402 Wyoming Ave.
> > > > > > > El Paso, TX  79903
> > > > > > > 915-565-9184 Voice/Fax
> > > > > > > daryls_tv@xxxxxxx
> > > > > > > www.angelfire.com/tv2/daryls_tv
> > > > > > >
> > > > > > >
> > > > > > > ----- Original Message -----
> > > > > > > From: Damon <damoneb@xxxxxxxxxxx>
> > > > > > > To: techassist@xxxxxxxxxxxxx
> > > > > > > Subject: [TechAssist] Re: RCA D52W20, ITC222, Convergence
> > > > power supply
> > > > > > prob=3D
> > > > > > > lem
> > > > > > > Date: Fri, 22 Jul 2005 08:00:20 -0500
> > > > > > >
> > > > > > > >=3D20
> > > > > > > > Daryl,
> > > > > > > > I have yet to see a defective convergence power supply on
> > > > the ITC
> > > > 222,
> > > > > > > > HOWEVER.....
> > > > > > > > The CTC 195/197 series has had intermittant conv power
> > > > shutdown, and
> > > > =
> > > > > the
> > > > > > > > board cost was cheap enough to just replace it entirely. It
> > > > might be
> > > > =
> > > > > the
> > > > > > =3D
> > > > > > > way
> > > > > > > > to go on this unit.
> > > > > > > >=3D20
> > > > > > > > On the boards I worked on, I was able to eventually see it
> > > > fail,
> > > > then=
> > > > >  by
> > > > > > > > jumpering  two leads on the primary side I was able to
> > > > restart it
> > > > and
> > > > > > ver=3D
> > > > > > > ify
> > > > > > > > it was the smps, and it was not a "shorting" type of
> > > > failure. The
> > > > > > oscilla=3D
> > > > > > > tor
> > > > > > > > just quits oscillating for no good reason. But in your case
> > > > oscillati=
> > > > > on
> > > > > > > > isn't the issue, tranferring power to the secondary
> > > > is......does the
> > > > > > final
> > > > > > > > output drive the transformer at all?
> > > > > > > >=3D20
> > > > > > > > Damon B
> > > > > > > > Telrad Electronics
> > > > > > > > Fort Wayne IN
> > > > > > > > ----- Original Message -----
> > > > > > > > From: <daryls_tv@xxxxxxx>
> > > > > > > > To: <TechAssist@xxxxxxxxxxxxx>
> > > > > > > > Sent: Thursday, July 21, 2005 6:18 PM
> > > > > > > > Subject: [TechAssist] RCA D52W20, ITC222, Convergence power
> > > > supply
> > > > > > problem
> > > > > > > >=3D20
> > > > > > > >=3D20
> > > > > > > > > RCA D52W20, ITC222, Convergence power supply problem
> > > > > > > > >
> > > > > > > > > Another looser here.
> > > > > > > > > Customer claims they changed channels and lost the
> > > > convergence.
> > > > > > > > > What I found is no control of convergence and a distorted
> > > > picture.
> > > > > > > > > There are no voltages out of the convergence power supply
> > > > on the
> > > > > > > > secondarie=3D3D
> > > > > > > > > s.
> > > > > > > > > I do have power on the primary of the smps and does appear
> > > > to be
> > > > > > > > oscillatin=3D3D
> > > > > > > > > g.
> > > > > > > > > I checked all of the semi's, resistors and electro's. I
> > > > ohmed out
> > > > t=
> > > > > he
> > > > > > > > switc=3D3D
> > > > > > > > > h mode power transformer. I didn't find any bad
> > > > components.
> > > > > > > > > I hope someone has encountered this before and can give a
> > > > few
> > > > > > pointers.
> > > > > > > > > Thanks,
> > > > > > > > > Daryl
> > > > > > > > > Daryl's TV
> > > > > > > > > 2402 Wyoming Ave.
> > > > > > > > > El Paso, TX  79903
> > > > > > > > > 915-565-9184 Voice/Fax
> > > > > > > > > daryls_tv@xxxxxxx
> > > > > > > > > www.angelfire.com/tv2/daryls_tv
> > > > > > > > >
> > > > > > > > >
> > > > > > > > >
> > > > > > > > > --=3D3D20
> > > > > > > > >
> > > > ___________________________________________________________
> > > > > > > > > Sign-up for Ads Free at Mail.com
> > > > > > > > > http://promo.mail.com/adsfreejump.htm
> > > > > > > > >
> > > > > > > >
> > > > > >
> > > > >
> > > >
> >
> -----------------------------------------------------------------------=
> > > > > =3D
> > > > > > > ---
> > > > > > > > ---
> > > > > > > > > This Email List is Public. Remove:
> > > > > > http://www.tech-assist.org/remove.htm
> > > > > > > > > Set Vacation
> > > > > > > >
> > > > mailto:ecartis@xxxxxxxxxxxxx?subject=3D3Dset%20techassist%20vacation
> > > > > > > > > Lost Password: http://www.tech-assist.org  and select
> > > > "Login
> > > > > > Problems?".
> > > > > > > > > Email Archives:
> > > > //www.freelists.org/archives/techassist/
> > > > > > > > >
> > > > > > > >=3D20
> > > > > > > >=3D20
> > > > > > >
> > > > > >
> > > > >
> > > >
> >
> -----------------------------------------------------------------------=
> > > > > --=3D
> > > > > > > ----
> > > > > > > > This Email List is Public. Remove:
> > > > http://www.tech-assist.org/remove.=
> > > > > htm
> > > > > > > > Set Vacation
> > > > > >
> > > > mailto:ecartis@xxxxxxxxxxxxx?subject=3D3Dset%20techassist%20va=3D
> > > > > > > cation
> > > > > > > > Lost Password: http://www.tech-assist.org  and select "Login
> > > > Problems=
> > > > > ?".
> > > > > > > > Email Archives:
> > > > //www.freelists.org/archives/techassist/
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > > --=3D20
> > > > > > > ___________________________________________________________
> > > > > > > Sign-up for Ads Free at Mail.com
> > > > > > > http://promo.mail.com/adsfreejump.htm
> > > > > > >
> > > > > >
> > > > >
> > > >
> >
> -----------------------------------------------------------------------=
> > > > > ---
> > > > > > ---
> > > > > > > This Email List is Public. Remove:
> > > > http://www.tech-assist.org/remove.htm
> > > > > > > Set Vacation
> > > > > >
> > > > mailto:ecartis@xxxxxxxxxxxxx?subject=3Dset%20techassist%20vacation
> > > > > > > Lost Password: http://www.tech-assist.org  and select "Login
> > > > Problems?".
> > > > > > > Email Archives: //www.freelists.org/archives/techassist/
> > > > > > >
> > > > > >=20
> > > > > >=20
> > > > >
> > > > >
> > > >
> >
>
> -------------------------------------------------------------------------
> > > =
> > > > > ----
> > > > > > This Email List is Public. Remove:
> > > > http://www.tech-assist.org/remove.htm
> > > > > > Set Vacation
> > > > mailto:ecartis@xxxxxxxxxxxxx?subject=3Dset%20techassist%20va=
> > > > > cation
> > > > > > Lost Password: http://www.tech-assist.org  and select "Login
> > > > Problems?".
> > > > > > Email Archives: //www.freelists.org/archives/techassist/
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > > --=20
> > > > > ___________________________________________________________
> > > > > Sign-up for Ads Free at Mail.com
> > > > > http://promo.mail.com/adsfreejump.htm
> > > > >
> > > > >
> > > >
> >
>
> -------------------------------------------------------------------------
> > > -
> > > > ---
> > > > > This Email List is Public. Remove:
> > > > http://www.tech-assist.org/remove.htm
> > > > > Set Vacation
> > > > mailto:ecartis@xxxxxxxxxxxxx?subject=set%20techassist%20vacation
> > > > > Lost Password: http://www.tech-assist.org  and select "Login
> > > > Problems?".
> > > > > Email Archives: //www.freelists.org/archives/techassist/
> > > >
> > > >
> >
>
> -------------------------------------------------------------------------
> > > ----
> > > > This Email List is Public. Remove:
> > > > http://www.tech-assist.org/remove.htm
> > > > Set Vacation
> > > > mailto:ecartis@xxxxxxxxxxxxx?subject=set%20techassist%20vacation
> > > > Lost Password: http://www.tech-assist.org  and select "Login
> > > > Problems?".
> > > > Email Archives: //www.freelists.org/archives/techassist/
> > > >
> > > >
> >
>
> --------------------------------------------------------------------------
> > ---
> > > This Email List is Public. Remove:
http://www.tech-assist.org/remove.htm
> > > Set Vacation
> > mailto:ecartis@xxxxxxxxxxxxx?subject=set%20techassist%20vacation
> > > Lost Password: http://www.tech-assist.org  and select "Login
Problems?".
> > > Email Archives: //www.freelists.org/archives/techassist/
> >
>
> --------------------------------------------------------------------------
> ---
> > This Email List is Public. Remove: http://www.tech-assist.org/remove.htm
> > Set Vacation
> mailto:ecartis@xxxxxxxxxxxxx?subject=set%20techassist%20vacation
> > Lost Password: http://www.tech-assist.org  and select "Login Problems?".
> > Email Archives: //www.freelists.org/archives/techassist/
>
> --------------------------------------------------------------------------
---
> This Email List is Public. Remove: http://www.tech-assist.org/remove.htm
> Set Vacation
mailto:ecartis@xxxxxxxxxxxxx?subject=set%20techassist%20vacation
> Lost Password: http://www.tech-assist.org  and select "Login Problems?".
> Email Archives: //www.freelists.org/archives/techassist/

-----------------------------------------------------------------------------
This Email List is Public. Remove: http://www.tech-assist.org/remove.htm
Set Vacation mailto:ecartis@xxxxxxxxxxxxx?subject=set%20techassist%20vacation
Lost Password: http://www.tech-assist.org  and select "Login Problems?".
Email Archives: //www.freelists.org/archives/techassist/

Other related posts:

  1. Home
  2. techassist
  3. Archive
  4. 08-2005