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

  • From: "J Silverman" <greentron@xxxxxxx>
  • To: <techassist@xxxxxxxxxxxxx>
  • Date: Sat, 23 Jul 2005 14:28:31 -0400

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
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