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

From: daryls_tv@xxxxxxx
To: techassist@xxxxxxxxxxxxx
Date: Tue, 26 Jul 2005 08:36:19 -0600
Wow! Damon....
Where do you buy your parts?
I have not found anything for that price nor have I found anyone that has i=
t in stock.
Most are from $90 to $110 and I have to send it in with a 2 to 4 week turn =
around.
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: Tue, 26 Jul 2005 07:54:59 -0500

>=20
> Daryl,
> 264104 is $58.95 and $20 Dud.
> How many hours you got into that power supply?
>=20
> Damon B
> Telrad Electronics
> Fort Wayne IN
> ----- Original Message -----
> From: <daryls_tv@xxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Monday, July 25, 2005 12:19 PM
> Subject: [TechAssist] Re: RCA D52W20, ITC222, Convergence power supply
> problem
>=20
>=20
> > Jerry,
> > You are absolutely correct.
> > I used a second meter and I did get resistance.  Whether it is the right
> re=3D
> > adings.....????
> > Thanks for the tip.
> > 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: "J Silverman" <greentron@xxxxxxx>
> > To: techassist@xxxxxxxxxxxxx
> > Subject: [TechAssist] Re: RCA D52W20, ITC222, Convergence power supply
> prob=3D
> > lem
> > Date: Sat, 23 Jul 2005 14:28:31 -0400
> >
> > >=3D20
> > > That sound normal to me! If you put some current into pins 1 and 2, s=
ay
> f=3D
> > rom
> > > an ohm meter, then you should see some ohms appear at terminals 3 and=
 4,
> =3D
> > 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
> > >=3D20
> > >=3D20
> > > > No... I don't have any schematics on this set.
> > > > I think I may have found the problem.  I have absolutly no resistan=
ce
> > > readi=3D3D
> > > > 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 sup=
ply
> > > prob=3D3D
> > > > lem
> > > > Date: Fri, 22 Jul 2005 22:20:41 -0500
> > > >
> > > > >=3D3D20
> > > > > 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=3D3D
> > > > it
> > > > > will start, I'm pretty sure that if that's the case, replacement =
of
> t=3D
> > he
> > > > > board will save you some time/money.
> > > > >=3D3D20
> > > > > 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
> > > > >=3D3D20
> > > > >=3D3D20
> > > > > > After re-checking the power supply, I discovered that the chopp=
er
> is
> > > not
> > > > > os=3D3D3D
> > > > > > 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
> findi=3D
> > ng
> > > > > anyth=3D3D3D
> > > > > > ing bad.
> > > > > > I thought I would sub another chopper into it but I couldn't fi=
nd
> a=3D
> > ny
> > > > > cross=3D3D3D
> > > > > >  for it.  I hate to order one and wait several days only find o=
ut
> t=3D
> > hat
> > > =3D3D
> > > > may
> > > > > =3D3D3D
> > > > > > not be it.
> > > > > > Daryl=3D3D3D20
> > > > > > 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
> sup=3D
> > ply
> > > > > prob=3D3D3D
> > > > > > lem
> > > > > > Date: Fri, 22 Jul 2005 08:00:20 -0500
> > > > > >
> > > > > > >=3D3D3D20
> > > > > > > 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 shutdo=
wn,
> =3D
> > and
> > > =3D3D
> > > > the
> > > > > > > board cost was cheap enough to just replace it entirely. It
> might=3D
> >  be
> > > =3D3D
> > > > the
> > > > > =3D3D3D
> > > > > > way
> > > > > > > to go on this unit.
> > > > > > >=3D3D3D20
> > > > > > > On the boards I worked on, I was able to eventually see it fa=
il,
> > > then=3D3D
> > > >  by
> > > > > > > jumpering  two leads on the primary side I was able to restart
> it
> > > and
> > > > > ver=3D3D3D
> > > > > > ify
> > > > > > > it was the smps, and it was not a "shorting" type of failure.
> The
> > > > > oscilla=3D3D3D
> > > > > > tor
> > > > > > > just quits oscillating for no good reason. But in your case
> > > oscillati=3D3D
> > > > on
> > > > > > > isn't the issue, tranferring power to the secondary is......d=
oes
> =3D
> > the
> > > > > final
> > > > > > > output drive the transformer at all?
> > > > > > >=3D3D3D20
> > > > > > > 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
> > > > > > >=3D3D3D20
> > > > > > >=3D3D3D20
> > > > > > > > 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
> pictu=3D
> > re.
> > > > > > > > There are no voltages out of the convergence power supply on
> the
> > > > > > > secondarie=3D3D3D3D
> > > > > > > > s.
> > > > > > > > I do have power on the primary of the smps and does appear =
to
> be
> > > > > > > oscillatin=3D3D3D3D
> > > > > > > > g.
> > > > > > > > I checked all of the semi's, resistors and electro's. I ohm=
ed
> o=3D
> > ut
> > > t=3D3D
> > > > he
> > > > > > > switc=3D3D3D3D
> > > > > > > > h mode power transformer. I didn't find any bad components.
> > > > > > > > I hope someone has encountered this before and can give a f=
ew
> > > > > pointers.
> > > > > > > > Thanks,
> > > > > > > > Daryl
>=20
>=20
> -------------------------------------------------------------------------=
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--=20
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