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

From: daryls_tv@xxxxxxx
To: techassist@xxxxxxxxxxxxx
Date: Sat, 23 Jul 2005 08:44:44 -0600
Damon,
Thanks for your efforts.
Besides going to have to learn to speak Chinese, it looks like we are going=
 have to learn to speak the Hindu language. :-)
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: Sat, 23 Jul 2005 06:31:40 -0500

>=20
> Daryl I'd offer you a copy of the power supply for that....BUT
> I just tried printing....1/2 of the schematic popped out
> 2 page printing.....2 white pages popped out.
> Copy and paste....that's magnify and move operations in the RCA schematic
> program.
>=20
> I know there's a software engineer over there named Simon Bar Sinister,
> Mouhaha-ing all the way to the bank after developing those print
> drivers.....sorry, can't help you with a SCHEMATIC.
> Maybe someone else??? (At least I'd know my program load was a bad load
> then....)
>=20
> Damon B
> Telrad Electronics
> Fort Wayne IN
> ----- Original Message -----
> From: <daryls_tv@xxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Saturday, July 23, 2005 12:20 AM
> Subject: [TechAssist] Re: RCA D52W20, ITC222, Convergence power supply
> problem
>=20
>=20
> > No... I don't have any schematics on this set.
> > I think I may have found the problem.  I have absolutly no resistance
> readi=3D
> > 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=3D
> > lem
> > Date: Fri, 22 Jul 2005 22:20:41 -0500
> >
> > >=3D20
> > > 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=3D
> > it
> > > will start, I'm pretty sure that if that's the case, replacement of t=
he
> > > board will save you some time/money.
> > >=3D20
> > > 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
> > >=3D20
> > >=3D20
> > > > After re-checking the power supply, I discovered that the chopper is
> not
> > > os=3D3D
> > > > 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=
ng
> > > anyth=3D3D
> > > > ing bad.
> > > > I thought I would sub another chopper into it but I couldn't find a=
ny
> > > cross=3D3D
> > > >  for it.  I hate to order one and wait several days only find out t=
hat
> =3D
> > may
> > > =3D3D
> > > > not be it.
> > > > Daryl=3D3D20
> > > > 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 08:00:20 -0500
> > > >
> > > > >=3D3D20
> > > > > 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
> =3D
> > the
> > > > > board cost was cheap enough to just replace it entirely. It might=
 be
> =3D
> > the
> > > =3D3D
> > > > way
> > > > > to go on this unit.
> > > > >=3D3D20
> > > > > On the boards I worked on, I was able to eventually see it fail,
> then=3D
> >  by
> > > > > jumpering  two leads on the primary side I was able to restart it
> and
> > > ver=3D3D
> > > > ify
> > > > > it was the smps, and it was not a "shorting" type of failure. The
> > > oscilla=3D3D
> > > > tor
> > > > > just quits oscillating for no good reason. But in your case
> oscillati=3D
> > on
> > > > > isn't the issue, tranferring power to the secondary is......does =
the
> > > final
> > > > > output drive the transformer at all?
> > > > >=3D3D20
> > > > > 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
> > > > >=3D3D20
> > > > >=3D3D20
> > > > > > 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=
re.
> > > > > > There are no voltages out of the convergence power supply on the
> > > > > secondarie=3D3D3D
> > > > > > s.
> > > > > > I do have power on the primary of the smps and does appear to be
> > > > > oscillatin=3D3D3D
> > > > > > g.
> > > > > > I checked all of the semi's, resistors and electro's. I ohmed o=
ut
> t=3D
> > he
> > > > > switc=3D3D3D
> > > > > > 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
> > > > > >
> > > > > >
> > > > > >
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>=20
>=20
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