[TechAssist] Re: RCA F31672ET - CTC187CJ - Squeals on plug-in
- From: "al m" <ampm@xxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Sat, 8 May 2004 08:58:25 -0400
I just tested a CTC197 flyback and it rang 15 times, good right? Wrong the
new one rang 43 times. Not always 100%.
Al Marquardt
ampm@xxxxxxx
Al Marquardt Electronic Repair
206 W Main
Girardville Pa. 17935
----- Original Message -----
From: "Bruce Tiedeman" <btied@xxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Saturday, May 08, 2004 7:38 AM
Subject: [TechAssist] Re: RCA F31672ET - CTC187CJ - Squeals on plug-in
> David, I am working on the same chassis now. I removed the flyback to test
> properly with a ringer test. It tested good. When the plastic laminate of
> the flyback breaks down most of the time the ringer check will test OK.. I
> put a new output transistor in and when the set tried to start their was
> arcing from the top of flyback between core and H.V lead like Tony says.
> Quality of these small flybacks is poor and they try to drive these bigger
> picture tubes with a little unit does not work for long.
> My point is , even if you could test the flyback it might test good but in
> fact be the problem. They go for $67 at Global . I wanted to order one
from
> the U.S but by the time you pay delivery and brokerage would be almost
that
> price.
> good luck,
> Bruce.
>
> B&T Electronics
> 139 Margaret St
> Sarnia Ontario
> Canada
> N7T 2Y3
> 519 344 1850
>
> ----- Original Message -----
> From: "David Lessard" <mr_fixit@xxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Friday, May 07, 2004 6:55 AM
> Subject: [TechAssist] Re: RCA F31672ET - CTC187CJ - Squeals on plug-in
>
>
> > SMPS is working just fine, +B is 145VDC in standby. Replaced HOT, turned
> > TV "ON" and heard two snaps then the HOT blew again. Could this snapping
> > sound be an arcing flyback? Problem is test this problem, I really can't
> > adjust the +B because it's a SMPS. If I could limit the +B I could then
> > monitor the current, shutting down the +B before the HOT blows. Is there
> > any other way to check if the flyback is bad, I don't have REAL flyback
> > ringer, just my oscillator and scope.
> >
> > David Lessard
> > Alexandria Electronics
> > mr_fixit@xxxxxxxxxxxx
> >
> > -----Original Message-----
> > From: techassist-bounce@xxxxxxxxxxxxx
> > [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of tvservice
> > Sent: Friday, May 07, 2004 2:54 PM
> > To: techassist@xxxxxxxxxxxxx
> > Subject: [TechAssist] Re: RCA F31672ET - CTC187CJ - Squeals on plug-in
> >
> > CR4106 #243636 diode
> > U4101 STK730-030 #223948 reg ic
> > Should I also come over and take the back off for you?
> > :>) he he
> > hth
> > Robert
> > tvservice@xxxxxxxxxxxxx
> > H & H Electronics Inc
> >
> >
> > ----- Original Message -----
> > From: "David Lessard" <mr_fixit@xxxxxxxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Thursday, May 06, 2004 1:08 PM
> > Subject: [TechAssist] RCA F31672ET - CTC187CJ - Squeals on plug-in
> >
> >
> > > This TV squeals upon plug-in. I know there's a short somewhere causing
> > > the chopper PS to squeal, question is where? Does anyone know what the
> > > common causes for this problem are? I don't have the TV on the bench
> > yet
> > > and I'm asking this question in advance.
> > >
> > >
> > > Thanks in advance.
> > >
> > >
> > >
> > > David Lessard
> > >
> > > Alexandria Electronics
> > >
> > > 50 Harrison Street
> > >
> > > P.O. Box 1366
> > >
> > > Alexandria, Ontario.
> > >
> > > Canada
> > >
> > > K0C-1A0
> > >
> > > mr_fixit@xxxxxxxxxxxx
> > >
> > >
> > >
> > >
> > >
> > >
> > >
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