[TechAssist] Re: RCA TV F35670MB, CTC187CN3, Lines in Pix

From: HSWAD@xxxxxxx
To: techassist@xxxxxxxxxxxxx
Date: Fri, 24 Jan 2003 11:41:24 EST
It is very obvious that you are a professional. Much success, Hollis Bates    
                                      In a message dated 1/24/03 11:09:13 AM 
Eastern Standard Time, ampm@xxxxxxx writes:


> Subj:[TechAssist] Re: RCA TV F35670MB, CTC187CN3, Lines in Pix 
> Date:1/24/03 11:09:13 AM Eastern Standard Time
> From:<A HREF="mailto:ampm@xxxxxxx";>ampm@xxxxxxx</A>
> Reply-to:<A 
> HREF="mailto:techassist@xxxxxxxxxxxxx";>techassist@xxxxxxxxxxxxx</A>
> To:<A HREF="mailto:techassist@xxxxxxxxxxxxx";>techassist@xxxxxxxxxxxxx</A>
> Sent from the Internet 
> 
> 
> 
> 
> You know Hollis, when I first started there was this guy at the service
> center that taught me the very same rule. I was checking everything with my
> multimeter and pulling my hair out and he walked over said let's hook the
> scope up and there was the problem on the scope. Since then I use the scope
> for all measurements to see trash on the lines ect.
> al marquardt
> ampm@xxxxxxx
> 
> 
> ----- Original Message -----
> From: <HSWAD@xxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Friday, January 24, 2003 8:38 AM
> Subject: [TechAssist] Re: RCA TV F35670MB, CTC187CN3, Lines in Pix
> 
> 
> > Like I have been saying right along-the scope is the ideal way to
> > troubleshoot-the shotgun is not. But of course I am from a past era.
> Hollis
> > Bates
> >          In a message dated 1/23/03 7:22:36 PM Eastern Standard Time,
> > gulftech@xxxxxxxx writes:
> >
> >
> > > Subj:[TechAssist] RCA TV F35670MB, CTC187CN3, Lines in Pix
> > > Date:1/23/03 7:22:36 PM Eastern Standard Time
> > > From:<A HREF="mailto:gulftech@xxxxxxxx";>gulftech@xxxxxxxx</A>
> > > Reply-to:HREF="mailto:techassist@xxxxxxxxxxxxx";>
> techassist@xxxxxxxxxxxxx
> > > To:HREF="mailto:techassist@xxxxxxxxxxxxx";>techassist@xxxxxxxxxxxxx
> > > Sent from the Internet
> > >
> > >
> > >
> > >
> > > Techs,
> > >
> > > I hope and pray someone has seen this and can help.  The set runs great
> > > for about 5-7 minutes.  Then, a 3-inch band appears on the lower third
> of
> > > the crt.  In this band, the video is distorted by horizontal lines,
> > > almost like firing lines one would see with a flyback arcing except it
> is
> > > confined to only that one area.  Almost like a UPC code superimposed on
> > > the pix, but turned sideways.
> > >
> > > Here is what has been tried.  Please don't laugh too hard.  My tech has
> > > spent two days on this one.  Does not respond to cold spray.
> > >     Tuner ground plane repaired and double-checked.
> > >     Replaced flyback, T4401
> > >     Replaced U1001, LA7610
> > >     Replaced horizontal drive transformer, T4301
> > >     Replaced Vertical output U4501
> > >     Replaced regulator U4101
> > >     Replaced high-ESR cap C4705.
> > >     Replaced C4402, C4407, CR4402, CR4403
> > > Hold on for the fix!!!
> > >
> > > Sorry for this long post, but stay with me for the happy ending.  While
> I
> > > was writing this, I had Tom scope the vertical signal.  The trash was
> > > evident in the signal.  He changed resistor pack R4511 and ceramic caps
> > > C4102 & C4504, both .22ufd.  One of those three fixed it.
> > >
> > > There is a point to this long thing.  When I saw the symptom, I knew it
> > > was a first for me.  I told my tech to start with the TGP and go to the
> > > vertical circuit.  He was lost and started guessing--replacing parts.
> > > When he ran out of parts (guesses), he asked for my help.  I agreed to
> > > write this only if he break out the scope.  Thirty minutes later, the
> set
> > > is working.  We have all been guilty of this--a time or two at least!
> > >
> > > HTH,
> > >
> > >
> > > Ken Smith
> > > Gulf Technical Services
> > > 3034 Gulf Breeze Parkway
> > > Gulf Breeze, FL  32563
> > > 850-934-8324 (Voice) 850-932-0819 (Fax)
> > >
> > >
> > >
> > >
> > >
> > >
> > >
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[TechAssist] Re: RCA TV F35670MB, CTC187CN3, Lines in Pix

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