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

  • From: "al m" <ampm@xxxxxxx>
  • To: <techassist@xxxxxxxxxxxxx>
  • Date: Fri, 24 Jan 2003 11:04:20 -0500

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:<A
HREF="mailto:techassist@xxxxxxxxxxxxx";>techassist@xxxxxxxxxxxxx</A>
> > To:<A
HREF="mailto:techassist@xxxxxxxxxxxxx";>techassist@xxxxxxxxxxxxx</A>
> > 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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