[TechAssist] Re: RCA F27201GG (CTC 169CAQS) VERT DEFLECTION?
- From: "Keith Trumbla" <keith@xxxxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 25 Mar 2004 17:03:23 -0600
I had something like that a while back. The PNP emitter follower was shorted
causing the video to be driven when it was actually supposed to be blanked,
causing you to be able to see vertical collapse during initial power up and
degauss.
I am sorry, I don't remember the location but it's your luma driver/buffer
HTH
Keith Trumbla
BEMelectronics.com
Suite 212-530 Century St.
Winnipeg Canada
R3H 0Y4
Ph.204.775.2875 Fax.204.774-9192
----- Original Message -----
From: "Ed Gaidies" <teltek3@xxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Thursday, March 25, 2004 3:36 PM
Subject: [TechAssist] Re: RCA F27201GG (CTC 169CAQS) VERT DEFLECTION?
> Pretty sure that's normal on those sets, vertical sweep is suppressed till
> degaussing has finished. Depending on your screen setting if and how much
> it's visible.
>
> -Ed-
>
>
>
> Tel-Tek Electronics
> Ontario-Canada
>
> teltek3@xxxxxxxxxxxx
> ----- Original Message -----
> From: "Bruce Tiedeman" <btied@xxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Thursday, March 25, 2004 2:01 PM
> Subject: [TechAssist] Re: RCA F27201GG (CTC 169CAQS) VERT DEFLECTION?
>
>
> > Al when the set is first turned on look at the screen and see if you see
a
> > faint vert (deflection) line about 1\4' high before the picture comes
in?
> > Did the customer send this back for this type of a problem? It does not
> > affect picture once it is on.
> >
> > Bruce.
> > ----- Original Message -----
> > From: "al m" <ampm@xxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Thursday, March 25, 2004 1:07 PM
> > Subject: [TechAssist] Re: RCA F27201GG (CTC 169CAQS) VERT DEFLECTION?
> >
> >
> > > I got the same problem here. I haven't seen the problem yet. Customer
> says
> > > it only happens when they turn it on. Original problem was picture was
> > > stretched and the line when turned on. Caps in the vertical section
> fixed
> > > that.
> > > Went over the regulator and changed CR4118 and the thing went out.
Came
> > back
> > > 2 weeks later with this line thing??????? I thought I had it fixed
when
> > the
> > > picture came up OK. Never have seen the line.
> > > Al Marquardt
> > > ampm@xxxxxxx
> > > Al Marquardt Electronic Repair
> > > 206 W Main
> > > Girardville Pa. 17935
> > > ----- Original Message -----
> > > From: "Wayne Vanaman" <Wayne@xxxxxxxxxxxxxxxxxxxxx>
> > > To: <techassist@xxxxxxxxxxxxx>
> > > Sent: Thursday, March 25, 2004 12:17 PM
> > > Subject: [TechAssist] Re: RCA F27201GG (CTC 169CAQS) VERT DEFLECTION?
> > >
> > >
> > > > Normal operation.
> > > > Vertical is blanked during degauss.
> > > > If this is a "problem" turn the main screen down a lttle.
> > > >
> > > > Wayne Vanaman
> > > > Omega Electronics
> > > > 6904 W Fairfield Dr
> > > > Pensacola, Fl. 32506-3310
> > > >
> > > > Wayne@xxxxxxxxxxxxxxxxxxxxx
> > > > WWW.PensacolaTVRepair.Com
> > > >
> > > > 850-456-5995 voice
> > > > 850-458-6369 fax
> > > >
> > > >
> > > > ----- Original Message -----
> > > > From: "Bruce Tiedeman" <btied@xxxxxxxxxxxx>
> > > > To: <techassist@xxxxxxxxxxxxx>
> > > > Sent: Thursday, March 25, 2004 10:17 AM
> > > > Subject: [TechAssist] RCA F27201GG (CTC 169CAQS) VERT DEFLECTION?
> > > >
> > > >
> > > > > "Momentary no vert deflection then OK". At start up.
> > > > > I hope some one can shed some light on this problem, At turn on
you
> > see
> > > a
> > > > > collapsed vert deflection (about 1\4" deflection) then I hear the
> > relay
> > > > > click an the set comes on full deflection as the CRT heaters
lights
> up
> > > the
> > > > > tube. The regulation is good around 143 volts similar in standby.
> > > > > I did change the cr4118, Q4402 and Q4202. Soldered all board
> > connections
> > > > in
> > > > > Vet circuit. Replaced C403K.
> > > > > I am starting to go around in circles on this set. Trying to
figure
> > out
> > > > the
> > > > > theory of operation. I am working off of a CTC169 print but has
> > > different
> > > > > parts than shown in data base. U4501 the vert drive switch shows a
> > drive
> > > > > pulse OK at turn on.
> > > > > . Sorry if my explanation is vague. I also changed the degaussing
> > switch
> > > > > transistor!
> > > > > As soon as I hit the tack switch the vert line shows up, then the
> > relay
> > > > > sounds and the picture comes in ?
> > > > > I don't want to send out this set as is. The original condition
was
> > > > > regulator problem which has been repaired , then I noticed this.
> > Should
> > > > not
> > > > > see any kind of visible deflection this soon at turn on?
> > > > >
> > > > > Bruce.
> > > > >
> > > > > B&T Electronics
> > > > > 139 Margaret St
> > > > > Sarnia Ontario
> > > > > Canada
> > > > > N7T 2Y3
> > > > > 519 344 1850
> > > > >
> > > > >
> > > > >
> > > >
> > >
> >
>
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