[TechAssist] Re: Fw: Zenith TV (SM2771S) NO video retrace lines bright screen !

  • From: "Bruce Tiedeman" <btied@xxxxxxxxxxxx>
  • To: <techassist@xxxxxxxxxxxxx>
  • Date: Fri, 15 Nov 2002 13:34:24 -0500

Yes Charles thanks for the reminder had one like that a while back. Will
change the transistor on the CRT board. It is a small signal type if I
recall.
My mind is going , memory is bad lately.

thanks
Bruce.

----- Original Message -----
From: "repair1" <repair1@xxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, November 15, 2002 1:25 PM
Subject: [TechAssist] Re: Fw: Zenith TV (SM2771S) NO video retrace lines
bright screen !


>
> I am sorry that I did not se all of your post header, If you have bright
> lines and no video, check collectors of video drivers on crt board, if v
> absent trace backwards and find supply, also there is a small transitor on
> crt board that will cause similar symptoms, hth.
>
> charles betzler
> Best Electronics
> repair1@xxxxxxxxxxxxx
>
>
>
> ----- Original Message -----
> From: "repair1" <repair1@xxxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Friday, November 15, 2002 10:31 AM
> Subject: [TechAssist] Re: Fw: Zenith TV (SM2771S) NO video retrace lines
> bright screen !
>
>
> >
> > If unit has comb filter look for bad connections,hth.
> >
> > charles betzler
> > Best Electronics
> > repair1@xxxxxxxxxxxxx
> >
> >
> > ----- Original Message -----
> > From: "Bruce Tiedeman" <btied@xxxxxxxxxxxx>
> > To: "Techassist@xxxxxxxxxxxxx" <techassist@xxxxxxxxxxxxx>
> > Sent: Friday, November 15, 2002 9:25 AM
> > Subject: [TechAssist] Fw: Zenith TV (SM2771S) NO video retrace lines
> bright
> > screen !
> >
> >
> > >
> > >
> > >
> > > > Fellow Tech's,
> > > >
> > > > Zenith SM2771S No video. (9-1447) Print needed.
> > > >
> > > > Hope some one can share a partial print, of video section. I am
> working
> > > off
> > > > a print for a SL 2767 and is close but not the same. I have a video
> > signal
> > > > to the Q1200 but from there can't follow. I have replaced the video
> > > > processor IC, LA 7672 still same problem. This schematic shows video
> to
> > > pin
> > > > 42 of the mentioned IC but there is none ,  Suspect video
transistor.
> > > >
> > > > thanks
> > > > Bruce
> > > >
> > > > B&T Electronics
> > > > 139 Margaret St
> > > > Sarnia Ontario
> > > > Canada
> > > > N7T 2Y3
> > > > (519) 344-1850
> > > > btied@xxxxxxxxxxxx
> > > >
> > >
> > >
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