[TechAssist] Re: RCA 32GT720 chassis CTC203CF3 no power blows Q14401
- From: "Jorge Miret" <jmiret@xxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 21 Nov 2001 09:22:27 -0400
Hi Mike:
Check Q1402,Q1403,R14105,R14107,R14125 and R14111 also check for bad solder
connection on sw.mode transformer pin#1 that goes to R14105.
Good luck.
Jorge.
----- Original Message -----
From: Mike Barnett <passthecash@xxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Tuesday, November 20, 2001 11:18 PM
Subject: [TechAssist] Re: RCA 32GT720 chassis CTC203CF3 no power blows
Q14401
>
> Today i changed the fly with a brand new one, changed the reg and put a
new
> hot in too, checked both the primary ps and hot curcuit carefuly. could
not
> find anything bad. So i put power too it and emediatly when plugged in
main
> fuse blows also causing q14101 to short also. any ore sugestions on the
set
> would be great.
>
> Thanks,
> Mike
>
> On Fri, 16 Nov 2001 19:08:05 -0500, techassist@xxxxxxxxxxxxx wrote:
>
>
> Is the q that keeps blowing the hot or the b+ regulator? I don't have
that
> print. What you must do is cut the circuit in half......is it the h.o.
> circuit or the power supply. Get the horizontal out of the picture by
> disconnecting the fly and put a load ( l.bulb)on the 135 volt rail. You
> obviously don't have a dc short on the transistor (you don't do you?)
> which
> leads me to believe it's the fly. Get it out of there and see. I have
the
> Sencore HA2500 Horizontal Analyzer which makes quick work of this kind
of
> stuff.
>
>
>
>
> ----- Original Message -----
> From: "Mike Barnett" <passthecash@xxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Friday, November 16, 2001 10:53 AM
> Subject: [TechAssist] Re: RCA 32GT720 chassis CTC203CF3 no power blows
> Q14401
>
>
> >
> > Thanks for the suggustion, i've heard of this test however i have
never
> > tried it. Can you explain the result of this test in a good and bad
> sinario.
> > The problem is that in order to keep testing other things on this
board
> i
> > have to keep replacing q14401 and the fuse. as soon as i plug the set
in
> the
> > main and q14401 blows. with a new q14401 and fuse in place, and
> implementing
> > your suggestion, if the fly is bad i'm thinking than q14401 should be
> stable
> > and the fuse sould not blow. However if it is not bad(fly) q14401
should
> > blow and the bulb should light? Please correct me if i'm wrong.
> >
> > TIA,
> > Mike
> >
> >
> > On Thu, 15 Nov 2001 09:22:48 -0500, techassist@xxxxxxxxxxxxx wrote:
> >
> >
> > sounds like the fly. desolder hot and fly primary and put a light
bulb
> in
> > place of fly primary b+ input to ground.
> >
> >
> > ----- Original Message -----
> > From: "Mike Barnett" <passthecash@xxxxxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Thursday, November 15, 2001 9:14 AM
> > Subject: [TechAssist] RCA 32GT720 chassis CTC203CF3 no power blows
> Q14401
> >
> >
> > >
> > > Hi guys, RCA chassis # CTC203CF3 Set blows main fuse and Q14401.
I
> > changed
> > > Q14401 and the two small transistors in curcuit(Q14402/pt#147665
and
> > Q14403
> > > pt#232218) I checked the horizonal curcuit but found nothing to be
> bad.
> > > Changed HOT anyway and checked all diodes in both curcuits. None
are
> > bad.
> > > Cant seem to find anything shorted on the board. After carefull
> > inspection
> > i
> > > did notice that the insulator of q14401 is very thin and seemed
that
> in
> > > removal of the original device i may have comprimised the
insulator.
> i
> > put
> > a
> > > new one on and changed q14401 again and checked it carefuly.
plugged
> the
> > set
> > > in blows again both q14401 and the main fuse. Does anyone have
any
> info
> > on
> > > this chassis? Please help.
> > >
> > > TIA
> > >
> > > Mike
> > >
> > >
> > >
> > >
> > >
> > >
> > > Get It Fixed At
> > > Rochester Electronics
> > > 630 West Ridge Rd.
> > > Rochester, NY 14615
> > > 716.663.6870
> > > www.RochesterElectronicsRepair.com
> > >
> > >
> > >
> > >
> > >
> > >
> >
> >
>
>
____________________________________________________________________________
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