[TechAssist] Re: RCA 32GT720 chassis CTC203CF3 no power blows Q14401
- From: Mike Barnett <passthecash@xxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Tue, 20 Nov 2001 19:18:00 -0800 (PST)
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
> >
> >
> >
> >
> >
> >
>
>
____________________________________________________________________________
> __
> > Send a friend your Buddy Card and stay in contact always with Excite
> Messenger
> > http://messenger.excite.com
> >
> >
> > *****************************************
> > Help make your TechAssist online repair tips
> > database better! Submit your fixes here:
> > http://www.circuitwork.com/techassist/tip/#tips
> > *****************************************
> > To UNSUBSCRIBE write to:
> > techassist-request@xxxxxxxxxxxxx
> > with unsubscribe in the subject line.
>
> *****************************************
> Help make your TechAssist online repair tips
> database better! Submit your fixes here:
> http://www.circuitwork.com/techassist/tip/#tips
> *****************************************
> To UNSUBSCRIBE write to:
> techassist-request@xxxxxxxxxxxxx
> with unsubscribe in the subject line.
>
>
>
>
>
> _______________________________________________________
> http://inbox.excite.com
>
>
> *****************************************
> Help make your TechAssist online repair tips
> database better! Submit your fixes here:
> http://www.circuitwork.com/techassist/tip/#tips
> *****************************************
> To UNSUBSCRIBE write to:
> techassist-request@xxxxxxxxxxxxx
> with unsubscribe in the subject line.
*****************************************
Help make your TechAssist online repair tips
database better! Submit your fixes here:
http://www.circuitwork.com/techassist/tip/#tips
*****************************************
To UNSUBSCRIBE write to:
techassist-request@xxxxxxxxxxxxx
with unsubscribe in the subject line.
_______________________________________________________
http://inbox.excite.com
=================================
Help make your TechAssist database better!
Submit your fixes here: http://circuitwork.com/techassist/tip/#tips
=================================
To UNSUBSCRIBE your email address, click here:
mailto:techassist-request@xxxxxxxxxxxxx?subject=unsubscribe
Other related posts:
