[TechAssist] Re: FIXED Magnavox XS2552 C102, chassis 25P613-00AA, blows HOT immediately, need to know value of B+

  • From: "becyn" <becyn@xxxxxxxxxx>
  • To: <techassist@xxxxxxxxxxxxx>
  • Date: Fri, 21 May 2004 13:31:11 -0400

As Al said, I think you need to do some study on the theory of operation. It
will help tremendously in you troubleshooting efforts.

I have a saying that I use here; "You can't efficiently fix something unless
you know how it works". Serendipity goes just so far...

Jim McVey
McVey Alltronix
327 Broadway
Newburgh Ny 12550
ph: 845 561 8383
fx: 845 561 9017
Consumer electronics &
computer service.
Factory authorized for
over twenty brands.
----- Original Message ----- 
From: "Kevin" <kevintv@xxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Thursday, May 20, 2004 10:58 PM
Subject: [TechAssist] Re: FIXED Magnavox XS2552 C102, chassis 25P613-00AA,
blows HOT immediately, need to know value of B+


> So the timing cap keeps the flyback primary pulse within the specs of
> the HOT?  I have also had a bad connection on the timing cap and all
> that happened was the picture was affected.  Does whether the HOT is
> shorted or not depend on the design of the circuit?
>
> Kevin Wilks
> Kevin's TV & Video Repair
> Penticton BC Canada
> kevintv@xxxxxxx
>
>
> -----Original Message-----
> From: techassist-bounce@xxxxxxxxxxxxx
> [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of becyn
> Sent: Thursday, May 20, 2004 3:34 PM
> To: techassist@xxxxxxxxxxxxx
> Subject: [TechAssist] Re: FIXED Magnavox XS2552 C102, chassis
> 25P613-00AA, blows HOT immediately, need to know value of B+
>
> It will send the flyback primary pulse over the C-E 0r C-B ratings of
> the
> H-out.(not to mention the timing skew)
>
> Jim McVey
> McVey Alltronix
> 327 Broadway
> Newburgh Ny 12550
> ph: 845 561 8383
> fx: 845 561 9017
> Consumer electronics &
> computer service.
> Factory authorized for
> over twenty brands.
> ----- Original Message ----- 
> From: "Kevin" <kevintv@xxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Thursday, May 20, 2004 5:47 PM
> Subject: [TechAssist] Re: FIXED Magnavox XS2552 C102, chassis
> 25P613-00AA,
> blows HOT immediately, need to know value of B+
>
>
> > Timing capacitor, C505 9.1 nF @ 1600 volts, was open (measured 20 pF).
> > I used C5149 for the HOT.  Thanks for all the replies.
> >
> > Why would this bad timing cap cause the HOT to short immediately after
> > turning the set off?  Thanks.
> >
> > Kevin Wilks
> > Kevin's TV & Video Repair
> > Penticton BC Canada
> > kevintv@xxxxxxx
> >
> >
> > -----Original Message-----
> > From: techassist-bounce@xxxxxxxxxxxxx
> > [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of
> gulftech@xxxxxxxx
> > Sent: Thursday, May 20, 2004 6:23 AM
> > To: techassist@xxxxxxxxxxxxx
> > Subject: [TechAssist] Re: Magnavox XS2552 C102, chassis 25P613-00AA,
> > blows HOT immediately, need to know value of B+
> >
> > Kevin,
> >
> > First, I don't like NTE or SK replacements, especially for HOT's.
> Next,
> > it is always best to start with the original.  If you don't have the
> > original, cross it to a generic with equal or better specs.  If you
> > cross
> > it to an NTE and then try to use a generic that also crosses to the
> same
> > NTE is not reliable.  The D1849 is a 7A, 120 wt, w/ damper.  The NTE,
> is
> > lower gain and lower power rating (70 wt).  If you must use an NTE,
> try
> > an NTE2318.
> >
> > Still, I am concerned about the HOT shorting immediately.  Check for
> > open
> > safely caps in the horizontal deflection.  Often, you can see them
> > cracked and a little carbon burn on them.  This would cause you high
> > voltage to run way high and take out the HOT.
> >
> > HTH,
> >
> >
> > Ken Smith
> > Gulf Technical Services
> > 3034 Gulf Breeze Parkway
> > Gulf Breeze, FL  32563
> > 850-934-8324 (Voice) 850-932-0819 (Fax)
> >
> >
> > On Wed, 19 May 2004 16:20:01 -0700 Kevin <kevintv@xxxxxxx> writes:
> > > I used a D1849 which crosses to an NTE 2353.  I don't have the exact
> > > Phillips replacement.  I have done this before many times before
> > > with no
> > > call backs.  Even if the D1849 wasn't exactly the same as the
> > > Phillips
> > > part, it should be good enough for test purposes.  It should not
> > > fail in
> > > 1 second.  What, in your estimation, is the best generic sub for NTE
> > > 2353?
> > >
> > > Kevin Wilks
> > > Kevin's TV & Video Repair
> > > Penticton BC Canada
> > > kevintv@xxxxxxx
> > >
> > >
> > > -----Original Message-----
> > > From: techassist-bounce@xxxxxxxxxxxxx
> > > [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of
> > > gulftech@xxxxxxxx
> > > Sent: Wednesday, May 19, 2004 3:05 PM
> > > To: techassist@xxxxxxxxxxxxx
> > > Subject: [TechAssist] Re: Magnavox XS2552 C102, chassis 25P613-00AA,
> > > blows HOT immediately, need to know value of B+
> > >
> > > Kevin,
> > >
> > > Quit using those darn NTE outputs and buy a good stock of real
> > > transistors.  You end up beating yourself to death because of a bad
> > > sub
> > > and think it's something else.  Costs you time, money, and patience.
> > >
> > >
> > > Ken Smith
> > > Gulf Technical Services
> > > 3034 Gulf Breeze Parkway
> > > Gulf Breeze, FL  32563
> > > 850-934-8324 (Voice) 850-932-0819 (Fax)
> > >
> > >
> > > On Wed, 19 May 2004 12:49:10 -0700 Kevin <kevintv@xxxxxxx> writes:
> > > > I measured the B+ before I installed the HOT by putting a 110 ohm,
> > > 30
> > > > watt resistor from collector to ground.  The B+ measured 127
> > > volts,
> > > > and
> > > > the STR30130 was ouputting 130.2 volts.  Thinking everything was
> > > > good, I
> > > > installed the new HOT (Q502 NTE 2353) and turned the set on.  The
> > > HV
> > > > came up but 'sounded funny', so I quickly turned the TV off and
> > > > discovered a totally black fuse and shorted HOT.  My flyback rings
> > > > good.
> > > > Could it still be a bad flyback?
> > > >
> > > > Kevin Wilks
> > > > Kevin's TV & Video Repair
> > > > Penticton BC Canada
> > > > kevintv@xxxxxxx
> > > >
> > > >
> > > >
> > > >
> > > >
> > >
> >
> >
> >
> >
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