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

  • From: Kevin <kevintv@xxxxxxx>
  • To: techassist@xxxxxxxxxxxxx
  • Date: Fri, 21 May 2004 14:52:37 -0700

First year Calculus college.  91% average in Math for my Technologist
Degree.  

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: Friday, May 21, 2004 2:48 PM
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] Re: FIXED Magnavox XS2552 C102, chassis
25P613-00AA, blows HOT immediately, need to know value of B+

Nobody knows how to explain it to to you.
What's your background?
I can try to do "TV for dummies", but that would take too long for this
forum.
...or do it mathematically, which is the easiest way to show what's
going
on.
Can you handle tech math and light calculus?

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: Friday, May 21, 2004 3:29 PM
Subject: [TechAssist] Re: FIXED Magnavox XS2552 C102, chassis
25P613-00AA,
blows HOT immediately, need to know value of B+


> Nobody knows the answer, I guess.
>
> 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: Friday, May 21, 2004 10:31 AM
> To: techassist@xxxxxxxxxxxxx
> Subject: [TechAssist] Re: FIXED Magnavox XS2552 C102, chassis
> 25P613-00AA, blows HOT immediately, need to know value of B+
>
> 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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