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

  • From: "al m" <ampm@xxxxxxx>
  • To: <techassist@xxxxxxxxxxxxx>
  • Date: Thu, 20 May 2004 23:36:01 -0400

Kevin it sounds like you're not equipped for this type problem. Do you have
any type of equipment to check the timing on the hot? Do you have any
equipment for checking the timing caps? Are you just starting with little or
no equipment? Don't take this personally but the questions you ask sounds
like you're just starting. If you are you will get good help here. The bad
connection was because the cap was still working partially, I can send you
some sencore training on the HOT circuit if you don't have any.
Al Marquardt
ampm@xxxxxxx
Al Marquardt Electronic Repair
206 W Main
Girardville Pa. 17935
----- 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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