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

  • From: "Jerome Silverman" <greentron@xxxxxxxxxxxxxxxx>
  • To: <techassist@xxxxxxxxxxxxx>
  • Date: Thu, 20 May 2004 22:22:55 -0400

The lower the value of that capacitor, the higher the peak voltage at the
HOT. Some circuits used two caps in parallel so that if one opened, the
other would still be able to limit the voltage at the HOT collector.
Jerry Silverman
Greentron Inc
4 Newland Ave Greenville SC 29609
864 232 3889 Fax 271 2080
greentron@xxxxxxx
----- 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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