[TechAssist] Re: MAG: 25X6 chassis Quick Question?
- From: "repair1" <repair1@xxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Mon, 21 Jan 2002 11:10:06 -0600
I have been using a light bulb in place of fuse for thirty years since my
days at sears, back then we would solder a fuse to the socket prongs then
break glass to just snap fuse in holder, of course most fuses were the same
size, what I do anymore, is solder clip leads to socket prongs(I put heat
shrink over prongs) very quick, will fit any where. have a good day
charles Betzler
Best Electronics
repair1@xxxxxxxxxxxxx
----- Original Message -----
From: "Electric Medic" <info@xxxxxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Sunday, January 20, 2002 12:12 PM
Subject: [TechAssist] Re: MAG: 25X6 chassis Quick Question?
>
> Ed:
>
> I like it. I think I will make a jig on plywood, paint it real nice, and
> maybe our techs will try it on our next set with a short circuit, or
shorted
> flyback.
>
> Perry Bower
> Electric Medic
> "It's Cheaper to Keep Her"
> 3850 Washington Road Suite 5b
> Martinez, Georgia 30907
> Phone: 706-8MEDIC4 (863-3424)
> Phone: 706-863-3474
> Fax: 706-863-2316
> Website: www.electricmedic.com
> mailto:info@xxxxxxxxxxxxxxxxx
> "WE REPAIR WITH CARE"
> More Info: www.augusta-ga.bbb.org/report.html?compid=6001278&national=y
>
> Factory Trained Authorized Service Center For: Fisher, GE, KEC/KTV,
Konka,
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>
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>
> -----Original Message-----
> From: techassist-bounce@xxxxxxxxxxxxx
> [mailto:techassist-bounce@xxxxxxxxxxxxx]On Behalf Of Edward Gaidies
> Sent: Sunday, January 20, 2002 10:16 AM
> To: techassist@xxxxxxxxxxxxx
> Subject: [TechAssist] Re: MAG: 25X6 chassis Quick Question?
>
>
>
> Perry;
> You don't need to solder a light bulb in. You make up a little jig, with
the
> light bulb in series with an AC receptacle, on a little sheet of plywood.
> Then plug the TV under test directly into the AC receptacle.
>
> -Ed-
>
> >
> > Friends:
> >
> > We used to use the light bulb test on Motorola base stations to find
> shorts
> > after lightning strikes. If the bulb had a bright glow, you had shorts
to
> > find. We just simply repaired circuits until the bulb went dim. But
those
> > had a round screw in fuse the same size as a light bulb. We have found
on
> > most TV's, if you run your powerite down to around 80 volts, you may not
> > blow any parts if the flyback is bad, however, the flyback will get
warm,
> or
> > in some cases might even smoke a little. The best way though is to use a
> > Sencore VG92, and do a load test, with everything in circuit. It will
> check
> > your timing and loads, you will know in less than five minutes if your
> > flyback is bad. That is just what works for us. It is hard to get my
young
> > techs to solder a light bulb socket into a little TV chassis. They try
to
> > come up with quicker test. My 2 cents.
> >
> > Perry Bower
> > Electric Medic
> > "It's Cheaper to Keep Her"
> > 3850 Washington Road Suite 5b
> > Martinez, Georgia 30907
> > Phone: 706-8MEDIC4 (863-3424)
> > Phone: 706-863-3474
> > Fax: 706-863-2316
> > Website: www.electricmedic.com
> > mailto:info@xxxxxxxxxxxxxxxxx
> > "WE REPAIR WITH CARE"
> > More Info: www.augusta-ga.bbb.org/report.html?compid=6001278&national=y
> >
> > Factory Trained Authorized Service Center For: Fisher, GE, KEC/KTV,
> Konka,
> > Mitsubishi, Panasonic, Philips Magnavox, Pioneer, ProSCAN, RCA, Samsung,
> > Sanyo, Sharp, SONY, Technics, Zenith
> >
> > Provide Extended care for: AON, Circuit City, GE Contracts, Glass
Agency,
> > Philips Contracts, NEW, Rex
> >
> >
> > -----Original Message-----
> > From: techassist-bounce@xxxxxxxxxxxxx
> > [mailto:techassist-bounce@xxxxxxxxxxxxx]On Behalf Of Dennis Viereck
> > Sent: Sunday, January 20, 2002 2:22 AM
> > To: techassist@xxxxxxxxxxxxx
> > Subject: [TechAssist] Re: MAG: 25X6 chassis Quick Question?
> >
> >
> >
> > No need to blow up any parts. Use a 40 watt light bulb in series with
the
> B+
> > to
> > the flyback. Connect your oscilloscope to the collector of the
horizontal
> > output
> > transistor. Set the scope to resolve a 600 volt PP signal at 10 micro
> > seconds
> > per division. Power up the set an look for a clean undistorted pulse
with
> a
> > duty
> > cycle of 11.7 microseconds "OFF" time and a "ON" time of 51.7
> microseconds.
> >
> > Any extra ringing or distortion means you have a heavy load on the
> secondary
> > or
> > an internal shorted winding.
> >
> > The light bulb saves components, and buys time to measure the "Must
Haves"
> > in
> > that circuit. Sometimes only 2 or 3 seconds is necessary to make this
> > measurement. Most of the time after a short test like this and it is a
> > flyback,
> > one can feel the heat generated in the flyback by the bad winding or
diode
> > stack.
> >
> > Dennis Viereck
> >
> > Bill McFarland wrote:
> >
> >> Hey no problem,
> >>
> >> The old "N" chassis used to do this all the time (The flyback was
almost
> >> always bad)
> >>
> >> I was just wondering if anyone could say "Yea those crap the bed all
the
> >> time!" It would give me a little more to go on when on Monday I use my
> >> "Stone-aged" BK 1077 to ring it. (Its only about 75% effective...And
that
> >> only if the flyback is completely out of the unit)
> >>
> >> I hate blowing parts up!
> >>
> >> Funny thing is now that "I" am the one paying for the parts. I sure am
a
> > lot
> >> more careful about things like this. When I worked for someone else it
> was
> >> faster to just change the HOT and Reg. and see if it blows the HOT back
> > up!
> >> (I was young...What can I say)
> >>
> >> Good luck, God Bless
> >> Bill McFarland
> >> DMC Electronics
> >> Salt Lake City, Utah
> >>
> >> ----- Original Message -----
> >> From: Dennis Viereck <wa6ati@xxxxxxxxxxxxxx>
> >> To: <techassist@xxxxxxxxxxxxx>
> >> Sent: Saturday, January 19, 2002 8:37 PM
> >> Subject: [TechAssist] Re: MAG: 25X6 chassis Quick Question?
> >>
> >>>
> >>> Opps... I can't read.... Never mind. You might be right......
> >>> Dennis Viereck
> >>>
> >>> Dennis Viereck wrote:
> >>>
> >>>> Depending on how the STR is shorted, I would the think the set would
> >> still
> >>>> run. Assuming the AC line voltage is reduced enough to achieve 130VDC
> > at
> >> the
> >>>> output of the regulator. This is a simple linear regulator and easily
> >>>> bypassed.
> >>>>
> >>>> A "Shorted" STR certainly would not point me in he direction of the
> >> flyback.
> >>>> Maybe if you had a shorted horizontal output transistor, I might feel
> >>>> inclined to agree with you. But certainly not on 1 shorted part and
> >>>> intestinal feelings......
> >>>>
> >>>> Dennis Viereck
> >>>>
> >>>> Bill McFarland wrote:
> >>>>
> >>>>> Hello all,
> >>>>>
> >>>>> I am working on a 25X6 Maggot-box.
> >>>>>
> >>>>> Shorted HOT, Bad STR30130 Regulator.
> >>>>>
> >>>>> My gut tells me the flyback is probably bad as well.
> >>>>>
> >>>>> Can anyone tell me if the Flyback is a common failure item in this
> >> unit?
> >>>>>
> >>>>> Good luck, God Bless
> >>>>> Bill McFarland
> >>>>> DMC Electronics
> >>>>> Salt Lake City, Utah
> >>>>>
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> --
> From: Ed Gaidies
> teltek@xxxxxxxxxxx
> Tel-Tek Electronics
>
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