[TechAssist] Re: Zenith flyback --FIXED
- From: "J Silverman" <greentron@xxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 17 Jul 2003 13:36:37 -0400
The resistance does make difference. Somewhere in the full spec for the
device there is a permissable resistance range. I see the complaint over and
over again that when somebody has received a bad batch of HOTs that the b/e
resistor measured high. A couple of techs have posted that they measure the
resistor when they receive the part and have made a table of resistor values
for each part number, but it should also be available in the spec for the
part, if you can find it.
Jerry Silverman
Greentron Inc
4 Newland Ave
Greenville SC 29609
864 232 3889
Fax 271 2080
mailto:greentron@xxxxxxx
----- Original Message -----
From: "John at Main TV" <maintv@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, July 16, 2003 5:17 PM
Subject: [TechAssist] Re: Zenith flyback --FIXED
> I think a 2SD1881 should have a base-emitter resistance because it has a
> damper. (I always wondered if you can have a transistor with a damper
> but without base-emitter resisor). Note that a 2SD1882 and higher are
> in a different family without dampers. I once measured the base-emitter
> resistance of all the outputs I had in stock and found readings from 25
> to 70 ohms. I also found a 2 to 1 ratio of the resistances of the same
> transistor type but from different batches (or between "generic" and
> original) Does anyone know if this resistance make a difference in how
> hot the transistor will operate? I do not have a D1881 in stock but I
> just went thru a bag of D1880 and found resistances from 32 ohms to 47
> ohms with most of them at 40 ohms. John.
>
>
>
> Tri-County Tv wrote:
> > Jim,
> > I used a 2sd1881 and measured it before I installed it and it did
not
> > show any resistance from base to emitter. It was my last one and the TV
is
> > gone now, should a 2sd1881 have resistance from base to emitter? I know
what
> > you are referring to as I also have seen many HOT that have about 50
ohms
> > from base to emitter. And at first I thought the original was ok , until
I
> > checked it against my 2sd1881 which did not show any resistance.
> > Tom Berger
> > Tri-County TV
> > Robbinsville
> > North Carolina 28771
> > (tricountytv@xxxxxxxxxxxxx)
> > ----- Original Message -----
> > From: "Jim Myers" <jr.myers@xxxxxxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Wednesday, July 16, 2003 1:36 PM
> > Subject: [TechAssist] Re: Zenith flyback --FIXED
> >
> >
> >
> >>Tom, R-U sure? Most HO transistors have an internal base to emitter
> >
> > resistor
> >
> >>of about 45 ohms. This is a mistake we have all made at least once.
> >>**************************************************
> >>Jim Myers
> >>Since 1972
> >>Telrad Electronic Services Co.
> >>Fort Wayne, IN 46815
> >>*************************************************
> >>----- Original Message -----
> >>From: "Tri-County Tv" <tricountytv@xxxxxxxxxxxxx>
> >>To: <techassist@xxxxxxxxxxxxx>
> >>Sent: Wednesday, July 16, 2003 12:29 PM
> >>Subject: [TechAssist] Re: Zenith flyback --FIXED
> >>
> >>
> >>Jeff,
> >> Sorry it took a little while to get back to you, as I busy
kicking
> >>myself in the AXX as you were completely right, and I should have known
> >>better. The H.O. Transistor has a base to emitter short of 45 ohms, when
I
> >>checked it in circuit it read shorted but I took for granted it was just
> >>drive transformer secondary winding. But when you think about it
> >
> > logically,
> >
> >>it had to be the H.O.Transistor. Thanks Again , and to all who replied
so
> >>quickly.
> >>Tom Berger
> >>Tri-County TV
> >>Robbinsville
> >>North Carolina 28771
> >>(tricountytv@xxxxxxxxxxxxx)
> >>----- Original Message -----
> >>From: "Shoreline Electronics" <jstielau@xxxxxxxx>
> >>To: <techassist@xxxxxxxxxxxxx>
> >>Sent: Wednesday, July 16, 2003 12:23 PM
> >>Subject: [TechAssist] Re: Zenith flyback --need sub info
> >>
> >>
> >>
> >>>Remove the output transistor completely: Fire up the set and check for
> >>
> >>good
> >>
> >>>base drive...that will confirm your H-drive question:
> >>>
> >>>Try another output transistor to be sure....it really sounds like it's
> >>>defective...since PS is not squealing once you unsolder the collector.
> >>>
> >>>==========================
> >>>Jeff Stielau
> >>>Shoreline Electronics Repair
> >>>344 East Main Street
> >>>Clinton,CT 06413
> >>>860-399-1861
> >>>860-664-3535 (fax)
> >>>jstielau@xxxxxxxx
> >>>==========================
> >>>"If you push something hard enough it will fall over."
> >>>Fudd's First Law of Opposition - Sir Sidney Fudd
> >>>
> >>>
> >>>----- Original Message -----
> >>>From: "Tri-County Tv" <tricountytv@xxxxxxxxxxxxx>
> >>>To: <techassist@xxxxxxxxxxxxx>
> >>>Sent: Wednesday, July 16, 2003 12:14 PM
> >>>Subject: [TechAssist] Re: Zenith flyback --need sub info
> >>>
> >>>
> >>>
> >>>>Jeff,
> >>>> I checked that and it's good.I did notice that there is no b+
> >>>
> >>>getting
> >>>
> >>>>to the driver transformer and I'm not sure if I should have voltage
> >>>
> >>there
> >>
> >>>>when you first plug it in.
> >>>>Tom Berger
> >>>>Tri-County TV
> >>>>Robbinsville
> >>>>North Carolina 28771
> >>>>(tricountytv@xxxxxxxxxxxxx)
> >>>>----- Original Message -----
> >>>>From: "Shoreline Electronics" <jstielau@xxxxxxxx>
> >>>>To: <techassist@xxxxxxxxxxxxx>
> >>>>Sent: Wednesday, July 16, 2003 12:02 PM
> >>>>Subject: [TechAssist] Re: Zenith flyback --need sub info
> >>>>
> >>>>
> >>>>
> >>>>>Your Horizontal Output is probably shorted.
> >>>>>
> >>>>>==========================
> >>>>>Jeff Stielau
> >>>>>Shoreline Electronics Repair
> >>>>>344 East Main Street
> >>>>>Clinton,CT 06413
> >>>>>860-399-1861
> >>>>>860-664-3535 (fax)
> >>>>>jstielau@xxxxxxxx
> >>>>>==========================
> >>>>>"If you push something hard enough it will fall over."
> >>>>>Fudd's First Law of Opposition - Sir Sidney Fudd
> >>>>>
> >>>>>
> >>>>>----- Original Message -----
> >>>>>From: "Tri-County Tv" <tricountytv@xxxxxxxxxxxxx>
> >>>>>To: <techassist@xxxxxxxxxxxxx>
> >>>>>Sent: Wednesday, July 16, 2003 11:19 AM
> >>>>>Subject: [TechAssist] Zenith flyback --need sub info
> >>>>>
> >>>>>
> >>>>>
> >>>>>>Hello,
> >>>>>> I got this zenith color TV model SS2761S , module 9-913
> >>>>>
> >>,and
> >>
> >>>>the
> >>>>
> >>>>>flyback had a slit in the side with stuff oozzing out , Flyback #
> >>>>
> >>>95-4203
> >>>
> >>>>,
> >>>>
> >>>>>when you look this # up on tritronics, it shows a 95-4203-REP for 17
> >>>>>dollars, so I ordered it, and installed it into the module and now ,
> >>>>
> >>>when
> >>>
> >>>>>you plug it in, the ps squeals, so I replaced all the usual ps
> >>>>
> >>>components,
> >>>
> >>>>>and same problem,also checked for shorts on secondary of fly and
> >>>>
> >>>>everything
> >>>>
> >>>>>looks ok, If I disconnect the collector of the HOT it stops
> >>>>
> > squealing
> >
> >>>and
> >>>
> >>>>ps
> >>>>
> >>>>>voltages return to normal, however I am not reading and B+ on any
> >>>>
> > legs
> >
> >>>of
> >>>
> >>>>>the driver transformer, I do not have the schematic and would
> >>>>
> > greatly
> >
> >>>>>appreciate if someone could upload one. Could this replacement fly
> >>>>
> > be
> >
> >>>the
> >>>
> >>>>>trouble? Has anyone had experience with this flyback?
> >>>>>
> >>>>>>Tom Berger
> >>>>>>Tri-County TV
> >>>>>>Robbinsville
> >>>>>>North Carolina 28771
> >>>>>>(tricountytv@xxxxxxxxxxxxx)
> >>>>>>
> >>>>>
> >
****************************************************************************
> >
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>
> --
> John Mielke
> Main TV
> Longmont,Co 80501
> 303 776 6955
> 303 776 0792 fax
> maintv@xxxxxxxxxxx
>
>
>
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