[TechAssist] Re: Zenith flyback --FIXED
- From: <tvservice@xxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 17 Jul 2003 10:04:15 -0500
if it helps
every new 2sd1880/81 transistor i have used over the last several years has
@ 45-50 ohms internal resistance across base and emitter.
This is normal and if it is lower than 45 ohms its bad if its over 50 ohms
its bad. I have beckman and fluke meters and they all read same resistance.
if you have a meter reading 50 ohms as 150 ohms your meter needs repair,
check against a known resistor value for comparison.
Robert
tvservice@xxxxxxxxxxxxx
H & H Electronics Inc
Dallas, TX
----- Original Message -----
From: "Tri-County Tv" <tricountytv@xxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, July 16, 2003 6:11 PM
Subject: [TechAssist] Re: Zenith flyback --FIXED
> Jim,
> Your right about having an internal resistor, even the ecg books
> shows a resistor but does not indicate what the value should be. The
2sd1881
> I had was from tritronics, came in a SK bag, not sure if it was ordered as
> generic a while back. I am certain the new one did not have any resistance
> under 500 ohms form base to emitter as that is what made me think the
> original was bad, because it did have low resistance. I'm just glad it's
> fixed.
> 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 5:21 PM
> Subject: [TechAssist] Re: Zenith flyback --FIXED
>
>
> > Tom,
> > This data sheet info shows a base to emitter resistor in all 2SD1876
thru
> > 2SD1881 devices as well as an internal damper diode:
> > http://www.tenfourltd.com/pdf/SY111A_e.pdf
> > but does not say what the resistance value is. If replacing a 2SD1881
with
> a
> > 2SD1881 fixed the set for you then there is no doubt it was defective.
The
> > common failure is the internal damper diode shorts or becomes leaky. My
> > reason for alerting you to a possible error was in case you had to order
> and
> > wait for a replacement only to find your wait was in vain.
> > **************************************************
> > 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 3:44 PM
> > Subject: [TechAssist] Re: Zenith flyback --FIXED
> >
> >
> > 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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