[TechAssist] Re: Zenith flyback --FIXED
- From: "J Silverman" <greentron@xxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 17 Jul 2003 13:18:07 -0400
25 to 50 ohms seems to be the normal range. When they read much above that,
the HOT doesnt usually last very long. A lot of techs are now measuring the
b/e resistor when they receive the parts and send them back if it is high.
If you are measuring high values on known good OEM parts, you need to check
the calibration on your meter.
Jerry Silverman
Greentron Inc
4 Newland Ave
Greenville SC 29609
864 232 3889
Fax 271 2080
mailto:greentron@xxxxxxx
----- Original Message -----
From: "teltek3" <teltek3@xxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, July 16, 2003 2:48 PM
Subject: [TechAssist] Re: Zenith flyback --FIXED
> Jim;
> 45 ohms??? I normally read 120 to 145 ohms..are you sure about 45?
>
> -Ed-
> Tel-Tek Electronics
> Ontario-Canada
> teltek3@xxxxxxxxxxxx
> ----- 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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