[TechAssist] Re: Zenith flyback --FIXED
- From: "Intrepid Video Support" <support@xxxxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Sun, 20 Jul 2003 01:32:52 -0400
John,
This would only help if measurements were taken from OEM parts only, then we
could compare the generics we
have with the OEM.
Jeff Dougherty
Intrepid Video TV/VCR
263 S Front St
Steelton PA 17113
fax...717-564-4952
www.intrepid-video.com www.tech-repair.net
----- Original Message -----
From: "John at Main TV" <maintv@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, July 18, 2003 12:11 PM
Subject: [TechAssist] Re: Zenith flyback --FIXED
Yes, that would be easy to do. I have a cross reference on my computer
of horizontal outputs and I could just add a column for resistance
measurements. However there is a big difference from 1 transistor to
another or from 1 batch to another, perhaps more that from 1 type to
another. I have measured all the outputs I have in stock. I have not
found resistance readings in the spec sheets. If you think it would be
helpful let me know. John.
Intrepid Video Support wrote:
> John,
> I think what we should do is compile a list using OEM numbers.
> That E-B resistance makes a big difference on longevity of that part.
>
> Jeff Dougherty
> Intrepid Video TV/VCR
> 263 S Front St
> Steelton PA 17113
> fax...717-564-4952
> www.intrepid-video.com www.tech-repair.net
>
> ----- 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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>>>>>
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>>
>>>>*
>>>>
>>>>
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>
>
>
--
John Mielke
Main TV
Longmont,Co 80501
303 776 6955
303 776 0792 fax
maintv@xxxxxxxxxxx
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