[TechAssist] Re: Symphonic TVCR model WF0213C (mfgrd.2002)dead,whine
- From: Philip Bader <tjanphyl@xxxxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Fri, 25 Jul 2003 17:34:49 -0400
Follow up:
I did find another shorted zener diode D641
(DZ-36BSAT265/QDTAOOMTZJ36/NDTA00DZ36BS/MTZJT-7736A)
All above are part numbers for the zener. Cannot determine the voltage.
36volt???
It is connected directly to main switcher Q601 (2SK2662).
Phil Bader
Philip Bader wrote:
>
> Replaced D629 (1N4148),D615 (33V zener),Q606 (used a 2sa950/NTE290).
> Powered up good picture.waited 30 seconds, did a channel auto program.
> after another 30 seconds, sides flutuated,shut down.
> All my parts are OK.Plug in, smps does not whine. Have 5V standby at 5V
> reg IC602.
> Push power,can hear a slight chirp on sound,but never powers up.
> Phil Bader
>
> Philip Bader wrote:
> >
> > Appears to interconnect with several white ribbon cables.
> > At the risk of sounding ignorant, I am on the download site now,but
> > what's the file name? None appear to be the right one without opening
> > them all...
> > D615 you refer to as over voltage crowbar appears to be from my
> > research, a 33 volt zener.
> > My A1271Y transistor crosses to an NTE383 PNP.
> > Thanks in advance,
> > Phil Bader
> >
> > John at Main TV wrote:
> > >
> > > I am not familiar with that exact model number. Does the VCR mechanism
> > > unpluf from the board or is it connected to the board with ribbon cable?
> > > It appears your model is the same as Symphonic SC313C, Syl 6313CC,
> > > Emerson EWC1302 and that manual is on the tech-assist members area for
> > > download. There is also a cross reference for Funai combi's in the
> > > members area. (combi model cross). Please let me know how your
> > > mechanism attatchs to the board so I know which mechanism it is and I
> > > will add it to the "combi model cross".
> > > On your TV, Q606 is apparently the 12v power on switch/regulator and
> > > D615 is an over-voltage protection crowbar on the 25v line. If that is
> > > shorted it would make the power supply whine and not run. John.
> > >
> > > Philip Bader wrote:
> > > > Unresponsive.Dead.Fuses all OK.
> > > > Plug in and hear a very faint whine from the SMPS.
> > > > Testing found the following SMPS parts shorted:
> > > > Transistor Q606,(small case, A1271 on part).(2SA1271?)
> > > > Diode D615,, small black, Zener symbol on board: (on part:2.B, ZC, 33)
> > > > Diode D629, small glass.No# on part.
> > > > All shorted. Need parts ID on these, and possible pattern of known
> > > > damage from any histories on this symptom/model.
> > > > Possible lightning,considering our weather.
> > > > Phil Bader
> > >
> > > --
> > > John Mielke
> > > Main TV
> > > Longmont,Co 80501
> > > 303 776 6955
> > > 303 776 0792 fax
> > > maintv@xxxxxxxxxxx
> > >
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> > --
> > Philip Bader
> > Jan Phyl TV Inc. (estab. 1976)
> > 3420 Recker Hwy. Winter Haven, Fl. 33880
> > Fax (863) 299-8821
> > email: tjanphyl@xxxxxxxxxxxxxxx
> >
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> --
> Philip Bader
> Jan Phyl TV Inc. (estab. 1976)
> 3420 Recker Hwy. Winter Haven, Fl. 33880
> Fax (863) 299-8821
> email: tjanphyl@xxxxxxxxxxxxxxx
>
> *****************************************************************************
> Classifieds! Buy or Sell!
> http://sell.tech-assist.org
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> Add a Repair Tip Here, or Change/Remove your Email Address:
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--
Philip Bader
Jan Phyl TV Inc. (estab. 1976)
3420 Recker Hwy. Winter Haven, Fl. 33880
Fax (863) 299-8821
email: tjanphyl@xxxxxxxxxxxxxxx
*****************************************************************************
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