[TechAssist] Re: Panasonic TV CT-3269SCW Chas. AMEDP311 repeatedly blows ...
- From: MDileo0000@xxxxxxx
- To: techassist@xxxxxxxxxxxxx
- Date: Tue, 30 Dec 2003 14:07:22 EST
Only after the identifier number, as in BU517D, if there are two numbers that
are the same. A 2SD1885 or 2SD5148 have no damper either.
Dominic DiLeo
Atlantic TV
Freeport, Maine
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In a message dated 12/30/03 1:59:22 PM Eastern Standard Time,
phil245@xxxxxxxxxxxxx writes:
> If therre is a D in the number its supposed to have a damper
> Phillip R Hull STET
> phil245@xxxxxxxxxxxxx
> FAX 517--569-3075
> Professional Technicians only
> ----- Original Message -----
> From: <MDileo0000@xxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Tuesday, December 30, 2003 1:34 PM
> Subject: [TechAssist] Re: Panasonic TV CT-3269SCW Chas. AMEDP311 repeatedly
> blows regu...
>
>
> > Gary,
> >
> > Info from a similar chassis ABP331.
> > The 2SD2539 is a non damper transistor, the 2SD1880 has a built in
damper.
> > Your regulated B+ should be 130VDC. This B+ passes thru a fusistor pair
> R808
> > and 809, 1 Ohm 1/2 watt. These pass B+ to/thru L803 and to pin 9 of the
> FBT
> > out pin 10 to the horiz out transistor. Horizontal driver Q501 is fed by
a
> > resistor pair R510, 511 3.6k 3wt.
> >
> > Let me know if this helps with your chassis layout.
> >
> > Dominic DiLeo
> > Atlantic TV
> > Freeport, Maine
> > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > In a message dated 12/30/03 11:13:08 AM Eastern Standard Time,
> > gary@xxxxxxxxxxx writes:
> >
> > > I have received the new regulator IC and HOT from Panasonic. I replaced
> > > a number of capacitors, D825 and it's filter cap, and I checked the
> > > flyback out of circuit with my HR Diemen flyback tester and it shows a
> > > good collector waveform and 30kv readout. I installed the new reg. but
> > > decided to use a 2SD1880 to test the set with until I know it is ok to
> > > install the (expensive) OEM HOT 2SD2539. I fired it up on 95V ac on
the
> > > variac. The set does not start up. I get 148V dc on cathode of D825
and
> > > I get 31V dc on the B+ pin on the flyback.
> > >
> > > I don't have a schematic to trace the reason for the B+ voltage drop
> > > between the source and the flyback. I am only assuming that the
cathode
> > > of D825 is the (130V?) B+ source for the flyback. Tried tracing it on
> > > the circuit board but got lost.
> > >
> > >
> > > Any help appreciated, especially a partial schematic for this this
> > > chassis or similar chassis which includes
> > > an STR58041A regulator.
> > >
> > >
> > >
> > >
> > > Gary McCartney
> > >
> > > McCartney Electronics
> > > Guelph Ontario Canada
> > > Est. 1984
> > > email: gary (at) number63.ca
> > >
> > >
> > >
> > >
> > >
> > >
> > > My original message:
> > >
> > >
> > > I have worked on this Panasonic 32" TV model CT-3269SCW Chassis
> AMEDP311
> > > about 4 times in the last year or so. One time the HOT and regulator
> > > (STR58041A) were blown and I replaced with OEM Panasonic parts along
> > > with a few supporting parts in the regulator circuit which I don't
> > > remember at the moment. Another time the flyback was shorted. About a
> > > month ago, the regulator was shorted so again I replaced with OEM part
> > > and today the customer called and said he is bringing the set back in
> > > first thing Monday morning, hoping to have it repaired for Christmas.
> He
> > > heard a POP and the set went dead.
> > >
> > > It seems there must be something I am missing when I'm replacing HOT's
> > > and regulators on this set. Is there a service bulletin or a known
list
> > > of components which need attention while serving? I have soldered the
> > > hor. driver transformer. I don't work on many Panasonics but the ones
I
> > > do usually are dogs.
> > >
> > > I am wanting to be able to order parts by noon on Monday so I can
> > > hopfully get this set shipped before I close down for the holidays.
> > >
> > > Merry Christmas to everyone and thanks for any help.
> > > --
> > >
> >
>
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