[TechAssist] Re: Panasonic TV CT-3269SCW Chas. AMEDP311 repeatedly blows regulator STR58041A [UPDATE]
- From: <support@xxxxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 31 Dec 2003 15:12:19 -0500
Gary,
From Tech Repair CD:
ZENITH\SYSTEM 3\Q551 SHORTED H.O.T.\\\\C820* IC803(STR58041A) BAD* ALSO CHECK
D825* Q801*R822\\\\\\\\
Also...IC801 (shutdown photo coupler)
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: "Gary McCartney" <gary@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Tuesday, December 30, 2003 11:14 AM
Subject: [TechAssist] Panasonic TV CT-3269SCW Chas. AMEDP311 repeatedly blows
regulator STR58041A [UPDATE]
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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