[TechAssist] Re: Panasonic CTV # CTK-2790S, Chassis# AEDP152 or GL7C Repeat IC801 failure
- From: "tvservice" <tvservice@xxxxxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 18 Sep 2002 09:01:17 -0500
Dale,
I think it was D825 near vertical output remove and discard
this diode may become leaky and cause problems, there was a bulletin years
ago on this problem.
try this web site for tips:
http://www.pasc.panasonic.com/olt/TV.htm
Robert
tvservice@xxxxxxxxxxxxxxxxxxx
H & H Electronics Inc
----- Original Message -----
From: "Gary McCartney" <number63@xxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Tuesday, September 17, 2002 6:53 PM
Subject: [TechAssist] Re: Panasonic CTV # CTK-2790S, Chassis# AEDP152 or
GL7C Repeat IC801 failure
>
> Dale, I had a similar problem with my own TV, only it is the 31" version
> of the same chassis.
> I'll send you the information I have. Mine would blow the reg. about
> once per month rather than after 2 minutes. Finally I noticed a trace
> blown open, and from memory I believe it was from one of the STR60001
> reg. pins to zener D805, thereby effectively removing D805 from the
> circuit altogether. There is also a diode which is to be removed from
> the circuit if it is present. I'll do a bit more research to find that
> info for you.
>
>
>
> Gary McCartney
>
> McCartney Electronics
> 7134 Fife Rd, RR 7
> Guelph Ontario Canada N1H 6J4
> Fax: (519)821-1530
> email: number63 (at) inetsonic.com
>
>
>
>
>
>
>
> HarrisTV50010@xxxxxxx wrote:
> >
> > We have a Panasonic CTV Model# CTK-2790S Chassis# AEDP152 or GL7C. This
unit
> > came in with the complaint of popped and went dead. We found C821, IC801
&
> > D805 shorted. Q801 has a hole blown out of it and R826 was open.
> > We replaced C821, IC801, D805, Q801, R826, C807 & R825. After replacing
these
> > parts the set worked for a couple of minutes with all the proper
voltages
> > coming out of it. Then it suddenly went dead. We found IC801 had gone
bad
> > again. We replaced it, shorted the power relay and slowly brought up the
AC
> > going into the set. The B+ coming out of the secondary of the switching
> > transformer T801 are normal. The IC starts to get hot. The waveform on
the
> > collector (pin 3 ) of IC 801 seems normal except the frequency seems to
> > quiver too much and the base (pin 2) of IC801 is supposed to be 14v p-p
but
> > we only get about 4v p-p with the same frequency quivering as the
collector.
> > We have checked every other part on the primary of the power supply and
> > everything seems OK. Sorry for writing a novel about this unit. Does any
one
> > have any notes on possible problems with this power supply?
> >
> > TIA,
> > Dale
> >
> > Dale A. Lubow... HarrisTV50010@xxxxxxx ..515-232-1109..(Fax)515-232-3356
> > Harris TV & Appliance..........335 Lincoln
> > Way.....Ames.....Iowa.....50010-3384
> >
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> --
>
>
>
> Gary McCartney
>
> McCartney Electronics
> 7134 Fife Rd, RR 7
> Guelph Ontario Canada N1H 6J4
> Fax: (519)821-1530
> email: number63 (at) inetsonic.com
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