[TechAssist] Re: Toshiba TP55F80 (TAC9678 chassis) hard shutdown
- From: "tvservice" <tvservice@xxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Fri, 27 May 2005 08:53:01 -0500
Sorry Bob
the STK's are not -020 but STK392-110
I use Hitachi #CZ00433 stk392-150 as a replacements never had a bad one.
Robert
tvservice@xxxxxxxxxxxxx
H & H Electronics Inc
----- Original Message -----
From: "tvservice" <tvservice@xxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, May 27, 2005 8:45 AM
Subject: [TechAssist] Re: Toshiba TP55F80 (TAC9678 chassis) hard shutdown
> Yes the "F" line did have yoke problems especially the blue also
STK392-020
> in the convergence caused intermittent shutdown.
> try swapping both the stk's with new parts for test.
> will send you shutdown flowcharts privately
> Robert
> tvservice@xxxxxxxxxxxxx
> H & H Electronics Inc
>
> ----- Original Message -----
> From: "Jeff Farnsworth" <jlfonz@xxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Friday, May 27, 2005 7:47 AM
> Subject: [TechAssist] Re: Toshiba TP55F80 (TAC9678 chassis) hard shutdown
>
>
> > I believe others can verify that the yokes on these have intermittant
> shorts
> > that cause this problem. The head banger I had was the blue but I heard
> > that the other colors can also fail.
> >
> > TV Doctor
> > Avalon, Wi
> >
> > ----- Original Message -----
> > From: "Gemini Computer & TV" <geminitv@xxxxxxxxxxx>
> > To: "Techassist" <techassist@xxxxxxxxxxxxx>
> > Sent: Friday, May 27, 2005 6:05 AM
> > Subject: [TechAssist] Toshiba TP55F80 (TAC9678 chassis) hard shutdown
> >
> >
> > > I have a customer with a Toshiba TP55F80 that has a hard shutdown
> problem.
> > I
> > > am not a Toshiba ASC so I seldom see these and therefore not too
> familiar
> > > with them and also have no service literature. The set may run between
a
> > > minute to 15 or 20 minutes with no noticeable symptoms and then it
> > > completely shuts down with the power LED continously flashing. If an
> > > immediate attempt to restart it is performed, the LED goes solid red
for
> a
> > > few seconds and then begins flashing again (no high voltage is heard
> > coming
> > > up). The set must be unplugged and then it will restart before
beginning
> > > this pattern again. I did remove all boards and found numerous bad
> solder
> > > connections including the daughter boards. I also replaced capacitors
> > C840,
> > > C842, C853, and C856 in the power supply. Since it is a hard shutdown,
I
> > am
> > > suspecting the flyback or high voltage block. Can anyone more familiar
> > with
> > > these give me their advice and also a service manual might be helpful
as
> > > well? Also, can someone give the correct part numbers for the flyback
> and
> > > H/V block? Here are the markings from the components inside the set:
> > >
> > > Flyback - TFB3078AD
> > >
> > > H/V Block - TPA5007
> > >
> > > Tritronics shows the H/V Block as a "capacitor block" with part number
> > > 24082877. They show the flyback as a TFB3078ZD (not "AD") with part #
> > > 23236508.
> > >
> > > Bob Waterman, CET® #RI-28
> > > Master Technician License #9109
> > > Service Manager / Parts Manager
> > > Gemini Computer, TV, & Security Alarms
> > > (508)695-7302
> > > (508)695-7769 FAX
> > > geminitv@xxxxxxxxxxx
> > >
> > >
> >
>
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