[TechAssist] Re: Toshiba27", TAC8949 chassis, model CX29679, weird problems
- From: Kevin <kevintv@xxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Tue, 22 Jul 2003 22:27:12 -0700
I finally got the microprocessor for this set, but now the set comes on
with no picture or sound--only a low buzzing noise on video 1 and 2. I
believe this was one of the many symptoms that I had before I ordered
the uP. I replaced the new uP with the old one with the same symptoms.
Does anyone have the schematic for this beast? I am trying to locate
the data lines to the uP. Thanks. =20
Kevin Wilks
Kevin's TV & Video Repair
Penticton BC Canada
kevintv@xxxxxxx=20
=20
-----Original Message-----
From: techassist-bounce@xxxxxxxxxxxxx
[mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Gemini Computer &
TV
Sent: Wednesday, June 25, 2003 4:39 AM
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] Re: Toshiba 27", TAC8949 chassis, model CX29679,
weird problems
I do not have a datasheet but that micro was a very common failure
(TMP47C634N2454). It was Toshiba part number 23318860 but is now
replaced by
23300357.
Bob Waterman, CET=AE #RI-28
Master Technician License #9109
Service Manager / Parts Manager
Gemini Computer, TV, & Security Alarms
(508)695-7302
(508)695-7769 FAX
geminitv@xxxxxxxxxxxxxxxx
geminitv@xxxxxxx
www.geminicomputertvsecurityalarms.com
----- Original Message -----=20
From: "Kevin" <kevintv@xxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Tuesday, June 24, 2003 11:05 PM
Subject: [TechAssist] Re: Toshiba 27", TAC8949 chassis, model CX29679,
weird
problems
> Does anyone have the datasheet for the microprocessor for this Toshiba
> TV? The number of the micro is 47C634N2454. I have looked on Google
> and Toshiba's website with no luck. Thanks.
>
> Kevin Wilks
> Kevin's TV & Video Repair
> Penticton BC Canada
> kevintv@xxxxxxx
>
> -----Original Message-----
> From: techassist-bounce@xxxxxxxxxxxxx
> [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of peter kowalik
> Sent: Monday, June 23, 2003 7:53 PM
> To: techassist@xxxxxxxxxxxxx
> Subject: [TechAssist] Re: Toshiba 27", TAC8949 chassis, model CX29679,
> weird problems
>
> Kevin As was mentioned in other replies could be the CPU, could be TAC
> switches and another thing that it could be is bad .01 mfd disc caps
on
> data
> lines to the CPU. Check them for small cracks where the legs of the
cap
> enter the disc. For what they cost it's almost easier and less
expensive
> just to change them on an older unit if you are having CPU type
issues.
> you
> may experience problems with these discs because of age, because of
> corrosion due to liquids which have dropped from the band around the
> tube(
> Windex, milk, pop slobber, etc) or because the disc body has cracks in
> it,
> from moving them out of the way (bend back and forth). These disc are
> humidity sensitive and their properties will change with humidity if
> their
> bodies have lost their integrity (i.e. seal-cracks). Just my little
> offer
> that may help. peter Kowalik pe.kow@xxxxxxxxxxxx Keith's Stereo
> Burl
> ----- Original Message -----
> From: "Kevin" <kevintv@xxxxxxx>
> To: "TECH-ASSIST" <techassist@xxxxxxxxxxxxx>
> Sent: Monday, June 23, 2003 3:27 PM
> Subject: [TechAssist] Toshiba 27", TAC8949 chassis, model CX29679,
weird
> problems
>
>
> > This Toshiba TV will work fine for the first few hours. Then you
> can't
> > change channels or turn it off with the remote or at the set. If
you
> > unplug the TV it may come on when you plug it in, or it might be
dead.
> > If it does come on when you plug it in, it will be without the
picture
> > and if you press the buttons on the remote the picture will flash on
> and
> > off and sometimes stay on. It still won't change channels, though.
I
> > have checked for bad connections and high ESR caps in the power
> supply.
> > Has anybody seen a problem like this before? Thanks.
> >
> > Kevin Wilks
> > Kevin's TV & Video Repair
> > Penticton BC Canada
> > kevintv@xxxxxxx
> >
> >
>
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