[TechAssist] Re: Toshiba27", TAC8949 chassis, model CX29679, weird problems.FIXED (I think)
- From: Kevin <kevintv@xxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Wed, 23 Jul 2003 01:18:48 -0700
I had this TV misdiagnosed from the start! I found a bad connection on
Q181 which supplies 13.9 volts to other circuits, probably the uP. This
transistor is found in the horizontal section but is part of the power
supply. So far on test it is working fine--it is very possible this one
bad connection had caused all my various symptoms that made it look like
it was the microprocessor. Oh well, live and learn.
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 Kevin
Sent: Tuesday, July 22, 2003 10:27 PM
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] Re: Toshiba 27", TAC8949 chassis, model CX29679,
weird problems
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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