[TechAssist] Re: Fw: Re: Toshiba CF3566A (Tac9190)Blows Audio Output I.C.?
- From: "Bruce Tiedeman" <btied@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Sat, 22 Jan 2005 09:55:47 -0500
Thanks Guys, I have double checked all my connectors to make sure they are
in the proper socket and not backwards. I have found some bad solder
connections where the AV board plugs to the main chassis. On "my print', it
looks like the signal is switched from "internal to external only", at the
switch. I can not see where the signal for audio goes through the AV board
(PB1670-1). I have checked for a problem on the audio line to the switch in
both positions . Yes when the audio I.C blows it takes out the diodes as you
suggested. When they are replaced with a new audio I.C all is good with
audio switch in external position. I have left the switch in external after
the repair it does not matter still blows. I will solder board connects at
AV board and take it from there, trying not to blow my last I.C.
thanks for your help,
Bruce.
----- Original Message -----
From: "jonas miglinas" <miglinasj@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, January 21, 2005 11:40 PM
Subject: [TechAssist] Re: Fw: Re: Toshiba CF3566A (Tac9190)Blows Audio
Output I.C.?
> Ditto Tony,
>
> I remember having the same trouble some two years ago with a Toshiba
blowing
> the audio ic and diodes after having repaired a dead set symptom.
> I inadvertently put a plug in the wrong socket (these were not labeled)
> either on the main board near the audio ic or on the video board where the
> speaker switch is located. Two of the sockets had the same number of pins
as
> the plug. Blew four ic's and a number of diodes before I got the schematic
> and found out what I had done.
> Been looking for that schematic, can't seem to find it. More than likely
> loaned out and forgotten. If I find it, I'll let you know Bruce.
>
> Jonas Miglinas
> Miglinas TV
> Chicago
> ----- Original Message -----
> From: "Tony S" <tcselectronics@xxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Friday, January 21, 2005 9:52 PM
> Subject: [TechAssist] Re: Fw: Re: Toshiba CF3566A (Tac9190)Blows Audio
> Output I.C.?
>
>
> > Bruce , not sure if this helps but I remember replacing several 1N4148
> > diodes under the heat sink of the audio output on several toshibas with
> > blown audio outputs. Usually happens if the customer tried to hook
stereo
> > into the output speaker terminals of the TV.
> >
> > Tony Saracco
> > TCS ELECTRONICS
> > 406 Andra Ct.
> > Gilberts, IL 60136
> > tcselectronics@xxxxxxxxx
> >
> > ----- Original Message -----
> > From: "Bruce Tiedeman" <btied@xxxxxxxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Friday, January 21, 2005 7:03 PM
> > Subject: [TechAssist] Fw: Re: Toshiba CF3566A (Tac9190)Blows Audio
Output
> > I.C.?
> >
> >
> > > Audio Output I.C shorting on internal audio setting only!
> > > I spoke to soon on this set. This chassis is difficult to work on
having
> 3
> > > separate boards that tie together. I removed the chassis and left the
> > > cabinet in customers home. The set has High Voltage and Audio now
,after
> > > the
> > > audio and power supply repair.. If I put the audio switch on back of
> > > chassis
> > > to internal setting it blows the Audio Output I.C immediately. "On
> > > external
> > > Audio it works good audio and all". Is it possible the "speakers have
to
> > > be
> > > hooked up" on this chassis to prevent this problem. I have gone over
the
> > > circuit many times and all voltages check good. ( with external audio
on
> > > only). I am stuck with this problem? Have not seen any thing like this
> > > before, but don't work on many Toshiba sets with this type chassis. I
> have
> > > a
> > > print and followed the audio from main chassis to AV board and back to
> > > main
> > > chassis again, I can not find any part tied to this circuit that would
> > > cause
> > > this.. I have blown a few of these audio I.C's ,it is getting costly.
> > > any help on this appreciated,
> > > Bruce.
> > >
> > > B&T Electronics
> > > 139 Margaret St
> > > Sarnia Ontario
> > > Canada
> > > N7T 2Y3
> > > 519 344 1850
> > >
> > >
> > >
> > >
> > >
> > > Subject: Re: [TechAssist] Re: Toshiba CF3566A (Tac9190) No Start Relay
> > > click
> > > only!
> > >
> > >
> > >> Fixed! Thanks for the help , found a bad cap (C651) at the audio
> > >> output I.C, it was leaking causing the output and diodes to short in
> that
> > >> section. .
> > >> I also repaired the power supply.
> > >> Bruce.
> > >
> > >
> > >
> > >
> >
>
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