[TechAssist] Re: Fw: CTC203 - loud fast chirping noise (long)
- From: "tvservice" <tvservice@xxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Tue, 11 Jan 2005 15:45:28 -0600
startup resistor for switching transistor in power supply
don't have scem handy to give ref #
Robert
tvservice@xxxxxxxxxxxxx
H & H Electronics Inc
----- Original Message -----
From: "Mark Goldspiel" <southdade@xxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Tuesday, January 11, 2005 12:05 AM
Subject: [TechAssist] Re: Fw: CTC203 - loud fast chirping noise (long)
>
> -----Original Message-----
> From: Ronnie Alston <raalston@xxxxxxxxxxxx>
> Sent: Jul 20, 2004 10:16 AM
> To: "\"Tech Assist\"" <techassist@xxxxxxxxxxxxx>
> Subject: [TechAssist] Fw: CTC203 - loud fast chirping noise (long)
>
> Dan,
> This may not be your problem but I have found this before.
> No pic/snd chirps at plug in: q14104 leaky E-B, switching transistor
for
> 12 v regulator ic u14104.
> Also, check q14105 and u14104, if bad they can cause the same problem.
> Q14105 is turned on by micro at turn on to turn 12v reg on. If 12v supply
> doesn't come on when set is innitially plugged into power source the micro
> won't even try to turn on the set.
> Hope this helps,
> Ronnie Alston
> Alston's TV Service
> 110 North Third Street
> Ozark, Ark, 72949
> raalston@xxxxxxxxxxxx
>
> ----- Original Message -----
> From: "Dan Garris" <dgarris@xxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Tuesday, July 20, 2004 9:00 AM
> Subject: [TechAssist] CTC203 - loud fast chirping noise (long)
>
>
> > Sorry, I typed the wrong chassis # in the previous subject post. It is a
> > CTC203 CH3 Chassis.
> >
> >
> > Hi Fellow Techs, (tough dog so it's long)
> >
> > 32" RCA TV Model F32665
> > Chassis: CTC203CH3
> >
> > I have a Common CTC203CH3 32" RCA Chassis here with a loud super fast
> > chirping noise! (not a tick tick, squeal or a buzz, but a super fast
> > consistant repeative chirping noise as soon as you plug it in AC,
constant
> > continous hi-speed chirping like at a rate of 20 chirps a sec - werid to
> > describe but you get the idea - just not the normal tic tic or squeal)
> Fuse
> > ok, 2SC5148 Hot is OK, Flyback ok, voltage reg ok, Q14104 is good out of
> > circuit, no cracks in PCB, all solder is good, L14401 coil is good,
> > unplugged the Gemstar, what have I missed... Anyone seen this one?
> >
> > It's not the high pitched squeal you normally hear when the HOT is
> shorted.
> > (I double-checked the HOT out of circuit and it is Good!) I replaced the
> > flyback with new one and voltage regulator and checked all the common
> diodes
> > and the common L401 L101 coils (forget the exact part location #'s) even
> > took the two small coils out of circuit and double-checked them both and
> > both are good and have good connections. I've looked it over and
> troubleshot
> > it for 4 hours and looked thru all my Servicesoftware tips, ESD tips,
> > Intrepid tips (there are a lot for the CTC203) Dead - Loud fast chirping
> > noise. However let me describe the noise (super fast chirping) on this
set
> > because it is not the normal squeal I commonly hear with a shorted HOT.
It
> > is a chirping noise - Only very very fast(like 20chirps or more per
second
> > to help best describe) I wish I could play a .wav of it to all you
fellow
> > techs but anyhow I am stumped and wanted to ask for any comments from
> > anyone. I am not charging customer for repair because it happens to be
> > someone in the family so wouldn't you know it, it would be the tough
dog!
> > LOL
> >
> > Dan Garris
> > Garris TV
> > New Bern, NC 28560
> > dgarris@xxxxxxxxxxx
> > (252) 638-4477
> >
> >
> >
>
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