[TechAssist] Re: RCA F36450 ATC113CA1 whining in SMPS (Fixed)
- From: "Jeff F" <jlfonz@xxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 8 Apr 2004 23:15:17 -0500
I finally fixed the whining SMPS transformer on this set. I also determined
that this is the same transformer as the ones in similar chassis. (forgot to
write it down--easily searchable in parts finder--which I don't have here)
I dipped the transformer just like I used to dip NAP yokes. I put hung it
upside down in a can of minwax polyurethane overnight--then hung it to dry
for a couple of days. IT WORKED!!
The bummer---as soon as I turn on the set---there is another whine---from
the yoke (bonded no less)---jeesh. I ran down to the hardware store for a
spray can of the same stuff and soaked it well. Told the customer to let it
dry for a few hours before firing it up again. I/we know that some noise
from the yoke is normal---but this customer was well tuned into the othe
noises coming from the set---so he wanted this one gone also. He may or may
not have heard it after the back was back on but I had to at least go
through the motions to stiffle it-----edith.
TV Doctor
Avalon. Wi
----- Original Message -----
From: "Jeff F" <jlfonz@xxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Thursday, March 25, 2004 1:12 PM
Subject: [TechAssist] RCA F36450 ATC113CA1 whining in SMPS
> This is the second one I've had with this problem. I frankly don't know
what
> happened with the first one (exchanged?). I replaced the smps transformer
> T14101 and timing caps associated with it C14402 C14409 C14410 and the
> obvious siliconing the beads on the diodes in the smps. Sometimes I can
push
> on the smps transformer and get it to stop whining (wish that worked with
my
> wife). Has anyone seen intermittant shorts in the board material itself?
Any
> other suggestions. Had 3 techs (I was the 3rd) try on the first one with
no
> success. TIA
>
> TV Doctor
> Avalon, Wi
>
>
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