[TechAssist] Re: Panasonic CT32G5B Squealing power supply
- From: "Leonard G. Caillouet" <lcaillo@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Fri, 2 May 2003 13:48:20 -0400
The only thing that I found on the Panasonic site was a tip for high pitched
squeal on another model with the same chassis (NA6). Check C565.
Leonard G. Caillouet
Service Manager
Electronics World
Gainesville, FL
352-332-5608
352-332-5668 (fax)
----- Original Message -----
From: <MDileo0000@xxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, May 02, 2003 10:21 AM
Subject: [TechAssist] Panasonic CT32G5B Squealing power supply
>
> Panasonic CT32G5B, ABP331 chassis.
> This set came in with a shorted avalanche diode D525, damaged power
> regulator IC803 (STR58041) and open resister R828 (47@3wt). It squeals as
if
> there is a secondary short. Scoping the regulator circuit shows good
initial
> peak-to-peak ringing that dies off as if the circuit is starving from
> insufficient current. I would like to know if anyone has a method to run
this
> circuit fully decoupled from the chassis? I already tried disconnecting
all
> of the secondary loads and using a 50 watt lightbulb as a dummy load for
the
> 130 volt supply. I have a factory manual and it lists the regulator as
being
> a STR58041A but there was a STR58041 installed as original factory and it
has
> better operating specs than does the "A" version. Any ideas or past
> experiences appreciated.
>
> Dominic DiLeo
> Atlantic TV
> Freeport, Maine
>
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