[TechAssist] Re: Panasonic CT32G5B Squealing power supply
- From: "Jim Myers" <jr.myers@xxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Fri, 2 May 2003 11:12:58 -0500
I my experience with Panasonic sets the STR58041 will not work in place of
the original STR58041A. The STR58041A is identified by a white dot after the
STR and does not have the letter A at all. The white dot is where the * is
in this example, STR*58041. The Panasonic P/N is C5HABZZ00062. There is a
very good article in "The Speaker" if you can find it. The article gives the
different resistance readings pin to pin of the two versions and explains
why they are not interchangeable.
**************************************************
Jim Myers
Since 1972
Telrad Electronic Services Co.
Fort Wayne, IN 46815
*************************************************
----- Original Message -----
From: <MDileo0000@xxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, May 02, 2003 9:21 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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