[TechAssist] Panasonic CT32G5B Squealing power supply
- From: MDileo0000@xxxxxxx
- To: techassist@xxxxxxxxxxxxx
- Date: Fri, 2 May 2003 10:21:38 EDT
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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