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Old 11-30-2021, 04:12 AM   #9
Join Date: Jul 2017
City & State: Braunschweig
My Country: Germany
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Posts: 57
Default Re: Panasonic TX-P50STW50 Power Supply no 5V (was clicking)

Originally Posted by R_J View Post
The schematic is too blurry (f'n Panasonc) but have you replaced the capacitor (C204?) 47f/35v D205 supplies the vcc voltage by charging this capacitor.
Sometimes the diode in the source pin of Q110 can short causing the wrong voltage back to the CS pin of the ic, The diode is across R207 a 0.5Ω so one end of either the resistor or the diode needs to be unsoldered to check the resistor and also the diode.
Also the capacitors on the +5v line may be weak and need to be replaced.
I had unsoldered the Diode that is in parallel with R207 when i still hadnt found the failed R224 (2.2Ohm). Both seemed okay. I can not completely and 100% rule out that the Diode was reversed when i put it back. I mean I triple checked but in the end its such a tiny part and there are no readable markings on it... But Im 99% sure its correct.

C204 is a new one. Which caps are your referring to by "capacitors on the +5v line"?
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