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Old 09-13-2017, 08:45 AM   #4
Badcaps Veteran
Join Date: Jun 2014
City & State: Overijssel
My Country: The Netherlands
Line Voltage: 230V
I'm a: Professional Tech
Posts: 1,906
Default Re: Panasonic Viera TH-42PX75U with 7 Blinks

Ok so the powersupply works , thats good. 195V is good.

If the tv does not run without the buffers then there is a good chance the sc board is faulty. Especially with the long beep you are measuring.
There are some parts on that SC board that are soldered ( and screwed ) to the heatsinks.
They are labeled with "Q" and the parts are mosfets. Measure those components continuity/diode mode. Put the propes on the outer legs. Beep is bad.
If you find 1 or 2 ( usually more ) of these then your sc board is bad.

I cant find the part number on the board , its probably hidden under the buffer boards.
Google that part number with repair kit. "TNPA56... repair kit" and see if you find the components that are usually short on this board so you can measure them.
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