You're discussing about the 'supply HUM' I assumes. Check all the external connection to TV inputs for firmness first. If all are found OK, check by replacing all the filter capacitors at its main power supply regulator board. In fact, replace the power supply board as card basis will be the best. For more information go to http://electronicshelponline.blogspot.com/
Unfortunately not. The serial number is only on the television or the box it came in. If you have not written it on your manual there is no other record of it.
3.3V SOS D board has the trouble. If you wish to get more details about the blinking codes to Panasonic Plasma TVs, check this link. http://electronicshelponline.blogspot.com/ Pull up previous posts there, either by its left side bar, or, see it in 'Timeslide' option.
Replacing and configuring a main power board to a Plasma display is not a simple job as you thinks. With only a multimeter, you can't do anything. It is a skilled work. Contact any experienced service technician. If you wish to get more details about the repair process of plasma displays, check this link. If you are not familiar with electronics, do not attempt to
repair.Whether you sufferfatal electrical shock!
Instead, contact the nearest service center.
