Panasonic Plasma tv model TH-37PX50U. Black vertical line about 3 inches wide runs up middle of screen about 1/3 of the way to the top. What is causing this?

SOURCE: single vertical line 1 pixel wide

bad panel call panasonic

SOURCE: Black vertical line 2" wide with a very thin green line

Hi,
The black vertical line is caused by a leaking capacitor, Check and replace poped capacitor with a new won and it will work fine again. No worries.
Thanks for using fixya.

SOURCE: We had a vertical line about 2 inches wide and

It is either the plasma panel itself or a connection problem, either way it will need to get serviced. Suggest you find receipt and phone Panasonic.
Cheers.

SOURCE: Black vertical column

hi all .ive had the same problem,a thick black line down screen.sometimes it flickers from top to bottom and other permantly in view.but i have solved it.forget your ic boards and taking apart tv.have you got either a ps3 or wii connected to tv.if so unplug power lead from socket and relocate in seperate socket.make sure the lead is completely free of any other leads and you might just find this works.i think the power lead creates some sort of frequency that the tv picks up .good luck hope it works

SOURCE: a thin vertical 3 inch black line on the left of

Back light inverters need to be replace.