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Try navigating the screen using the volume and channel controls. If you still can't get to the left side of the screen then try press the menu button again while on the menu screen to see if it'll navigate you there.
Hope this helps :)
There are only two things that can cause this problem -inverter and T-con. Since you have already replaced the inverter, it can be nothing other than the T-CON or LCD controller. Replacing the same should resolve the problem. On a side note the inverter/T-Con problem can be isolated easily. The purpose of the inverter is only to light up the backlight of the panel. So when it fails you will still have a faint picture that can be seen if you flash a flashlight on the screen. If you would like me to find you the replacement T-con let me know the part number and I will get you the link to the part.
On all the plasma tvs there are control boards on the lower part of the screen that control the vertical images. If one of the chips on one of the boards fail, have a bad connection, or no ground it will result in a thick black line down the screen.
IF YOU HAVE A SOLID BLACK LINE RUNNING VERTICALLY THEN YOU HAVE A FAULTY MATRIX INVERTER. IF CENTRAL THE MAIN VERTICAL INVERTER NEEDS CHANGED. LEFT = LEFT VERTICAL INVERTER RIGHT=RIGHT.........
ANOTHER WAY TO GET THIS FAULT IS WORN OR DAMAGED RIBBON/PLASTIC GOING FROM THE SCREEN MATRIX TO THE INVERTER Good luck and take care in handling it ........
This sounds like a problem with the power supply. Usually capacitors on the power supply board tend to dome, bulge or dry up. The damaged ones can be seen on the power supply circuit board when the back is removed. The dry ones have to be removed and tested. The caps can be replaced at a repair shop for around $200, but if the power supply board has to be replaced it can cost a little more. It all depends on the shops repair fees.