GTV42P4 with LG pdp42P6 boards

[Skinbert39]

Hi Guys!

My plasmas went a bit crazy, it first started very black and gratually warmed up to start removing the black, almost blotches.  I replaced the Power board as I thought it was a power issue, this helped remove the blotches quicker but only slightly quicker. 

Im now thinking  the pwer borad was a waste of money and didnt need replaced. Ive pluged in my tv aerial and the picture is rubbish, the colour is very faint, and can hardly read any of the menu options.  Could this be the main av board?  Im pretty certain its not the XSUS or YSUS boards but at a total loss!

Do i risk a new AV board or is the screen shot? could it just been the gasses are done inside it?

Any help please!

Thanks!