jvc LT-26C31BJEJVC lcd tv

[swainy]

hi guys i have one of these now all of a sudden the picture will go and i will get lines down the screen after a few minutes the screen will fade out and go black.

Now i have taken the back off it to clean the inverter board no difference tho where i plug in my 360 hd leads there is a boeard behind that with like a heat sheild or case around it if i tap it by there the screen will come back on perfect again any ideas why it is doing this.....

Thanks in advance...