Re: 55 inch Plasma Viera (VIERA TC-P55GT30) not turning on. 7 blinking red lights.

I have panasonic p55st30 plasma 7 blinks of death, I sent out all three boards, SC, SD, SU out to be refurbished, got all parts back, put them back in and tv came on but had black lines. I understand plugged and tried reseating ribbons what seemed to be a hundred times. I unplugged set each time I adjusted ribbons. Now I have 7 blinks again. Could it just be the ribbons or are boards shot again?