philips 50pfp5532d

[yamada]

Hi all need help in sorting out a philips 50pfp5532d that was giving to me by a friend as it would not swich on just had clicking relays when back was removed there was a few bulging caps on psu which is known fault with these tv's all was replaced and tv was back to live all works ok apart from the picture look's grainny on all inputs  bit like connection thru a Composite input i am new to plasma tv but could this be caused from the LJ41-05400A (Tcon board ) any advice would be helpful thanks