Vertical lines appears on screen 50PUS7303/12

Sorry, if I can't describe enough.. Pictures show what the problem is.

TV is Philips 50pus7303/12.

Firstly picture disappeared and screen goes black. (my son told me that while playing picture disappeared) I see that back light was working. I try to restart by remote control but nothing. I unplugged from socket for about hour and try to start it, again Black screen. Again I unplugged from socket for 24 hours. After switching on, appears vertical lines. No pictures and sound. For my luck, that happened 3 months after warranty expired…..

Can that be caused by flat ribbon cables from board to panel?

Or what is the reason?

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Probably don't know how to upload images..

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