Samsung LN52a550 Right 1/3 of screen blacked out w/pin colored lines top to bottom w

[714guitarman]

I have a samsung LN52a550 flat panel lcd.The right 1/3rd of screen is blacked out with pin striped colored lines from top to bottom. the lines or not evenly spaced and when you power down the picture goes out before the blacked out screen.. Can anybody help. I replaced the LED control board( the small board at the top center with 2 ribbon cables to panel on top and a computer type cable from bottom of board to signal board) NO CHANGE It was rebult from PTS
THANKS 714guitarman

 

[Edmond]

Hi!

One of the COF flex or COF demux is broken. The circuit is inside of the LCD panel. Dismantling the LCD panel, by removing the metal shields. Try to touch or moving the flex a little. Be careful! The back light is working with 2kV. It's easy to destroy the good COF cables during the dismantling. The COF demux is wary ESD sensitive. Protect yourself and the work area from ESD!