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To clarify, are the 3 black lines horizontal (left to right across entire width of screen)? or are the 3 black lines vertical (top to bottom across entire height of screen)?
Horizontal lines are almost always the result of a failed panel, and no board replacement will fix the issue.
Vertical lines such as you have described (only 3) are probably also a bad panel. If the black lines were evenly spaced in a repeating pattern, it could be a mainboard or TCONN board.
Has this panel been cracked? or perhaps cleaned recently with too much water or cleaning solvent that has gotten the screen wet?
If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Line, faults & possible causes to LCD screen are given with illustrations. You can get an idea about the fault to an extent.
CHECK THE FUSE ON THE INVERTER BOARD, IFHIS DOESNT IT SOLVE IT REPLACED THE CAPACITORS, IF STILL SAME PROBLEM, THEN YOUR BACKLIGHTS ARE SHOT, HAVE THEM REPLACED
My Hitachi TV Flat screen 42 EDT 4 1A has a one inch black line from the top to the bottom of the
screen on the left side. What or how do I fix it. I did blow it out with a air compressor as suggested by a local repairman.
Sounds like panel is bad or driver ic is bad on the board directly below the black line. Good luck on the repair. Any questions, we can do a chat and go from there. GURU JAY
Your whole problem my freind is dryed up capacitors. You should go, if you have the technical ability to replace these capacitors, to http://servicemanuals.net, download the schematic diagram, and start replacing the waveshaper capacitors in the vertical drive circuit.
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