I have a LG 47LN5400 TV with a screen problem. I repaired the back light as there were burnt out LEDs, so that problem is fixed.
The back lights turn on, and I can cycle the menus, but the menus show up almost solid black boxes and any text on the screen is backwards in a mirrored fashion.
The LCD is also very dim even with the back lights turned on.
Is the plastic what I call "diffuser" which spreads the light evenly some sort of polarization filter which if I installed backwards would cause such a thing?
I have changed the main board, power supply, tried 3 different tcoms, and even swapped out a majority of the cables + ribbons yet the problem still persists.
I can only imagine that the LCD boards are broken, or the white plastic is inverting the image.
The menus are also almost impossible to see so I can't reset the picture settings, but I'd assume after the mainboard swap it would be using different settings.
Any suggestions?
Thanks
Edit:: Just now discovered that while playing through the menus one of the menu buttons causes the screen to go a lighter shade of grey and produce moving scan line like bars moving top to bottom, then it goes back to a dark screen with snow static.
Edit:: When removing one ribbon to the LCD it produces half a screen of pure white, and the other half black with rainbow colored vertical lines. When unplugging the other one, I get a black screen with a lighter black rectangle in the middle going vertical. Menus did not work with either cable unplugged.
The back lights turn on, and I can cycle the menus, but the menus show up almost solid black boxes and any text on the screen is backwards in a mirrored fashion.
The LCD is also very dim even with the back lights turned on.
Is the plastic what I call "diffuser" which spreads the light evenly some sort of polarization filter which if I installed backwards would cause such a thing?
I have changed the main board, power supply, tried 3 different tcoms, and even swapped out a majority of the cables + ribbons yet the problem still persists.
I can only imagine that the LCD boards are broken, or the white plastic is inverting the image.
The menus are also almost impossible to see so I can't reset the picture settings, but I'd assume after the mainboard swap it would be using different settings.
Any suggestions?
Thanks
Edit:: Just now discovered that while playing through the menus one of the menu buttons causes the screen to go a lighter shade of grey and produce moving scan line like bars moving top to bottom, then it goes back to a dark screen with snow static.
Edit:: When removing one ribbon to the LCD it produces half a screen of pure white, and the other half black with rainbow colored vertical lines. When unplugging the other one, I get a black screen with a lighter black rectangle in the middle going vertical. Menus did not work with either cable unplugged.
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