Chosen Solution
A few weeks ago I completely tore down an LED TV that needed an LED strip replaced (TV would flicker then go out on powering up). Did that, put it all back together, screen lights up steady now but there is no picture. I was hoping this TV just had multiple issues that went undiagnosed initially but I have since replaced the T-con and mainboard with known working ones and the “image” didn’t change at all. I already checked and reseated all wires and connectors. The only odd thing I noticed is there’s a connector on the t-con with no available wire to plug in (wasn’t before, either) and no open ports on corresponding boards that it could conceivably connect to…maybe it’s just generic and doesn’t apply to this model…struck me as odd nonetheless. Is is possible the plastic under the LCD is just not in the right order? Would that cause literally no image to come through? I wasn’t positive which order the plastic sheets go in (when I removed them I kept them in the right order but orientation may be off…or I flip flopped top and bottom). I assume the thick plastic goes first and rests on the plastic pegs – then the thin sheets on top of that. The thin sheets seemed to only be able to go in one way – ie if you rotated 180 degrees the slots wouldn’t line up…but it wouldn’t be a stretch to say I made the top sheet the bottom and the bottom one the top. Since a total stripdown is a dangerous/delicate process I dont want to bother if it’s not even remotely possible that changing the order would fix the display.
@merkman those are diffuser sheets and have only to do with the way the light/picture looks. Unless of course you have by any chance reversed the polarizer it may be possible (highly unlikely) that you only have a white picture. Try to look at it with some polarized sunglasses and see if you can make out a picture. That would answer the sheet question. You should still see more than just the backlight. You need to let us know what exact model this is. Let us know if you have sound coming from your TV when you have a channel that you know is showing. Also, check the power board and see if the signals etc. make it to the main board. Post some images of all of your boarsd etc. with your question. That way we can see what you see, Use this guide Adding images to an existing question Update (07/29/2018) currently working on this LC470DUE-SFR1-LG.pdf. Just out of curiosity, have you flipped the sheets. Mark them with a felt marker etc. before doing so.
