Fix Your Stuff Community Store

Repair guides and support for your LG TV.

1345 Questions View all

Options

Screen lights up but no image - already replaced T-Con and Mainboard

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.

Block Image

Block Image

Block Image

Block Image

Block Image

Block Image

Answer this question I have this problem too

Is this a good question?

Yes No
Score 0
Add a comment

1 Answer

Filter by:
Most Helpful Newest Oldest
Most Helpful Answer

Options

@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.

Was this answer helpful?

Yes No
Score 1

10 Comments:

@oldturkey03

Photos added.

I will also say that I noticed rainbow-like reflections in the screen which is another reason why I was wondering if my diffuser panel order was incorrect

by

It remotely could be possible. If nothing else et some polarized glasses and check it out. I am checking for a schematic of the main board.

by

@oldturkey03 didn't look any different with sunglasses on but I'm also not sure if they are polarized. Any luck on the schematic?

by

@merkman what model is your TV? Can you still see the label on the panel itself? What make and model is your panel.

by

@oldturkey03 that was in the photos. The TV is an LG 47LN5200. The panel is an LG Display LC470DUE (photo added as well).

by

Show 5 more comments

Add a comment

Add your answer

Tyler will be eternally grateful.
View Statistics:

Past 24 Hours: 0

Past 7 Days: 1

Past 30 Days: 7

All Time: 1,316