shut the TV down now no picture but does have sound,

(the lvd was loose when i first took back cover off, so I reattached it, knew it was very odd that it was off so I was thinking it was the t-con board but still not explaining why no backlight , can a faulty cable mess up not having a backlight on the TV?)I have the exact same TV set that you have my problem is the same as yours but I had a green screen on one side perfect picture on the other side then i panic and shut the TV down now no picture but does have sound,

( I disconnected the lvd strips on their t-con board and then put them back on to see if that was the problem) very clueless on what to do, my first time even trying to repair a TV like this. I thank you so much for your Fast Response,sorry I didn't answer sooner, I was combing the web looking for Solutions,it's been over a week now my TV's been out. I don't want to go and buy piece after piece just to go and figure out what it could be, I just need to know what it is so I can figure out a solution then buy the board if need be, could it be the lvd cable? I really hope it's not the LED strips because that is going to be a lot of work :-(

Any help would be more than appreciated thanks in advanced.

Here are other pictures of the boards and wiring

led board i believe, power board

have no idea how to get to the other cables, thanks again oldturkeyfor any assistance.

Hey oldturkey, read your post but didn't have a mutimeter to test what you asked me to, but got one now, really have no idea what to do and what to test but I did notice the lvds cable ribbon connecting to main board is missing some pins could that be causing my main problem with no backlight? But you did say the lvds ribbon cable wouldn't be the cause for the back light not coming on... but the lvds cable was loose when I first opened up the back cover of the tv, can't see anything in this tcon board nor find FP1, blind as a bat in my old age, the printing is so %#*@ small, would you happen to have a picture showing exactly where I should be looking for it and what I should be testing? Or any place I could go and check the schematics for vizio p502ui-b1e please? I really was hoping you would tell me it is the lvds ribbon cable, I have no idea why my TV just out of the blue messed up 5 months out of warranty.. I have a Geek Squad TV from Best Buy a dynex and still going good after 15 years, I take very good care of all my electronics vizio is just $@$*, but when it's working it does have a very beautiful picture.

Thanks again in advance.

Well, awaiting on my order I purchase with a Head Mount Magnifier with light arriving today to make out all the letters and numbers on the tcon/main board, what would be a positive read out that I'm looking for at FP1? Do take into consideration this is my first time messing around with any Electronics like an LCD TV, I'm more proficient with pretty much any form of software engineering, oh and building computers being I have built two within my life Time, thanks for any assistance from anybody out there who could help me with my dilemma.

Thanks in advance