Wasted my time on breaking down this flat screen TV

Find out if you can sell the flat screen like it is first.

Try selling just the boards on eBay or something, like the boards and the wiring and everything you can, except the screen/plastic.
Most of the time theirs either 2 things wrong with them, the screens broken, or the electronics are fried.
If the electronics are fried, its probably because of a bad capacitor. You can see them quite easy, there's often brown gunk coming out of the capacitor, or the capacitor can is swollen.

Try and find out why its not going.
If then screens broken, that's normally what stopped it working, it will still power up and bring up a broken image on the screen. In that case the electronics are probably still good for sale.

If the screens broken and it does not power up, its probably been broken after it stopped working.

If the screens OK. Check the boards for swollen caps. Then run the TV for a few hours to see if its a heat related fault. Sometimes waving a hairdrier or hot air gun over the board will help figure out where the fault is, a dry solder joint or such. Or a bad mylar connection to the screen.

Document and store you flatscreens if you think you can sell them. You need lots of space before you will get two or more of the same sort.

Plasmas, I have got several of the same sort, with good screens and the same problem. I have found out that they often blow the chips in the board down one side once the bad capacitors have blown. So to get them going its not just a case of replacing the badcaps.
They also have at least 455 screws in them, I counted once... Sometimes the screen backing is Ali.
But the work involved is just mind numbing. Though the power supply's are great.

Neon backlit LCD seem to be out of date these days. The heavy thicker LCD screens. Probably good for escrap and maybe parts, probably not.

LED backlit flat screens, very light and or thin. Current manufacture generation. Good for parts or reconditioning.

I think its best just to get them and find somebody to sell them to at a set price.

badcaps,net (net?-com? Cannot remember right now) is a great forum where you can search for individual flatsceens factory faults and how to fix them, obtain good new Capacitors and general info.

If you can find somebody who is using this info to recondition flat screens, you have a 'guy who buys' your escrap.

The other option that happens, is that somebody will get hundreds of flat screens, tape them 'face to face' and fill a shipping container with them and send it to China, where they can obtain brand new screens and fix even the broken screen.

Learn to love a cracked screen. Most of the tv's with a cracked screen work. If you are going to ebay the parts be certain everything works. Do your research on ebay to be certain if there is a market for the particular model you have.

Know your shipping costs to the furthermost destination likely to have ship to. I live on the east coast and west of the Mississippi can jack shipping up. You do not have to be the cheapest. Know how to pack re-usable parts, the tv repair guys know and will remember if you did not do a good job.

My thoughts on returns is "sh*t happens" so most times I refund without requiring return. Why? Because as the seller I have to pay for return shipping. Most tv parts aren't worth returning just because the cost of the return shipping. In addition what will you test the suspect part on??

Get educated by watching youtube videos and be prepared to make a mistake or two along the way. 73, Mike

I have been trying to figure out the LED light bars, the long flat plastic strip with the LED dots on them.

First I figured that as a full panel, just the LED glass screen removed, they might make a good light panel for illumination at home or a workshop/garage.
However there's work to be done on them as they still think the screens running and will flicker with intensity as they think the screens darker at certain points of time and a way to get a darker screen, or a deeper darker colour is to reduce the background light.
Also they might have a timer and turn off after a while. Or down.

So I figured why not just use the power supply for the LED and run it like that, or another power supply.
Thinking that there's other uses in other places and they could be used as light stops in cars/RV/ sheds, cupboards etc etc. So I run the lights and check the voltage with a multimeter and find outs running at about 47volts, maybe 48.

There seems to be a burgeoning hydroponics growing market and I wondered of they would be any good for that use too. Since they should be a lot loot (sic) cheaper to run, and colder, than bulbs.

48 volts is a bit odd, common in solar panel setups and invertors. But uncommon in power supplys.
Neat if 4 car batterys are involved, but then.. LEDs are funny, if they need 48 volts, give them 45 volts and you will not get much light, give them 50 volts and they will go bright, start heating up, turn red and go 'pop' and never work again.
They need a good stable power supply, and adding more LEDs to a setup changes the setup.
There's no point in connecting up 4 x 12volt computer power supplys together either.
I think you need a good stable power supply that can way outdo what the LEDs need, and a separate regulator to supply the LED strips.
Maybe separate regulators for say each set of 4-6 strips of 6-8 LEDs.

Something so you can wind it up and pop a few LEDs to find the max and then replace the broken strip. (Or maybe they are made for different voltages, even slightly, like not to a set standard like 110volt bulbs are?)
Maybe separate regulators for say each set of 4-6 ships of 6-8 LEDs.

[After edit]

Has anybody got a good use for the plastic sheets? LoL

I have seen a few pinter power supplies that run 30 + volts. Mike