order to put films layers back together on screen

[mattstolte]

Took 47 in lg led smart TV apart to change the Leds and lost order of which way the films go on. There's 2 white prices. Then the silver film then the thick plastic piece. Also my cousin ended up cracking that plastic piece. Is this thing important or can I use something else in its place. I fixed the LEDs just don't know the order to put this back together thanks

[Moreno83]

Re: order to put films layers back together on screen

With a philips LCD i know that the plastic part goes first and then the 2 thin layers , might be different for LED and yes that plastic part is important. If you install it with the cracks in it you will see if on the screen.

[tom66]

Re: order to put films layers back together on screen

The plastic piece is a prism guide plate, it boosts the light output of the panel and makes the light more directional. Without it, the light output will be lower, you will probably see LEDs in the image, and colours may be distorted (depending on the panel.) So you do need that plate there. You will have to source another one.

[mattstolte]

Re: order to put films layers back together on screen

With a philips LCD i know that the plastic part goes first and then the 2 thin layers , might be different for LED and yes that plastic part is important. If you install it with the cracks in it you will see if on the screen.

What about the silver film? Is that last then closer to the screen? Or closer to the LEDs? Also could I use any type of plastic clear?

[tom66]

Re: order to put films layers back together on screen

The plastic is optically clear stuff. So no ordinary stuff. It also gets hot and cannot warp, burn or emit bad smell next to 60C LEDs.

You need to be more careful next time. Take it as a lesson!

[mattstolte]

Re: order to put films layers back together on screen

the plastic is optically clear stuff. So no ordinary stuff. It also gets hot and cannot warp, burn or emit bad smell next to 60c leds.

You need to be more careful next time. Take it as a lesson!

wasnt me. My uncle was down in my shop moving stuff and cracked it, do u know of anything i can use?

[tom66]

Re: order to put films layers back together on screen

You might be able to find something that fits from a similar screen. But there aren't any readily available components as far as I'm aware. I know because I've looked into replacing water damaged films before. I found one supplier in China but they needed original CAD drawings and had a minimum order of 50 sheets. Over $350. Yeah, not happening.

[mattstolte]

Re: order to put films layers back together on screen

I just need the hard plastic piece was wondering if I could another sort of plastic if it was clear and didn't warp

[tom66]

Re: order to put films layers back together on screen

I just need the hard plastic piece was wondering if I could another sort of plastic if it was clear and didn't warp

It has special optical properties and also forms as a mechanical support for some of the BLU layers so I would say no.

[tibimakai]

Re: order to put films layers back together on screen

I wanted to ask this question myself.
Do you think Tom, that these thin layers can be flipped over when you re-install them?
Or they can be installed only in one way(direction)? They are directional(like tires(tyres)?
The two-three thin sheets, are the same, or they are differences between them?

[tom66]

Re: order to put films layers back together on screen

The prism film is directional. The other films are diffusers or guide plates and do not have directional properties.
You can identify the prism film because it is highly reflective on one side and has a kind of scan-line pattern to it.
More info on LCD backlight:
https://www.youtube.com/watch?v=jiejNAUwcQ8