I made exactly the same mistake this year. I thought it was an assembly error, so I disassembled and assembled the set 3 times. Now everything makes sense, thanks Mike!

@michaeldranfield7140

8 ай бұрын

Others comment that you should not touch these sheets at all, of if you do with lint free dry gloves .

Wow - I never knew that! I once cleaned a CRT monitor screen with a proper monitor screen cleaner which took all the A/R coating off! I got compensation from the screen cleaner manufacturer for that one!

@michaeldranfield7140

8 ай бұрын

me neither but I have noticed sets left in the rain seemed to have a stain in the screen but always put this down to condensation until a friend brought this to my attention.

Well...... I've genuinely learnt something new today! I have a set where someone has left fingerprints on the inside of the screen pack? sandwich? whatever you might call them. I had it in mind to try cleaning them - but not anymore!

@michaeldranfield7140

8 ай бұрын

if you have a fingerprint behind the glass someone has already had it out to replace the backlights , I would think a dry non abrasive cloth would be ok , I know the back of the LCD panel is coated with a plastic sheet and I have cleaned one of these without any ill effect .

I have had this problem before with a set that was left outside in the rain, it only affects the one layer. No idea what the coating is, but any liquid destroys it, luckily I had a larger scrap set, just cut down the plastic layer with a pair of scissors & the set was fixed 😁

@michaeldranfield7140

8 ай бұрын

seems right and I have noticed the longer its exposed to a liquid the more the coating disappears.

Reminds me a bit of when I worked as a teenager back in the 90s assembling battery operated Miners Lamps. I remember that you could not touch the reflector unit with your bare fingers as the sweat/moisture would distort the reflective coating thus ruining it.

@michaeldranfield7140

8 ай бұрын

Im guessing you were advised then not to touch the reflector but with LCD TV I have never seen it mentioned in any service manuals not to touch these parts.

Thanks for sharing 🙏🏻 super advice

@michaeldranfield7140

8 ай бұрын

No problem , every day is a learning curve .

Hi Michael. I have a Hitachi 50HK6100UB tv only a couple of years old not much use that suddenly the screen disappeared. Sound still works. There’s a thin horizontal strip across the top you can see when Netflix boots up then after a few minutes there white cloud blobs appearing and the screen slowly goes a bluey white. I’ve since bought a replacement tv but would be good to get use out of it rather than going to a landfill. Any tips or thoughts please?

I remember cleaning the glass tuning scale in an old valve radio with soapy water - imagine my horror when it took all the printing off!

@michaeldranfield7140

8 ай бұрын

Yes , did that once on a vintage radio once , never again , now if the glass is dirty I just leave it like that .

Thank you for sharing this interesting and educational video. I guess it's yet another example of the "throw away" society with a special surface that can't be cleaned. Just out of interest how much roughly are the special coated sheets to buy new?

@michaeldranfield7140

8 ай бұрын

For some manufactures like samsung and vestel these parts are available from £12-£25 each but the cost of delivery on top makes this not economical

Flints at shirebrook, do great repirs, and John Hamilton at Sutton, great video

Useful to know that, thanks.

@electronicengineer

9 ай бұрын

Same here. I had absolutely no idea that just plain rainwater would damage the plastic sheets employed in these TV screens. The more you know, I guess...

@michaeldranfield7140

8 ай бұрын

seems to be more to these plastic sheets than it looks .

i had a burn up on a 49" sharp which put a nasty black mark on the top layer but used my old favorite "white vinegar" and it came up good as new (but dont use to much)

@michaeldranfield7140

8 ай бұрын

someone has suggested these sheets may only be coated on one side so its possible you could clean one side without any problem , it needs more investigation .

Youre not even supposed to touch these with your fingers, theyre called a BEF prism sheets, only supposed to use compressed air or just replace them.

@mistermikeanson

8 ай бұрын

Something else I learned today!! Thanks!

@michaeldranfield7140

8 ай бұрын

I need to research this on the net and see what's its all about then , the other day I fitted a new backlight in a Sony set and a white sticker stuck to the back of the screen seems to reference these sheets , not just sure why anyone would need to know this or what it means this but it says . OPT sheet Top > PC,PEN OPT sheet MID >PET OPT sheet BTM >PET LGP >PMMA Reflective sheet >PET

@Synthematix

8 ай бұрын

@@michaeldranfield7140 BEF or (Brightness Enhancement Film) distributes the backlighting to various angles depending on how its fitted, these have a moisture sensitive coating and should only be handled when wearing cotton gloves, the microscopic layer of the top coating is a diffusion layer and its very delicate, you must also never apply any pressure to them as this will damage the magnifying compound, some tvs/monitors have two of these to bounce the light from left to right & up to down. VA panels (Vertical Alignment) TN TFT (Twisted Thin-film Transistor) (these dont use these sheets) its done electronically. IPS (In plane switching) use 2 of them this is why the colour isnt as vivid as a VA or TFT panel. Basically theyre there to help with the limitations of an lcd panels viewing angles apart from TN screens.

Interesting...

@michaeldranfield7140

8 ай бұрын

it is , I need to do some research on the sheets as there is seemingly more to them that meets the eye .

I never had to try to clean one in the process of replacing LEDs, but now I'll make it a point not to. I do try to use latex or nitrile gloves if I have to handle them I'd hate for my fingerprints to show up on one of those police shows.🤣 All good info to know !

@michaeldranfield7140

8 ай бұрын

don't know if its just me or not but I always seem to end up with a speck of dust or something behind the screen and I have to take it out again !

IPA (alcohol) works a treat got rid of many a water mark with it and I WHITE kitchen roll, does take time but it works

Every day is a school day, even the best of us keep learning.

@michaeldranfield7140

8 ай бұрын

it is , for both of us !

Hi @michaeldranfield7140, I wanted to ask a question... I watched your video on the boot loop problem with Samsung TVs where you froze the chip. I want to give this a go as I have the exact same problem but I can't see how to download the software I need for the chip...any ideas?

@michaeldranfield7140

8 ай бұрын

you have to go to the samsung website and download the correct version for your set to a USB stick , then follow the instructions on the website .

Was the on an outward facing piece? I'm curious if its the anti-glare coating that you were removing

@michaeldranfield7140

8 ай бұрын

I cant remember now but I will have a look at another in the future .

That's saved future trouble thanks for that, I would have guessed water would be just fine, now i wonder what trusty old "sorts everything" ipa would do!

@mistermikeanson

8 ай бұрын

ipa would wreck it for sure!!

@michaeldranfield7140

8 ай бұрын

I think this could well damage the surface but the only way to find out would be practice first on some scrap sets .

ho avuto lo stesso problema li ho recuperati da una tv con pannello rotto mi dici che programma usi per copiare i file da una tv tramite usb

When I wipe my layers I just spray a microfiber cloth for glasses and such from a distance with windows cleaner spray. Enough to be moist so the dust will stick to the cloth.

@michaeldranfield7140

8 ай бұрын

think I will just stick with a dry cloth when dealing with customers sets .

Are these diffuser and optical sheets available from the manufactures?

@michaeldranfield7140

8 ай бұрын

Yes they are for some samsung models where LED burn up is common but at something like £12-£25 a sheet and then delivery on top it makes the job not economical .

Wonder what would be the result with isopropyl if it did that with water ?

@electronicengineer

9 ай бұрын

My unsolicited opinion wants to reach out to you and say: If you do end up trying isopropyl alcohol, make absolutely certain that the isopropyl alcohol you end up using is 99.9% "anhydrous" (sans water), as the typical, bog standard, usually found for sale in the drugstore, isopropyl alcohol is normally comprised of only around 60% isopropyl alcohol and contains approximately 40% water in it. Since Michael showed us what straight up rainwater will do, I would avoid using any liquid that contains any amount of water, no matter how small of a percentage that may be! It really occurs to me that these LCD televisions' LCD screens are simply just not made to be worked on. Good luck!

@michaelwaite6725

9 ай бұрын

@@electronicengineer just wondered really as most tv engineer's would have isopropyl alcohol in one form or another to hand really. Though i have been involved in tv repair trade it's not something I would consider now new tvs are such a waste of time and effort

Thanks for the advice. I'm guessing these 'may' be fairly easy to get hold of 2nd hand, as there are lots of TVs out there with broken screens but these filters must still be in tact.

@michaeldranfield7140

8 ай бұрын

very easy to get hold of , I take stuff like this to the tip all the time but one that's been stood outside wont be any good .

Can you imagine how little these things cost to produce?

Hi Michael Been trying to contact you direct i can find a way

I have made that exact mistake some years back lol

@michaeldranfield7140

8 ай бұрын

one to remember now .

If you are like me,who cant remember their own name,and you want to mark them so you know on what order the will be reassembled,use some masking tape and grab them all together.ofc no filthy hands,otherwise you are gonna smudge them.

@michaeldranfield7140

8 ай бұрын

Yes, I remove these all in one go so there is no mistaking the way they go back in .