HI have a question, what those TV backlight LED lens (optical convex lens? ) are called. If they fall, how can we glue it back? Hot glue gun or super glue?
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Last edited by capwizard; 02-01-2019, 09:54 AM. -
Re: optical convex lens?
not hot glue or superglue - the leds get hot.
maybe clear silicone. (neutral cure type)
search on ebay for a chinese product called 705 "705 silicone"
https://www.ebay.co.uk/itm/302814126123 -
Re: optical convex lens?
how long is too long?
that stuff is reasonably fast.Comment
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Re: optical convex lens?
It has to be flexible (silicone rubber) because of the temperature swings. Hard epoxy just cracks.
24hr cure for a big blob or thick run, and 1hr for thin films. It's the thickness that mainly affects cure time. Humidity and airflow, temperature also play a part.
I leave the stuff overnight, or several hours upright at least if the lens is heavy.Comment
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Re: optical convex lens?
Can I use 10 seconds UV glue for promptness?Comment
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Re: optical convex lens?
you can try.
but first, harden some on a bit of tape or card, then bend it
if it cracks it wont work, if it bends then it might.
it also has to be heat-proof.Comment
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Re: optical convex lens?
Shopjimmy used super glue!
How to Replace Single LEDs for an LED TV - ShopJimmy LED Strip Rework Station Tutorial
https://www.youtube.com/watch?v=EZVQKEp6jxk
this guy used UV glue
LG Led TV 32LN5700 No picture :backlight Repair,change Smd Led without hot air! easy way !!
https://www.youtube.com/watch?v=YrZ4bAFiUg8
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Top 5 High Temperature Resistant Adhesives - Master Bond
https://www.masterbond.com/enews/top...adhesives.htmlComment
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Re: optical convex lens?
shopjimmy are fucking assholes!
the heat from the led will cause the cyanocrylate to soften and evaporate - then the vapor will form a stinky foggy powdery coating on everything!!!Comment
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Re: optical convex lens?
454,990 viewers from shopjimmy might be fix led lens using superglue which vapors are very irritating. UV glue or UV silicone glue would be a better way.Last edited by capwizard; 02-01-2019, 10:34 PM.Comment
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Re: optical convex lens?
A....three crops of UV glue.
B....UV light for 10 seconds.
C....it is ready.
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I know many folks on this forum warn against conductive glue and suggest removing it immediately upon site. I'm here to vouch and say these people know what they are talking about. To be more accurate, the glue isn't intended to be and doesn't actually start out conductive. It gets conductive as it is heated by components that get hot. The glue starts out to be a light tan color but as it is exposed to heat, it gets darker and darker until it is a dark brown. I have found that it becomes conductive at the point that it reaches a light brown color on darker.
Here is an experience I... -
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Hi guys,
This is my own (actually present to gf) amp which I am not even using so much.
Recently started to use optical input from TV which worked great.
However recently the link went down.
Few days ago I opened it up, cleaned PCBs from dust, then came back to life.
But today it did the same thing again.
On TV when I change setting from speakers to just optical and other way around, audio comes up only for very short moment.
There are 2 optical inputs, both behave same way.
I found schematic which is attached.
I hope this forum experts... -
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