LG 47LN5700 LED light patches

[anupkg1985]

Hi,
I picked up a LG LED tv which had no video. Actually it was backlight issue, I replaced 3 bad LED and all strings started glowing again. However after putting all things back I could see bright patches from LED on the screen. How to fix this? Is this issue with the LED itself or something else? Any pointers would be appropriated.

[mmartell]

Re: LG 47LN5700 LED light patches

Looks like the led lenses are falling off or misaligned.

[anupkg1985]

Re: LG 47LN5700 LED light patches

Can this be fixed? I used super glue to stick the lenses not sure if this can be removed and fixed again.

[neilc6]

Re: LG 47LN5700 LED light patches

New LED strips are relatively inexpensive and you are likely to have a repeat failure if you don't replace them with new. Bright spots can be caused by misaligned lenses or the lenses sitting too close to the sheets. I would confirm all the standoffs are in place. They also tend to bend near the tip. Also confirm you put the diffuser sheets back in the correct order. When doing backlight replacements, I always check the backlight before reassembly. The TV will turn on with the panel disconnected. You can check for bright spots, dust and dirt with the diffuser sheets in place.

[diif]

Re: LG 47LN5700 LED light patches

The cyanoacrylate fumes cloud the lenses, don't use super glue to stick them on.
Use UV glue like 5 second fix.

[dick_barton]

Re: LG 47LN5700 LED light patches

How many lenses did you fix with superglue because that's a lot of bright spots.

You haven't replaced the panel filters incorrectly?

[Diah]

Re: LG 47LN5700 LED light patches

How many lenses did you fix with superglue because that's a lot of bright spots.

You haven't replaced the panel filters incorrectly?

+1
look out the first thick plate surface not correct.. the smooth surface should always to the top

[anupkg1985]

Re: LG 47LN5700 LED light patches

Replaced LED strips from another set and all looks good now. Thanks everyone for your help 🙏.