Post The Led Backlights Your Fixing Here.

[SupcoVG64]

Re: Post The Led Backlights Your Fixing Here.

I see a lot of posts where 1 or 2 led's are replaced. Given that the remaining led's are all the same age, and a strip of 100 on a slow boat from China is very inexpensive, would it not be prudent to just change all of them at the same time ?

[Michale32086]

Re: Post The Led Backlights Your Fixing Here.

Hi folks,

I've did a search on the forum but can't find an answer so am posting here as this seems the most suitable place to post.

I've got an LG 42LB5500 LED TV with a backlighting issue - I still get a picture if you shine a torch on it. I've found 4 bad LEDs across multiple strips. My issue is I can't find the parts I need to replace them. I don't know much about TV parts however from research you apparently need to have the exact same parts when replacing. Is this true for LEDs?

The strips I have are:

A Strip: 6916L 1709A
B Strip: 6916L 1710A

I can find ones with similar numbers i.e. 6916L 1709B 6916L 1710B or completely different numbers but for the same TV. Am I able to use any strip that's for my TV model or does it need to be the exact same part? The connectors etc look all the same.

Thanks!

It's been my experience that if the connectors fit and the size fits, you should be OK..

[YoshiK1]

Re: Post The Led Backlights Your Fixing Here.

Hi folks,

I've did a search on the forum but can't find an answer so am posting here as this seems the most suitable place to post.

I've got an LG 42LB5500 LED TV with a backlighting issue - I still get a picture if you shine a torch on it. I've found 4 bad LEDs across multiple strips. My issue is I can't find the parts I need to replace them. I don't know much about TV parts however from research you apparently need to have the exact same parts when replacing. Is this true for LEDs?

The strips I have are:

A Strip: 6916L 1709A
B Strip: 6916L 1710A

I can find ones with similar numbers i.e. 6916L 1709B 6916L 1710B or completely different numbers but for the same TV. Am I able to use any strip that's for my TV model or does it need to be the exact same part? The connectors etc look all the same.

Thanks!

[theojt]

Re: Post The Led Backlights Your Fixing Here.

I have the same, one bad LED.

Did you replace the strip or just the one LED?
Where did you get your part?

Sorry for the delay, I missed your post. I replaced the strip. I got it from eBay https://www.ebay.com/itm/142219238430

$18.

[Michale32086]

Re: Post The Led Backlights Your Fixing Here.

I have to say... Replacing bad LED strips is THE most rewarding repair job I do...

Practically anyone can replace a board. The skill for THAT comes in the diagnosis.....

But to take a 65" or 70" monster, break it down to the bare LED strips, replace the bad ones, and reassemble it all without breaking the panel or ripping the tab bonds?? That requires some real skill and finesse..

I always have a smile on my face when I power up a big LED TV and see it working perfectly..

Of course, they can hear me yell all the way to Timbuktu when I crack a panel or rip a tab bond. hehe

But yea.. Successfully replacing LED strips is, by far, the most rewarding..

[Michale32086]

Re: Post The Led Backlights Your Fixing Here.

I probably fix about 5-8 of these a month..

It used to be exclusively LGs, but lately I have been seeing a lot of Vizios..

I just got a 65" LED in that I am going to tackle this week.. I hate working on LEDs on such a big panel...

[Foxmorg]

Re: Post The Led Backlights Your Fixing Here.

RCA LED55C55R120Q - One bad LED

I have the same, one bad LED.

Did you replace the strip or just the one LED?
Where did you get your part?

[theojt]

Re: Post The Led Backlights Your Fixing Here.

RCA LED55C55R120Q - One bad LED

[johnboy1313]

Re: Post The Led Backlights Your Fixing Here.

If the T-con is the same, you should be able to swap screens.

[bcgrafx]

Re: Post The Led Backlights Your Fixing Here.

My last repair is a 42LN5700 with LCD part is LC420DUE-SCR1. At some point, I cracked the corner of the LCD. Rather than scrap the whole thing, I have been trolling and holding out for a donor screen. I have come across a 42LN5200 LCd part is LC420DUE-(SF)(R5).

The TCon board is identical between the two, but the LCD is not in the crossover list as an alternate. Anybody ever swap one of these out? What issues would there be?

[bcgrafx]

Re: Post The Led Backlights Your Fixing Here.

I have replaced several 42, 47 LG LN series. No shop, so I don't get a huge bunch coming in. I troll and salvage. Have done a few Visio as well.

[audiofreak19]

Re: Post The Led Backlights Your Fixing Here.

What's the biggest led strip or repair you have done? I have my eyes on a 60" and I have a 50" that needs to be done. I'm worried about breaking the screen to get to the leds when I lift the screen off. Any tips for removing the panel on very big tv's to get to the strips?

[dskall]

Re: Post The Led Backlights Your Fixing Here.

Each are different, but you need to change feedback resistors to led controller. That will permanently lower your max current. LG run over 400ma. I lower to around 300ma

[sordids999]

Re: Post The Led Backlights Your Fixing Here.

Thanks for the reply
Always update the firmware
What parts do you use to limit the current any tutorial ?
So are we saying you can leave the backlight on 100% after limiting the current ?

Thanks

[dskall]

Re: Post The Led Backlights Your Fixing Here.

Did you update firmware? Suppose to update firmware on LG to address led problem but I never found out what it actually does. I modify the board to limit current

[sordids999]

Re: Post The Led Backlights Your Fixing Here.

One question repaired a few LG leds but how do you set the tv backlights to for example 60%
Because everytime I turn on the tv it reverts back to 100%

Thanks

[Doc38343]

Re: Post The Led Backlights Your Fixing Here.

LG 50LN5100 Just started on this one. Confirmed it is a failure in the LED panel and not one of the boards.

[Charleyd]

Re: Post The Led Backlights Your Fixing Here.

I'll share my favorite tip regarding older LG TVs: With the back off, you can lay the TV face down, disconnect the two ribbon cables coming from the T-Con board, and remove all of the screws around the edge. Then use a bunch of toothpicks to hold the retaining clips around the edge open, and then lift the metal frame right off without disturbing the LCD panel (including the thin circuit board attached to the panel) and the diffusers. After taking care of the LEDS, just drop the back right down on top of the assemble and replace the screws.

[jbfr_54]

Re: Post The Led Backlights Your Fixing Here.

Hi all,
Fixed an Hitachi L42VP01C with 4 LED's failing.
Fixed an LG 32LN5400 with 5 LED's failing.
Have two more 32" LG to fix.
Using 400mA LEDs from Aliexpress so far so good.
Jean

[crt man]

Re: Post The Led Backlights Your Fixing Here.

I get around 5 or 6 at the moment coming through the workshop a week, over the last couple of months mostly LG.

I have done two of them, and don't know about
anyone else, but have found back light setting up full tilt

Alan.