Does anyone know what LEDs an LG 55LM5400 uses?

[Diah]

Re: Does anyone know what LEDs an LG 55LN5400 uses?

Unfortunately, I've already taken things apart again. Do I need to test the voltage with the TV on?

forget it if you taken them out from the tv. led tester reading are always different from power boards fixed currents.

[Daveleone]

Re: Does anyone know what LEDs an LG 55LN5400 uses?

forget it if you taken them out from the tv. led tester reading are always different from power boards fixed currents.

Ok, I haven't taken them out of the TV yet, but I did take the panel apart again. I'll try powering it on later and taking the readings directly.

[Diah]

Re: Does anyone know what LEDs an LG 55LN5400 uses?

Ok, I haven't taken them out of the TV yet, but I did take the panel apart again. I'll try powering it on later and taking the readings directly.

then u can turn on with out lcd and read them direct on powerboards socket

[Daveleone]

Re: Does anyone know what LEDs an LG 55LN5400 uses?

then u can turn on with out lcd and read them direct on powerboards socket

3 full A-B strips (36 old LEDs): 78.9v = 2.1917v per LED (~2.2v per LED)
4 full A-B strips (42 old LEDs + 6 new LEDs): 110.0v
So, 6 new LEDs = 110v - (42*2.1917v) = 17.95v = ~3v per LED

[Diah]

Re: Does anyone know what LEDs an LG 55LN5400 uses?

3 full A-B strips (36 old LEDs): 78.9v = 2.1917v per LED (~2.2v per LED)
4 full A-B strips (42 old LEDs + 6 new LEDs): 110.0v
So, 6 new LEDs = 110v - (42*2.1917v) = 17.95v = ~3v per LED

are you sure from the wiring.. it make no sense to me if the power boards had 2 channel LED per yours wiring 36 LED + 48LED, at least it should 42 LED each.

can you show clear photo on yours powerboards at the LED Sockets from both side please.

[Daveleone]

Re: Does anyone know what LEDs an LG 55LN5400 uses?

can you show clear photo on yours powerboards at the LED Sockets from both side please.

The wiring goes from end to end of the LED strips up the chain (in series) with a terminator at the end of each of the 2 the chains. 1 chain is 4 A-B strips, the other chain is 3 A-B strips.

The blue/white pair of wires powers the 3 strip chain, while the blue/black pair of wires powers the 4 strip chain.

[budm]

Re: Does anyone know what LEDs an LG 55LM5400 uses?

You LCD panel does not use the same amount of LED for each LED string, if you look at the Voltage chart and the Voltage rating of the filter caps for the two boost converter circuits you will see the two LED drive Voltages for the Low LED string and High LED string, thus different LED drive Voltages.
Pictures provided by shopjimmy.
LG EAY62810701 (3PAGC10124A-R) Power Supply / LED Board
https://www.shopjimmy.com/lg-eay6281...ply-led-board/

[Daveleone]

Re: Does anyone know what LEDs an LG 55LM5400 uses?

Just to close this thread out, I got the replacement original LED strip and everything works great. No hot spots. Case closed.

[budm]

Re: Does anyone know what LEDs an LG 55LM5400 uses?

Just to close this thread out, I got the replacement original LED strip and everything works great. No hot spots. Case closed.

Thanks for the follow-up.
So where did you get the correct replacement strips from so in the future people will know where to get them?

[Daveleone]

Re: Does anyone know what LEDs an LG 55LM5400 uses?

Thanks for the follow-up.
So where did you get the correct replacement strips from so in the future people will know where to get them?

I ended up buying the exact replacement strip for mine, by part number (LZ5501LGEPWA-DL84-R-REV.0) off of eBay, instead of using the "updated" POLA2.0 parts. Found a guy selling the A-side strips for $21.99 or best offer w/free shipping. I offered him $10 for one and he accepted.

[sam_sam_sam]

Re: Does anyone know what LEDs an LG 55LM5400 uses?

Let me ask a stupid question but why can you not use the original diffuser that were on the led strips and see how that would work on the replacement led strips

I realize that this might be some work but would be justifiable to do that

[Daveleone]

Re: Does anyone know what LEDs an LG 55LM5400 uses?

Let me ask a stupid question but why can you not use the original diffuser that were on the led strips and see how that would work on the replacement led strips

I realize that this might be some work but would be justifiable to do that

Actually, I did try that with one strip (see post #17 and #18). It didn't work because the LEDs themselves that are used in POLA2.0 are brighter (Diah explained this in post #16) and still created a hot spot even with the wider diffusion pattern. The 55LN5400 just doesn't have adequate diffusion layers to diffuse the brighter LEDs used in POLA2.0.

[sam_sam_sam]

Re: Does anyone know what LEDs an LG 55LM5400 uses?

Actually, I did try that with one strip (see post #17 and #18). It didn't work because the LEDs themselves that are used in POLA2.0 are brighter (Diah explained this in post #16) and still created a hot spot even with the wider diffusion pattern. The 55LN5400 just doesn't have adequate diffusion layers to diffuse the brighter LEDs used in POLA2.0.

I must have missed this part sorry about that

[Lee M.]

Re: Does anyone know what LEDs an LG 55LM5400 uses?

My set is a 55LN5710 and after replacing the LEDs with the POLA2.0 strips it looks exactly like the pics in post #10 of this thread. The problem is the light from the POLA2.0 strips is more concentrated than the OEM strips. This set has 3 diffuser sheets, and I think adding another translucent silver/grey sheet would fix this problem. Anybody know of a source for these diffuser sheets?

[captainKKK]

Re: Does anyone know what LEDs an LG 55LM5400 uses?

OMG, Now I know I was very lucky on my set of replacement strips for my INSIGNIA 50 TV NS 50DR710NA17. I looked closely at Shop Jimmy's replacement package and used those serials to find mine on Aliexpress. This is when I realized that Shop Jimmy has half of the strip numbers WRONG in the title of their out of stock package. I ordered from Aliexpress before I even broke down my unit to actually see the strips that mine actually used . Wow you had a complete nightmare and I would have chucked the whole thing. Kudos for your tenacity.

[alfatv]

Re: Does anyone know what LEDs an LG 55LM5400 uses?

I've ordered several LB style strips with big lenses from aliexpress and all of them had problem with light uniformity. Sometimes you can find more expensive "originals" but I haven't tried those.
I did get once a really good result with real originals from broken screen TV.
BTW, LED brightness has nothing to do with light uniformity, but it's still a good idea to lower it to prolong life of LEDs.

[alfatv]

Re: Does anyone know what LEDs an LG 55LM5400 uses?

My set is a 55LN5710 and after replacing the LEDs with the POLA2.0 strips it looks exactly like the pics in post #10 of this thread. The problem is the light from the POLA2.0 strips is more concentrated than the OEM strips. This set has 3 diffuser sheets, and I think adding another translucent silver/grey sheet would fix this problem. Anybody know of a source for these diffuser sheets?

If it's really annoying, you can try a layer of matte shower curtain or plastic mattress box cover from Dollar Tree.

[Daveleone]

Re: Does anyone know what LEDs an LG 55LM5400 uses?

OMG, Now I know I was very lucky on my set of replacement strips for my INSIGNIA

Yeah, not to mention, both the seller and Alibaba disagreed with me that those LED strips were unusable on my TV and refused to provide a refund. So that was $35 down the drain. At least I got the TV fixed in the end.

[Lee M.]

Re: Does anyone know what LEDs an LG 55LM5400 uses?

Glad to hear ur set is still working with the OEM LED's. My set had 2 bad LED's on different strips. I called a couple of shops to see if they might have a cracked screen set and would sell me a couple of strips. They said don't waste ur time just replacing one or two strips as the rest will fail and the repair won't last, the OEM LED's are crap and the replacement LED's aren't much better. They said the only way the repair might last for a while is to get the kit and replace all the strips, do a firmware update which turns down the BL, and run the BL at 80% or less. So I did all that and the set is "working" but if u pull white screen u can see a bright spot for each LED just like in the pics in post #10. When watching normal programming I guess it's not too bad. I probably notice it more since I'm looking for it.