LG 42LA620s - LED Strips Visible Through Matrix Despite Replacement, 6916L, L1/R1 & L2/R2 Issue

Hello, I came to repair the LG42LA620s TV with a backlight problem, namely each one diode is visible on the matrix after stripping the TV, it turned out that some master had previously improved the backlight, there were no supports that hold the filters up so I started to replace the LED strips.
After replacement, the effect is the same, when I replaced the 6916L I do not know whether this further marking is also important, but from what I read the mounted strips should work properly without a problem.

The only thing in place of the L1 and R1 slats I put L2 and R2 because I did not have the right ones, but could it be a problem that you can really see the whole slats on the screen? mainly on a light background.

All filters are in place and are not exchanged.
I have never seen such a thing, I don't have much experience but I have already repaired some of these highlights and I see this effect for the first time.
I am asking for help, what could be the reason for such a thing?

geryon wrote:

some master had improved the backlight earlier there were no supports that hold the filters up so I started to replace the LED strips.

geryon wrote:

After replacement, the effect is the same

which is another magician 6916L is like BN44 ...

Well, not another magician because what I noticed inside was a masterpiece I am surprised that someone like that repairs tv but not important.
I put the LED on
42 '' ROW2.1 REV 0.0 1 L1-TYPE 6916L-1385A
42 '' ROW2.1 REV 0.6 1 L1-TYPE 6916L-1214A

geryon wrote:

Well, not another magician

I don't know, you wrote:

geryon wrote:

what I noticed inside was a masterpiece I am surprised that someone like that repairs tv

and before :

geryon wrote:

so I started to replace the LED strips.
After replacement, the effect is the same

Maybe these strips are "resistant" ?

You can see the strips or where the LEDs are, you can see bright circles on the matrix, so this type is so new.

You can see "circles" - diodes. With all due respect, but it's not Thomism that it is so I can't imagine that such a thing may be acceptable to any user. Another issue is that of the same LG 39 "50" series or a model that has the same backlight has no such effect.

If someone noticed that it was shining he gave complaints and watched if he didn't pay attention. It was a bit on the net as people complained about the circles glowing against the dark background.

https://www.elektroda.pl/rtvforum/topic3031593.html

ok, but I am 99% sure that it did not look like this before replacing the strips - in the post you sent me there is a transistor responsible for it, my suspicion falls on him. In this model there is no separate electronics that controls it, everything goes from the power supply so I have to look for the fault on it probably.

Interesting ... there are 5 lines of 10 diodes in two chains? what is your led supply voltage?


Added after 1 [minutes]:

What power supply?

geryon wrote:

ok, but I'm 99% sure it didn't look like this before replacing the slats

Meanwhile

geryon wrote:

Hello, I came to repair the LG42LA620s TV with a backlight problem, namely each one diode is visible on the matrix after stripping the TV, it turned out that some master had previously improved the backlight, there were no supports that hold the filters up so I started to replace the LED strips.
After replacement, the effect is the same

So at what point do you miss the truth?

Because the topic starts to annoy me a little. Soon we will reach the other side, and neither the power supply model, nor the matrix, nor the versions of the original strips, nor voltages or currents! Zero. Null.
A topic for discussion in the Sandbox.

geryon wrote:

The only thing in place of the L1 and R1 slats I put L2 and R2 because I did not have the right ones, but could it be a problem that you can really see the whole slats on the screen? mainly on a light background.

So such?

To put it mildly, guerillas, but it has absolutely no effect on the effect, only a different spacing.

Added after 33 [minutes]:

geryon wrote:

what I noticed inside was a masterpiece

masterpieces you haven't seen yet,

I used to have such a case. Someone previously repaired and took 2 polarizing films and scattering light from the rear LED backlight and round bright circles were also slightly visible. Because I had similar films from another LCD TV, I installed them and applied transparent plastic spacers, e.g. from a shrink tube, to a height about 3 mm. from the original props. The effect of the visible circles radically diminished and was acceptable and almost invisible on a white background.