Hello colleagues: I received an LG 42LB5600 with black screen and with sound, and everything else well .. practically new and with a little more than 1 year of use according to the client. When proceeding to disarm to check the LED strips I find 4 burned LEDs, which were the causes that did not turn on the blanking. Once they were changed, each 8 LED strip accused me of 41 volts in all. The changed LEDs were 6 volts, with the voltage at the anode and inverted cathode with respect to those I knew.The LEDs used had the same performance as the others and the voltage that came to them from the source was correct as indicated in the plate. THE PROBLEM I find the 4 8 of the loose lenses, which caught my attention. These lenses have only 3 tips that support the 3 tips of the flex, I proceeded to join some test with cyano gel, but did not peel off, then using Star 922 paste by gluing only the three aligned points, apparently they were well glued. While I did not take note of the separation that each had with the base of the flex. After assembling and placing the two filters that has only and the screen assemble everything. The points of the LEDs are marked slightly on the screen in most of the LEDs. in some screen changes I will appreciate if any colleague had a similar problem can give me your opinion about it. Best regards Julio Gramont

Another thing that could happen to you is that you had not placed, the filters in the position they were coming, they all have faces, and it should be left exactly the same, even, the white and rigid reflector has a face .... greetings.

Hello colleagues : Regarding the problem of the appearance of white dots on the screen, I record that I disarmed the TV again. LG42LB5600 Check the following as stated by colleagues. I comment in case someone can serve In my opinion, the filters were well placed, there are tabs that prevent them from being turned upside down. The thickest with the roughness towards the led. . The next transparent by placing a pencil behind it is seen on the right The transparent one that continues to place a pencil behind it is seen on the left and the first one behind the screen is opaque, smooth part towards the LEDs. The LEDs were all in place. I didn't like the HEATSINK PLASTER glue when I checked them gently some of them took off In this regard I will use the resin advised by the colleague from now on. The colleague told me to place the LEDs with the strip on is correct in this LG. where it is almost impossible to match the three points of the lens to the base a slight error, goes from a dim light to a powerful light .. In the first test, when disarming, I got my attention because I had LEDs that looked very powerful and much less through the lens, they were the ones that were marked as white dots, It was my mistake to paste them somewhat displaced and without controlling their brightness with the lens on. I think that was the reason. However, I am trying to modify in the best way the related source so that the LEDs are not burned, very common in this type of LG. I never had this problem when changing 3-volt led and in a month 2 LG with 6-volt led has the same thing happened to me. Regards Julio Gramont