Often the reason for the breakdown of modern LCD TV isLED lighting in the backlight. The reason for this is initially illumination of the light, because of this, the service life of the LEDs decreases, and after 4-6 (and maybe earlier, depends on the operation) years, the TV just stops working (not all TVs of course)).
In this review, I will show how to replace the entire backlight entirely.
In this TV picture is, but there is no backlight.
Total is 5 years from the date of production.
We understand. Remove the cover.
We remove all the boards, disconnect the cables from the matrix.
In this model, the frame is held on snaps. Remove it.
Now unscrew the screws that hold the metal strips that hold the matrix.
We remove the slats. We pull out from the grooves 2 boards, which are connected by loops to the matrix. Neatly! (photo forgot to do)
Now you need to remove the chassis, which is the backlight.
Here are 2 options - either remove the matrix, thenframe, or gently snap off the latch and not touching the matrix to raise the chassis. I chose option 2. A little patience, accuracy - ready. When you snap the latches - it is important not to pull the chassis up after releasing the latches - the frame may move and there is a risk of killing the matrix, watch this. You need to release the next one, and so on in a circle. In the corners, I put the cards in, so that the back would not slam under weight.
Remove the white film.
Here are the bars themselves with LEDs. At this stage, you can replace only the burnt out LED. To do this, you need to identify the problem bar - we serve 15-18 volts (with current limitation of course) through the laboratory. I do not have it yet, so I used a bp from an inkjet printer (16 volt 375 ma). I did not work the bottom bracket.
Next, remove the lens and check each LEDWith a multimeter (they are three-volt, for 6 volt I used 2 cr2032 batteries connected in series). I only burned 1 pc, I replaced it (there is a donor), and the backlight began to work.
But I do not advise you to do this - other LEDs can also burn here - and then disassemble, solder (as I did for the first time on another TV) ... Well, the lenses also sit unevenly - we get light.
In general - peel off strips, degrease the surface, sticking new (adhesive tape is already glued)
Putting it all back, turn it on. Everything works, there is no light. We also reduce the backlight to 70%, to increase the service life.
Thus we get a working TV, buying a new one is canceled!)
Thank you all for your attention!