In this case, TV repairs are performed as follows :

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Open the case;
carefully remove all driver boards, as well as the power supply;
disassemble the screen module, for this remove both covers, if any, as well as the protective film;
inspect the LED strip or bulbs and replace them if necessary;
The rest of the target is checked visually and then with a tester - this will make sure that there are no breaks in the diode strip.
A more detailed overview of replacing faulty lamps using a Sharp LCD TV as an example is presented in the following video:



If all the lights do not light up at once, then with a high degree uk telegram data of probability the problem comes down to the backlight power supply. As a rule, high-voltage converters are used in liquid crystal and plasma technology. A malfunction in their start-up circuits can be easily determined with a multimeter. To do this, you need to measure the voltage on the blades in precise comparison with the working circuit. As soon as you find discrepancies, you can replace the elements with serviceable ones.

But it will be much more difficult to verify the transformer’s functionality .To do this, you need to measure the voltage on all the microelements of the converter. If the parameters are normal in each, then the transformer is to blame. If you want, you can rewind it again, but this is a very troublesome task. And the quality of such winding leaves much to be desired - sooner or later, the equipment will fail again. The best option would be to buy a new one.
In LED backlight transformers, the potential difference is usually between 50 and 100 W. If it is missing on the connectors, you should check how many volts go to the old transformer. To do this, you must first remove it. If the parameters are normal, the transformer should be replaced, and if not, then you should continue checking the remaining parts of the converter.