To determine the cause of the problem associated

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With the cable and button, you need to ring the elements using a tester , and the malfunction should be determined not only in the on state, but also in the off state.

The situation with the power supply is much more complicated - if during a visual inspection you notice damaged parts, this does not mean that by replacing them you will get properly working equipment. For example, capacitors may well swell from overvoltage, long-term use, or as a result of a secondary short circuit, the source of which is in a completely different circuit.

This is why it is necessary to test all elements of the power supply with a multimeter.They do this in the following sequence.

If the air conditioner has swollen, the thermistor has cracked, or any other visually detectable defect is noticeable, then you should carefully unsolder the part and clean it from electrolytes and carbon deposits.
The test is carried out starting with the fuse and the posistor, after uk telegram data which the diode bridge is rung, then the transistors, resistors and finally the microcircuit. If no interruptions are detected during the diagnostics, you just need to install working elements in place of the old ones.
The screen does not light up
If there is sound, but the panel does not light up , this may indicate a problem with the backlight circuit. There may be two reasons for this:

interruptions in the operation of lighting fixtures: LED or lamps;
lack of power supply to the backlight elements.
If you have an LCD TV, then the backlight is lamp-based; in all other models it is LED-based.

As a rule, any LCD TV has from 1 to 10 bulbs. It is very rare for all of them to burn out at once; most often, it is the lamp itself that is faulty.