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Editando passo 10 —

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I analyzed original backlight connections and it's apparent why it fails: Chinese comrades who designed the display wanted to save some money and/or space and connected the LEDs in parallel.

Of course, every LED has slightly different threshold voltage. As a consequence, one of them draws more current and fails (burns open) prematurely. The remaining two LEDs are then subjected to even higher currents and burn soon afterwards, too.

Thus I decided to change the connection according to the lower schematic - I shorted the original 22R resistors and put a 220R resistor in series with each new LED.

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