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crwdns2933797:0Pavel Hanakcrwdnd2933797:0crwdne2933797:0

crwdns2936043:0crwdne2936043:0 crwdns2933505:0crwdne2933505:0 Pavel Hanak

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[title] Backlight schematics
[* black] I analyzed original backlight connections and it's apparent why it fails: the Chinese comrades who designed the display wanted to save some money and/or space and connected the LEDs in parallel.
-[* black] Of course, the LEDs always have a slightly different threshold voltages. As consequence, one of them draws more current and it will fail (burn open) prematurely. Even higher current then flows through the remaining two LEDs and they burn soon afterwards.
+[* black] Of course, every LED has slightly different threshold voltage. As a consequence, one of them draws more current and it will fail (burn open) prematurely. Even higher current then flows through the remaining two LEDs and they burn soon afterwards.
[* black] 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.