Here's the Solution for Sony Ericsson Xperia X1 solution for not working display backlight problem that result to a dark or blank screen display. This solution shows some components that holds the display backlight LED to work or light up.
This solution may only work and can be applied if after replacing the LCD the problem still exists, so do replace the LCD first to confirm if the LCD backlight LED are still working or already damaged.
If the newly installed LCD still shows same display problem, you may then do a check up and replacement procedure on the components showed on the solution above. You may then check or replace the inductor coils and the diode, there is voltage supply reading on the inductor coil from the battery which is about 3.8V.
Then replace the LED driver IC if the components were all okay and if the problem still persists.
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