This is the Lg G3 D855 hardware solution for display LED lights failure problem that shows a dark or black screen display.
In troubleshooting this problem you may need to try to replace Lg D855 LCD screen first to easily confirm if the LED light bulb is already damaged or not. If the said newly installed LCD still shows a dark screen display and the LED failed to light up, this solution below will show us the next step to proceed in fixing this problem.
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Now Check Continuity between Display connector to the resistor compounds. if any of then is track missing then make a jumper.
If the above procedures doesn’t fix the problem the possible faulty is the main engine IC. Try to re-heat or rework it.
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