If the newly installed LCD still shows the same problem, refer to the solution below and locate the highlighted components on the Samsung Galaxy S5 PCB motherboard. These components holds and control the Display LED backlights to work.
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Check/ replace the highlighted components such as the filter coil, diode and transistors. Check the voltage 1.8V across the inductor coil.
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Samsung Galaxy S5,LCD Display Light, Display Light Problem, Display Light Solution, Display Light Jumpers,
Samsung Galaxy S5 Display Light Ways, White Display, Blinking Display, Blank Display, Keypad Light