This solution may possibly help fix nokia 5130 that has No LCD Display backlight LED and results to a dark screen displays.
If ever encountered this problem and then tried installing a new LCD screen module but still a dark screen display occurred and the backlight LED doesn't light up; This solution below shows the circuit components that holds the Nokia 5130 backlight LED.
You may check those corresponding components highlighted on the solution above.
Trace each particular line paths and check the supply voltage.
The LED driver chip when damaged will shutdown and all backlight LED's unable to light up including the keypad backlight LED's.So if both keypad and display backlight failed you may then suspect that the problem lies on the LED driver IC. But first, check the supply voltage and filter coils before attempting to replace it.