This solutions shows the location of particular components or spare parts on the PCB board layout that might get damaged and cause the device for unable to light up the LCD display backlight LED's including the keypad backlight LED.
Nokia 1800 and Nokia 1616 LCD display backlights circuit components layout
This also includes the line paths of each particular voltage and current that feeds to the backlight LED's of the LCD display module from the inner most part of the main ic component solder ball bumps for deep troubleshooting analysis.
Repair tips: check and have a continuity test on all filter coils and each lines paths from where it is being connected according to the picture's layout
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